Merge branch 'main' into node24

Co-authored-by: GitHub Actions <github-actions@github.com>

.github/workflows/buildtest.yml

@@ -12,18 +12,55 @@ jobs:
   build:
     runs-on: ubuntu-latest
 
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x, 22.x]
+
     steps:
     - uses: actions/checkout@v4
-    - name: Use Node.js 16.15
+    - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v4
       with:
-        node-version: 16.15
+        node-version: ${{ matrix.node-version }}
         cache: 'npm'
         registry-url: 'https://npm.pkg.github.com'
-    - run: npm ci
+    - run: npm ci --engine-strict
       env:
         NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     - run: npm run format-check -ws
     - run: npm run build -ws
     - run: npm run lint -ws
     - run: npm test -ws
+
+  check-generated:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Use Node.js 22.x
+      uses: actions/setup-node@v4
+      with:
+        node-version: 22.x
+        cache: 'npm'
+        registry-url: 'https://npm.pkg.github.com'
+    - run: npm ci
+      env:
+        NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    - name: Regenerate JSON files
+      run: |
+        cd languageservice && npm run update-webhooks && cd ..
+    - name: Check for uncommitted changes
+      run: |
+        if ! git diff --exit-code; then
+          echo ""
+          echo "=========================================="
+          echo "ERROR: Generated files are out of date!"
+          echo "=========================================="
+          echo ""
+          echo "Please run the following commands locally and commit the changes:"
+          echo ""
+          echo "  cd languageservice && npm run update-webhooks && cd .."
+          echo "  git add -A && git commit -m 'Regenerate JSON files'"
+          echo ""
+          exit 1
+        fi

.github/workflows/release.yml

@@ -69,7 +69,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: 16.x
+          node-version: 22.x
           cache: "npm"
           scope: '@actions'
 

.gitignore

@@ -2,4 +2,12 @@
 */dist
 lerna-debug.log
 node_modules
-.DS_Store
+.DS_Store
+
+# Minified JSON (generated at build time)
+*.min.json
+
+# Intermediate JSON for size comparison (generated by update-webhooks --all)
+*.all.json
+*.drop.json
+*.strip.json

README.md

@@ -8,6 +8,10 @@ This repository contains multiple npm packages for working with GitHub Actions w
 - [languageserver](./languageserver) - Language Server for GitHub Actions, hosting the language service for LSP-compatible editors
 - [browser-playground](./browser-playground) - Browser-based playground for the language service
 
+## Documentation
+
+- [JSON Data Files](./docs/json-data-files.md) - How the JSON data files are generated and maintained
+
 ### Note
 
 Thank you for your interest in this GitHub repo, however, right now we are not taking contributions. 

docs/json-data-files.md

@@ -0,0 +1,197 @@
+# JSON Data Files
+
+This document describes the JSON data files used by the language service packages and how they are maintained.
+
+## Overview
+
+The language service uses several JSON files containing schema definitions, webhook payloads, and other metadata. To reduce bundle size, these files are:
+
+1. **Optimized at generation time** — unused events are dropped, unused fields are stripped
+2. **Minified at build time** — whitespace is removed to produce `.min.json` files
+
+The source `.json` files are human-readable and checked into the repository. The `.min.json` files are generated during build and gitignored.
+
+## Files
+
+### languageservice
+
+| File | Description |
+|------|-------------|
+| `src/context-providers/events/webhooks.json` | Webhook event payload schemas for autocompletion |
+| `src/context-providers/events/objects.json` | Deduplicated shared object definitions referenced by webhooks |
+| `src/context-providers/events/schedule.json` | Schedule event context data |
+| `src/context-providers/events/workflow_call.json` | Reusable workflow call context data |
+| `src/context-providers/descriptions.json` | Context variable descriptions for hover |
+
+### workflow-parser
+
+| File | Description |
+|------|-------------|
+| `src/workflow-v1.0.json` | Workflow YAML schema definition |
+
+## Generation
+
+### Webhooks and Objects
+
+The `webhooks.json` and `objects.json` files are generated from the [GitHub REST API description](https://github.com/github/rest-api-description):
+
+```bash
+cd languageservice
+npm run update-webhooks
+```
+
+This script:
+1. Fetches webhook schemas from the GitHub API description
+2. **Validates** all events are categorized (fails if new events are found)
+3. **Drops** events that aren't valid workflow triggers (see [Dropped Events](#dropped-events))
+4. **Strips** unused fields like `description` and `summary` (see [Stripped Fields](#stripped-fields))
+5. **Deduplicates** shared object definitions into `objects.json`
+6. Writes the optimized, pretty-printed JSON files
+
+### Handling New Webhook Events
+
+When GitHub adds a new webhook event, the script will fail with an error like:
+
+```
+ERROR: New webhook event(s) detected!
+
+The following events are not categorized:
+  - new_event_name
+
+Action required:
+  1. Check if the event is a valid workflow trigger
+  2. Add the event to DROPPED_EVENTS or KEPT_EVENTS
+```
+
+**To resolve:**
+
+1. Check [Events that trigger workflows](https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows)
+
+2. Edit `languageservice/script/webhooks/index.ts`:
+   - Add to `KEPT_EVENTS` if it's a valid workflow trigger
+   - Add to `DROPPED_EVENTS` if it's GitHub App or API-only
+
+3. Run `npm run update-webhooks` and commit the changes
+
+#### Viewing Full Unprocessed Data
+
+To see all available fields and events before optimization:
+
+```bash
+npm run update-webhooks -- --all
+```
+
+This generates `webhooks.all.json` and `objects.all.json` (gitignored) containing the complete unprocessed data from the GitHub API.
+
+### Other Files
+
+The other JSON files (`schedule.json`, `workflow_call.json`, `descriptions.json`, `workflow-v1.0.json`) are manually maintained.
+
+## Minification
+
+At build time, all JSON files are minified (whitespace removed) to produce `.min.json` versions:
+
+```bash
+npm run minify-json
+```
+
+This runs automatically via `prebuild` and `pretest` hooks, so you don't need to run it manually.
+
+The code imports the minified versions:
+
+```ts
+import webhooks from "./events/webhooks.min.json"
+```
+
+## CI Verification
+
+CI verifies that generated source files are up-to-date:
+
+1. Runs `npm run update-webhooks` to regenerate webhooks.json and objects.json
+2. Checks for uncommitted changes with `git diff --exit-code`
+
+The `.min.json` files are generated at build time and are not committed to the repository.
+
+If the build fails, run `cd languageservice && npm run update-webhooks` locally and commit the changes.
+
+## Dropped Events
+
+Webhook events that aren't valid workflow `on:` triggers are dropped (e.g., `installation`, `ping`, `member`, etc.). These are GitHub App or API-only events.
+
+See `DROPPED_EVENTS` in `script/webhooks/index.ts` for the full list.
+
+## Stripped Fields
+
+Unused fields are stripped to reduce bundle size. For example:
+
+```json
+// Before (from webhooks.all.json)
+{
+  "type": "object",
+  "name": "issue",
+  "in": "body",
+  "description": "The issue itself.",
+  "isRequired": true,
+  "childParamsGroups": [...]
+}
+
+// After (webhooks.json)
+{
+  "name": "issue",
+  "description": "The issue itself.",
+  "childParamsGroups": [...]
+}
+```
+
+Only `name`, `description`, and `childParamsGroups` are kept — these are used for autocompletion and hover docs.
+
+To compare all fields vs stripped, run `npm run update-webhooks -- --all` and diff the `.all.json` files against the regular ones.
+
+See `EVENT_ACTION_FIELDS` and `BODY_PARAM_FIELDS` in `script/webhooks/index.ts` to modify what gets stripped.
+
+## Schema Synchronization
+
+The `workflow-v1.0.json` schema defines which activity types are valid for each workflow trigger event. A test in `workflow-parser/src/schema-sync.test.ts` verifies these stay in sync with `webhooks.json`.
+
+### When the Test Fails
+
+If the schema-sync test fails, you'll see an error like:
+
+```
+Event "pull_request" is missing activity type "new_activity" in workflow-v1.0.json
+```
+
+**To resolve:**
+
+1. Check [Events that trigger workflows](https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows) to verify the activity type is a valid workflow trigger:
+   - Find the event section (e.g., "pull_request")
+   - Look at the "Activity types" table — it lists which types can be used in `on.<event>.types`
+   - If the type is listed there, it's a valid workflow trigger
+   - If the type only appears in webhook docs but NOT in the workflow trigger docs, it's webhook-only
+
+2. If it IS a valid workflow trigger:
+   - Edit `workflow-parser/src/workflow-v1.0.json`
+   - Find the `<event>-activity-type` definition (e.g., `pull-request-activity-type`)
+   - Add the new activity type to `allowed-values`
+   - Update the `description` in `<event>-activity` to list all types
+   - Run `npm test` to regenerate the minified JSON
+
+3. If it is NOT a valid workflow trigger (webhook-only):
+   - Edit `workflow-parser/src/schema-sync.test.ts`
+   - Add the type to `WEBHOOK_ONLY` for that event
+
+### Known Discrepancies
+
+The test tracks several types of known discrepancies:
+
+| Category | Purpose | Example |
+|----------|---------|---------|
+| `WEBHOOK_ONLY` | Types in webhooks that aren't valid workflow triggers | `check_suite.requested` |
+| `SCHEMA_ONLY` | Types valid for workflows but missing from webhooks | `registry_package.updated` |
+| `NAME_MAPPINGS` | Different names for the same concept | `project_column`: webhook uses `edited`, schema uses `updated` |
+
+### Bidirectional Checking
+
+The test checks both directions:
+- **webhooks → schema**: Ensures all webhook activity types are in the schema (or listed in `WEBHOOK_ONLY`)
+- **schema → webhooks**: Ensures the schema doesn't have types that don't exist in webhooks (or listed in `SCHEMA_ONLY` or `NAME_MAPPINGS`)

expressions/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@actions/expressions",
-  "version": "0.3.20",
+  "version": "0.3.25",
   "license": "MIT",
   "type": "module",
   "source": "./src/index.ts",
@@ -44,7 +44,7 @@
     "watch": "tsc --build tsconfig.build.json --watch"
   },
   "engines": {
-    "node": ">= 16.15"
+    "node": ">= 18"
   },
   "files": [
     "dist/**/*"

languageserver/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@actions/languageserver",
-  "version": "0.3.20",
+  "version": "0.3.25",
   "description": "Language server for GitHub Actions",
   "license": "MIT",
   "type": "module",
@@ -43,8 +43,8 @@
     "watch": "tsc --build tsconfig.build.json --watch"
   },
   "dependencies": {
-    "@actions/languageservice": "^0.3.20",
+    "@actions/languageservice": "^0.3.25",
-    "@actions/workflow-parser": "^0.3.20",
+    "@actions/workflow-parser": "^0.3.25",
     "@octokit/rest": "^21.1.1",
     "@octokit/types": "^9.0.0",
     "vscode-languageserver": "^8.0.2",
@@ -52,7 +52,7 @@
     "yaml": "^2.1.3"
   },
   "engines": {
-    "node": ">= 16.15"
+    "node": ">= 18"
   },
   "files": [
     "dist/**/*"

languageserver/src/context-providers.test.ts

@@ -0,0 +1,76 @@
+import {data, DescriptionDictionary} from "@actions/expressions";
+import {WorkflowContext} from "@actions/languageservice/context/workflow-context";
+import {Mode} from "@actions/languageservice/context-providers/default";
+import {contextProviders} from "./context-providers";
+import {RepositoryContext} from "./initializationOptions";
+import {TTLCache} from "./utils/cache";
+
+describe("contextProviders", () => {
+  const mockCache = new TTLCache();
+  const mockRepo: RepositoryContext = {
+    id: 123,
+    owner: "test-owner",
+    name: "test-repo",
+    organizationOwned: true,
+    workspaceUri: "file:///workspace"
+  };
+  const mockWorkflowContext: WorkflowContext = {
+    uri: "test.yaml",
+    template: undefined
+  };
+
+  describe("when client is undefined", () => {
+    it("should return incomplete context for secrets", async () => {
+      const config = contextProviders(undefined, mockRepo, mockCache);
+      const result = await config.getContext("secrets", undefined, mockWorkflowContext, Mode.Validation);
+
+      expect(result).toBeInstanceOf(DescriptionDictionary);
+      expect((result as DescriptionDictionary).complete).toBe(false);
+    });
+
+    it("should return incomplete context for vars", async () => {
+      const config = contextProviders(undefined, mockRepo, mockCache);
+      const result = await config.getContext("vars", undefined, mockWorkflowContext, Mode.Validation);
+
+      expect(result).toBeInstanceOf(DescriptionDictionary);
+      expect((result as DescriptionDictionary).complete).toBe(false);
+    });
+
+    it("should preserve defaultContext and mark as incomplete for secrets", async () => {
+      const config = contextProviders(undefined, mockRepo, mockCache);
+      const defaultContext = new DescriptionDictionary();
+      defaultContext.add("EXISTING_SECRET", new data.StringData("test"));
+
+      const result = await config.getContext("secrets", defaultContext, mockWorkflowContext, Mode.Validation);
+
+      expect(result).toBe(defaultContext);
+      expect((result as DescriptionDictionary).complete).toBe(false);
+      expect((result as DescriptionDictionary).get("EXISTING_SECRET")).toBeDefined();
+    });
+
+    it("should return undefined for other contexts like steps", async () => {
+      const config = contextProviders(undefined, mockRepo, mockCache);
+      const result = await config.getContext("steps", undefined, mockWorkflowContext, Mode.Validation);
+
+      expect(result).toBeUndefined();
+    });
+  });
+
+  describe("when both client and repo are undefined", () => {
+    it("should return incomplete context for secrets", async () => {
+      const config = contextProviders(undefined, undefined, mockCache);
+      const result = await config.getContext("secrets", undefined, mockWorkflowContext, Mode.Validation);
+
+      expect(result).toBeInstanceOf(DescriptionDictionary);
+      expect((result as DescriptionDictionary).complete).toBe(false);
+    });
+
+    it("should return incomplete context for vars", async () => {
+      const config = contextProviders(undefined, undefined, mockCache);
+      const result = await config.getContext("vars", undefined, mockWorkflowContext, Mode.Validation);
+
+      expect(result).toBeInstanceOf(DescriptionDictionary);
+      expect((result as DescriptionDictionary).complete).toBe(false);
+    });
+  });
+});

languageserver/src/context-providers.ts

@@ -15,7 +15,18 @@ export function contextProviders(
   cache: TTLCache
 ): ContextProviderConfig {
   if (!repo || !client) {
-    return {getContext: () => Promise.resolve(undefined)};
+    // When GitHub client/repo is unavailable, return an incomplete dictionary
+    // to avoid false "Context access might be invalid" warnings
+    return {
+      getContext: (name: string, defaultContext: DescriptionDictionary | undefined) => {
+        if (name === "secrets" || name === "vars") {
+          const context = defaultContext || new DescriptionDictionary();
+          context.complete = false;
+          return Promise.resolve(context);
+        }
+        return Promise.resolve(undefined);
+      }
+    };
   }
 
   const getContext = async (

languageserver/src/context-providers/secrets.ts

@@ -49,7 +49,7 @@ export async function getSecrets(
           if (isString(x.value)) {
             environmentName = x.value.value;
           } else {
-            // this means we have a dynamic enviornment, in those situations we
+            // this means we have a dynamic environment, in those situations we
             // want to make sure we skip doing secret validation
             secretsContext.complete = false;
           }

languageserver/src/context-providers/steps.test.ts

@@ -1,4 +1,4 @@
-import {data, DescriptionDictionary} from "@actions/expressions";
+import {data, DescriptionDictionary, isDescriptionDictionary} from "@actions/expressions";
 import {getStepsContext as getDefaultStepsContext} from "@actions/languageservice/context-providers/steps";
 import {Octokit} from "@octokit/rest";
 import fetchMock from "fetch-mock";
@@ -63,6 +63,43 @@ it("returns default context when job is undefined", async () => {
   expect(stepsContext).toEqual(defaultContext);
 });
 
+it("outputs is an incomplete dictionary to allow dynamic outputs", async () => {
+  const mock = fetchMock
+    .sandbox()
+    .getOnce("https://api.github.com/repos/actions/cache/contents/action.yml?ref=v3", actionMetadata);
+
+  const workflowContext = await createWorkflowContext(workflow, "build");
+  const defaultContext = getDefaultStepsContext(workflowContext);
+
+  const stepsContext = await getStepsContext(
+    new Octokit({
+      request: {
+        fetch: mock
+      }
+    }),
+    new TTLCache(),
+    defaultContext,
+    workflowContext
+  );
+
+  // Get the step context
+  const stepContext = stepsContext?.get("cache-primes");
+  expect(stepContext).toBeDefined();
+  expect(isDescriptionDictionary(stepContext!)).toBe(true);
+
+  // Get the outputs - should be a dictionary, not null
+  const outputs = (stepContext as DescriptionDictionary).get("outputs");
+  expect(outputs).toBeDefined();
+  expect(isDescriptionDictionary(outputs!)).toBe(true);
+
+  // Outputs should be marked incomplete to allow dynamic outputs
+  const outputsDict = outputs as DescriptionDictionary;
+  expect(outputsDict.complete).toBe(false);
+
+  // Known outputs from action.yml should be present
+  expect(outputsDict.get("cache-hit")).toBeDefined();
+});
+
 it("adds action outputs", async () => {
   const mock = fetchMock
     .sandbox()
@@ -83,17 +120,22 @@ it("adds action outputs", async () => {
   );
   expect(stepsContext).toBeDefined();
 
+  // Create expected outputs dict with complete = false
+  // (actions can have dynamic outputs beyond what's declared in action.yml)
+  const expectedOutputs = new DescriptionDictionary({
+    key: "cache-hit",
+    value: new data.StringData("A boolean value to indicate an exact match was found for the primary key"),
+    description: "A boolean value to indicate an exact match was found for the primary key"
+  });
+  expectedOutputs.complete = false;
+
   expect(stepsContext).toEqual(
     new DescriptionDictionary({
       key: "cache-primes",
       value: new DescriptionDictionary(
         {
           key: "outputs",
-          value: new DescriptionDictionary({
+          value: expectedOutputs
-            key: "cache-hit",
-            value: new data.StringData("A boolean value to indicate an exact match was found for the primary key"),
-            description: "A boolean value to indicate an exact match was found for the primary key"
-          })
         },
         {
           key: "conclusion",

languageserver/src/context-providers/steps.ts

@@ -58,6 +58,8 @@ export async function getStepsContext(
             continue;
           }
           const outputsDict = new DescriptionDictionary();
+          // Actions can have dynamic outputs beyond what's declared in action.yml
+          outputsDict.complete = false;
           for (const [key, value] of Object.entries(outputs)) {
             outputsDict.add(key, new data.StringData(value.description), value.description);
           }

languageserver/src/context-providers/variables.ts

@@ -26,6 +26,8 @@ export async function getVariables(
     return secretsContext;
   }
 
+  const variablesContext = defaultContext || new DescriptionDictionary();
+
   let environmentName: string | undefined;
   if (workflowContext?.job?.environment) {
     if (isString(workflowContext.job.environment)) {
@@ -35,14 +37,19 @@ export async function getVariables(
         if (isString(x.key) && x.key.value === "name") {
           if (isString(x.value)) {
             environmentName = x.value.value;
+          } else {
+            // this means we have a dynamic environment, in those situations we want to skip validation
+            variablesContext.complete = false;
           }
           break;
         }
       }
+    } else {
+      // if the expression is something like environment: ${{ ... }} then we want to skip validation
+      variablesContext.complete = false;
     }
   }
 
-  const variablesContext = defaultContext || new DescriptionDictionary();
   try {
     const variables = await getRemoteVariables(octokit, cache, repo, environmentName);
 

languageserver/src/test-utils/action-metadata.ts

@@ -16,7 +16,7 @@ inputs:
     description: 'Repository name with owner. For example, actions/checkout'
     deprecationMessage: 'Use repository instead'
 runs:
-  using: node16
+  using: node24
   main: dist/index.js
   post: dist/index.js
 `;

languageserver/src/utils/action-metadata.test.ts

@@ -12,7 +12,7 @@ inputs:
     description: Repository name with owner. For example, actions/checkout
     default: \${{ github.repository }}
 runs:
-  using: node16
+  using: node24
   main: dist/index.js
   post: dist/index.js
 `;
@@ -231,7 +231,7 @@ inputs:
     description: 📦 Repository 📦 name with owner. For example, actions/checkout
     default: \${{ github.repository }}
 runs:
-  using: node16
+  using: node24
   main: dist/index.js
   post: dist/index.js
 `;

languageservice/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@actions/languageservice",
-  "version": "0.3.20",
+  "version": "0.3.25",
   "description": "Language service for GitHub Actions",
   "license": "MIT",
   "type": "module",
@@ -37,22 +37,25 @@
     "format-check": "prettier --check '**/*.ts'",
     "lint": "eslint 'src/**/*.ts'",
     "lint-fix": "eslint --fix 'src/**/*.ts'",
+    "minify-json": "node ../script/minify-json.js src/context-providers/descriptions.json src/context-providers/events/webhooks.json src/context-providers/events/objects.json src/context-providers/events/schedule.json src/context-providers/events/workflow_call.json",
+    "prebuild": "npm run minify-json",
     "prepublishOnly": "npm run build && npm run test",
+    "pretest": "npm run minify-json",
     "test": "NODE_OPTIONS=\"--experimental-vm-modules\" jest",
     "test-watch": "NODE_OPTIONS=\"--experimental-vm-modules\" jest --watch",
-    "update-webhooks": "ts-node-esm script/webhooks/index.ts",
+    "update-webhooks": "npx tsx script/webhooks/index.ts",
     "watch": "tsc --build tsconfig.build.json --watch"
   },
   "dependencies": {
-    "@actions/expressions": "^0.3.20",
+    "@actions/expressions": "^0.3.25",
-    "@actions/workflow-parser": "^0.3.20",
+    "@actions/workflow-parser": "^0.3.25",
     "vscode-languageserver-textdocument": "^1.0.7",
     "vscode-languageserver-types": "^3.17.2",
     "vscode-uri": "^3.0.8",
     "yaml": "^2.1.1"
   },
   "engines": {
-    "node": ">= 16.15"
+    "node": ">= 18"
   },
   "files": [
     "dist/**/*"

languageservice/script/webhooks/index.ts

@@ -7,6 +7,185 @@ const schema = schemaImport as any;
 
 const OUTPUT_PATH = "./src/context-providers/events/webhooks.json";
 const OBJECTS_PATH = "./src/context-providers/events/objects.json";
+const ALL_OUTPUT_PATH = "./src/context-providers/events/webhooks.all.json";
+const ALL_OBJECTS_PATH = "./src/context-providers/events/objects.all.json";
+const DROP_OUTPUT_PATH = "./src/context-providers/events/webhooks.drop.json";
+const DROP_OBJECTS_PATH = "./src/context-providers/events/objects.drop.json";
+const STRIP_OUTPUT_PATH = "./src/context-providers/events/webhooks.strip.json";
+const STRIP_OBJECTS_PATH = "./src/context-providers/events/objects.strip.json";
+
+// Parse --all flag
+const generateAll = process.argv.includes("--all");
+
+// Events to drop - not valid workflow triggers (GitHub App or API-only events)
+// See: https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows
+const DROPPED_EVENTS = new Set([
+  "branch_protection_configuration",
+  "code_scanning_alert",
+  "commit_comment",
+  "custom_property",
+  "custom_property_values",
+  "dependabot_alert",
+  "deploy_key",
+  "github_app_authorization",
+  "installation",
+  "installation_repositories",
+  "installation_target",
+  "marketplace_purchase",
+  "member",
+  "membership",
+  "merge_group",
+  "meta",
+  "org_block",
+  "organization",
+  "package",
+  "personal_access_token_request",
+  "ping",
+  "repository",
+  "repository_advisory",
+  "repository_ruleset",
+  "secret_scanning_alert",
+  "secret_scanning_alert_location",
+  "security_advisory",
+  "security_and_analysis",
+  "sponsorship",
+  "star",
+  "team",
+  "team_add"
+]);
+
+// Events to keep - valid workflow triggers
+// See: https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows
+const KEPT_EVENTS = new Set([
+  "branch_protection_rule",
+  "check_run",
+  "check_suite",
+  "create",
+  "delete",
+  "deployment",
+  "deployment_status",
+  "discussion",
+  "discussion_comment",
+  "fork",
+  "gollum",
+  "issue_comment",
+  "issues",
+  "label",
+  "milestone",
+  "page_build",
+  "project",
+  "project_card",
+  "project_column",
+  "projects_v2",
+  "projects_v2_item",
+  "public",
+  "pull_request",
+  "pull_request_review",
+  "pull_request_review_comment",
+  "pull_request_review_thread",
+  "push",
+  "registry_package",
+  "release",
+  "repository_dispatch",
+  "repository_import",
+  "repository_vulnerability_alert",
+  "status",
+  "watch",
+  "workflow_dispatch",
+  "workflow_job",
+  "workflow_run"
+]);
+
+/**
+ * Fields to strip from the JSON data.
+ *
+ * EVENT_ACTION_FIELDS: stripped from each event action object (top level only)
+ * Example event action object before stripping:
+ *   {
+ *     "description": "This event is triggered when...",  // <-- stripped
+ *     "summary": "A brief summary",                      // <-- stripped
+ *     "availability": ["repository"],                    // <-- stripped
+ *     "category": "issues",                              // <-- stripped
+ *     "action": "opened",                                // kept
+ *     "bodyParameters": [...]                            // kept
+ *   }
+ *
+ * BODY_PARAM_FIELDS: stripped from every bodyParameters object, recursively through childParamsGroups
+ * Example bodyParameter object before stripping:
+ *   {
+ *     "type": "object",                                  // <-- stripped
+ *     "name": "changes",                                 // kept (used for property names)
+ *     "in": "body",                                      // <-- stripped
+ *     "description": "The changes that were made.",      // kept (used for hover docs)
+ *     "isRequired": true,                                // <-- stripped
+ *     "enum": ["a", "b"],                                // <-- stripped
+ *     "default": "a",                                    // <-- stripped
+ *     "childParamsGroups": [                             // kept (used for nested properties)
+ *       {
+ *         "type": "string",                              // <-- stripped (recursive)
+ *         "name": "from",                                // kept
+ *         "isRequired": true                             // <-- stripped (recursive)
+ *       }
+ *     ]
+ *   }
+ */
+const EVENT_ACTION_FIELDS = ["description", "summary", "availability", "category"];
+const BODY_PARAM_FIELDS = ["type", "in", "isRequired", "enum", "default"];
+
+/**
+ * Strip fields from a bodyParameter object and recursively from childParamsGroups.
+ */
+function stripBodyParam(param: any): any {
+  if (typeof param !== "object" || param === null) {
+    return param;
+  }
+
+  const result: any = {};
+  for (const [key, value] of Object.entries(param)) {
+    if (BODY_PARAM_FIELDS.includes(key)) {
+      continue; // Strip this field
+    }
+    if (key === "childParamsGroups" && Array.isArray(value)) {
+      result[key] = value.map(stripBodyParam);
+    } else {
+      result[key] = value;
+    }
+  }
+  return result;
+}
+
+/**
+ * Strip unused fields from event action data.
+ */
+function stripEventActionFields(action: any): any {
+  const result: any = {};
+  for (const [key, value] of Object.entries(action)) {
+    if (EVENT_ACTION_FIELDS.includes(key)) {
+      continue; // Strip this field
+    }
+    if (key === "bodyParameters" && Array.isArray(value)) {
+      result[key] = value.map((p: any) => (typeof p === "number" ? p : stripBodyParam(p)));
+    } else {
+      result[key] = value;
+    }
+  }
+  return result;
+}
+
+/**
+ * Strip unused fields from all webhooks.
+ * Structure: { eventName: { actionName: { ...fields } } }
+ */
+function stripFields(webhooks: Record<string, Record<string, any>>): Record<string, Record<string, any>> {
+  const result: Record<string, Record<string, any>> = {};
+  for (const [eventName, actions] of Object.entries(webhooks)) {
+    result[eventName] = {};
+    for (const [actionName, actionData] of Object.entries(actions)) {
+      result[eventName][actionName] = stripEventActionFields(actionData);
+    }
+  }
+  return result;
+}
 
 const rawWebhooks = Object.values(schema.webhooks || schema["x-webhooks"]) as any[];
 if (!rawWebhooks) {
@@ -20,11 +199,51 @@ for (const webhook of Object.values(rawWebhooks)) {
 
 await Promise.all(webhooks.map(webhook => webhook.process()));
 
+// Check for unknown events (not in DROPPED_EVENTS or KEPT_EVENTS)
+const unknownEvents: string[] = [];
+for (const webhook of webhooks) {
+  if (!DROPPED_EVENTS.has(webhook.category) && !KEPT_EVENTS.has(webhook.category)) {
+    if (!unknownEvents.includes(webhook.category)) {
+      unknownEvents.push(webhook.category);
+    }
+  }
+}
+
+if (unknownEvents.length > 0) {
+  console.error("");
+  console.error("══════════════════════════════════════════════════════════════════");
+  console.error("ERROR: New webhook event(s) detected!");
+  console.error("══════════════════════════════════════════════════════════════════");
+  console.error("");
+  console.error("The following events are not categorized:");
+  for (const event of unknownEvents.sort()) {
+    console.error(`  - ${event}`);
+  }
+  console.error("");
+  console.error("Action required:");
+  console.error("  1. Check if the event is a valid workflow trigger:");
+  console.error(
+    "     https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows"
+  );
+  console.error("");
+  console.error("  2. Add the event to DROPPED_EVENTS or KEPT_EVENTS in:");
+  console.error("     languageservice/script/webhooks/index.ts");
+  console.error("");
+  console.error("  3. See docs/json-data-files.md for more details.");
+  console.error("");
+  process.exit(1);
+}
+
 // The category is the name of the webhook
 const categorizedWebhooks: Record<string, Record<string, Webhook>> = {};
 for (const webhook of webhooks) {
   if (!webhook.action) webhook.action = "default";
 
+  // Drop unused events
+  if (DROPPED_EVENTS.has(webhook.category)) {
+    continue;
+  }
+
   if (categorizedWebhooks[webhook.category]) {
     categorizedWebhooks[webhook.category][webhook.action] = webhook;
   } else {
@@ -33,7 +252,59 @@ for (const webhook of webhooks) {
   }
 }
 
-const objectsArray = deduplicateWebhooks(categorizedWebhooks);
+// Strip fields before deduplication
+const strippedWebhooks = stripFields(categorizedWebhooks);
 
+// Deduplicate after dropping and stripping
+const objectsArray = deduplicateWebhooks(strippedWebhooks);
+
+// Write optimized output
 await fs.writeFile(OBJECTS_PATH, JSON.stringify(objectsArray, null, 2));
-await fs.writeFile(OUTPUT_PATH, JSON.stringify(categorizedWebhooks, null, 2));
+await fs.writeFile(OUTPUT_PATH, JSON.stringify(strippedWebhooks, null, 2));
+
+console.log(`Wrote ${OUTPUT_PATH} (${Object.keys(strippedWebhooks).length} events)`);
+console.log(`Wrote ${OBJECTS_PATH} (${objectsArray.length} objects)`);
+
+// Optionally generate intermediate versions for size comparison
+if (generateAll) {
+  // Helper to deep clone
+  function clone<T>(obj: T): T {
+    return JSON.parse(JSON.stringify(obj));
+  }
+
+  // Build full webhooks (no drop, no strip) from fresh data
+  const fullWebhooks: Record<string, Record<string, any>> = {};
+  for (const webhook of webhooks) {
+    const w = clone(webhook);
+    if (!w.action) w.action = "default";
+    fullWebhooks[w.category] ||= {};
+    fullWebhooks[w.category][w.action] = w;
+  }
+
+  // Generate all version (no drop, no strip)
+  const allWebhooks = clone(fullWebhooks);
+  const allObjects = deduplicateWebhooks(allWebhooks);
+  await fs.writeFile(ALL_OUTPUT_PATH, JSON.stringify(allWebhooks, null, 2));
+  await fs.writeFile(ALL_OBJECTS_PATH, JSON.stringify(allObjects, null, 2));
+  console.log(`Wrote ${ALL_OUTPUT_PATH} (${Object.keys(allWebhooks).length} events)`);
+  console.log(`Wrote ${ALL_OBJECTS_PATH} (${allObjects.length} objects)`);
+
+  // Generate drop-only version (drop events, no strip)
+  const dropWebhooks = clone(fullWebhooks);
+  for (const event of DROPPED_EVENTS) {
+    delete dropWebhooks[event];
+  }
+  const dropObjects = deduplicateWebhooks(dropWebhooks);
+  await fs.writeFile(DROP_OUTPUT_PATH, JSON.stringify(dropWebhooks, null, 2));
+  await fs.writeFile(DROP_OBJECTS_PATH, JSON.stringify(dropObjects, null, 2));
+  console.log(`Wrote ${DROP_OUTPUT_PATH} (${Object.keys(dropWebhooks).length} events)`);
+  console.log(`Wrote ${DROP_OBJECTS_PATH} (${dropObjects.length} objects)`);
+
+  // Generate strip-only version (strip fields, no drop)
+  const stripWebhooks = stripFields(clone(fullWebhooks));
+  const stripObjects = deduplicateWebhooks(stripWebhooks);
+  await fs.writeFile(STRIP_OUTPUT_PATH, JSON.stringify(stripWebhooks, null, 2));
+  await fs.writeFile(STRIP_OBJECTS_PATH, JSON.stringify(stripObjects, null, 2));
+  console.log(`Wrote ${STRIP_OUTPUT_PATH} (${Object.keys(stripWebhooks).length} events)`);
+  console.log(`Wrote ${STRIP_OBJECTS_PATH} (${stripObjects.length} objects)`);
+}

languageservice/src/complete.expressions.test.ts

@@ -299,7 +299,16 @@ jobs:
         "on: push\njobs:\n  build:\n    runs-on: ubuntu-latest\n    environment:\n      url: ${{ runner.| }}\n    steps:\n      - run: echo";
       const result = await complete(...getPositionFromCursor(input), {contextProviderConfig});
 
-      expect(result.map(x => x.label)).toEqual(["arch", "name", "os", "temp", "tool_cache"]);
+      expect(result.map(x => x.label)).toEqual([
+        "arch",
+        "debug",
+        "environment",
+        "name",
+        "os",
+        "temp",
+        "tool_cache",
+        "workspace"
+      ]);
     });
 
     describe("job if", () => {
@@ -861,7 +870,7 @@ jobs:
   });
 
   describe("strategy context", () => {
-    it("strategy is not suggested when outside of a matrix job", async () => {
+    it("strategy is suggested even when no strategy defined", async () => {
       const input = `
 on: push
 
@@ -875,7 +884,7 @@ jobs:
 
       const result = await complete(...getPositionFromCursor(input), {contextProviderConfig});
 
-      expect(result.map(x => x.label)).not.toContain("strategy");
+      expect(result.map(x => x.label)).toContain("strategy");
     });
 
     it("strategy is suggested within a matrix job", async () => {
@@ -922,7 +931,7 @@ jobs:
   });
 
   describe("matrix context", () => {
-    it("matrix is not suggested when outside of a matrix job", async () => {
+    it("matrix is suggested even when no strategy defined", async () => {
       const input = `
 on: push
 
@@ -936,7 +945,7 @@ jobs:
 
       const result = await complete(...getPositionFromCursor(input), {contextProviderConfig});
 
-      expect(result.map(x => x.label)).not.toContain("strategy");
+      expect(result.map(x => x.label)).toContain("matrix");
     });
 
     it("matrix is suggested within a matrix job", async () => {
@@ -1123,10 +1132,12 @@ jobs:
         "github",
         "inputs",
         "job",
+        "matrix",
         "needs",
         "runner",
         "secrets",
         "steps",
+        "strategy",
         "vars",
         "contains",
         "endsWith",
@@ -1268,7 +1279,7 @@ jobs:
 on: push
 jobs:
   a:
-    uses: ./reusable-workflow-with-outputs.yaml
+    uses: ./.github/workflows/reusable-workflow-with-outputs.yaml
   b:
     needs: [a]
     runs-on: ubuntu-latest

languageservice/src/complete.multiline-if.test.ts

@@ -0,0 +1,169 @@
+import {complete} from "./complete";
+import {TextDocument} from "vscode-languageserver-textdocument";
+import {clearCache} from "./utils/workflow-cache";
+import {getPositionFromCursor} from "./test-utils/cursor-position";
+
+beforeEach(() => {
+  clearCache();
+});
+
+describe("Issue #81 - multi-line if expression completion", () => {
+  it("should complete in block scalar if with | (exact position)", async () => {
+    // Exact reproduction from issue - cursor after "github." in block scalar
+    const input = `on: push
+
+jobs:
+  build:
+    if: |
+      github.
+    runs-on: ubuntu-latest
+    steps:
+    - run: echo`;
+
+    const doc = TextDocument.create("file:///test.yaml", "yaml", 1, input);
+    // Line 5 (0-indexed) = "      github.", character 13 = after the dot
+    const pos = {line: 5, character: 13};
+
+    const result = await complete(doc, pos, {});
+
+    expect(result.length).toBeGreaterThan(0);
+    expect(result.map(x => x.label)).toContain("event");
+    expect(result.map(x => x.label)).toContain("actor");
+  });
+
+  it("should complete in block scalar if with > (exact position)", async () => {
+    const input = `on: push
+
+jobs:
+  build:
+    if: >
+      github.
+    runs-on: ubuntu-latest
+    steps:
+    - run: echo`;
+
+    const doc = TextDocument.create("file:///test.yaml", "yaml", 1, input);
+    const pos = {line: 5, character: 13};
+
+    const result = await complete(doc, pos, {});
+
+    expect(result.length).toBeGreaterThan(0);
+    expect(result.map(x => x.label)).toContain("event");
+  });
+
+  it("should complete in block scalar with multiple lines", async () => {
+    const input = `on: push
+jobs:
+  build:
+    if: |
+      github.event_name == 'push' &&
+      github.|
+    runs-on: ubuntu-latest
+    steps:
+    - run: echo`;
+
+    // Skip 1 to skip the `|` block scalar indicator (same character as cursor marker)
+    const result = await complete(...getPositionFromCursor(input, 1), {});
+
+    expect(result.length).toBeGreaterThan(0);
+    expect(result.map(x => x.label)).toContain("event");
+  });
+
+  it("should complete step if in block scalar", async () => {
+    const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - run: echo
+      if: |
+        github.
+`;
+
+    const doc = TextDocument.create("file:///test.yaml", "yaml", 1, input);
+    // Line 7 = "        github.", character 15 = after the dot (8 spaces + 7 chars)
+    const pos = {line: 7, character: 15};
+
+    const result = await complete(doc, pos, {});
+
+    expect(result.length).toBeGreaterThan(0);
+    expect(result.map(x => x.label)).toContain("event");
+  });
+
+  it("should complete in block scalar with ${{ expression markers", async () => {
+    // This case works because transform() skips lines with ${{
+    // Note: Using explicit position because | appears in multiple places (block scalar, ||, cursor)
+    const input = `on: push
+jobs:
+  build:
+    if: |
+      \${{
+        github.ref == 'refs/heads/main' ||
+        github.
+    runs-on: ubuntu-latest
+    steps:
+    - run: echo`;
+
+    const doc = TextDocument.create("file:///test.yaml", "yaml", 1, input);
+    // Line 6 = "        github." = 8 spaces + 7 chars = 15 chars, cursor after dot is at char 15
+    const pos = {line: 6, character: 15};
+
+    const result = await complete(doc, pos, {});
+
+    expect(result.length).toBeGreaterThan(0);
+    expect(result.map(x => x.label)).toContain("ref");
+    expect(result.map(x => x.label)).toContain("ref_name");
+  });
+});
+
+describe("Edge cases for getOffsetInContent", () => {
+  it("should complete in single-line if (not block scalar)", async () => {
+    const input = `on: push
+jobs:
+  build:
+    if: github.|
+    runs-on: ubuntu-latest
+    steps:
+    - run: echo`;
+
+    const result = await complete(...getPositionFromCursor(input), {});
+
+    expect(result.length).toBeGreaterThan(0);
+    expect(result.map(x => x.label)).toContain("event");
+  });
+
+  it("should complete on third content line of block scalar", async () => {
+    const input = `on: push
+jobs:
+  build:
+    if: |
+      github.event_name == 'push' &&
+      github.ref == 'refs/heads/main' &&
+      github.|
+    runs-on: ubuntu-latest
+    steps:
+    - run: echo`;
+
+    const result = await complete(...getPositionFromCursor(input, 1), {});
+
+    expect(result.length).toBeGreaterThan(0);
+    expect(result.map(x => x.label)).toContain("event");
+  });
+
+  it("should complete when block scalar has empty first line", async () => {
+    const input = `on: push
+jobs:
+  build:
+    if: |
+
+      github.|
+    runs-on: ubuntu-latest
+    steps:
+    - run: echo`;
+
+    const result = await complete(...getPositionFromCursor(input, 1), {});
+
+    expect(result.length).toBeGreaterThan(0);
+    expect(result.map(x => x.label)).toContain("event");
+  });
+});

languageservice/src/complete.reusable-workflows.test.ts

@@ -21,7 +21,7 @@ on: push
 
 jobs:
   build:
-    uses: ./reusable-workflow-with-inputs.yaml
+    uses: ./.github/workflows/reusable-workflow-with-inputs.yaml
     with:
       |
 `;
@@ -49,7 +49,7 @@ on: push
 
 jobs:
   build:
-    uses: ./reusable-workflow-with-inputs.yaml
+    uses: ./.github/workflows/reusable-workflow-with-inputs.yaml
     with:
       username: monalisa
       |
@@ -74,7 +74,7 @@ on: push
 
 jobs:
   build:
-    uses: ./reusable-workflow-with-inputs.yaml
+    uses: ./.github/workflows/reusable-workflow-with-inputs.yaml
     secrets:
       |
 `;
@@ -102,7 +102,7 @@ on: push
 
 jobs:
   build:
-    uses: ./reusable-workflow-with-inputs.yaml
+    uses: ./.github/workflows/reusable-workflow-with-inputs.yaml
     secrets: |
 `;
     const result = await complete(...getPositionFromCursor(input), {fileProvider: testFileProvider});
@@ -117,7 +117,7 @@ on: push
 
 jobs:
   build:
-    uses: ./reusable-workflow-with-inputs.yaml
+    uses: ./.github/workflows/reusable-workflow-with-inputs.yaml
     secrets:
       envPAT: "myPAT"
       |

languageservice/src/complete.ts

@@ -5,6 +5,7 @@ import {ErrorPolicy} from "@actions/workflow-parser/model/convert";
 import {OPEN_EXPRESSION} from "@actions/workflow-parser/templates/template-constants";
 import {TemplateToken} from "@actions/workflow-parser/templates/tokens/index";
 import {MappingToken} from "@actions/workflow-parser/templates/tokens/mapping-token";
+import {TokenRange} from "@actions/workflow-parser/templates/tokens/token-range";
 import {TokenType} from "@actions/workflow-parser/templates/tokens/types";
 import {File} from "@actions/workflow-parser/workflows/file";
 import {FileProvider} from "@actions/workflow-parser/workflows/file-provider";
@@ -19,7 +20,6 @@ import {isPotentiallyExpression} from "./utils/expression-detection";
 import {findToken} from "./utils/find-token";
 import {guessIndentation} from "./utils/indentation-guesser";
 import {mapRange} from "./utils/range";
-import {getRelCharOffset} from "./utils/rel-char-pos";
 import {isPlaceholder, transform} from "./utils/transform";
 import {fetchOrConvertWorkflowTemplate, fetchOrParseWorkflow} from "./utils/workflow-cache";
 import {Value, ValueProviderConfig} from "./value-providers/config";
@@ -238,12 +238,12 @@ function getExpressionCompletionItems(
     currentInput = stringToken.source || stringToken.value;
   }
 
-  const relCharOffset = getRelCharOffset(token.range, currentInput, pos);
+  const cursorOffset = getOffsetInContent(token.range, currentInput, pos);
-  const expressionInput = (getExpressionInput(currentInput, relCharOffset) || "").trim();
+  const expressionInput = (getExpressionInput(currentInput, cursorOffset) || "").trim();
 
   try {
     return completeExpression(expressionInput, context, [], validatorFunctions).map(item =>
-      mapExpressionCompletionItem(item, currentInput[relCharOffset])
+      mapExpressionCompletionItem(item, currentInput[cursorOffset])
     );
   } catch (e) {
     error(`Error while completing expression: '${(e as Error)?.message || "<no details>"}'`);
@@ -274,3 +274,50 @@ function mapExpressionCompletionItem(item: ExpressionCompletionItem, charAfterPo
     kind: item.function ? CompletionItemKind.Function : CompletionItemKind.Variable
   };
 }
+
+/**
+ * Converts a document position to an offset within the token's content string.
+ */
+function getOffsetInContent(tokenRange: TokenRange, currentInput: string, pos: Position): number {
+  const range = mapRange(tokenRange);
+
+  if (range.start.line === range.end.line) {
+    // Single-line example:
+    //   if: github.ref == 'main'
+    //       ^8      ^15 (cursor)
+    // currentInput = "github.ref == 'main'"
+    // offset = 15 - 8 = 7
+    return pos.character - range.start.character;
+  }
+
+  // Multi-line example:
+  //   if: |                         <- line 3 (range.start.line)
+  //     first line                  <- line 4, content line 0
+  //     second line                 <- line 5, content line 1
+  //     github.                     <- line 6, content line 2, cursor at index 11
+  //            ^11 (cursor)
+  //
+  // currentInput = "    first line\n    second line\n    github."
+  //                 ^0              ^15              ^32        ^43
+
+  // Line index within content.
+  // From the example:
+  // lineIndexWithinContent = pos.line - range.start.line - 1
+  //                        = 6 - 3 - 1 = 2
+  const lineIndexWithinContent = pos.line - range.start.line - 1;
+
+  // Length of content before current line.
+  // From the example:
+  // lengthOfContentBeforeCurrentLine => 14 + 1 = 15 (after first iteration)
+  //                                  => 31 + 1 = 32 (after second iteration)
+  let lengthOfContentBeforeCurrentLine = 0;
+  for (let i = 0; i < lineIndexWithinContent; i++) {
+    lengthOfContentBeforeCurrentLine = currentInput.indexOf("\n", lengthOfContentBeforeCurrentLine) + 1;
+  }
+
+  // Final offset within content.
+  // From the example:
+  // finalOffset = lengthOfContentBeforeCurrentLine + pos.character
+  //             = 32 + 11 = 43
+  return lengthOfContentBeforeCurrentLine + pos.character;
+}

languageservice/src/context-providers/default.test.ts

@@ -0,0 +1,97 @@
+import {DescriptionDictionary} from "@actions/expressions";
+import {WorkflowContext} from "../context/workflow-context";
+import {getContext, Mode} from "./default";
+
+describe("getContext", () => {
+  const emptyWorkflowContext: WorkflowContext = {
+    uri: "test.yaml",
+    template: undefined
+  };
+
+  describe("when no contextProviderConfig is provided", () => {
+    it("should mark secrets context as incomplete", async () => {
+      const result = await getContext(["secrets"], undefined, emptyWorkflowContext, Mode.Validation);
+
+      const secretsContext = result.get("secrets") as DescriptionDictionary;
+      expect(secretsContext).toBeDefined();
+      expect(secretsContext.complete).toBe(false);
+    });
+
+    it("should mark vars context as incomplete", async () => {
+      const result = await getContext(["vars"], undefined, emptyWorkflowContext, Mode.Validation);
+
+      const varsContext = result.get("vars") as DescriptionDictionary;
+      expect(varsContext).toBeDefined();
+      expect(varsContext.complete).toBe(false);
+    });
+
+    it("should not mark other contexts as incomplete", async () => {
+      const result = await getContext(["env", "github"], undefined, emptyWorkflowContext, Mode.Validation);
+
+      const envContext = result.get("env") as DescriptionDictionary;
+      const githubContext = result.get("github") as DescriptionDictionary;
+
+      // These contexts are derived from the workflow file, so they can be complete
+      expect(envContext).toBeDefined();
+      expect(envContext.complete).toBe(true);
+      expect(githubContext).toBeDefined();
+      expect(githubContext.complete).toBe(true);
+    });
+  });
+
+  describe("when contextProviderConfig returns a value", () => {
+    it("should use the provided context for secrets", async () => {
+      const providedContext = new DescriptionDictionary();
+      providedContext.complete = true; // Provider fetched from API, so it's complete
+
+      const config = {
+        getContext: () => Promise.resolve(providedContext)
+      };
+
+      const result = await getContext(["secrets"], config, emptyWorkflowContext, Mode.Validation);
+
+      const secretsContext = result.get("secrets");
+      expect(secretsContext).toBe(providedContext);
+      expect((secretsContext as DescriptionDictionary).complete).toBe(true);
+    });
+
+    it("should use the provided context for vars", async () => {
+      const providedContext = new DescriptionDictionary();
+      providedContext.complete = true;
+
+      const config = {
+        getContext: () => Promise.resolve(providedContext)
+      };
+
+      const result = await getContext(["vars"], config, emptyWorkflowContext, Mode.Validation);
+
+      const varsContext = result.get("vars");
+      expect(varsContext).toBe(providedContext);
+      expect((varsContext as DescriptionDictionary).complete).toBe(true);
+    });
+  });
+
+  describe("when contextProviderConfig returns undefined", () => {
+    it("should mark secrets as incomplete", async () => {
+      const config = {
+        getContext: () => Promise.resolve(undefined)
+      };
+
+      const result = await getContext(["secrets"], config, emptyWorkflowContext, Mode.Validation);
+
+      const secretsContext = result.get("secrets") as DescriptionDictionary;
+      expect(secretsContext.complete).toBe(false);
+    });
+
+    it("should mark vars as incomplete", async () => {
+      const config = {
+        getContext: () => Promise.resolve(undefined)
+      };
+
+      const result = await getContext(["vars"], config, emptyWorkflowContext, Mode.Validation);
+
+      const varsContext = result.get("vars") as DescriptionDictionary;
+      expect(varsContext.complete).toBe(false);
+    });
+  });
+});

languageservice/src/context-providers/default.ts

@@ -32,15 +32,24 @@ export async function getContext(
 ): Promise<DescriptionDictionary> {
   const context = new DescriptionDictionary();
 
-  const filteredNames = filterContextNames(names, workflowContext);
+  // All context names are valid - strategy and matrix are always available
-  for (const contextName of filteredNames) {
+  // (with default values when no strategy block is defined)
+  for (const contextName of names) {
     let value = getDefaultContext(contextName, workflowContext, mode) || new DescriptionDictionary();
     if (value.kind === Kind.Null) {
       context.add(contextName, value);
       continue;
     }
 
-    value = (await config?.getContext(contextName, value, workflowContext, mode)) || value;
+    const remoteValue = await config?.getContext(contextName, value, workflowContext, mode);
+    if (remoteValue) {
+      value = remoteValue;
+    } else if (contextName === "secrets" || contextName === "vars") {
+      // Without a context provider to fetch remote secrets/vars, we can't know
+      // what values exist, so mark the context as incomplete to avoid false
+      // "Context access might be invalid" warnings
+      value.complete = false;
+    }
 
     context.add(contextName, value, getDescription(RootContext, contextName));
   }
@@ -74,11 +83,14 @@ function getDefaultContext(name: string, workflowContext: WorkflowContext, mode:
 
     case "runner":
       return objectToDictionary({
-        os: "Linux",
         arch: "X64",
+        debug: "1",
+        environment: "github-hosted",
         name: "GitHub Actions 2",
+        os: "Linux",
+        temp: "/home/runner/work/_temp",
         tool_cache: "/opt/hostedtoolcache",
-        temp: "/home/runner/work/_temp"
+        workspace: "/home/runner/work/repo"
       });
 
     case "secrets":
@@ -103,18 +115,3 @@ function objectToDictionary(object: {[key: string]: string}): DescriptionDiction
 
   return dictionary;
 }
-
-function filterContextNames(contextNames: string[], workflowContext: WorkflowContext): string[] {
-  return contextNames.filter(name => {
-    switch (name) {
-      case "matrix":
-      case "strategy":
-        return hasStrategy(workflowContext);
-    }
-    return true;
-  });
-}
-
-function hasStrategy(workflowContext: WorkflowContext): boolean {
-  return workflowContext.job?.strategy !== undefined || workflowContext.reusableWorkflowJob?.strategy !== undefined;
-}

languageservice/src/context-providers/descriptions.json

@@ -239,7 +239,13 @@
       "description": "The path to the directory containing preinstalled tools for GitHub-hosted runners. For more information, see \"[About GitHub-hosted runners](https://docs.github.com/actions/reference/specifications-for-github-hosted-runners/#supported-software).\""
     },
     "debug": {
-      "description": "This is set only if [debug logging](https://docs.github.com/actions/monitoring-and-troubleshooting-workflows/enabling-debug-logging) is enabled, and always has the value of `1`. It can be useful as an indicator to enable additional debugging or verbose logging in your own job steps."
+      "description": "This is set only if [`ACTIONS_STEP_DEBUG`](https://docs.github.com/actions/monitoring-and-troubleshooting-workflows/enabling-debug-logging) is enabled, and always has the value of `\"1\"`. It can be useful as an indicator to enable additional debugging or verbose logging in your own job steps."
+    },
+    "environment": {
+      "description": "The environment of the runner executing the job. Possible values are `github-hosted` for GitHub-hosted runners, or `self-hosted` for self-hosted runners."
+    },
+    "workspace": {
+      "description": "The runner-specific working directory path for the job."
     }
   },
   "strategy": {

languageservice/src/context-providers/descriptions.ts

@@ -1,4 +1,4 @@
-import descriptions from "./descriptions.json";
+import descriptions from "./descriptions.min.json";
 
 export const RootContext = "root";
 const FunctionContext = "functions";

languageservice/src/context-providers/events/eventPayloads.test.ts

@@ -0,0 +1,102 @@
+import {DescriptionDictionary} from "@actions/expressions";
+import {getEventPayload, getSupportedEventTypes} from "./eventPayloads";
+
+describe("eventPayloads", () => {
+  describe("getSupportedEventTypes", () => {
+    it("returns action types for push event", () => {
+      const types = getSupportedEventTypes("push");
+      expect(types).toContain("default");
+    });
+
+    it("returns action types for issues event", () => {
+      const types = getSupportedEventTypes("issues");
+      expect(types.length).toBeGreaterThan(1);
+      expect(types).toContain("opened");
+      expect(types).toContain("closed");
+    });
+  });
+
+  describe("getEventPayload", () => {
+    it("returns payload for push event", () => {
+      const payload = getEventPayload("push", "default");
+      expect(payload).toBeDefined();
+
+      // Verify common fields exist
+      expect(payload?.get("ref")).toBeDefined();
+      expect(payload?.get("repository")).toBeDefined();
+      expect(payload?.get("sender")).toBeDefined();
+    });
+
+    it("returns payload for issues event", () => {
+      const payload = getEventPayload("issues", "opened");
+      expect(payload).toBeDefined();
+
+      expect(payload?.get("action")).toBeDefined();
+      expect(payload?.get("issue")).toBeDefined();
+      expect(payload?.get("repository")).toBeDefined();
+    });
+
+    it("preserves descriptions for hover documentation", () => {
+      // This test ensures bodyParameters[].description is not stripped
+      // during JSON optimization. The description field is used for hover
+      // documentation in the workflow editor.
+      const payload = getEventPayload("push", "default");
+      expect(payload).toBeDefined();
+
+      // Get the description for a well-known field
+      // repository should have a description like "A repository on GitHub"
+      const repoDescription = payload?.getDescription("repository");
+      expect(repoDescription).toBeDefined();
+      expect(repoDescription?.length).toBeGreaterThan(0);
+
+      // sender should have a description
+      const senderDescription = payload?.getDescription("sender");
+      expect(senderDescription).toBeDefined();
+      expect(senderDescription?.length).toBeGreaterThan(0);
+    });
+
+    it("preserves childParamsGroups for nested property access", () => {
+      // This test ensures bodyParameters[].childParamsGroups is not stripped
+      // during JSON optimization. childParamsGroups defines nested properties
+      // used for autocompletion like github.event.repository.owner.login
+      const payload = getEventPayload("push", "default");
+      expect(payload).toBeDefined();
+
+      // repository has nested properties like owner, license, etc.
+      const repository = payload?.get("repository") as DescriptionDictionary | undefined;
+      expect(repository).toBeDefined();
+
+      // repository.owner should exist (nested via childParamsGroups)
+      const owner = repository?.get("owner") as DescriptionDictionary | undefined;
+      expect(owner).toBeDefined();
+
+      // repository.owner.login should exist (deeply nested)
+      const login = owner?.get("login");
+      expect(login).toBeDefined();
+    });
+
+    it("preserves name fields for property identification", () => {
+      // This test ensures bodyParameters[].name is not stripped
+      // during JSON optimization. The name field identifies each property.
+      const payload = getEventPayload("issues", "opened");
+      expect(payload).toBeDefined();
+
+      // Verify well-known property names exist
+      expect(payload?.get("action")).toBeDefined();
+      expect(payload?.get("issue")).toBeDefined();
+      expect(payload?.get("repository")).toBeDefined();
+      expect(payload?.get("sender")).toBeDefined();
+
+      // Verify nested property names work
+      const issue = payload?.get("issue") as DescriptionDictionary | undefined;
+      expect(issue?.get("title")).toBeDefined();
+      expect(issue?.get("number")).toBeDefined();
+      expect(issue?.get("user")).toBeDefined();
+    });
+
+    it("returns undefined for unknown event", () => {
+      const payload = getEventPayload("not_a_real_event", "default");
+      expect(payload).toBeUndefined();
+    });
+  });
+});

languageservice/src/context-providers/events/eventPayloads.ts

@@ -1,10 +1,10 @@
 import {data, DescriptionDictionary} from "@actions/expressions";
 
-import webhookObjects from "./objects.json";
+import webhookObjects from "./objects.min.json";
-import webhooks from "./webhooks.json";
+import webhooks from "./webhooks.min.json";
 
-import schedule from "./schedule.json";
+import schedule from "./schedule.min.json";
-import workflow_call from "./workflow_call.json";
+import workflow_call from "./workflow_call.min.json";
 
 const customEventPayloads: {[name: string]: unknown} = {
   schedule,

languageservice/src/context-providers/matrix.test.ts

@@ -64,7 +64,7 @@ describe("matrix context", () => {
       expect(workflowContext.job).toBeUndefined();
 
       const context = getMatrixContext(workflowContext, Mode.Validation);
-      expect(context).toEqual(new DescriptionDictionary());
+      expect(context).toEqual(new data.Null());
     });
 
     it("strategy not defined", () => {
@@ -73,7 +73,7 @@ describe("matrix context", () => {
       expect(workflowContext.job!.strategy).toBeUndefined();
 
       const context = getMatrixContext(workflowContext, Mode.Validation);
-      expect(context).toEqual(new DescriptionDictionary());
+      expect(context).toEqual(new data.Null());
     });
 
     it("strategy is not a mapping token", () => {
@@ -81,7 +81,7 @@ describe("matrix context", () => {
       expect(workflowContext.job!.strategy).toBeDefined();
 
       const context = getMatrixContext(workflowContext, Mode.Validation);
-      expect(context).toEqual(new DescriptionDictionary());
+      expect(context).toEqual(new data.Null());
     });
 
     it("matrix is not defined", () => {

languageservice/src/context-providers/matrix.ts

@@ -10,7 +10,8 @@ export function getMatrixContext(workflowContext: WorkflowContext, mode: Mode):
   // https://docs.github.com/en/actions/learn-github-actions/contexts#matrix-context
   const strategy = workflowContext.job?.strategy ?? workflowContext.reusableWorkflowJob?.strategy;
   if (!strategy || !isMapping(strategy)) {
-    return new DescriptionDictionary();
+    // No strategy defined - matrix is null at runtime (not empty object)
+    return new data.Null();
   }
 
   const matrix = strategy.find("matrix");

languageservice/src/context-providers/needs.test.ts

@@ -111,7 +111,7 @@ jobs:
 on: push
 jobs:
   a:
-    uses: ./reusable-workflow-with-outputs.yaml
+    uses: ./.github/workflows/reusable-workflow-with-outputs.yaml
 
   b:
     needs: [a]

languageservice/src/context-providers/steps.test.ts

@@ -0,0 +1,78 @@
+/* eslint-disable @typescript-eslint/no-non-null-assertion */
+import {DescriptionDictionary, isDescriptionDictionary} from "@actions/expressions";
+import {WorkflowContext} from "../context/workflow-context";
+import {getStepsContext} from "./steps";
+
+function createWorkflowContext(stepIds: string[], currentStepId?: string): WorkflowContext {
+  return {
+    job: {
+      steps: stepIds.map(id => ({id}))
+    },
+    step: currentStepId ? {id: currentStepId} : undefined
+  } as WorkflowContext;
+}
+
+describe("steps context", () => {
+  it("returns empty dictionary when no job", () => {
+    const workflowContext = {} as WorkflowContext;
+    const context = getStepsContext(workflowContext);
+    expect(context.pairs().length).toBe(0);
+  });
+
+  it("returns empty dictionary when no steps", () => {
+    const workflowContext = {job: {}} as WorkflowContext;
+    const context = getStepsContext(workflowContext);
+    expect(context.pairs().length).toBe(0);
+  });
+
+  it("includes steps with user-defined ids", () => {
+    const workflowContext = createWorkflowContext(["step-a", "step-b"]);
+    const context = getStepsContext(workflowContext);
+
+    expect(context.get("step-a")).toBeDefined();
+    expect(context.get("step-b")).toBeDefined();
+  });
+
+  it("excludes generated step ids (starting with __)", () => {
+    const workflowContext = createWorkflowContext(["step-a", "__generated"]);
+    const context = getStepsContext(workflowContext);
+
+    expect(context.get("step-a")).toBeDefined();
+    expect(context.get("__generated")).toBeUndefined();
+  });
+
+  it("excludes current step and later steps", () => {
+    const workflowContext = createWorkflowContext(["step-a", "step-b", "step-c"], "step-b");
+    const context = getStepsContext(workflowContext);
+
+    expect(context.get("step-a")).toBeDefined();
+    expect(context.get("step-b")).toBeUndefined();
+    expect(context.get("step-c")).toBeUndefined();
+  });
+
+  describe("step outputs", () => {
+    it("outputs is a dictionary, not null", () => {
+      const workflowContext = createWorkflowContext(["step-a"]);
+      const context = getStepsContext(workflowContext);
+
+      const stepContext = context.get("step-a");
+      expect(stepContext).toBeDefined();
+      expect(isDescriptionDictionary(stepContext!)).toBe(true);
+
+      const outputs = (stepContext as DescriptionDictionary).get("outputs");
+      expect(outputs).toBeDefined();
+      expect(isDescriptionDictionary(outputs!)).toBe(true);
+    });
+
+    it("outputs is marked incomplete to allow dynamic outputs", () => {
+      const workflowContext = createWorkflowContext(["step-a"]);
+      const context = getStepsContext(workflowContext);
+
+      const stepContext = context.get("step-a") as DescriptionDictionary;
+      const outputs = stepContext.get("outputs") as DescriptionDictionary;
+
+      // Outputs should be incomplete since we can't know what outputs a step will produce
+      expect(outputs.complete).toBe(false);
+    });
+  });
+});

languageservice/src/context-providers/steps.ts

@@ -31,7 +31,10 @@ function stepContext(): DescriptionDictionary {
   // https://docs.github.com/en/actions/learn-github-actions/contexts#steps-context
   const d = new DescriptionDictionary();
 
-  d.add("outputs", new data.Null(), getDescription("steps", "outputs"));
+  // Step outputs are dynamic - actions can generate outputs based on their inputs
+  const outputs = new DescriptionDictionary();
+  outputs.complete = false;
+  d.add("outputs", outputs, getDescription("steps", "outputs"));
 
   // Can be "success", "failure", "cancelled", or "skipped"
   d.add("conclusion", new data.Null(), getDescription("steps", "conclusion"));

languageservice/src/context-providers/strategy.test.ts

@@ -0,0 +1,126 @@
+import {data} from "@actions/expressions";
+import {Job} from "@actions/workflow-parser/model/workflow-template";
+import {BooleanToken} from "@actions/workflow-parser/templates/tokens/boolean-token";
+import {MappingToken} from "@actions/workflow-parser/templates/tokens/mapping-token";
+import {NumberToken} from "@actions/workflow-parser/templates/tokens/number-token";
+import {StringToken} from "@actions/workflow-parser/templates/tokens/string-token";
+import {TemplateToken} from "@actions/workflow-parser/templates/tokens/template-token";
+import {WorkflowContext} from "../context/workflow-context";
+import {getStrategyContext} from "./strategy";
+
+function stringToToken(value: string) {
+  return new StringToken(undefined, undefined, value, undefined);
+}
+
+function boolToToken(value: boolean) {
+  return new BooleanToken(undefined, undefined, value, undefined);
+}
+
+function numberToToken(value: number) {
+  return new NumberToken(undefined, undefined, value, undefined);
+}
+
+function contextFromStrategy(strategy?: TemplateToken) {
+  return {
+    job: {
+      strategy: strategy
+    }
+  } as WorkflowContext;
+}
+
+describe("strategy context", () => {
+  describe("no strategy defined", () => {
+    it("returns defaults when job is undefined", () => {
+      const workflowContext = {} as WorkflowContext;
+
+      const context = getStrategyContext(workflowContext);
+
+      expect(context.get("fail-fast")).toEqual(new data.BooleanData(true));
+      expect(context.get("job-index")).toEqual(new data.NumberData(0));
+      expect(context.get("job-total")).toEqual(new data.NumberData(1));
+      expect(context.get("max-parallel")).toEqual(new data.NumberData(1));
+    });
+
+    it("returns defaults when strategy is undefined", () => {
+      const job = {} as Job;
+      const workflowContext = {job} as WorkflowContext;
+
+      const context = getStrategyContext(workflowContext);
+
+      expect(context.get("fail-fast")).toEqual(new data.BooleanData(true));
+      expect(context.get("job-index")).toEqual(new data.NumberData(0));
+      expect(context.get("job-total")).toEqual(new data.NumberData(1));
+      expect(context.get("max-parallel")).toEqual(new data.NumberData(1));
+    });
+
+    it("returns defaults when strategy is not a mapping", () => {
+      const workflowContext = contextFromStrategy(stringToToken("hello"));
+
+      const context = getStrategyContext(workflowContext);
+
+      expect(context.get("fail-fast")).toEqual(new data.BooleanData(true));
+      expect(context.get("job-index")).toEqual(new data.NumberData(0));
+      expect(context.get("job-total")).toEqual(new data.NumberData(1));
+      expect(context.get("max-parallel")).toEqual(new data.NumberData(1));
+    });
+  });
+
+  describe("strategy defined with partial properties", () => {
+    it("uses specified fail-fast, defaults for others", () => {
+      const strategy = new MappingToken(undefined, undefined, undefined);
+      strategy.add(stringToToken("fail-fast"), boolToToken(false));
+      const workflowContext = contextFromStrategy(strategy);
+
+      const context = getStrategyContext(workflowContext);
+
+      expect(context.get("fail-fast")).toEqual(new data.BooleanData(false));
+      expect(context.get("job-index")).toEqual(new data.NumberData(0));
+      expect(context.get("job-total")).toEqual(new data.NumberData(1));
+      expect(context.get("max-parallel")).toEqual(new data.NumberData(1));
+    });
+
+    it("uses specified max-parallel, defaults for others", () => {
+      const strategy = new MappingToken(undefined, undefined, undefined);
+      strategy.add(stringToToken("max-parallel"), numberToToken(5));
+      const workflowContext = contextFromStrategy(strategy);
+
+      const context = getStrategyContext(workflowContext);
+
+      expect(context.get("fail-fast")).toEqual(new data.BooleanData(true));
+      expect(context.get("job-index")).toEqual(new data.NumberData(0));
+      expect(context.get("job-total")).toEqual(new data.NumberData(1));
+      expect(context.get("max-parallel")).toEqual(new data.NumberData(5));
+    });
+
+    it("only has matrix defined, all strategy properties use defaults", () => {
+      const strategy = new MappingToken(undefined, undefined, undefined);
+      const matrix = new MappingToken(undefined, undefined, undefined);
+      strategy.add(stringToToken("matrix"), matrix);
+      const workflowContext = contextFromStrategy(strategy);
+
+      const context = getStrategyContext(workflowContext);
+
+      expect(context.get("fail-fast")).toEqual(new data.BooleanData(true));
+      expect(context.get("job-index")).toEqual(new data.NumberData(0));
+      expect(context.get("job-total")).toEqual(new data.NumberData(1));
+      expect(context.get("max-parallel")).toEqual(new data.NumberData(1));
+    });
+  });
+
+  describe("strategy with all properties defined", () => {
+    it("uses all specified values", () => {
+      const strategy = new MappingToken(undefined, undefined, undefined);
+      strategy.add(stringToToken("fail-fast"), boolToToken(false));
+      strategy.add(stringToToken("max-parallel"), numberToToken(3));
+      const workflowContext = contextFromStrategy(strategy);
+
+      const context = getStrategyContext(workflowContext);
+
+      expect(context.get("fail-fast")).toEqual(new data.BooleanData(false));
+      // job-index and job-total are runtime values, not specified in YAML
+      expect(context.get("job-index")).toEqual(new data.NumberData(0));
+      expect(context.get("job-total")).toEqual(new data.NumberData(1));
+      expect(context.get("max-parallel")).toEqual(new data.NumberData(3));
+    });
+  });
+});

languageservice/src/context-providers/strategy.ts

@@ -3,15 +3,24 @@ import {isMapping, isScalar, isString} from "@actions/workflow-parser";
 import {WorkflowContext} from "../context/workflow-context";
 import {scalarToData} from "../utils/scalar-to-data";
 
+// Default strategy values when no strategy block is defined
+const DEFAULT_STRATEGY = {
+  "fail-fast": new data.BooleanData(true),
+  "job-index": new data.NumberData(0),
+  "job-total": new data.NumberData(1),
+  "max-parallel": new data.NumberData(1)
+};
+
 export function getStrategyContext(workflowContext: WorkflowContext): DescriptionDictionary {
   // https://docs.github.com/en/actions/learn-github-actions/contexts#strategy-context
   const keys = ["fail-fast", "job-index", "job-total", "max-parallel"];
 
   const strategy = workflowContext.job?.strategy ?? workflowContext.reusableWorkflowJob?.strategy;
   if (!strategy || !isMapping(strategy)) {
+    // No strategy defined - return defaults that match runtime behavior
     return new DescriptionDictionary(
       ...keys.map(key => {
-        return {key, value: new data.Null()};
+        return {key, value: DEFAULT_STRATEGY[key as keyof typeof DEFAULT_STRATEGY]};
       })
     );
   }
@@ -31,7 +40,8 @@ export function getStrategyContext(workflowContext: WorkflowContext): Descriptio
 
   for (const key of keys) {
     if (!strategyContext.get(key)) {
-      strategyContext.add(key, new data.Null());
+      // Use default value for missing properties
+      strategyContext.add(key, DEFAULT_STRATEGY[key as keyof typeof DEFAULT_STRATEGY]);
     }
   }
 

languageservice/src/hover.reusable-workflow.test.ts

@@ -14,7 +14,7 @@ on: push
 
 jobs:
   build:
-    uses: ./reusable-workflow-with-inputs.yaml
+    uses: ./.github/workflows/reusable-workflow-with-inputs.yaml
     with:
       us|ername:
 `;
@@ -31,7 +31,7 @@ on: push
 
 jobs:
   build:
-    uses: ./reusable-workflow-with-inputs-no-description.yaml
+    uses: ./.github/workflows/reusable-workflow-with-inputs-no-description.yaml
     with:
       us|ername:
 `;
@@ -48,7 +48,7 @@ on: push
 
 jobs:
   build:
-    uses: ./reusable-workflow-with-outputs.yaml
+    uses: ./.github/workflows/reusable-workflow-with-outputs.yaml
   echo_outputs:
     runs-on: ubuntu-latest
     needs: build

languageservice/src/hover.test.ts

@@ -110,11 +110,8 @@ jobs:
 `;
     const result = await hover(...getPositionFromCursor(input));
     expect(result).not.toBeUndefined();
-    expect(result?.contents).toEqual(
+    // Cron description is now shown via diagnostics, not hover
-      "Runs at 0 and 30 minutes past the hour, at 00:00 and 12:00\n\n" +
+    expect(result?.contents).toEqual("");
-        "Actions schedules run at most every 5 minutes. " +
-        "[Learn more](https://docs.github.com/actions/using-workflows/workflow-syntax-for-github-actions#onschedule)"
-    );
   });
 
   it("on a cron mapping key", async () => {

languageservice/src/hover.ts

@@ -2,11 +2,9 @@ import {data, DescriptionDictionary, Parser} from "@actions/expressions";
 import {FunctionDefinition, FunctionInfo} from "@actions/expressions/funcs/info";
 import {Lexer} from "@actions/expressions/lexer";
 import {ErrorPolicy} from "@actions/workflow-parser/model/convert";
-import {getCronDescription} from "@actions/workflow-parser/model/converter/cron";
 import {splitAllowedContext} from "@actions/workflow-parser/templates/allowed-context";
-import {StringToken} from "@actions/workflow-parser/templates/tokens/string-token";
 import {TemplateToken} from "@actions/workflow-parser/templates/tokens/template-token";
-import {isBasicExpression, isString} from "@actions/workflow-parser/templates/tokens/type-guards";
+import {isBasicExpression} from "@actions/workflow-parser/templates/tokens/type-guards";
 import {File} from "@actions/workflow-parser/workflows/file";
 import {FileProvider} from "@actions/workflow-parser/workflows/file-provider";
 import {Position, TextDocument} from "vscode-languageserver-textdocument";
@@ -23,7 +21,7 @@ import {ExpressionPos, mapToExpressionPos} from "./expression-hover/expression-p
 import {HoverVisitor} from "./expression-hover/visitor";
 import {info} from "./log";
 import {isPotentiallyExpression} from "./utils/expression-detection";
-import {findToken, TokenResult} from "./utils/find-token";
+import {findToken} from "./utils/find-token";
 import {mapRange} from "./utils/range";
 import {fetchOrConvertWorkflowTemplate, fetchOrParseWorkflow} from "./utils/workflow-cache";
 
@@ -89,17 +87,6 @@ export async function hover(document: TextDocument, position: Position, config?:
 
   info(`Calculating hover for token with definition ${token.definition.key}`);
 
-  if (tokenResult.parent && isCronMappingValue(tokenResult)) {
-    const tokenValue = (token as StringToken).value;
-    const description = getCronDescription(tokenValue);
-    if (description) {
-      return {
-        contents: description,
-        range: mapRange(token.range)
-      } satisfies Hover;
-    }
-  }
-
   if (tokenResult.parent && isReusableWorkflowJobInput(tokenResult)) {
     let description = getReusableWorkflowInputDescription(workflowContext, tokenResult);
     description = appendContext(description, token.definitionInfo?.allowedContext);
@@ -156,15 +143,6 @@ async function getDescription(
   return description || defaultDescription;
 }
 
-function isCronMappingValue(tokenResult: TokenResult): boolean {
-  return (
-    tokenResult.parent?.definition?.key === "cron-mapping" &&
-    !!tokenResult.token &&
-    isString(tokenResult.token) &&
-    tokenResult.token.value !== "cron"
-  );
-}
-
 function expressionHover(
   exprPos: ExpressionPos,
   context: DescriptionDictionary,

languageservice/src/test-utils/test-file-provider.ts

@@ -5,9 +5,9 @@ export const testFileProvider: FileProvider = {
   // eslint-disable-next-line @typescript-eslint/require-await
   getFileContent: async ref => {
     switch (fileIdentifier(ref)) {
-      case "monalisa/octocat/workflow.yaml@main":
+      case "monalisa/octocat/.github/workflows/workflow.yaml@main":
         return {
-          name: "monalisa/octocat/workflow.yaml",
+          name: "monalisa/octocat/.github/workflows/workflow.yaml",
           content: `
 on: workflow_call
 jobs:
@@ -31,9 +31,9 @@ jobs:
 `
         };
 
-      case "./reusable-workflow.yaml":
+      case "./.github/workflows/reusable-workflow.yaml":
         return {
-          name: "reusable-workflow.yaml",
+          name: ".github/workflows/reusable-workflow.yaml",
           content: `
 on: workflow_call
 jobs:
@@ -44,9 +44,9 @@ jobs:
 `
         };
 
-      case "./reusable-workflow-with-inputs.yaml":
+      case "./.github/workflows/reusable-workflow-with-inputs.yaml":
         return {
-          name: "reusable-workflow-with-inputs.yaml",
+          name: ".github/workflows/reusable-workflow-with-inputs.yaml",
           content: `
 on:
   workflow_call:
@@ -76,9 +76,9 @@ jobs:
   `
         };
 
-      case "./reusable-workflow-with-inputs-no-description.yaml":
+      case "./.github/workflows/reusable-workflow-with-inputs-no-description.yaml":
         return {
-          name: "reusable-workflow-with-inputs.yaml",
+          name: ".github/workflows/reusable-workflow-with-inputs.yaml",
           content: `
 on:
   workflow_call:
@@ -95,9 +95,9 @@ jobs:
   `
         };
 
-      case "./reusable-workflow-with-outputs.yaml":
+      case "./.github/workflows/reusable-workflow-with-outputs.yaml":
         return {
-          name: "reusable-workflow-with-outputs.yaml",
+          name: ".github/workflows/reusable-workflow-with-outputs.yaml",
           content: `
 on:
   workflow_call:

languageservice/src/utils/rel-char-pos.ts

@@ -1,15 +0,0 @@
-import {TokenRange} from "@actions/workflow-parser/templates/tokens/token-range";
-import {Position} from "vscode-languageserver-textdocument";
-import {mapRange} from "./range";
-
-export function getRelCharOffset(tokenRange: TokenRange, currentInput: string, pos: Position): number {
-  const range = mapRange(tokenRange);
-  if (range.start.line !== range.end.line) {
-    const lines = currentInput.split("\n");
-    const lineDiff = pos.line - range.start.line - 1;
-    const linesBeforeCusor = lines.slice(0, lineDiff);
-    return linesBeforeCusor.join("\n").length + pos.character + 1;
-  } else {
-    return pos.character - range.start.character;
-  }
-}

languageservice/src/validate.concurrency.test.ts

@@ -0,0 +1,245 @@
+import {DiagnosticSeverity} from "vscode-languageserver-types";
+import {validate} from "./validate";
+import {createDocument} from "./test-utils/document";
+import {clearCache} from "./utils/workflow-cache";
+
+beforeEach(() => {
+  clearCache();
+});
+
+describe("validate concurrency deadlock", () => {
+  describe("should error on matching concurrency groups", () => {
+    it("simple string match", async () => {
+      const input = `
+on: push
+concurrency: test
+jobs:
+  job1:
+    runs-on: ubuntu-latest
+    concurrency: test
+    steps:
+      - run: echo hi`;
+
+      const result = await validate(createDocument("wf.yaml", input));
+
+      const concurrencyErrors = result.filter(d => d.message.includes("deadlock"));
+      expect(concurrencyErrors).toHaveLength(2);
+
+      // Workflow-level warning
+      expect(concurrencyErrors[0]).toMatchObject({
+        message: "Concurrency group 'test' is also used by job 'job1'. This will cause a deadlock.",
+        severity: DiagnosticSeverity.Error
+      });
+
+      // Job-level warning
+      expect(concurrencyErrors[1]).toMatchObject({
+        message: "Concurrency group 'test' is also defined at the workflow level. This will cause a deadlock.",
+        severity: DiagnosticSeverity.Error
+      });
+    });
+
+    it("workflow mapping form, job string form", async () => {
+      const input = `
+on: push
+concurrency:
+  group: my-group
+  cancel-in-progress: true
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    concurrency: my-group
+    steps:
+      - run: echo hi`;
+
+      const result = await validate(createDocument("wf.yaml", input));
+
+      const concurrencyErrors = result.filter(d => d.message.includes("deadlock"));
+      expect(concurrencyErrors).toHaveLength(2);
+      expect(concurrencyErrors[0].message).toContain("my-group");
+      expect(concurrencyErrors[0].message).toContain("deploy");
+    });
+
+    it("workflow string form, job mapping form", async () => {
+      const input = `
+on: push
+concurrency: deploy-group
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    concurrency:
+      group: deploy-group
+      cancel-in-progress: true
+    steps:
+      - run: echo hi`;
+
+      const result = await validate(createDocument("wf.yaml", input));
+
+      const concurrencyErrors = result.filter(d => d.message.includes("deadlock"));
+      expect(concurrencyErrors).toHaveLength(2);
+      expect(concurrencyErrors[0].message).toContain("deploy-group");
+    });
+
+    it("both mapping forms", async () => {
+      const input = `
+on: push
+concurrency:
+  group: shared
+jobs:
+  job1:
+    runs-on: ubuntu-latest
+    concurrency:
+      group: shared
+    steps:
+      - run: echo hi`;
+
+      const result = await validate(createDocument("wf.yaml", input));
+
+      const concurrencyErrors = result.filter(d => d.message.includes("deadlock"));
+      expect(concurrencyErrors).toHaveLength(2);
+    });
+
+    it("multiple jobs with matching concurrency", async () => {
+      const input = `
+on: push
+concurrency: shared
+jobs:
+  job1:
+    runs-on: ubuntu-latest
+    concurrency: shared
+    steps:
+      - run: echo hi
+  job2:
+    runs-on: ubuntu-latest
+    concurrency: shared
+    steps:
+      - run: echo hi`;
+
+      const result = await validate(createDocument("wf.yaml", input));
+
+      // Should have 2 warnings per job (workflow + job) = 4 total, but workflow is only warned once per match
+      // Actually: 1 workflow warning per matching job + 1 job warning per matching job = 4 total
+      const concurrencyErrors = result.filter(d => d.message.includes("deadlock"));
+      expect(concurrencyErrors).toHaveLength(4);
+    });
+  });
+
+  describe("should not warn", () => {
+    it("different concurrency groups", async () => {
+      const input = `
+on: push
+concurrency: workflow-group
+jobs:
+  job1:
+    runs-on: ubuntu-latest
+    concurrency: job-group
+    steps:
+      - run: echo hi`;
+
+      const result = await validate(createDocument("wf.yaml", input));
+
+      const concurrencyErrors = result.filter(d => d.message.includes("deadlock"));
+      expect(concurrencyErrors).toHaveLength(0);
+    });
+
+    it("workflow concurrency is an expression", async () => {
+      const input = `
+on: push
+concurrency: \${{ github.ref }}
+jobs:
+  job1:
+    runs-on: ubuntu-latest
+    concurrency: test
+    steps:
+      - run: echo hi`;
+
+      const result = await validate(createDocument("wf.yaml", input));
+
+      const concurrencyErrors = result.filter(d => d.message.includes("deadlock"));
+      expect(concurrencyErrors).toHaveLength(0);
+    });
+
+    it("job concurrency is an expression", async () => {
+      const input = `
+on: push
+concurrency: test
+jobs:
+  job1:
+    runs-on: ubuntu-latest
+    concurrency: \${{ github.ref }}
+    steps:
+      - run: echo hi`;
+
+      const result = await validate(createDocument("wf.yaml", input));
+
+      const concurrencyErrors = result.filter(d => d.message.includes("deadlock"));
+      expect(concurrencyErrors).toHaveLength(0);
+    });
+
+    it("no workflow-level concurrency", async () => {
+      const input = `
+on: push
+jobs:
+  job1:
+    runs-on: ubuntu-latest
+    concurrency: test
+    steps:
+      - run: echo hi`;
+
+      const result = await validate(createDocument("wf.yaml", input));
+
+      const concurrencyErrors = result.filter(d => d.message.includes("deadlock"));
+      expect(concurrencyErrors).toHaveLength(0);
+    });
+
+    it("no job-level concurrency", async () => {
+      const input = `
+on: push
+concurrency: test
+jobs:
+  job1:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo hi`;
+
+      const result = await validate(createDocument("wf.yaml", input));
+
+      const concurrencyErrors = result.filter(d => d.message.includes("deadlock"));
+      expect(concurrencyErrors).toHaveLength(0);
+    });
+
+    it("case sensitive - different case is different group", async () => {
+      const input = `
+on: push
+concurrency: Test
+jobs:
+  job1:
+    runs-on: ubuntu-latest
+    concurrency: test
+    steps:
+      - run: echo hi`;
+
+      const result = await validate(createDocument("wf.yaml", input));
+
+      const concurrencyErrors = result.filter(d => d.message.includes("deadlock"));
+      expect(concurrencyErrors).toHaveLength(0);
+    });
+
+    it("workflow concurrency group in mapping is an expression", async () => {
+      const input = `
+on: push
+concurrency:
+  group: \${{ github.ref }}
+jobs:
+  job1:
+    runs-on: ubuntu-latest
+    concurrency: test
+    steps:
+      - run: echo hi`;
+
+      const result = await validate(createDocument("wf.yaml", input));
+
+      const concurrencyErrors = result.filter(d => d.message.includes("deadlock"));
+      expect(concurrencyErrors).toHaveLength(0);
+    });
+  });
+});

languageservice/src/validate.expressions.test.ts

@@ -635,7 +635,7 @@ jobs:
         fail-fast: true
         matrix:
           node: [14, 16]
-      uses: ./reusable-workflow-with-inputs.yaml
+      uses: ./.github/workflows/reusable-workflow-with-inputs.yaml
       with:
         username: User-\${{ strategy.fail-fast }}
   `;
@@ -654,7 +654,7 @@ jobs:
       strategy:
         matrix:
           node: [14, 16]
-      uses: ./reusable-workflow-with-inputs.yaml
+      uses: ./.github/workflows/reusable-workflow-with-inputs.yaml
       with:
         username: \${{ matrix.node }}
   `;
@@ -681,7 +681,8 @@ jobs:
 
       const result = await validate(createDocument("wf.yaml", input));
 
-      expect(result).not.toEqual([]);
+      // Strategy context is always available with default values
+      expect(result).toEqual([]);
     });
 
     it("invalid strategy property", async () => {
@@ -996,22 +997,8 @@ jobs:
 
       const result = await validate(createDocument("wf.yaml", input));
 
-      expect(result).toEqual([
+      // Matrix is null when no strategy is defined, accessing properties on null is valid
-        {
+      expect(result).toEqual([]);
-          message: "Context access might be invalid: matrix",
-          range: {
-            end: {
-              character: 36,
-              line: 8
-            },
-            start: {
-              character: 18,
-              line: 8
-            }
-          },
-          severity: DiagnosticSeverity.Warning
-        }
-      ]);
     });
 
     it("basic matrix", async () => {
@@ -1609,6 +1596,48 @@ jobs:
         expect(result).toEqual([]);
       });
 
+      it("allows runner.environment context", async () => {
+        const input = `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - if: runner.environment == 'github-hosted'
+        run: echo hello`;
+
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([]);
+      });
+
+      it("allows runner.debug context", async () => {
+        const input = `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - if: runner.debug == '1'
+        run: echo hello`;
+
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([]);
+      });
+
+      it("allows runner.workspace context", async () => {
+        const input = `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - if: runner.workspace != ''
+        run: echo hello`;
+
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([]);
+      });
+
       it("allows env context", async () => {
         const input = `
 on: push

languageservice/src/validate.incomplete-context.test.ts

@@ -0,0 +1,152 @@
+/**
+ * Test validation behavior when no context providers are configured.
+ *
+ * When contextProviderConfig is not provided (or returns incomplete data),
+ * we should skip validation for secrets/vars rather than showing false
+ * positive "Context access might be invalid" warnings.
+ *
+ * This is important for offline/disconnected scenarios where API calls
+ * to fetch secrets/vars are not possible.
+ */
+
+import {validate} from "./validate";
+import {createDocument} from "./test-utils/document";
+import {clearCache} from "./utils/workflow-cache";
+
+beforeEach(() => {
+  clearCache();
+});
+
+describe("validation without context providers", () => {
+  describe("secrets context", () => {
+    it("should not warn on secrets.GITHUB_TOKEN", async () => {
+      const doc = createDocument(
+        "wf.yaml",
+        `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "test"
+        env:
+          GH_TOKEN: \${{ secrets.GITHUB_TOKEN }}
+`
+      );
+      const result = await validate(doc);
+      expect(result).toEqual([]);
+    });
+
+    it("should not warn on custom secrets when no provider configured", async () => {
+      const doc = createDocument(
+        "wf.yaml",
+        `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "test"
+        env:
+          API_KEY: \${{ secrets.MY_API_KEY }}
+`
+      );
+      const result = await validate(doc);
+      expect(result).toEqual([]);
+    });
+
+    it("should not warn on secrets with environment", async () => {
+      const doc = createDocument(
+        "wf.yaml",
+        `
+on: push
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    environment: production
+    steps:
+      - run: echo "test"
+        env:
+          API_KEY: \${{ secrets.API_KEY }}
+`
+      );
+      const result = await validate(doc);
+      expect(result).toEqual([]);
+    });
+  });
+
+  describe("vars context", () => {
+    it("should not warn on vars when no provider configured", async () => {
+      const doc = createDocument(
+        "wf.yaml",
+        `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "\${{ vars.ENVIRONMENT }}"
+`
+      );
+      const result = await validate(doc);
+      expect(result).toEqual([]);
+    });
+
+    it("should not warn on vars with environment", async () => {
+      const doc = createDocument(
+        "wf.yaml",
+        `
+on: push
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    environment: production
+    steps:
+      - run: echo "\${{ vars.API_URL }}"
+`
+      );
+      const result = await validate(doc);
+      expect(result).toEqual([]);
+    });
+
+    it("should not warn on vars with fallback pattern", async () => {
+      const doc = createDocument(
+        "wf.yaml",
+        `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "\${{ vars.OPTIONAL_VAR || 'default-value' }}"
+`
+      );
+      const result = await validate(doc);
+      expect(result).toEqual([]);
+    });
+  });
+
+  describe("combined secrets and vars", () => {
+    it("should not warn on workflow using both secrets and vars", async () => {
+      const doc = createDocument(
+        "wf.yaml",
+        `
+on: push
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    environment: production
+    steps:
+      - run: |
+          echo "Deploying to \${{ vars.API_URL }}"
+          echo "Using region \${{ vars.AWS_REGION }}"
+        env:
+          API_KEY: \${{ secrets.API_KEY }}
+          AWS_SECRET: \${{ secrets.AWS_SECRET_ACCESS_KEY }}
+`
+      );
+      const result = await validate(doc);
+      expect(result).toEqual([]);
+    });
+  });
+});

languageservice/src/validate.test.ts

@@ -181,7 +181,7 @@ jobs:
 
     expect(result.length).toBe(1);
     expect(result[0]).toEqual({
-      message: "Invalid cron string",
+      message: "Invalid cron expression. Expected format: '* * * * *' (minute hour day month weekday)",
       range: {
         end: {
           character: 21,
@@ -195,6 +195,96 @@ jobs:
     } as Diagnostic);
   });
 
+  it("cron with interval less than 5 minutes shows warning", async () => {
+    const result = await validate(
+      createDocument(
+        "wf.yaml",
+        `on:
+  schedule:
+    - cron: '*/1 * * * *'
+jobs:
+  build:
+    runs-on: ubuntu-latest`
+      ),
+      {valueProviderConfig: defaultValueProviders}
+    );
+
+    expect(result.length).toBe(1);
+    expect(result[0]).toEqual({
+      message:
+        'Actions schedules run at most every 5 minutes. "*/1 * * * *" (runs every minute) will not run as frequently as specified.',
+      severity: DiagnosticSeverity.Warning,
+      code: "on-schedule",
+      codeDescription: {
+        href: "https://docs.github.com/actions/using-workflows/workflow-syntax-for-github-actions#onschedule"
+      },
+      range: {
+        end: {
+          character: 25,
+          line: 2
+        },
+        start: {
+          character: 12,
+          line: 2
+        }
+      }
+    } as Diagnostic);
+  });
+
+  it("cron with interval of 5 minutes or more shows info", async () => {
+    const result = await validate(
+      createDocument(
+        "wf.yaml",
+        `on:
+  schedule:
+    - cron: '*/5 * * * *'
+jobs:
+  build:
+    runs-on: ubuntu-latest`
+      ),
+      {valueProviderConfig: defaultValueProviders}
+    );
+
+    expect(result.length).toBe(1);
+    expect(result[0]).toEqual({
+      message: "Runs every 5 minutes",
+      severity: DiagnosticSeverity.Information,
+      code: "on-schedule",
+      codeDescription: {
+        href: "https://docs.github.com/actions/using-workflows/workflow-syntax-for-github-actions#onschedule"
+      },
+      range: {
+        end: {
+          character: 25,
+          line: 2
+        },
+        start: {
+          character: 12,
+          line: 2
+        }
+      }
+    } as Diagnostic);
+  });
+
+  it("cron with comma-separated minutes less than 5 apart shows warning", async () => {
+    const result = await validate(
+      createDocument(
+        "wf.yaml",
+        `on:
+  schedule:
+    - cron: '0,2 * * * *'
+jobs:
+  build:
+    runs-on: ubuntu-latest`
+      ),
+      {valueProviderConfig: defaultValueProviders}
+    );
+
+    expect(result.length).toBe(1);
+    expect(result[0]?.severity).toBe(DiagnosticSeverity.Warning);
+    expect(result[0]?.message).toContain("Actions schedules run at most every 5 minutes.");
+  });
+
   it("invalid YAML", async () => {
     // This YAML has some mismatched single-quotes, which causes the string to be terminated early
     // within the fromJSON() expression.
@@ -295,4 +385,31 @@ jobs:
       expect(result).toEqual([]);
     });
   });
+
+  describe("workflow_dispatch", () => {
+    it("allows empty string in choice options", async () => {
+      const result = await validate(
+        createDocument(
+          "wf.yaml",
+          `on:
+  workflow_dispatch:
+    inputs:
+      plugin-name:
+        description: Specific plugin to build
+        type: choice
+        options:
+          - ''
+          - foo
+          - bar
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - run: echo`
+        )
+      );
+
+      expect(result).toEqual([]);
+    });
+  });
 });

languageservice/src/validate.ts

@@ -1,7 +1,8 @@
 import {Lexer, Parser, data} from "@actions/expressions";
 import {Expr, FunctionCall, Literal, Logical} from "@actions/expressions/ast";
-import {ParseWorkflowResult, WorkflowTemplate, isBasicExpression, isString} from "@actions/workflow-parser";
+import {ParseWorkflowResult, WorkflowTemplate, isBasicExpression, isMapping, isString} from "@actions/workflow-parser";
 import {ErrorPolicy} from "@actions/workflow-parser/model/convert";
+import {getCronDescription, hasCronIntervalLessThan5Minutes} from "@actions/workflow-parser/model/converter/cron";
 import {ensureStatusFunction} from "@actions/workflow-parser/model/converter/if-condition";
 import {splitAllowedContext} from "@actions/workflow-parser/templates/allowed-context";
 import {BasicExpressionToken} from "@actions/workflow-parser/templates/tokens/basic-expression-token";
@@ -27,6 +28,9 @@ import {validateAction} from "./validate-action";
 import {ValueProviderConfig, ValueProviderKind} from "./value-providers/config";
 import {defaultValueProviders} from "./value-providers/default";
 
+const CRON_SCHEDULE_DOCS_URL =
+  "https://docs.github.com/actions/using-workflows/workflow-syntax-for-github-actions#onschedule";
+
 export type ValidationConfig = {
   valueProviderConfig?: ValueProviderConfig;
   contextProviderConfig?: ContextProviderConfig;
@@ -143,11 +147,34 @@ async function additionalValidations(
       }
     }
 
+    // Validate step uses field format
+    if (isString(token) && token.range && validationDefinition?.key === "step-uses") {
+      validateStepUsesFormat(diagnostics, token);
+    }
+
+    // Validate action metadata (inputs, required fields) for regular steps
     if (token.definition?.key === "regular-step" && token.range) {
       const context = getProviderContext(documentUri, template, root, token.range);
       await validateAction(diagnostics, token, context.step, config);
     }
 
+    // Validate job-level reusable workflow uses field format
+    if (
+      isString(token) &&
+      token.range &&
+      key &&
+      isString(key) &&
+      key.value === "uses" &&
+      parent?.definition?.key === "workflow-job"
+    ) {
+      validateWorkflowUsesFormat(diagnostics, token);
+    }
+
+    // Validate cron expressions - warn if interval is less than 5 minutes
+    if (isString(token) && token.range && validationDefinition?.key === "cron-pattern") {
+      validateCronExpression(diagnostics, token);
+    }
+
     // Allowed values coming from the schema have already been validated. Only check if
     // a value provider is defined for a token and if it is, validate the values match.
     if (token.range && validationDefinition) {
@@ -182,6 +209,9 @@ async function additionalValidations(
       }
     }
   }
+
+  // Validate concurrency deadlock between workflow and job levels
+  validateConcurrencyDeadlock(diagnostics, template);
 }
 
 function invalidValue(diagnostics: Diagnostic[], token: StringToken, kind: ValueProviderKind) {
@@ -198,6 +228,357 @@ function invalidValue(diagnostics: Diagnostic[], token: StringToken, kind: Value
   }
 }
 
+/**
+ * Validates cron expressions and provides diagnostics for valid cron schedules.
+ * Shows a warning if the interval is less than 5 minutes (since GitHub Actions
+ * schedules run at most every 5 minutes), otherwise shows an info message.
+ */
+function validateCronExpression(diagnostics: Diagnostic[], token: StringToken): void {
+  const cronValue = token.value;
+
+  // Ensure we have a range for diagnostics
+  if (!token.range) {
+    return;
+  }
+
+  // Only check valid cron expressions - invalid ones are already caught by the parser
+  const description = getCronDescription(cronValue);
+  if (!description) {
+    return;
+  }
+
+  // Check if the cron specifies an interval less than 5 minutes
+  if (hasCronIntervalLessThan5Minutes(cronValue)) {
+    diagnostics.push({
+      message: `Actions schedules run at most every 5 minutes. "${cronValue}" (${description.toLowerCase()}) will not run as frequently as specified.`,
+      range: mapRange(token.range),
+      severity: DiagnosticSeverity.Warning,
+      code: "on-schedule",
+      codeDescription: {
+        href: CRON_SCHEDULE_DOCS_URL
+      }
+    });
+  } else {
+    // Show info message for valid cron expressions
+    diagnostics.push({
+      message: description,
+      range: mapRange(token.range),
+      severity: DiagnosticSeverity.Information,
+      code: "on-schedule",
+      codeDescription: {
+        href: CRON_SCHEDULE_DOCS_URL
+      }
+    });
+  }
+}
+
+/**
+ * Validates the format of a step's `uses` field.
+ *
+ * Valid formats:
+ * - docker://image:tag
+ * - ./local/path
+ * - .\local\path (Windows)
+ * - {owner}/{repo}@{ref}
+ * - {owner}/{repo}/{path}@{ref}
+ */
+function validateStepUsesFormat(diagnostics: Diagnostic[], token: StringToken): void {
+  const uses = token.value;
+
+  // Empty uses value
+  if (!uses) {
+    diagnostics.push({
+      message: "`uses' value in action cannot be blank",
+      severity: DiagnosticSeverity.Error,
+      range: mapRange(token.range),
+      code: "invalid-uses-format"
+    });
+    return;
+  }
+
+  // Docker image reference - always valid format
+  if (uses.startsWith("docker://")) {
+    return;
+  }
+
+  // Local action path - always valid format
+  if (uses.startsWith("./") || uses.startsWith(".\\")) {
+    return;
+  }
+
+  // Remote action: must be {owner}/{repo}[/path]@{ref}
+  const atSegments = uses.split("@");
+
+  // Must have exactly one @
+  if (atSegments.length !== 2) {
+    addStepUsesFormatError(diagnostics, token);
+    return;
+  }
+
+  const [repoPath, gitRef] = atSegments;
+
+  // Ref cannot be empty
+  if (!gitRef) {
+    addStepUsesFormatError(diagnostics, token);
+    return;
+  }
+
+  // Split by / or \ to get path segments
+  const pathSegments = repoPath.split(/[\\/]/);
+
+  // Must have at least owner and repo (both non-empty)
+  if (pathSegments.length < 2 || !pathSegments[0] || !pathSegments[1]) {
+    addStepUsesFormatError(diagnostics, token);
+    return;
+  }
+
+  // Check if this is a reusable workflow reference (should be at job level, not step)
+  // Path would be like: owner/repo/.github/workflows/file.yml
+  if (pathSegments.length >= 4 && pathSegments[2] === ".github" && pathSegments[3] === "workflows") {
+    diagnostics.push({
+      message: "Reusable workflows should be referenced at the top-level `jobs.<job_id>.uses` key, not within steps",
+      severity: DiagnosticSeverity.Error,
+      range: mapRange(token.range),
+      code: "invalid-uses-format"
+    });
+    return;
+  }
+}
+
+function addStepUsesFormatError(diagnostics: Diagnostic[], token: StringToken): void {
+  diagnostics.push({
+    message: `Expected format {owner}/{repo}[/path]@{ref}. Actual '${token.value}'`,
+    severity: DiagnosticSeverity.Error,
+    range: mapRange(token.range),
+    code: "invalid-uses-format"
+  });
+}
+
+/**
+ * Validates the format of a job's `uses` field (reusable workflow reference).
+ *
+ * Valid formats:
+ * - {owner}/{repo}/.github/workflows/{filename}.yml@{ref}
+ * - {owner}/{repo}/.github/workflows/{filename}.yaml@{ref}
+ * - {owner}/{repo}/.github/workflows-lab/{filename}.yml@{ref}
+ * - {owner}/{repo}/.github/workflows-lab/{filename}.yaml@{ref}
+ * - ./.github/workflows/{filename}.yml
+ * - ./.github/workflows/{filename}.yaml
+ * - ./.github/workflows-lab/{filename}.yml
+ * - ./.github/workflows-lab/{filename}.yaml
+ */
+function validateWorkflowUsesFormat(diagnostics: Diagnostic[], token: StringToken): void {
+  const uses = token.value;
+
+  // Local workflow reference
+  if (uses.startsWith("./.github/workflows/") || uses.startsWith("./.github/workflows-lab/")) {
+    // Cannot have @ version for local workflows
+    if (uses.includes("@")) {
+      addWorkflowUsesFormatError(diagnostics, token, "cannot specify version when calling local workflows");
+      return;
+    }
+
+    // Must have .yml or .yaml extension
+    if (!uses.endsWith(".yml") && !uses.endsWith(".yaml")) {
+      addWorkflowUsesFormatError(
+        diagnostics,
+        token,
+        "workflow file should have either a '.yml' or '.yaml' file extension"
+      );
+      return;
+    }
+
+    // Must be at top level of .github/workflows/ or .github/workflows-lab/ (no subdirectories)
+    const pathParts = uses.split("/");
+    if (pathParts.length !== 4) {
+      // Expected: ".", ".github", "workflows" or "workflows-lab", "filename.yml"
+      addWorkflowUsesFormatError(
+        diagnostics,
+        token,
+        "workflows must be defined at the top level of the .github/workflows/ directory"
+      );
+      return;
+    }
+
+    // Filename cannot be just the extension
+    const filename = pathParts[3];
+    if (filename === ".yml" || filename === ".yaml") {
+      addWorkflowUsesFormatError(diagnostics, token, "invalid workflow file name");
+      return;
+    }
+
+    return;
+  }
+
+  // Malformed local workflow reference (starts with ./ but not in .github/workflows)
+  if (uses.startsWith("./")) {
+    addWorkflowUsesFormatError(diagnostics, token, "local workflow references must be rooted in '.github/workflows'");
+    return;
+  }
+
+  // Remote workflow reference: must have @ for version
+  const atSegments = uses.split("@");
+  if (atSegments.length === 1) {
+    addWorkflowUsesFormatError(diagnostics, token, "no version specified");
+    return;
+  }
+  if (atSegments.length > 2) {
+    addWorkflowUsesFormatError(diagnostics, token, "too many '@' in workflow reference");
+    return;
+  }
+
+  const [pathPart, version] = atSegments;
+
+  // Version cannot be empty
+  if (!version) {
+    addWorkflowUsesFormatError(diagnostics, token, "no version specified");
+    return;
+  }
+
+  // Must contain .github/workflows or .github/workflows-lab path
+  const workflowsMatch = pathPart.match(/\.github\/workflows(-lab)?\//);
+  if (!workflowsMatch || workflowsMatch.index === undefined) {
+    addWorkflowUsesFormatError(diagnostics, token, "references to workflows must be rooted in '.github/workflows'");
+    return;
+  }
+
+  // Split to get owner/repo and path
+  const pathIdx = workflowsMatch.index;
+  const nwoPart = pathPart.substring(0, pathIdx);
+  const workflowPath = pathPart.substring(pathIdx);
+
+  // Validate NWO part: must be owner/repo/
+  const nwoSegments = nwoPart.split("/").filter(s => s.length > 0);
+  if (nwoSegments.length !== 2) {
+    addWorkflowUsesFormatError(
+      diagnostics,
+      token,
+      "references to workflows must be prefixed with format 'owner/repository/' or './' for local workflows"
+    );
+    return;
+  }
+
+  // Validate owner and repo names
+  const [owner, repo] = nwoSegments;
+  const nwoError = validateNWO(owner, repo);
+  if (nwoError) {
+    addWorkflowUsesFormatError(diagnostics, token, nwoError);
+    return;
+  }
+
+  // Validate ref/version format
+  const refError = validateRefName(version);
+  if (refError) {
+    addWorkflowUsesFormatError(diagnostics, token, refError);
+    return;
+  }
+
+  // Validate workflow path is at top level
+  const workflowPathParts = workflowPath.split("/");
+  if (workflowPathParts.length !== 3) {
+    // Expected: ".github", "workflows" or "workflows-lab", "filename.yml"
+    addWorkflowUsesFormatError(
+      diagnostics,
+      token,
+      "workflows must be defined at the top level of the .github/workflows/ directory"
+    );
+    return;
+  }
+
+  // Must have .yml or .yaml extension
+  const filename = workflowPathParts[2];
+  if (!filename.endsWith(".yml") && !filename.endsWith(".yaml")) {
+    addWorkflowUsesFormatError(
+      diagnostics,
+      token,
+      "workflow file should have either a '.yml' or '.yaml' file extension"
+    );
+    return;
+  }
+
+  // Filename cannot be just the extension
+  if (filename === ".yml" || filename === ".yaml") {
+    addWorkflowUsesFormatError(diagnostics, token, "invalid workflow file name");
+    return;
+  }
+}
+
+function addWorkflowUsesFormatError(diagnostics: Diagnostic[], token: StringToken, reason: string): void {
+  diagnostics.push({
+    message: `Invalid workflow reference '${token.value}': ${reason}`,
+    severity: DiagnosticSeverity.Error,
+    range: mapRange(token.range),
+    code: "invalid-workflow-uses-format"
+  });
+}
+
+/**
+ * Validates the git ref/version format.
+ * Based on Launch's ValidateRefName function.
+ */
+function validateRefName(refname: string): string | undefined {
+  if (refname.length === 0) {
+    return "no version specified";
+  }
+
+  // Cannot be the single character '@'
+  if (refname === "@") {
+    return "version cannot be the single character '@'";
+  }
+
+  // Cannot have certain invalid characters or sequences
+  const invalidSequences = ["?", "*", "[", "]", "\\", "~", "^", ":", "@{", "..", "//"];
+  for (const seq of invalidSequences) {
+    if (refname.includes(seq)) {
+      return `invalid character '${seq}' in version`;
+    }
+  }
+
+  // Cannot begin or end with a slash '/' or a dot '.'
+  if (refname.startsWith("/") || refname.endsWith("/") || refname.startsWith(".") || refname.endsWith(".")) {
+    return "version cannot begin or end with a slash '/' or a dot '.'";
+  }
+
+  // No slash-separated component can begin with a dot '.' or end with the sequence '.lock'
+  const components = refname.split("/");
+  for (const component of components) {
+    if (component.startsWith(".") || component.endsWith(".lock")) {
+      return `invalid version: ${refname}`;
+    }
+  }
+
+  // No ASCII control characters or whitespace
+  // eslint-disable-next-line no-control-regex
+  if (/[\x00-\x1f\x7f]/.test(refname)) {
+    return "version cannot have ASCII control characters";
+  }
+
+  if (/\s/.test(refname)) {
+    return "version cannot have whitespace";
+  }
+
+  return undefined;
+}
+
+/**
+ * Validates owner and repository names.
+ * Based on Launch's ValidateNWO function.
+ */
+function validateNWO(owner: string, repo: string): string | undefined {
+  // Owner name: can have word chars, dots, and hyphens
+  // \w in JS regex is [a-zA-Z0-9_]
+  if (!/^[\w.-]+$/.test(owner)) {
+    return "owner name must be a valid repository owner name";
+  }
+
+  // Repository name: can have word chars, dots, and hyphens
+  if (!/^[\w.-]+$/.test(repo)) {
+    return "repository name is invalid";
+  }
+
+  return undefined;
+}
+
 function getProviderContext(
   documentUri: URI,
   template: WorkflowTemplate,
@@ -334,3 +715,71 @@ async function validateExpression(
     );
   }
 }
+
+/**
+ * Validates that workflow-level and job-level concurrency groups don't match,
+ * which would cause a deadlock at runtime.
+ */
+function validateConcurrencyDeadlock(diagnostics: Diagnostic[], template: WorkflowTemplate): void {
+  const workflowGroup = getStaticConcurrencyGroup(template.concurrency);
+  if (!workflowGroup) {
+    return; // No workflow-level concurrency or it's an expression
+  }
+
+  for (const job of template.jobs || []) {
+    if (!job.concurrency) {
+      continue;
+    }
+
+    const jobGroup = getStaticConcurrencyGroup(job.concurrency);
+    if (!jobGroup) {
+      continue; // Job concurrency is an expression
+    }
+
+    if (workflowGroup.value === jobGroup.value) {
+      // Error on workflow-level concurrency
+      if (template.concurrency.range) {
+        diagnostics.push({
+          message: `Concurrency group '${workflowGroup.value}' is also used by job '${job.id.value}'. This will cause a deadlock.`,
+          range: mapRange(template.concurrency.range),
+          severity: DiagnosticSeverity.Error
+        });
+      }
+
+      // Error on job-level concurrency
+      if (job.concurrency.range) {
+        diagnostics.push({
+          message: `Concurrency group '${jobGroup.value}' is also defined at the workflow level. This will cause a deadlock.`,
+          range: mapRange(job.concurrency.range),
+          severity: DiagnosticSeverity.Error
+        });
+      }
+    }
+  }
+}
+
+/**
+ * Extracts the static concurrency group name from a concurrency token.
+ * Returns undefined if the token is an expression or doesn't have a static group.
+ */
+function getStaticConcurrencyGroup(token: TemplateToken | undefined): StringToken | undefined {
+  if (!token || token.isExpression) {
+    return undefined;
+  }
+
+  // Simple string form: concurrency: "test"
+  if (isString(token)) {
+    return token;
+  }
+
+  // Mapping form: concurrency: { group: "test", cancel-in-progress: true }
+  if (isMapping(token)) {
+    for (const pair of token) {
+      if (isString(pair.key) && pair.key.value === "group" && isString(pair.value) && !pair.value.isExpression) {
+        return pair.value;
+      }
+    }
+  }
+
+  return undefined;
+}

languageservice/src/validate.uses-format.test.ts

@@ -0,0 +1,894 @@
+import {DiagnosticSeverity} from "vscode-languageserver-types";
+import {validate} from "./validate";
+import {createDocument} from "./test-utils/document";
+import {clearCache} from "./utils/workflow-cache";
+
+beforeEach(() => {
+  clearCache();
+});
+
+describe("validate uses format", () => {
+  describe("valid formats", () => {
+    it("standard org/repo@ref", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("org/repo with path @ref", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/aws/ec2@main
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("org/repo with deep path @ref", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/aws/nested/deep/path@v1
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("docker image", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: docker://alpine:3.8
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("docker image with registry", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: docker://gcr.io/my-project/my-image:latest
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("local path with ./", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: ./my-action
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("local path with ./ and subdirectories", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: ./.github/actions/my-action
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("local path with .\\ (Windows)", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: .\\my-action
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("SHA ref", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("branch ref", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: owner/repo@feature/my-branch
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+  });
+
+  describe("invalid formats", () => {
+    it("missing @ref", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([
+        {
+          message: "Expected format {owner}/{repo}[/path]@{ref}. Actual 'actions/checkout'",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {line: 5, character: 12},
+            end: {line: 5, character: 28}
+          },
+          code: "invalid-uses-format"
+        }
+      ]);
+    });
+
+    it("empty ref", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([
+        {
+          message: "Expected format {owner}/{repo}[/path]@{ref}. Actual 'actions/checkout@'",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {line: 5, character: 12},
+            end: {line: 5, character: 29}
+          },
+          code: "invalid-uses-format"
+        }
+      ]);
+    });
+
+    it("missing org/owner", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: checkout@v4
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([
+        {
+          message: "Expected format {owner}/{repo}[/path]@{ref}. Actual 'checkout@v4'",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {line: 5, character: 12},
+            end: {line: 5, character: 23}
+          },
+          code: "invalid-uses-format"
+        }
+      ]);
+    });
+
+    it("empty owner", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: /repo@v4
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([
+        {
+          message: "Expected format {owner}/{repo}[/path]@{ref}. Actual '/repo@v4'",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {line: 5, character: 12},
+            end: {line: 5, character: 20}
+          },
+          code: "invalid-uses-format"
+        }
+      ]);
+    });
+
+    it("empty repo", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: owner/@v4
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([
+        {
+          message: "Expected format {owner}/{repo}[/path]@{ref}. Actual 'owner/@v4'",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {line: 5, character: 12},
+            end: {line: 5, character: 21}
+          },
+          code: "invalid-uses-format"
+        }
+      ]);
+    });
+
+    it("multiple @ symbols", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4@extra
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([
+        {
+          message: "Expected format {owner}/{repo}[/path]@{ref}. Actual 'actions/checkout@v4@extra'",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {line: 5, character: 12},
+            end: {line: 5, character: 37}
+          },
+          code: "invalid-uses-format"
+        }
+      ]);
+    });
+
+    it("just a name with no slash", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: checkout
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([
+        {
+          message: "Expected format {owner}/{repo}[/path]@{ref}. Actual 'checkout'",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {line: 5, character: 12},
+            end: {line: 5, character: 20}
+          },
+          code: "invalid-uses-format"
+        }
+      ]);
+    });
+
+    it("empty uses value", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: ""
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toContainEqual({
+        message: "`uses' value in action cannot be blank",
+        severity: DiagnosticSeverity.Error,
+        range: {
+          start: {line: 5, character: 12},
+          end: {line: 5, character: 14}
+        },
+        code: "invalid-uses-format"
+      });
+    });
+
+    it("reusable workflow in step", async () => {
+      const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: owner/repo/.github/workflows/test.yml@main
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([
+        {
+          message:
+            "Reusable workflows should be referenced at the top-level `jobs.<job_id>.uses` key, not within steps",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {line: 5, character: 12},
+            end: {line: 5, character: 54}
+          },
+          code: "invalid-uses-format"
+        }
+      ]);
+    });
+  });
+});
+
+describe("workflow uses format validation", () => {
+  beforeEach(() => {
+    clearCache();
+  });
+
+  describe("valid formats", () => {
+    it("local workflow path", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: ./.github/workflows/test.yml
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("local workflow path with yaml extension", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: ./.github/workflows/test.yaml
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("remote workflow with version", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/test.yml@v1
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("remote workflow with sha ref", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/test.yml@abc123
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("remote workflow with branch ref", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/test.yml@main
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("remote workflow with yaml extension", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/test.yaml@v1
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("local workflows-lab path", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: ./.github/workflows-lab/test.yml
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("local workflows-lab path with yaml extension", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: ./.github/workflows-lab/test.yaml
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+
+    it("remote workflows-lab with version", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows-lab/test.yml@v1
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([]);
+    });
+  });
+
+  describe("invalid formats", () => {
+    it("remote workflow missing version", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/test.yml
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([
+        {
+          message: "Invalid workflow reference 'owner/repo/.github/workflows/test.yml': no version specified",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {line: 3, character: 10},
+            end: {line: 3, character: 47}
+          },
+          code: "invalid-workflow-uses-format"
+        }
+      ]);
+    });
+
+    it("local workflow with version", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: ./.github/workflows/test.yml@v1
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([
+        {
+          message:
+            "Invalid workflow reference './.github/workflows/test.yml@v1': cannot specify version when calling local workflows",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {line: 3, character: 10},
+            end: {line: 3, character: 41}
+          },
+          code: "invalid-workflow-uses-format"
+        }
+      ]);
+    });
+
+    it("malformed local path not in .github/workflows", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: ./foo/bar.yml
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([
+        {
+          message:
+            "Invalid workflow reference './foo/bar.yml': local workflow references must be rooted in '.github/workflows'",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {line: 3, character: 10},
+            end: {line: 3, character: 23}
+          },
+          code: "invalid-workflow-uses-format"
+        }
+      ]);
+    });
+
+    it("missing .github/workflows path", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/test.yml@v1
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([
+        {
+          message:
+            "Invalid workflow reference 'owner/repo/test.yml@v1': references to workflows must be rooted in '.github/workflows'",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {line: 3, character: 10},
+            end: {line: 3, character: 32}
+          },
+          code: "invalid-workflow-uses-format"
+        }
+      ]);
+    });
+
+    it("invalid file extension", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/test.txt@v1
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([
+        {
+          message:
+            "Invalid workflow reference 'owner/repo/.github/workflows/test.txt@v1': workflow file should have either a '.yml' or '.yaml' file extension",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {line: 3, character: 10},
+            end: {line: 3, character: 50}
+          },
+          code: "invalid-workflow-uses-format"
+        }
+      ]);
+    });
+
+    it("no extension", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/test@v1
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([
+        {
+          message:
+            "Invalid workflow reference 'owner/repo/.github/workflows/test@v1': workflow file should have either a '.yml' or '.yaml' file extension",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {line: 3, character: 10},
+            end: {line: 3, character: 46}
+          },
+          code: "invalid-workflow-uses-format"
+        }
+      ]);
+    });
+
+    it("just a ref", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: test.yml@v1
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([
+        {
+          message:
+            "Invalid workflow reference 'test.yml@v1': references to workflows must be rooted in '.github/workflows'",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {line: 3, character: 10},
+            end: {line: 3, character: 21}
+          },
+          code: "invalid-workflow-uses-format"
+        }
+      ]);
+    });
+
+    it("local without .github/workflows", async () => {
+      const input = `on: push
+jobs:
+  test:
+    uses: ./workflows/test.yml
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+      expect(result).toEqual([
+        {
+          message:
+            "Invalid workflow reference './workflows/test.yml': local workflow references must be rooted in '.github/workflows'",
+          severity: DiagnosticSeverity.Error,
+          range: {
+            start: {line: 3, character: 10},
+            end: {line: 3, character: 30}
+          },
+          code: "invalid-workflow-uses-format"
+        }
+      ]);
+    });
+
+    describe("invalid ref/version format", () => {
+      it("empty version after @", async () => {
+        const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/test.yml@
+`;
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([
+          {
+            message: "Invalid workflow reference 'owner/repo/.github/workflows/test.yml@': no version specified",
+            severity: DiagnosticSeverity.Error,
+            range: {
+              start: {line: 3, character: 10},
+              end: {line: 3, character: 48}
+            },
+            code: "invalid-workflow-uses-format"
+          }
+        ]);
+      });
+
+      it("version with invalid character ?", async () => {
+        const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/test.yml@v1?
+`;
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([
+          {
+            message:
+              "Invalid workflow reference 'owner/repo/.github/workflows/test.yml@v1?': invalid character '?' in version",
+            severity: DiagnosticSeverity.Error,
+            range: {
+              start: {line: 3, character: 10},
+              end: {line: 3, character: 51}
+            },
+            code: "invalid-workflow-uses-format"
+          }
+        ]);
+      });
+
+      it("version with double dots", async () => {
+        const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/test.yml@v1..v2
+`;
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([
+          {
+            message:
+              "Invalid workflow reference 'owner/repo/.github/workflows/test.yml@v1..v2': invalid character '..' in version",
+            severity: DiagnosticSeverity.Error,
+            range: {
+              start: {line: 3, character: 10},
+              end: {line: 3, character: 54}
+            },
+            code: "invalid-workflow-uses-format"
+          }
+        ]);
+      });
+
+      it("version ending with dot", async () => {
+        const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/test.yml@v1.
+`;
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([
+          {
+            message:
+              "Invalid workflow reference 'owner/repo/.github/workflows/test.yml@v1.': version cannot begin or end with a slash '/' or a dot '.'",
+            severity: DiagnosticSeverity.Error,
+            range: {
+              start: {line: 3, character: 10},
+              end: {line: 3, character: 51}
+            },
+            code: "invalid-workflow-uses-format"
+          }
+        ]);
+      });
+
+      it("version starting with slash", async () => {
+        const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/test.yml@/v1
+`;
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([
+          {
+            message:
+              "Invalid workflow reference 'owner/repo/.github/workflows/test.yml@/v1': version cannot begin or end with a slash '/' or a dot '.'",
+            severity: DiagnosticSeverity.Error,
+            range: {
+              start: {line: 3, character: 10},
+              end: {line: 3, character: 51}
+            },
+            code: "invalid-workflow-uses-format"
+          }
+        ]);
+      });
+
+      it("version ending with .lock", async () => {
+        const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/test.yml@refs/heads/main.lock
+`;
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([
+          {
+            message:
+              "Invalid workflow reference 'owner/repo/.github/workflows/test.yml@refs/heads/main.lock': invalid version: refs/heads/main.lock",
+            severity: DiagnosticSeverity.Error,
+            range: {
+              start: {line: 3, character: 10},
+              end: {line: 3, character: 68}
+            },
+            code: "invalid-workflow-uses-format"
+          }
+        ]);
+      });
+
+      it("version with whitespace", async () => {
+        const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/test.yml@v1 && rm -rf
+`;
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([
+          {
+            message:
+              "Invalid workflow reference 'owner/repo/.github/workflows/test.yml@v1 && rm -rf': version cannot have whitespace",
+            severity: DiagnosticSeverity.Error,
+            range: {
+              start: {line: 3, character: 10},
+              end: {line: 3, character: 60}
+            },
+            code: "invalid-workflow-uses-format"
+          }
+        ]);
+      });
+
+      it("version with backslash", async () => {
+        const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/test.yml@v1\\1
+`;
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([
+          {
+            message:
+              "Invalid workflow reference 'owner/repo/.github/workflows/test.yml@v1\\1': invalid character '\\' in version",
+            severity: DiagnosticSeverity.Error,
+            range: {
+              start: {line: 3, character: 10},
+              end: {line: 3, character: 52}
+            },
+            code: "invalid-workflow-uses-format"
+          }
+        ]);
+      });
+    });
+
+    describe("invalid owner/repo names", () => {
+      it("owner with invalid characters", async () => {
+        const input = `on: push
+jobs:
+  test:
+    uses: owner*/repo/.github/workflows/test.yml@v1
+`;
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([
+          {
+            message:
+              "Invalid workflow reference 'owner*/repo/.github/workflows/test.yml@v1': owner name must be a valid repository owner name",
+            severity: DiagnosticSeverity.Error,
+            range: {
+              start: {line: 3, character: 10},
+              end: {line: 3, character: 51}
+            },
+            code: "invalid-workflow-uses-format"
+          }
+        ]);
+      });
+
+      it("repo with invalid characters", async () => {
+        const input = `on: push
+jobs:
+  test:
+    uses: owner/repo!name/.github/workflows/test.yml@v1
+`;
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([
+          {
+            message:
+              "Invalid workflow reference 'owner/repo!name/.github/workflows/test.yml@v1': repository name is invalid",
+            severity: DiagnosticSeverity.Error,
+            range: {
+              start: {line: 3, character: 10},
+              end: {line: 3, character: 55}
+            },
+            code: "invalid-workflow-uses-format"
+          }
+        ]);
+      });
+
+      it("owner with spaces", async () => {
+        const input = `on: push
+jobs:
+  test:
+    uses: owner name/repo/.github/workflows/test.yml@v1
+`;
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([
+          {
+            message:
+              "Invalid workflow reference 'owner name/repo/.github/workflows/test.yml@v1': owner name must be a valid repository owner name",
+            severity: DiagnosticSeverity.Error,
+            range: {
+              start: {line: 3, character: 10},
+              end: {line: 3, character: 55}
+            },
+            code: "invalid-workflow-uses-format"
+          }
+        ]);
+      });
+    });
+
+    describe("invalid workflow filename", () => {
+      it("filename is just .yml", async () => {
+        const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/.yml@v1
+`;
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([
+          {
+            message: "Invalid workflow reference 'owner/repo/.github/workflows/.yml@v1': invalid workflow file name",
+            severity: DiagnosticSeverity.Error,
+            range: {
+              start: {line: 3, character: 10},
+              end: {line: 3, character: 46}
+            },
+            code: "invalid-workflow-uses-format"
+          }
+        ]);
+      });
+
+      it("filename is just .yaml", async () => {
+        const input = `on: push
+jobs:
+  test:
+    uses: owner/repo/.github/workflows/.yaml@v1
+`;
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([
+          {
+            message: "Invalid workflow reference 'owner/repo/.github/workflows/.yaml@v1': invalid workflow file name",
+            severity: DiagnosticSeverity.Error,
+            range: {
+              start: {line: 3, character: 10},
+              end: {line: 3, character: 47}
+            },
+            code: "invalid-workflow-uses-format"
+          }
+        ]);
+      });
+
+      it("local workflow filename is just .yml", async () => {
+        const input = `on: push
+jobs:
+  test:
+    uses: ./.github/workflows/.yml
+`;
+        const result = await validate(createDocument("wf.yaml", input));
+        expect(result).toEqual([
+          {
+            message: "Invalid workflow reference './.github/workflows/.yml': invalid workflow file name",
+            severity: DiagnosticSeverity.Error,
+            range: {
+              start: {line: 3, character: 10},
+              end: {line: 3, character: 34}
+            },
+            code: "invalid-workflow-uses-format"
+          }
+        ]);
+      });
+    });
+  });
+});

languageservice/src/validate.workflow-references.test.ts

@@ -43,7 +43,7 @@ on: push
 
 jobs:
   build:
-    uses: monalisa/octocat/workflow.yaml@not-a-branch
+    uses: monalisa/octocat/.github/workflows/workflow.yaml@not-a-branch
 `;
     const result = await validate(createDocument("wf.yaml", input), {
       fileProvider: testFileProvider
@@ -58,7 +58,7 @@ jobs:
             line: 5
           },
           end: {
-            character: 53,
+            character: 71,
             line: 5
           }
         }
@@ -72,7 +72,7 @@ on: push
 
 jobs:
   build:
-    uses: monalisa/octocat/workflow.yaml@main
+    uses: monalisa/octocat/.github/workflows/workflow.yaml@main
 `;
     const result = await validate(createDocument("wf.yaml", input), {
       fileProvider: testFileProvider
@@ -87,7 +87,7 @@ on: push
 
 jobs:
   build:
-    uses: ./reusable-workflow.yaml
+    uses: ./.github/workflows/reusable-workflow.yaml
 `;
     const result = await validate(createDocument("wf.yaml", input), {
       fileProvider: testFileProvider
@@ -102,7 +102,7 @@ on: push
 
 jobs:
   build:
-    uses: ./reusable-workflow-with-inputs.yaml
+    uses: ./.github/workflows/reusable-workflow-with-inputs.yaml
     secrets:
       envPAT: pat
 `;
@@ -119,7 +119,7 @@ jobs:
             line: 5
           },
           end: {
-            character: 46,
+            character: 64,
             line: 5
           }
         }
@@ -133,7 +133,7 @@ on: push
 
 jobs:
   build:
-    uses: ./reusable-workflow-with-inputs.yaml
+    uses: ./.github/workflows/reusable-workflow-with-inputs.yaml
     with:
       username: monalisa
     secrets:

languageservice/src/validate.yaml-anchors.test.ts

@@ -0,0 +1,202 @@
+import {validate} from "./validate";
+import {createDocument} from "./test-utils/document";
+import {clearCache} from "./utils/workflow-cache";
+
+beforeEach(() => {
+  clearCache();
+});
+
+describe("YAML anchors and aliases", () => {
+  it("should handle anchors and aliases in env", async () => {
+    const doc = createDocument(
+      "wf.yaml",
+      `
+on: push
+jobs:
+  job1:
+    runs-on: ubuntu-latest
+    env: &env
+      ENV1: env1
+      ENV2: env2
+    steps:
+      - run: exit 0
+  job2:
+    runs-on: ubuntu-latest
+    env: *env
+    steps:
+      - run: exit 0
+`
+    );
+    const result = await validate(doc);
+    expect(result).toEqual([]);
+  });
+
+  it("should handle multiple aliases to the same anchor", async () => {
+    const doc = createDocument(
+      "wf.yaml",
+      `
+on: push
+env: &shared
+  SHARED: true
+jobs:
+  job1:
+    runs-on: ubuntu-latest
+    env: *shared
+    steps:
+      - run: exit 0
+  job2:
+    runs-on: ubuntu-latest
+    env: *shared
+    steps:
+      - run: exit 0
+  job3:
+    runs-on: ubuntu-latest
+    env: *shared
+    steps:
+      - run: exit 0
+`
+    );
+    const result = await validate(doc);
+    expect(result).toEqual([]);
+  });
+
+  it("should handle anchors in matrix strategy", async () => {
+    const doc = createDocument(
+      "wf.yaml",
+      `
+on: push
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include: &matrix-include
+          - os: ubuntu-latest
+            node: 18
+          - os: windows-latest
+            node: 20
+    steps:
+      - run: exit 0
+  test2:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include: *matrix-include
+    steps:
+      - run: exit 0
+`
+    );
+    const result = await validate(doc);
+    expect(result).toEqual([]);
+  });
+
+  it("should handle anchors in steps", async () => {
+    const doc = createDocument(
+      "wf.yaml",
+      `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - &checkout
+        uses: actions/checkout@v4
+      - run: npm test
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - *checkout
+      - run: npm run deploy
+`
+    );
+    const result = await validate(doc);
+    expect(result).toEqual([]);
+  });
+
+  it("should handle scalar anchors", async () => {
+    const doc = createDocument(
+      "wf.yaml",
+      `
+on: push
+jobs:
+  build:
+    runs-on: &runner ubuntu-latest
+    steps:
+      - run: exit 0
+  test:
+    runs-on: *runner
+    steps:
+      - run: exit 0
+`
+    );
+    const result = await validate(doc);
+    expect(result).toEqual([]);
+  });
+
+  it("should work without anchors (control test)", async () => {
+    const doc = createDocument(
+      "wf.yaml",
+      `
+on: push
+jobs:
+  job1:
+    runs-on: ubuntu-latest
+    env:
+      ENV1: env1
+      ENV2: env2
+    steps:
+      - run: exit 0
+  job2:
+    runs-on: ubuntu-latest
+    env:
+      ENV1: env1
+      ENV2: env2
+    steps:
+      - run: exit 0
+`
+    );
+    const result = await validate(doc);
+    expect(result).toEqual([]);
+  });
+
+  it("should handle circular aliases without hanging", async () => {
+    // This is an invalid use case (alias referencing parent) but should not hang
+    const doc = createDocument(
+      "wf.yaml",
+      `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env: &myenv
+      FOO: bar
+      nested: *myenv
+    steps:
+      - run: exit 0
+`
+    );
+    // Should complete without hanging - circular portion is silently ignored
+    // which may cause downstream validation errors, but that's acceptable
+    const result = await validate(doc);
+    expect(result).toBeDefined();
+  });
+
+  it("should handle undefined alias references", async () => {
+    // Reference to non-existent anchor - yaml library should report error
+    const doc = createDocument(
+      "wf.yaml",
+      `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env: *nonexistent
+    steps:
+      - run: exit 0
+`
+    );
+    const result = await validate(doc);
+    expect(result).toBeDefined();
+    expect(result.length).toBeGreaterThan(0);
+  });
+});

lerna.json

@@ -6,5 +6,5 @@
     "languageservice",
     "languageserver"
   ],
-  "version": "0.3.20"
+  "version": "0.3.25"
 }

package-lock.json

@@ -135,7 +135,7 @@
     },
     "expressions": {
       "name": "@actions/expressions",
-      "version": "0.3.20",
+      "version": "0.3.25",
       "license": "MIT",
       "devDependencies": {
         "@types/jest": "^29.0.3",
@@ -151,7 +151,7 @@
         "typescript": "^4.7.4"
       },
       "engines": {
-        "node": ">= 16.15"
+        "node": ">= 18"
       }
     },
     "expressions/node_modules/@eslint/eslintrc": {
@@ -340,9 +340,9 @@
       }
     },
     "expressions/node_modules/js-yaml": {
-      "version": "4.1.0",
+      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.1.tgz",
-      "integrity": "sha512-wpxZs9NoxZaJESJGIZTyDEaYpl0FKSA+FB9aJiyemKhMwkxQg63h4T1KJgUGHpTqPDNRcmmYLugrRjJlBtWvRA==",
+      "integrity": "sha512-qQKT4zQxXl8lLwBtHMWwaTcGfFOZviOJet3Oy/xmGk2gZH677CJM9EvtfdSkgWcATZhj/55JZ0rmy3myCT5lsA==",
       "dev": true,
       "dependencies": {
         "argparse": "^2.0.1"
@@ -395,11 +395,11 @@
     },
     "languageserver": {
       "name": "@actions/languageserver",
-      "version": "0.3.20",
+      "version": "0.3.25",
       "license": "MIT",
       "dependencies": {
-        "@actions/languageservice": "^0.3.20",
+        "@actions/languageservice": "^0.3.25",
-        "@actions/workflow-parser": "^0.3.20",
+        "@actions/workflow-parser": "^0.3.25",
         "@octokit/rest": "^21.1.1",
         "@octokit/types": "^9.0.0",
         "vscode-languageserver": "^8.0.2",
@@ -421,7 +421,7 @@
         "typescript": "^4.8.4"
       },
       "engines": {
-        "node": ">= 16.15"
+        "node": ">= 18"
       }
     },
     "languageserver/node_modules/@eslint/eslintrc": {
@@ -921,11 +921,11 @@
     },
     "languageservice": {
       "name": "@actions/languageservice",
-      "version": "0.3.20",
+      "version": "0.3.25",
       "license": "MIT",
       "dependencies": {
-        "@actions/expressions": "^0.3.20",
+        "@actions/expressions": "^0.3.25",
-        "@actions/workflow-parser": "^0.3.20",
+        "@actions/workflow-parser": "^0.3.25",
         "vscode-languageserver-textdocument": "^1.0.7",
         "vscode-languageserver-types": "^3.17.2",
         "vscode-uri": "^3.0.8",
@@ -947,7 +947,7 @@
         "typescript": "^4.8.4"
       },
       "engines": {
-        "node": ">= 16.15"
+        "node": ">= 18"
       }
     },
     "languageservice/node_modules/@eslint/eslintrc": {
@@ -1136,9 +1136,9 @@
       }
     },
     "languageservice/node_modules/js-yaml": {
-      "version": "4.1.0",
+      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.1.tgz",
-      "integrity": "sha512-wpxZs9NoxZaJESJGIZTyDEaYpl0FKSA+FB9aJiyemKhMwkxQg63h4T1KJgUGHpTqPDNRcmmYLugrRjJlBtWvRA==",
+      "integrity": "sha512-qQKT4zQxXl8lLwBtHMWwaTcGfFOZviOJet3Oy/xmGk2gZH677CJM9EvtfdSkgWcATZhj/55JZ0rmy3myCT5lsA==",
       "dev": true,
       "dependencies": {
         "argparse": "^2.0.1"
@@ -1218,89 +1218,19 @@
       }
     },
     "node_modules/@babel/code-frame": {
-      "version": "7.22.13",
+      "version": "7.27.1",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.22.13.tgz",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.27.1.tgz",
-      "integrity": "sha512-XktuhWlJ5g+3TJXc5upd9Ks1HutSArik6jf2eAjYFyIOf4ej3RN+184cZbzDvbPnuTJIUhPKKJE3cIsYTiAT3w==",
+      "integrity": "sha512-cjQ7ZlQ0Mv3b47hABuTevyTuYN4i+loJKGeV9flcCgIK37cCXRh+L1bd3iBHlynerhQ7BhCkn2BPbQUL+rGqFg==",
       "dev": true,
       "dependencies": {
-        "@babel/highlight": "^7.22.13",
+        "@babel/helper-validator-identifier": "^7.27.1",
-        "chalk": "^2.4.2"
+        "js-tokens": "^4.0.0",
+        "picocolors": "^1.1.1"
       },
       "engines": {
         "node": ">=6.9.0"
       }
     },
-    "node_modules/@babel/code-frame/node_modules/ansi-styles": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
-      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
-      "dev": true,
-      "dependencies": {
-        "color-convert": "^1.9.0"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
-    "node_modules/@babel/code-frame/node_modules/chalk": {
-      "version": "2.4.2",
-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
-      "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
-      "dev": true,
-      "dependencies": {
-        "ansi-styles": "^3.2.1",
-        "escape-string-regexp": "^1.0.5",
-        "supports-color": "^5.3.0"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
-    "node_modules/@babel/code-frame/node_modules/color-convert": {
-      "version": "1.9.3",
-      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
-      "integrity": "sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==",
-      "dev": true,
-      "dependencies": {
-        "color-name": "1.1.3"
-      }
-    },
-    "node_modules/@babel/code-frame/node_modules/color-name": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
-      "integrity": "sha512-72fSenhMw2HZMTVHeCA9KCmpEIbzWiQsjN+BHcBbS9vr1mtt+vJjPdksIBNUmKAW8TFUDPJK5SUU3QhE9NEXDw==",
-      "dev": true
-    },
-    "node_modules/@babel/code-frame/node_modules/escape-string-regexp": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
-      "integrity": "sha512-vbRorB5FUQWvla16U8R/qgaFIya2qGzwDrNmCZuYKrbdSUMG6I1ZCGQRefkRVhuOkIGVne7BQ35DSfo1qvJqFg==",
-      "dev": true,
-      "engines": {
-        "node": ">=0.8.0"
-      }
-    },
-    "node_modules/@babel/code-frame/node_modules/has-flag": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
-      "integrity": "sha512-sKJf1+ceQBr4SMkvQnBDNDtf4TXpVhVGateu0t918bl30FnbE2m4vNLX+VWe/dpjlb+HugGYzW7uQXH98HPEYw==",
-      "dev": true,
-      "engines": {
-        "node": ">=4"
-      }
-    },
-    "node_modules/@babel/code-frame/node_modules/supports-color": {
-      "version": "5.5.0",
-      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
-      "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
-      "dev": true,
-      "dependencies": {
-        "has-flag": "^3.0.0"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
     "node_modules/@babel/compat-data": {
       "version": "7.20.1",
       "dev": true,
@@ -1483,18 +1413,18 @@
       }
     },
     "node_modules/@babel/helper-string-parser": {
-      "version": "7.22.5",
+      "version": "7.27.1",
-      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.22.5.tgz",
+      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.27.1.tgz",
-      "integrity": "sha512-mM4COjgZox8U+JcXQwPijIZLElkgEpO5rsERVDJTc2qfCDfERyob6k5WegS14SX18IIjv+XD+GrqNumY5JRCDw==",
+      "integrity": "sha512-qMlSxKbpRlAridDExk92nSobyDdpPijUq2DW6oDnUqd0iOGxmQjyqhMIihI9+zv4LPyZdRje2cavWPbCbWm3eA==",
       "dev": true,
       "engines": {
         "node": ">=6.9.0"
       }
     },
     "node_modules/@babel/helper-validator-identifier": {
-      "version": "7.22.20",
+      "version": "7.28.5",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.22.20.tgz",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.28.5.tgz",
-      "integrity": "sha512-Y4OZ+ytlatR8AI+8KZfKuL5urKp7qey08ha31L8b3BwewJAoJamTzyvxPR/5D+KkdJCGPq/+8TukHBlY10FX9A==",
+      "integrity": "sha512-qSs4ifwzKJSV39ucNjsvc6WVHs6b7S03sOh2OcHF9UHfVPqWWALUsNUVzhSBiItjRZoLHx7nIarVjqKVusUZ1Q==",
       "dev": true,
       "engines": {
         "node": ">=6.9.0"
@@ -1509,13 +1439,13 @@
       }
     },
     "node_modules/@babel/helpers": {
-      "version": "7.20.1",
+      "version": "7.28.4",
+      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.28.4.tgz",
+      "integrity": "sha512-HFN59MmQXGHVyYadKLVumYsA9dBFun/ldYxipEjzA4196jpLZd8UjEEBLkbEkvfYreDqJhZxYAWFPtrfhNpj4w==",
       "dev": true,
-      "license": "MIT",
       "dependencies": {
-        "@babel/template": "^7.18.10",
+        "@babel/template": "^7.27.2",
-        "@babel/traverse": "^7.20.1",
+        "@babel/types": "^7.28.4"
-        "@babel/types": "^7.20.0"
       },
       "engines": {
         "node": ">=6.9.0"
@@ -1600,10 +1530,13 @@
       }
     },
     "node_modules/@babel/parser": {
-      "version": "7.23.0",
+      "version": "7.28.5",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.23.0.tgz",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.28.5.tgz",
-      "integrity": "sha512-vvPKKdMemU85V9WE/l5wZEmImpCtLqbnTvqDS2U1fJ96KrxoW7KrXhNsNCblQlg8Ck4b85yxdTyelsMUgFUXiw==",
+      "integrity": "sha512-KKBU1VGYR7ORr3At5HAtUQ+TV3SzRCXmA/8OdDZiLDBIZxVyzXuztPjfLd3BV1PRAQGCMWWSHYhL0F8d5uHBDQ==",
       "dev": true,
+      "dependencies": {
+        "@babel/types": "^7.28.5"
+      },
       "bin": {
         "parser": "bin/babel-parser.js"
       },
@@ -1786,14 +1719,14 @@
       }
     },
     "node_modules/@babel/template": {
-      "version": "7.22.15",
+      "version": "7.27.2",
-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.22.15.tgz",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.27.2.tgz",
-      "integrity": "sha512-QPErUVm4uyJa60rkI73qneDacvdvzxshT3kksGqlGWYdOTIUOwJ7RDUL8sGqslY1uXWSL6xMFKEXDS3ox2uF0w==",
+      "integrity": "sha512-LPDZ85aEJyYSd18/DkjNh4/y1ntkE5KwUHWTiqgRxruuZL2F1yuHligVHLvcHY2vMHXttKFpJn6LwfI7cw7ODw==",
       "dev": true,
       "dependencies": {
-        "@babel/code-frame": "^7.22.13",
+        "@babel/code-frame": "^7.27.1",
-        "@babel/parser": "^7.22.15",
+        "@babel/parser": "^7.27.2",
-        "@babel/types": "^7.22.15"
+        "@babel/types": "^7.27.1"
       },
       "engines": {
         "node": ">=6.9.0"
@@ -1821,14 +1754,13 @@
       }
     },
     "node_modules/@babel/types": {
-      "version": "7.23.0",
+      "version": "7.28.5",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.23.0.tgz",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.28.5.tgz",
-      "integrity": "sha512-0oIyUfKoI3mSqMvsxBdclDwxXKXAUA8v/apZbc+iSyARYou1o8ZGDxbUYyLFoW2arqS2jDGqJuZvv1d/io1axg==",
+      "integrity": "sha512-qQ5m48eI/MFLQ5PxQj4PFaprjyCTLI37ElWMmNs0K8Lk3dVeOdNpB3ks8jc7yM5CDmVC73eMVk/trk3fgmrUpA==",
       "dev": true,
       "dependencies": {
-        "@babel/helper-string-parser": "^7.22.5",
+        "@babel/helper-string-parser": "^7.27.1",
-        "@babel/helper-validator-identifier": "^7.22.20",
+        "@babel/helper-validator-identifier": "^7.28.5"
-        "to-fast-properties": "^2.0.0"
       },
       "engines": {
         "node": ">=6.9.0"
@@ -4231,12 +4163,10 @@
       }
     },
     "node_modules/@typescript-eslint/eslint-plugin/node_modules/semver": {
-      "version": "7.3.8",
+      "version": "7.7.3",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.3.tgz",
+      "integrity": "sha512-SdsKMrI9TdgjdweUSR9MweHA4EJ8YxHn8DFaDisvhVlUOe4BF1tLD7GAj0lIqWVl+dPb/rExr0Btby5loQm20Q==",
       "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "lru-cache": "^6.0.0"
-      },
       "bin": {
         "semver": "bin/semver.js"
       },
@@ -4361,12 +4291,10 @@
       }
     },
     "node_modules/@typescript-eslint/typescript-estree/node_modules/semver": {
-      "version": "7.3.8",
+      "version": "7.7.3",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.3.tgz",
+      "integrity": "sha512-SdsKMrI9TdgjdweUSR9MweHA4EJ8YxHn8DFaDisvhVlUOe4BF1tLD7GAj0lIqWVl+dPb/rExr0Btby5loQm20Q==",
       "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "lru-cache": "^6.0.0"
-      },
       "bin": {
         "semver": "bin/semver.js"
       },
@@ -4402,12 +4330,10 @@
       }
     },
     "node_modules/@typescript-eslint/utils/node_modules/semver": {
-      "version": "7.3.8",
+      "version": "7.7.3",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.3.tgz",
+      "integrity": "sha512-SdsKMrI9TdgjdweUSR9MweHA4EJ8YxHn8DFaDisvhVlUOe4BF1tLD7GAj0lIqWVl+dPb/rExr0Btby5loQm20Q==",
       "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "lru-cache": "^6.0.0"
-      },
       "bin": {
         "semver": "bin/semver.js"
       },
@@ -4877,9 +4803,10 @@
       }
     },
     "node_modules/brace-expansion": {
-      "version": "1.1.11",
+      "version": "1.1.12",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.12.tgz",
+      "integrity": "sha512-9T9UjW3r0UW5c1Q7GTwllptXwhvYmEzFhzMfZ9H7FQWt+uZePjZPjBP/W1ZEyZ1twGWom5/56TF4lPcqjnDHcg==",
       "dev": true,
-      "license": "MIT",
       "dependencies": {
         "balanced-match": "^1.0.0",
         "concat-map": "0.0.1"
@@ -6265,12 +6192,10 @@
       }
     },
     "node_modules/eslint/node_modules/semver": {
-      "version": "7.3.8",
+      "version": "7.7.3",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.3.tgz",
+      "integrity": "sha512-SdsKMrI9TdgjdweUSR9MweHA4EJ8YxHn8DFaDisvhVlUOe4BF1tLD7GAj0lIqWVl+dPb/rExr0Btby5loQm20Q==",
       "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "lru-cache": "^6.0.0"
-      },
       "bin": {
         "semver": "bin/semver.js"
       },
@@ -8392,12 +8317,10 @@
       }
     },
     "node_modules/jest-snapshot/node_modules/semver": {
-      "version": "7.3.8",
+      "version": "7.7.3",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.3.tgz",
+      "integrity": "sha512-SdsKMrI9TdgjdweUSR9MweHA4EJ8YxHn8DFaDisvhVlUOe4BF1tLD7GAj0lIqWVl+dPb/rExr0Btby5loQm20Q==",
       "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "lru-cache": "^6.0.0"
-      },
       "bin": {
         "semver": "bin/semver.js"
       },
@@ -8510,9 +8433,10 @@
       "license": "MIT"
     },
     "node_modules/js-yaml": {
-      "version": "3.14.1",
+      "version": "3.14.2",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.14.2.tgz",
+      "integrity": "sha512-PMSmkqxr106Xa156c2M265Z+FTrPl+oxd/rgOQy2tijQeK5TxQ43psO1ZCwhVOSdnn+RzkzlRz/eY4BgJBYVpg==",
       "dev": true,
-      "license": "MIT",
       "dependencies": {
         "argparse": "^1.0.7",
         "esprima": "^4.0.0"
@@ -9514,11 +9438,12 @@
       }
     },
     "node_modules/micromatch": {
-      "version": "4.0.5",
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-4.0.8.tgz",
+      "integrity": "sha512-PXwfBhYu0hBCPw8Dn0E+WDYb7af3dSLVWKi3HGv84IdF4TyFoC0ysxFd0Goxw7nSv4T/PzEJQxsYsEiFCKo2BA==",
       "dev": true,
-      "license": "MIT",
       "dependencies": {
-        "braces": "^3.0.2",
+        "braces": "^3.0.3",
         "picomatch": "^2.3.1"
       },
       "engines": {
@@ -10760,9 +10685,10 @@
       }
     },
     "node_modules/picocolors": {
-      "version": "1.0.0",
+      "version": "1.1.1",
-      "dev": true,
+      "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",
-      "license": "ISC"
+      "integrity": "sha512-xceH2snhtb5M9liqDsmEw56le376mTZkEX/jEb/RxNFyegNul7eNslCXP9FDj/Lcu0X8KEyMceP2ntpaHrDEVA==",
+      "dev": true
     },
     "node_modules/picomatch": {
       "version": "2.3.1",
@@ -11524,9 +11450,10 @@
       "license": "MIT"
     },
     "node_modules/semver": {
-      "version": "6.3.0",
+      "version": "6.3.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
+      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
       "dev": true,
-      "license": "ISC",
       "bin": {
         "semver": "bin/semver.js"
       }
@@ -12147,14 +12074,6 @@
       "dev": true,
       "license": "BSD-3-Clause"
     },
-    "node_modules/to-fast-properties": {
-      "version": "2.0.0",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=4"
-      }
-    },
     "node_modules/to-regex-range": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
@@ -12235,12 +12154,10 @@
       }
     },
     "node_modules/ts-jest/node_modules/semver": {
-      "version": "7.3.8",
+      "version": "7.7.3",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.3.tgz",
+      "integrity": "sha512-SdsKMrI9TdgjdweUSR9MweHA4EJ8YxHn8DFaDisvhVlUOe4BF1tLD7GAj0lIqWVl+dPb/rExr0Btby5loQm20Q==",
       "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "lru-cache": "^6.0.0"
-      },
       "bin": {
         "semver": "bin/semver.js"
       },
@@ -12917,10 +12834,10 @@
     },
     "workflow-parser": {
       "name": "@actions/workflow-parser",
-      "version": "0.3.20",
+      "version": "0.3.25",
       "license": "MIT",
       "dependencies": {
-        "@actions/expressions": "^0.3.20",
+        "@actions/expressions": "^0.3.25",
         "cronstrue": "^2.21.0",
         "yaml": "^2.0.0-8"
       },
@@ -12938,7 +12855,7 @@
         "typescript": "^4.8.4"
       },
       "engines": {
-        "node": ">= 16.15"
+        "node": ">= 18"
       }
     }
   }

package.json

@@ -1,6 +1,7 @@
 {
   "name": "actions-languageservices",
   "private": true,
+  "type": "module",
   "workspaces": [
     "./expressions",
     "./workflow-parser",

script/minify-json.js

@@ -0,0 +1,43 @@
+#!/usr/bin/env node
+
+/**
+ * Minifies JSON files by removing whitespace.
+ *
+ * Usage: node script/minify-json.js <file1.json> <file2.json> ...
+ *
+ * For each input file, creates a corresponding .min.json file.
+ * Example: src/data.json -> src/data.min.json
+ */
+
+import {promises as fs} from "fs";
+import path from "path";
+
+const files = process.argv.slice(2);
+
+if (files.length === 0) {
+  console.error("Usage: node script/minify-json.js <file1.json> <file2.json> ...");
+  process.exit(1);
+}
+
+for (const file of files) {
+  try {
+    const content = await fs.readFile(file, "utf8");
+    const data = JSON.parse(content);
+    const minified = JSON.stringify(data);
+
+    // Replace .json with .min.json
+    const ext = path.extname(file);
+    const outputFile = file.slice(0, -ext.length) + ".min" + ext;
+
+    await fs.writeFile(outputFile, minified);
+
+    const originalSize = Buffer.byteLength(content, "utf8");
+    const minifiedSize = Buffer.byteLength(minified, "utf8");
+    const savings = ((1 - minifiedSize / originalSize) * 100).toFixed(1);
+
+    console.log(`${file} -> ${outputFile} (${savings}% smaller)`);
+  } catch (err) {
+    console.error(`Error processing ${file}:`, err);
+    process.exit(1);
+  }
+}

workflow-parser/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@actions/workflow-parser",
-  "version": "0.3.20",
+  "version": "0.3.25",
   "license": "MIT",
   "type": "module",
   "source": "./src/index.ts",
@@ -38,19 +38,22 @@
     "format-check": "prettier --check '**/*.ts'",
     "lint": "eslint 'src/**/*.ts'",
     "lint-fix": "eslint --fix 'src/**/*.ts'",
+    "minify-json": "node ../script/minify-json.js src/workflow-v1.0.json",
+    "prebuild": "npm run minify-json",
     "prepublishOnly": "npm run build && npm run test",
+    "pretest": "npm run minify-json",
     "test": "NODE_OPTIONS=\"--experimental-vm-modules\" jest",
     "test-xlang": "NODE_OPTIONS=\"--experimental-vm-modules\" jest --testPathPattern xlang",
     "test-watch": "NODE_OPTIONS=\"--experimental-vm-modules\" jest --watch",
     "watch": "tsc --build tsconfig.build.json --watch"
   },
   "dependencies": {
-    "@actions/expressions": "^0.3.20",
+    "@actions/expressions": "^0.3.25",
     "cronstrue": "^2.21.0",
     "yaml": "^2.0.0-8"
   },
   "engines": {
-    "node": ">= 16.15"
+    "node": ">= 18"
   },
   "files": [
     "dist/**/*"

workflow-parser/src/model/converter/cron.test.ts

@@ -1,4 +1,4 @@
-import {isValidCron, getCronDescription} from "./cron";
+import {isValidCron, getCronDescription, hasCronIntervalLessThan5Minutes} from "./cron";
 
 describe("cron", () => {
   describe("valid cron", () => {
@@ -66,14 +66,54 @@ describe("cron", () => {
 
   describe("getCronDescription", () => {
     it(`Produces a sentence for valid cron`, () => {
-      expect(getCronDescription("0 * * * *")).toEqual(
+      expect(getCronDescription("0 * * * *")).toEqual("Runs every hour");
-        "Runs every hour\n\n" +
-          "Actions schedules run at most every 5 minutes. [Learn more](https://docs.github.com/actions/using-workflows/workflow-syntax-for-github-actions#onschedule)"
-      );
     });
 
     it(`Returns nothing for invalid cron`, () => {
       expect(getCronDescription("* * * * * *")).toBeUndefined();
     });
   });
+
+  describe("hasCronIntervalLessThan5Minutes", () => {
+    it("returns true for step expressions with interval < 5 min", () => {
+      expect(hasCronIntervalLessThan5Minutes("*/1 * * * *")).toBe(true);
+      expect(hasCronIntervalLessThan5Minutes("*/4 * * * *")).toBe(true);
+    });
+
+    it("returns false for step expressions with interval >= 5 min", () => {
+      expect(hasCronIntervalLessThan5Minutes("*/5 * * * *")).toBe(false);
+      expect(hasCronIntervalLessThan5Minutes("*/15 * * * *")).toBe(false);
+    });
+
+    it("returns true for comma-separated values with gap < 5 min", () => {
+      expect(hasCronIntervalLessThan5Minutes("0,2,4 * * * *")).toBe(true);
+      expect(hasCronIntervalLessThan5Minutes("0,10,12 * * * *")).toBe(true);
+    });
+
+    it("returns false for comma-separated values with gap >= 5 min", () => {
+      expect(hasCronIntervalLessThan5Minutes("0,10,20 * * * *")).toBe(false);
+      expect(hasCronIntervalLessThan5Minutes("0,30 * * * *")).toBe(false);
+    });
+
+    it("returns true for comma-separated values with wrap-around gap < 5 min", () => {
+      expect(hasCronIntervalLessThan5Minutes("0,58 * * * *")).toBe(true);
+      expect(hasCronIntervalLessThan5Minutes("2,59 * * * *")).toBe(true);
+    });
+
+    it("returns true for * (every minute)", () => {
+      expect(hasCronIntervalLessThan5Minutes("* * * * *")).toBe(true);
+    });
+
+    it("returns true for range expressions (runs every minute in range)", () => {
+      expect(hasCronIntervalLessThan5Minutes("0-4 * * * *")).toBe(true);
+    });
+
+    it("returns false for single value (hourly)", () => {
+      expect(hasCronIntervalLessThan5Minutes("0 * * * *")).toBe(false);
+    });
+
+    it("returns false for invalid cron", () => {
+      expect(hasCronIntervalLessThan5Minutes("invalid")).toBe(false);
+    });
+  });
 });

workflow-parser/src/model/converter/cron.ts

@@ -8,6 +8,78 @@ type Range = {
   names?: Record<string, number>;
 };
 
+/**
+ * Checks if a cron expression specifies an interval shorter than 5 minutes.
+ * GitHub Actions schedules run at most every 5 minutes, so intervals < 5 min won't work as expected.
+ */
+export function hasCronIntervalLessThan5Minutes(cron: string): boolean {
+  if (!isValidCron(cron)) {
+    return false;
+  }
+
+  const parts = cron.split(/ +/);
+  const minutePart = parts[0];
+
+  // Parse the minute field to determine the effective interval
+  return getMinuteInterval(minutePart) < 5;
+}
+
+/**
+ * Gets the minimum interval in minutes between cron executions based on the minute field.
+ * Returns 60 if there's only one execution per hour, otherwise returns the minimum gap.
+ */
+function getMinuteInterval(minutePart: string): number {
+  // Handle step expressions like */1, */3, 0-59/2
+  if (minutePart.includes("/")) {
+    const [, step] = minutePart.split("/");
+    const stepNum = parseInt(step, 10);
+    if (!isNaN(stepNum) && stepNum > 0) {
+      return stepNum;
+    }
+  }
+
+  // Handle comma-separated values like 0,2,4 or 0,1,5,10
+  if (minutePart.includes(",")) {
+    const values = minutePart
+      .split(",")
+      .map(v => parseInt(v, 10))
+      .filter(n => !isNaN(n))
+      .sort((a, b) => a - b);
+    if (values.length >= 2) {
+      let minGap = 60;
+      for (let i = 1; i < values.length; i++) {
+        const gap = values[i] - values[i - 1];
+        if (gap < minGap) {
+          minGap = gap;
+        }
+      }
+      // Check wrap-around gap from last minute to first minute of next hour
+      const wrapGap = values[0] + 60 - values[values.length - 1];
+      if (wrapGap < minGap) {
+        minGap = wrapGap;
+      }
+      return minGap;
+    }
+  }
+
+  // Handle range expressions like 0-4 (runs every minute from 0-4)
+  if (minutePart.includes("-") && !minutePart.includes("/")) {
+    const [start, end] = minutePart.split("-").map(v => parseInt(v, 10));
+    if (!isNaN(start) && !isNaN(end) && end > start) {
+      // A range without step means every minute in that range
+      return 1;
+    }
+  }
+
+  // * means every minute
+  if (minutePart === "*") {
+    return 1;
+  }
+
+  // Single value or unrecognized pattern - assume hourly (60 min interval)
+  return 60;
+}
+
 export function isValidCron(cron: string): boolean {
   // https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#schedule
 
@@ -46,11 +118,7 @@ export function getCronDescription(cronspec: string): string | undefined {
   }
 
   // Make first character lowercase
-  let result = "Runs " + desc.charAt(0).toLowerCase() + desc.slice(1);
+  return "Runs " + desc.charAt(0).toLowerCase() + desc.slice(1);
-  result +=
-    "\n\nActions schedules run at most every 5 minutes." +
-    " [Learn more](https://docs.github.com/actions/using-workflows/workflow-syntax-for-github-actions#onschedule)";
-  return result;
 }
 
 function validateCronPart(value: string, range: Range, allowSeparators = true): boolean {

workflow-parser/src/model/converter/events.ts

@@ -158,7 +158,7 @@ function convertSchedule(context: TemplateContext, token: SequenceToken): Schedu
         const cron = schedule.value.assertString(`schedule cron`);
         // Validate the cron string
         if (!isValidCron(cron.value)) {
-          context.error(cron, "Invalid cron string");
+          context.error(cron, "Invalid cron expression. Expected format: '* * * * *' (minute hour day month weekday)");
         }
         result.push({cron: cron.value});
       } else {

workflow-parser/src/schema-sync.test.ts

@@ -0,0 +1,183 @@
+import * as fs from "fs";
+
+/**
+ * This test ensures that activity types in workflow-v1.0.json stay in sync with
+ * the webhooks.json file from the languageservice package.
+ *
+ * When this test fails, it means new activity types were added to webhooks.json
+ * that need to be handled. See docs/json-data-files.md for detailed instructions.
+ *
+ * Quick reference for fixing failures:
+ * 1. Check https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows
+ *    Find the event and look at its "Activity types" table to see if the type is a valid workflow trigger.
+ * 2. If the activity type IS a valid workflow trigger:
+ *    → Add it to the corresponding *-activity-type definition in workflow-v1.0.json
+ * 3. If the activity type is webhook-only (not in workflow docs):
+ *    → Add it to the WEBHOOK_ONLY list below
+ * 4. If there's a naming difference between webhook and schema:
+ *    → Add it to the NAME_MAPPINGS list below
+ * 5. If the schema has a type not in webhooks.json:
+ *    → Add it to the SCHEMA_ONLY list below
+ */
+
+describe("schema-sync", () => {
+  // Activity types that exist in webhooks.json but are intentionally NOT
+  // supported as workflow triggers. These will be ignored when checking
+  // webhooks → schema direction.
+  const WEBHOOK_ONLY: Record<string, string[]> = {
+    // check_suite: requested and rerequested are webhook-only, not valid workflow triggers
+    // See: https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows#check_suite
+    check_suite: ["requested", "rerequested"],
+
+    // registry_package: "default" is a webhook concept, not a workflow trigger type
+    registry_package: ["default"]
+  };
+
+  // Activity types that exist in workflow schema but are intentionally NOT
+  // in webhooks.json (schema-only types). These will be ignored when checking
+  // schema → webhooks direction.
+  const SCHEMA_ONLY: Record<string, string[]> = {
+    // registry_package: "updated" is a valid workflow trigger per GitHub docs
+    // but doesn't exist in webhooks.json (webhooks only has "published" and "default")
+    // See: https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows#registry_package
+    registry_package: ["updated"]
+  };
+
+  // Known naming differences between webhooks.json and workflow-v1.0.json.
+  // Key: event name, Value: { webhook: "webhookName", schema: "schemaName" }
+  // These are treated as equivalent when comparing in both directions.
+  const NAME_MAPPINGS: Record<string, Array<{webhook: string; schema: string}>> = {
+    // project_column: webhooks.json uses "edited" but workflow triggers use "updated"
+    // This is a known naming difference - they represent the same action
+    project_column: [{webhook: "edited", schema: "updated"}]
+  };
+
+  it("activity types in workflow-v1.0.json match webhooks.json", () => {
+    // Load webhooks.json (relative path from the test runner CWD which is the package root)
+    const webhooksPath = "../languageservice/src/context-providers/events/webhooks.json";
+    const webhooks = JSON.parse(fs.readFileSync(webhooksPath, "utf-8")) as Record<string, Record<string, unknown>>;
+
+    // Load workflow-v1.0.json
+    const schemaPath = "./src/workflow-v1.0.json";
+    const schema = JSON.parse(fs.readFileSync(schemaPath, "utf-8")) as {
+      definitions: Record<string, {"allowed-values"?: string[]; description?: string}>;
+    };
+
+    const mismatches: string[] = [];
+
+    // Build mapping helpers for each event
+    const getWebhookToSchemaMapping = (eventName: string): Map<string, string> => {
+      const map = new Map<string, string>();
+      for (const mapping of NAME_MAPPINGS[eventName] || []) {
+        map.set(mapping.webhook, mapping.schema);
+      }
+      return map;
+    };
+
+    const getSchemaToWebhookMapping = (eventName: string): Map<string, string> => {
+      const map = new Map<string, string>();
+      for (const mapping of NAME_MAPPINGS[eventName] || []) {
+        map.set(mapping.schema, mapping.webhook);
+      }
+      return map;
+    };
+
+    // Check both directions for each event
+    for (const [eventName, eventData] of Object.entries(webhooks)) {
+      const webhookTypes = Object.keys(eventData);
+      if (webhookTypes.length === 0) continue;
+
+      const schemaTypeName = `${eventName.replace(/_/g, "-")}-activity-type`;
+      const schemaDef = schema.definitions[schemaTypeName];
+
+      // If there's no activity type definition in the schema, this event
+      // doesn't support activity types in workflows (e.g., push, pull)
+      if (!schemaDef || !schemaDef["allowed-values"]) continue;
+
+      const schemaTypes = new Set(schemaDef["allowed-values"]);
+      const webhookOnly = new Set(WEBHOOK_ONLY[eventName] || []);
+      const schemaOnly = new Set(SCHEMA_ONLY[eventName] || []);
+      const webhookToSchema = getWebhookToSchemaMapping(eventName);
+      const schemaToWebhook = getSchemaToWebhookMapping(eventName);
+
+      // Direction 1: webhooks → schema
+      // Check that each webhook type exists in schema (or has a mapping, or is webhook-only)
+      for (const webhookType of webhookTypes) {
+        if (webhookOnly.has(webhookType)) continue;
+
+        const mappedSchemaType = webhookToSchema.get(webhookType);
+        if (mappedSchemaType) {
+          // Has a mapping - check the mapped name exists in schema
+          if (!schemaTypes.has(mappedSchemaType)) {
+            mismatches.push(
+              `Event "${eventName}": webhook type "${webhookType}" maps to "${mappedSchemaType}" but "${mappedSchemaType}" not found in schema`
+            );
+          }
+        } else {
+          // No mapping - check the type exists directly
+          if (!schemaTypes.has(webhookType)) {
+            mismatches.push(
+              `Event "${eventName}": missing activity type "${webhookType}" in workflow-v1.0.json (exists in webhooks.json)`
+            );
+          }
+        }
+      }
+
+      // Direction 2: schema → webhooks
+      // Check that each schema type exists in webhooks (or has a mapping, or is schema-only)
+      const webhookTypesSet = new Set(webhookTypes);
+      for (const schemaType of schemaTypes) {
+        if (schemaOnly.has(schemaType)) continue;
+
+        const mappedWebhookType = schemaToWebhook.get(schemaType);
+        if (mappedWebhookType) {
+          // Has a mapping - check the mapped name exists in webhooks
+          if (!webhookTypesSet.has(mappedWebhookType)) {
+            mismatches.push(
+              `Event "${eventName}": schema type "${schemaType}" maps to "${mappedWebhookType}" but "${mappedWebhookType}" not found in webhooks.json`
+            );
+          }
+        } else {
+          // No mapping - check the type exists directly
+          if (!webhookTypesSet.has(schemaType)) {
+            mismatches.push(
+              `Event "${eventName}": extra activity type "${schemaType}" in workflow-v1.0.json (not in webhooks.json)`
+            );
+          }
+        }
+      }
+
+      // Check that the description mentions all allowed values
+      const activityDefName = `${eventName.replace(/_/g, "-")}-activity`;
+      const activityDef = schema.definitions[activityDefName];
+      if (activityDef?.description) {
+        for (const schemaType of schemaTypes) {
+          if (!activityDef.description.includes(`\`${schemaType}\``)) {
+            mismatches.push(
+              `Event "${eventName}": description in "${activityDefName}" is missing activity type \`${schemaType}\``
+            );
+          }
+        }
+      }
+    }
+
+    if (mismatches.length > 0) {
+      const errorMessage = [
+        "Activity type mismatches found between webhooks.json and workflow-v1.0.json:",
+        "",
+        ...mismatches,
+        "",
+        "To fix these mismatches:",
+        "1. Check GitHub docs: https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows",
+        "2. Verify the activity type is valid for workflow triggers",
+        "3. Update the *-activity-type definition in workflow-parser/src/workflow-v1.0.json",
+        "4. Update the description to list all supported activity types",
+        "5. If there's a naming difference, add it to NAME_MAPPINGS in schema-sync.test.ts",
+        "6. If the type is webhook-only, add it to WEBHOOK_ONLY",
+        "7. If the type is schema-only, add it to SCHEMA_ONLY"
+      ].join("\n");
+
+      throw new Error(errorMessage);
+    }
+  });
+});

workflow-parser/src/workflow-v1.0.json

@@ -856,7 +856,7 @@
       }
     },
     "pull-request-activity": {
-      "description": "The types of pull request activity that trigger the workflow. Supported activity types: `assigned`, `unassigned`, `labeled`, `unlabeled`, `opened`, `edited`, `closed`, `reopened`, `synchronize`, `converted_to_draft`, `ready_for_review`, `locked`, `unlocked`, `review_requested`, `review_request_removed`, `auto_merge_enabled`, `auto_merge_disabled`.",
+      "description": "The types of pull request activity that trigger the workflow. Supported activity types: `assigned`, `unassigned`, `labeled`, `unlabeled`, `opened`, `edited`, `closed`, `reopened`, `synchronize`, `converted_to_draft`, `locked`, `unlocked`, `enqueued`, `dequeued`, `milestoned`, `demilestoned`, `ready_for_review`, `review_requested`, `review_request_removed`, `auto_merge_enabled`, `auto_merge_disabled`.",
       "one-of": [
         "pull-request-activity-type",
         "pull-request-activity-types"
@@ -879,9 +879,13 @@
         "reopened",
         "synchronize",
         "converted_to_draft",
-        "ready_for_review",
         "locked",
         "unlocked",
+        "enqueued",
+        "dequeued",
+        "milestoned",
+        "demilestoned",
+        "ready_for_review",
         "review_requested",
         "review_request_removed",
         "auto_merge_enabled",
@@ -1004,7 +1008,7 @@
       }
     },
     "pull-request-target-activity": {
-      "description": "The types of pull request activity that trigger the workflow. Supported activity types: `assigned`, `unassigned`, `labeled`, `unlabeled`, `opened`, `edited`, `closed`, `reopened`, `synchronize`, `converted_to_draft`, `ready_for_review`, `locked`, `unlocked`, `review_requested`, `review_request_removed`, `auto_merge_enabled`, `auto_merge_disabled`.",
+      "description": "The types of pull request activity that trigger the workflow. Supported activity types: `assigned`, `unassigned`, `labeled`, `unlabeled`, `opened`, `edited`, `closed`, `reopened`, `synchronize`, `converted_to_draft`, `locked`, `unlocked`, `enqueued`, `dequeued`, `milestoned`, `demilestoned`, `ready_for_review`, `review_requested`, `review_request_removed`, `auto_merge_enabled`, `auto_merge_disabled`.",
       "one-of": [
         "pull-request-target-activity-type",
         "pull-request-target-activity-types"
@@ -1027,9 +1031,13 @@
         "reopened",
         "synchronize",
         "converted_to_draft",
-        "ready_for_review",
         "locked",
         "unlocked",
+        "enqueued",
+        "dequeued",
+        "milestoned",
+        "demilestoned",
+        "ready_for_review",
         "review_requested",
         "review_request_removed",
         "auto_merge_enabled",
@@ -1539,7 +1547,7 @@
           },
           "default": "workflow-dispatch-input-default",
           "options": {
-            "type": "sequence-of-non-empty-string",
+            "type": "sequence-of-string",
             "description": "The options of the dropdown list, if the type is a choice."
           }
         }
@@ -2419,6 +2427,11 @@
         "item-type": "non-empty-string"
       }
     },
+    "sequence-of-string": {
+      "sequence": {
+        "item-type": "string"
+      }
+    },
     "boolean-needs-context": {
       "context": [
         "github",

workflow-parser/src/workflows/workflow-schema.ts

@@ -1,6 +1,6 @@
 import {JSONObjectReader} from "../templates/json-object-reader";
 import {TemplateSchema} from "../templates/schema";
-import WorkflowSchema from "../workflow-v1.0.json";
+import WorkflowSchema from "../workflow-v1.0.min.json";
 
 let schema: TemplateSchema;
 

workflow-parser/src/workflows/yaml-object-reader.ts

@@ -1,4 +1,16 @@
-import {isCollection, isDocument, isMap, isPair, isScalar, isSeq, LineCounter, parseDocument, Scalar} from "yaml";
+import {
+  isAlias,
+  isCollection,
+  isDocument,
+  isMap,
+  isPair,
+  isScalar,
+  isSeq,
+  LineCounter,
+  parseDocument,
+  Scalar
+} from "yaml";
+import type {Document} from "yaml";
 import type {LinePos} from "yaml/dist/errors";
 import type {NodeBase} from "yaml/dist/nodes/Node";
 import {ObjectReader} from "../templates/object-reader";
@@ -22,30 +34,31 @@ export type YamlError = {
 export class YamlObjectReader implements ObjectReader {
   private readonly _generator: Generator<ParseEvent>;
   private _current!: IteratorResult<ParseEvent>;
+  private readonly doc: Document;
   private fileId?: number;
   private lineCounter = new LineCounter();
 
   public errors: YamlError[] = [];
 
   constructor(fileId: number | undefined, content: string) {
-    const doc = parseDocument(content, {
+    this.doc = parseDocument(content, {
       lineCounter: this.lineCounter,
       keepSourceTokens: true,
       uniqueKeys: false // Uniqueness is validated by the template reader
     });
-    for (const err of doc.errors) {
+    for (const err of this.doc.errors) {
       this.errors.push({message: err.message, range: rangeFromLinePos(err.linePos)});
     }
-    this._generator = this.getNodes(doc);
+    this._generator = this.getNodes(this.doc, new Set());
     this.fileId = fileId;
   }
 
-  private *getNodes(node: unknown): Generator<ParseEvent, void> {
+  private *getNodes(node: unknown, aliasResolutionStack: Set<unknown>): Generator<ParseEvent, void> {
     let range = this.getRange(node as NodeBase | undefined);
 
     if (isDocument(node)) {
       yield new ParseEvent(EventType.DocumentStart);
-      for (const item of this.getNodes(node.contents)) {
+      for (const item of this.getNodes(node.contents, new Set())) {
         yield item;
       }
       yield new ParseEvent(EventType.DocumentEnd);
@@ -59,7 +72,7 @@ export class YamlObjectReader implements ObjectReader {
       }
 
       for (const item of node.items) {
-        for (const child of this.getNodes(item)) {
+        for (const child of this.getNodes(item, aliasResolutionStack)) {
           yield child;
         }
       }
@@ -74,12 +87,32 @@ export class YamlObjectReader implements ObjectReader {
       yield new ParseEvent(EventType.Literal, YamlObjectReader.getLiteralToken(this.fileId, range, node));
     }
 
+    // Handle YAML aliases - resolve to the anchored value
+    if (isAlias(node)) {
+      const resolved = node.resolve(this.doc);
+      if (resolved) {
+        // Prevent infinite recursion from circular aliases
+        if (aliasResolutionStack.has(resolved)) {
+          // Silently ignore circular reference - the missing content will cause
+          // downstream validation errors which is acceptable for this edge case
+          return;
+        }
+        // Track this node in the alias resolution stack
+        const newStack = new Set(aliasResolutionStack);
+        newStack.add(resolved);
+        // Yield the resolved node's contents
+        yield* this.getNodes(resolved, newStack);
+      }
+      // If unresolved, the yaml library already reports an error
+      return;
+    }
+
     if (isPair(node)) {
       const scalarKey = node.key as Scalar;
       range = this.getRange(scalarKey);
       const key = scalarKey.value as string;
       yield new ParseEvent(EventType.Literal, new StringToken(this.fileId, range, key, undefined));
-      for (const child of this.getNodes(node.value)) {
+      for (const child of this.getNodes(node.value, aliasResolutionStack)) {
         yield child;
       }
     }

workflow-parser/testdata/reader/events-mapping-all.yml

@@ -120,6 +120,8 @@ on:
       - unassigned
       - labeled
       - unlabeled
+      - milestoned
+      - demilestoned
       - opened
       - edited
       - closed
@@ -129,6 +131,8 @@ on:
       - ready_for_review
       - locked
       - unlocked
+      - enqueued
+      - dequeued
       - review_requested
       - review_request_removed
       - auto_merge_enabled
@@ -160,6 +164,8 @@ on:
       - unassigned
       - labeled
       - unlabeled
+      - milestoned
+      - demilestoned
       - opened
       - edited
       - closed
@@ -169,6 +175,8 @@ on:
       - ready_for_review
       - locked
       - unlocked
+      - enqueued
+      - dequeued
       - review_requested
       - review_request_removed
       - auto_merge_enabled
@@ -386,6 +394,8 @@ jobs:
         "unassigned",
         "labeled",
         "unlabeled",
+        "milestoned",
+        "demilestoned",
         "opened",
         "edited",
         "closed",
@@ -395,6 +405,8 @@ jobs:
         "ready_for_review",
         "locked",
         "unlocked",
+        "enqueued",
+        "dequeued",
         "review_requested",
         "review_request_removed",
         "auto_merge_enabled",
@@ -441,6 +453,8 @@ jobs:
         "unassigned",
         "labeled",
         "unlabeled",
+        "milestoned",
+        "demilestoned",
         "opened",
         "edited",
         "closed",
@@ -450,6 +464,8 @@ jobs:
         "ready_for_review",
         "locked",
         "unlocked",
+        "enqueued",
+        "dequeued",
         "review_requested",
         "review_request_removed",
         "auto_merge_enabled",