Release extension version 0.4.0

feat: add job.workflow_* context properties

.github/CODEOWNERS

@@ -1 +1,4 @@
 * @actions/actions-vscode-reviewers
+
+# Owners maintaining https://github.com/actions/runner-images
+/languageservice/src/value-providers/default.ts @actions/runner-images-writers @actions/actions-vscode-reviewers

.github/workflows/buildtest.yml

@@ -14,7 +14,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [18.x, 20.x, 22.x]
+        node-version: [20.x, 22.x, 24.x]
 
     steps:
     - uses: actions/checkout@v4
@@ -37,10 +37,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Use Node.js 22.x
+    - name: Use Node.js 24.x
       uses: actions/setup-node@v4
       with:
-        node-version: 22.x
+        node-version: 24.x
         cache: 'npm'
         registry-url: 'https://npm.pkg.github.com'
     - run: npm ci

.github/workflows/publish.yml

@@ -29,7 +29,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: "16"
+          node-version: 24.x
 
       - name: Bump version and push
         run: |

.github/workflows/release.yml

@@ -59,7 +59,7 @@ jobs:
 
     permissions:
       contents: write
-      packages: write
+      id-token: write
 
     env:
       PKG_VERSION: "" # will be set in the workflow
@@ -69,9 +69,8 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: 22.x
+          node-version: 24.x
           cache: "npm"
-          scope: '@actions'
 
       - name: Parse version from lerna.json
         run: |
@@ -97,13 +96,6 @@ jobs:
             core.summary.addLink(`Release v${{ env.PKG_VERSION }}`, release.data.html_url);
             await core.summary.write();
 
-      - name: setup authentication
-        run: echo "//registry.npmjs.org/:_authToken=${NPM_TOKEN}" >> .npmrc
-        env:
-          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
-
       - name: Publish packages
         run: |
-          lerna publish ${{ env.PKG_VERSION }} --yes --no-git-reset --no-git-tag-version
-        env:
-          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+          npx lerna publish ${{ env.PKG_VERSION }} --yes --no-git-reset --no-git-tag-version

.prettierignore

@@ -3,4 +3,5 @@ dist
 *.md
 *.js
 *.json
-*.d.ts
+*.d.ts
+/.nx/workspace-data

AGENTS.md

@@ -0,0 +1,33 @@
+# Agents
+
+## Build
+
+```
+npx lerna run build
+```
+
+## Test
+
+```
+npm -w @actions/expressions test
+npm -w @actions/workflow-parser test
+npm -w @actions/languageservice test
+```
+
+## Format
+
+Always run formatting before committing:
+
+```
+npx prettier --write <changed files>
+```
+
+Verify with:
+
+```
+npm run format-check -ws
+```
+
+## Feature flags
+
+Feature flags are defined in `expressions/src/features.ts` (`ExperimentalFeatures` interface + `allFeatureKeys` array). They are plumbed through `ConvertOptions`, `CompletionConfig`, `ValidationConfig`, and `initializationOptions`. When a feature graduates to stable, remove its flag and make the behavior unconditional.

expressions/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@actions/expressions",
-  "version": "0.3.38",
+  "version": "0.4.0",
   "license": "MIT",
   "type": "module",
   "source": "./src/index.ts",
@@ -44,7 +44,7 @@
     "watch": "tsc --build tsconfig.build.json --watch"
   },
   "engines": {
-    "node": ">= 18"
+    "node": ">= 20"
   },
   "files": [
     "dist/**/*"

expressions/src/features.test.ts

@@ -54,8 +54,8 @@ describe("FeatureFlags", () => {
       expect(flags.getEnabledFeatures()).toEqual([
         "missingInputsQuickfix",
         "blockScalarChompingWarning",
-        "actionScaffoldingSnippets",
-        "allowCaseFunction"
+        "allowCaseFunction",
+        "allowCopilotRequestsPermission"
       ]);
     });
   });

expressions/src/features.ts

@@ -29,18 +29,17 @@ export interface ExperimentalFeatures {
    */
   blockScalarChompingWarning?: boolean;
 
-  /**
-   * Enable action scaffolding snippets in action.yml files.
-   * Offers Node.js, Composite, and Docker action scaffolds.
-   * @default false
-   */
-  actionScaffoldingSnippets?: boolean;
-
   /**
    * Enable the case() function in expressions.
    * @default false
    */
   allowCaseFunction?: boolean;
+
+  /**
+   * Enable the copilot-requests permission in workflow permissions.
+   * @default false
+   */
+  allowCopilotRequestsPermission?: boolean;
 }
 
 /**
@@ -55,8 +54,8 @@ export type ExperimentalFeatureKey = Exclude<keyof ExperimentalFeatures, "all">;
 const allFeatureKeys: ExperimentalFeatureKey[] = [
   "missingInputsQuickfix",
   "blockScalarChompingWarning",
-  "actionScaffoldingSnippets",
-  "allowCaseFunction"
+  "allowCaseFunction",
+  "allowCopilotRequestsPermission"
 ];
 
 export class FeatureFlags {

languageserver/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@actions/languageserver",
-  "version": "0.3.38",
+  "version": "0.4.0",
   "description": "Language server for GitHub Actions",
   "license": "MIT",
   "type": "module",
@@ -48,8 +48,8 @@
     "actions-languageserver": "./bin/actions-languageserver"
   },
   "dependencies": {
-    "@actions/languageservice": "^0.3.38",
-    "@actions/workflow-parser": "^0.3.38",
+    "@actions/languageservice": "^0.4.0",
+    "@actions/workflow-parser": "^0.4.0",
     "@octokit/rest": "^21.1.1",
     "@octokit/types": "^9.0.0",
     "vscode-languageserver": "^8.0.2",
@@ -57,7 +57,7 @@
     "yaml": "^2.1.3"
   },
   "engines": {
-    "node": ">= 18"
+    "node": ">= 20"
   },
   "files": [
     "dist/**/*",
@@ -73,9 +73,10 @@
     "eslint-plugin-prettier": "^4.2.1",
     "fetch-mock": "^9.11.0",
     "jest": "^29.0.3",
+    "node-fetch": "^2.6.7",
     "prettier": "^2.8.3",
     "rimraf": "^3.0.2",
     "ts-jest": "^29.0.3",
-    "typescript": "^4.8.4"
+    "typescript": "^5.8.3"
   }
 }

languageserver/src/connection.ts

@@ -154,7 +154,8 @@ export function initConnection(connection: Connection) {
           getDocument(documents, textDocument),
           client,
           repos.find(repo => textDocument.uri.startsWith(repo.workspaceUri)),
-          cache
+          cache,
+          featureFlags
         )
     );
   });

languageserver/src/on-completion.ts

@@ -1,4 +1,5 @@
 import {complete} from "@actions/languageservice/complete";
+import type {FeatureFlags} from "@actions/expressions";
 import {Octokit} from "@octokit/rest";
 import {CompletionItem, Connection, Position} from "vscode-languageserver";
 import {TextDocument} from "vscode-languageserver-textdocument";
@@ -15,11 +16,13 @@ export async function onCompletion(
   document: TextDocument,
   client: Octokit | undefined,
   repoContext: RepositoryContext | undefined,
-  cache: TTLCache
+  cache: TTLCache,
+  featureFlags?: FeatureFlags
 ): Promise<CompletionItem[]> {
   return await complete(document, position, {
     valueProviderConfig: repoContext && valueProviders(client, repoContext, cache),
     contextProviderConfig: repoContext && contextProviders(client, repoContext, cache),
+    featureFlags,
     fileProvider: getFileProvider(client, cache, repoContext?.workspaceUri, async path => {
       return await connection.sendRequest(Requests.ReadFile, {path});
     })

languageservice/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@actions/languageservice",
-  "version": "0.3.38",
+  "version": "0.4.0",
   "description": "Language service for GitHub Actions",
   "license": "MIT",
   "type": "module",
@@ -47,15 +47,15 @@
     "watch": "tsc --build tsconfig.build.json --watch"
   },
   "dependencies": {
-    "@actions/expressions": "^0.3.38",
-    "@actions/workflow-parser": "^0.3.38",
+    "@actions/expressions": "^0.4.0",
+    "@actions/workflow-parser": "^0.4.0",
     "vscode-languageserver-textdocument": "^1.0.7",
     "vscode-languageserver-types": "^3.17.2",
     "vscode-uri": "^3.0.8",
     "yaml": "^2.1.1"
   },
   "engines": {
-    "node": ">= 18"
+    "node": ">= 20"
   },
   "files": [
     "dist/**/*"
@@ -74,6 +74,6 @@
     "rimraf": "^3.0.2",
     "ts-jest": "^29.0.3",
     "ts-node": "^10.9.1",
-    "typescript": "^4.8.4"
+    "typescript": "^5.8.3"
   }
 }

languageservice/src/complete-action.test.ts

@@ -1,17 +1,11 @@
-import {FeatureFlags} from "@actions/expressions";
 import {TextDocument} from "vscode-languageserver-textdocument";
-import {complete, CompletionConfig} from "./complete";
+import {complete} from "./complete";
 import {clearCache} from "./utils/workflow-cache";
 
 beforeEach(() => {
   clearCache();
 });
 
-// Config to enable action scaffolding snippets
-const scaffoldingConfig: CompletionConfig = {
-  featureFlags: new FeatureFlags({actionScaffoldingSnippets: true})
-};
-
 describe("complete action files", () => {
   function createActionDocument(
     content: string,
@@ -140,6 +134,49 @@ runs:
       expect(labels).toContain("arch");
       expect(labels).toContain("temp");
     });
+
+    it("completes if expression value for composite run step", async () => {
+      const [doc, position] = createActionDocument(`name: My Action
+description: Test action
+runs:
+  using: composite
+  steps:
+    - if: |
+      run: echo "hello"
+      shell: bash`);
+      const completions = await complete(doc, position);
+      const labels = completions.map(c => c.label);
+
+      // Should show expression-related completions (status functions and contexts)
+      expect(labels).toContain("always");
+      expect(labels).toContain("success");
+      expect(labels).toContain("failure");
+      expect(labels).toContain("cancelled");
+      expect(labels).toContain("runner");
+      expect(labels).toContain("github");
+      expect(labels).toContain("inputs");
+      expect(labels).toContain("steps");
+    });
+
+    it("completes if expression value for composite uses step", async () => {
+      const [doc, position] = createActionDocument(`name: My Action
+description: Test action
+runs:
+  using: composite
+  steps:
+    - if: |
+      uses: actions/checkout@v4`);
+      const completions = await complete(doc, position);
+      const labels = completions.map(c => c.label);
+
+      // Should show expression-related completions
+      expect(labels).toContain("always");
+      expect(labels).toContain("success");
+      expect(labels).toContain("failure");
+      expect(labels).toContain("cancelled");
+      expect(labels).toContain("runner");
+      expect(labels).toContain("github");
+    });
   });
 
   describe("top-level completions", () => {
@@ -213,6 +250,85 @@ runs:
       expect(labels).not.toContain("entrypoint");
     });
 
+    it("filters runs keys for node24 actions", async () => {
+      const [doc, position] = createActionDocument(`name: Test
+description: Test
+runs:
+  using: node24
+  |`);
+      const completions = await complete(doc, position);
+      const labels = completions.map(c => c.label);
+
+      // Should show Node.js action keys
+      expect(labels).toContain("main");
+      expect(labels).toContain("pre");
+      expect(labels).toContain("post");
+      expect(labels).toContain("pre-if");
+      expect(labels).toContain("post-if");
+
+      // Should NOT show composite or docker keys
+      expect(labels).not.toContain("steps");
+      expect(labels).not.toContain("image");
+      expect(labels).not.toContain("entrypoint");
+    });
+
+    it("completes pre-if expression value for node actions", async () => {
+      const [doc, position] = createActionDocument(`name: Test
+description: Test
+runs:
+  using: node24
+  main: index.js
+  pre: setup.js
+  pre-if: |`);
+      const completions = await complete(doc, position);
+      const labels = completions.map(c => c.label);
+
+      // Should show expression-related completions (context functions and namespaces)
+      expect(labels).toContain("always");
+      expect(labels).toContain("success");
+      expect(labels).toContain("failure");
+      expect(labels).toContain("cancelled");
+      expect(labels).toContain("runner");
+      expect(labels).toContain("github");
+      expect(labels).toContain("inputs");
+      expect(labels).toContain("hashFiles");
+    });
+
+    it("completes post-if expression value for node actions", async () => {
+      const [doc, position] = createActionDocument(`name: Test
+description: Test
+runs:
+  using: node24
+  main: index.js
+  post: cleanup.js
+  post-if: |`);
+      const completions = await complete(doc, position);
+      const labels = completions.map(c => c.label);
+
+      // Should show expression-related completions
+      expect(labels).toContain("always");
+      expect(labels).toContain("runner");
+      expect(labels).toContain("hashFiles");
+    });
+
+    it("completes pre-if expression value for docker actions", async () => {
+      const [doc, position] = createActionDocument(`name: Test
+description: Test
+runs:
+  using: docker
+  image: docker://alpine
+  pre-entrypoint: setup.sh
+  pre-if: |`);
+      const completions = await complete(doc, position);
+      const labels = completions.map(c => c.label);
+
+      // Should show expression-related completions
+      expect(labels).toContain("always");
+      expect(labels).toContain("runner");
+      expect(labels).toContain("github");
+      expect(labels).toContain("hashFiles");
+    });
+
     it("filters runs keys for composite actions", async () => {
       const [doc, position] = createActionDocument(`name: Test
 description: Test
@@ -403,7 +519,7 @@ runs:
   describe("action scaffolding snippets", () => {
     it("offers full scaffolding snippets in empty file", async () => {
       const [doc, position] = createActionDocument(`|`);
-      const completions = await complete(doc, position, scaffoldingConfig);
+      const completions = await complete(doc, position);
       const labels = completions.map(c => c.label);
 
       expect(labels).toContain("Node.js Action");
@@ -419,7 +535,7 @@ runs:
     it("offers full scaffolding snippets when no name or description exists", async () => {
       const [doc, position] = createActionDocument(`author: me
 |`);
-      const completions = await complete(doc, position, scaffoldingConfig);
+      const completions = await complete(doc, position);
 
       const nodeSnippet = completions.find(c => c.label === "Node.js Action");
       expect(nodeSnippet).toBeDefined();
@@ -430,7 +546,7 @@ runs:
     it("offers runs-only snippets when name exists", async () => {
       const [doc, position] = createActionDocument(`name: My Action
 |`);
-      const completions = await complete(doc, position, scaffoldingConfig);
+      const completions = await complete(doc, position);
 
       const nodeSnippet = completions.find(c => c.label === "Node.js Action");
       expect(nodeSnippet).toBeDefined();
@@ -442,7 +558,7 @@ runs:
     it("offers runs-only snippets when description exists", async () => {
       const [doc, position] = createActionDocument(`description: Does something
 |`);
-      const completions = await complete(doc, position, scaffoldingConfig);
+      const completions = await complete(doc, position);
 
       const compositeSnippet = completions.find(c => c.label === "Composite Action");
       expect(compositeSnippet).toBeDefined();
@@ -457,7 +573,7 @@ description: Test
 runs:
   using: composite
   |`);
-      const completions = await complete(doc, position, scaffoldingConfig);
+      const completions = await complete(doc, position);
       const labels = completions.map(c => c.label);
 
       expect(labels).not.toContain("Node.js Action");
@@ -470,7 +586,7 @@ runs:
 description: Test
 runs:
   |`);
-      const completions = await complete(doc, position, scaffoldingConfig);
+      const completions = await complete(doc, position);
       const labels = completions.map(c => c.label);
 
       expect(labels).toContain("Node.js Action");
@@ -484,7 +600,7 @@ description: Test
 runs:
   steps: []
 |`);
-      const completions = await complete(doc, position, scaffoldingConfig);
+      const completions = await complete(doc, position);
       const labels = completions.map(c => c.label);
 
       expect(labels).not.toContain("Node.js Action");
@@ -499,7 +615,7 @@ runs:
   using: composite
   steps:
     - |`);
-      const completions = await complete(doc, position, scaffoldingConfig);
+      const completions = await complete(doc, position);
       const labels = completions.map(c => c.label);
 
       expect(labels).not.toContain("Node.js Action");
@@ -509,7 +625,7 @@ runs:
 
     it("Node.js snippet contains expected content", async () => {
       const [doc, position] = createActionDocument(`|`);
-      const completions = await complete(doc, position, scaffoldingConfig);
+      const completions = await complete(doc, position);
 
       const nodeSnippet = completions.find(c => c.label === "Node.js Action");
       const text = (nodeSnippet?.textEdit as {newText: string})?.newText;
@@ -522,7 +638,7 @@ runs:
 
     it("Composite snippet contains expected content", async () => {
       const [doc, position] = createActionDocument(`|`);
-      const completions = await complete(doc, position, scaffoldingConfig);
+      const completions = await complete(doc, position);
 
       const compositeSnippet = completions.find(c => c.label === "Composite Action");
       const text = (compositeSnippet?.textEdit as {newText: string})?.newText;
@@ -534,7 +650,7 @@ runs:
 
     it("Docker snippet contains expected content", async () => {
       const [doc, position] = createActionDocument(`|`);
-      const completions = await complete(doc, position, scaffoldingConfig);
+      const completions = await complete(doc, position);
 
       const dockerSnippet = completions.find(c => c.label === "Docker Action");
       const text = (dockerSnippet?.textEdit as {newText: string})?.newText;
@@ -544,14 +660,30 @@ runs:
       expect(text).toContain("entrypoint:");
     });
 
-    it("does not offer snippets when feature flag is disabled", async () => {
+    it("replaces typed text when selecting scaffolding snippet", async () => {
+      // User typed "compo" and then triggered completion
+      const [doc, position] = createActionDocument(`compo|`);
+      const completions = await complete(doc, position);
+
+      const compositeSnippet = completions.find(c => c.label === "Composite Action");
+      expect(compositeSnippet).toBeDefined();
+
+      // The textEdit should replace "compo", not insert after it
+      const textEdit = compositeSnippet?.textEdit as {range: {start: {character: number}; end: {character: number}}};
+      expect(textEdit.range.start.character).toBe(0); // Start of "compo"
+      expect(textEdit.range.end.character).toBe(5); // End of "compo"
+    });
+
+    it("handles empty file with no typed text", async () => {
       const [doc, position] = createActionDocument(`|`);
       const completions = await complete(doc, position);
-      const labels = completions.map(c => c.label);
 
-      expect(labels).not.toContain("Node.js Action");
-      expect(labels).not.toContain("Composite Action");
-      expect(labels).not.toContain("Docker Action");
+      const compositeSnippet = completions.find(c => c.label === "Composite Action");
+      const textEdit = compositeSnippet?.textEdit as {range: {start: {character: number}; end: {character: number}}};
+
+      // Zero-length range is fine when there's nothing to replace
+      expect(textEdit.range.start.character).toBe(0);
+      expect(textEdit.range.end.character).toBe(0);
     });
   });
 });

languageservice/src/complete-action.ts

@@ -1,7 +1,7 @@
 import {TemplateToken} from "@actions/workflow-parser/templates/tokens/index";
 import {MappingToken} from "@actions/workflow-parser/templates/tokens/mapping-token";
 import {Position} from "vscode-languageserver-textdocument";
-import {CompletionItem, CompletionItemKind, InsertTextFormat, TextEdit} from "vscode-languageserver-types";
+import {CompletionItem, CompletionItemKind, InsertTextFormat, Range, TextEdit} from "vscode-languageserver-types";
 import {Value} from "./value-providers/config.js";
 
 /**
@@ -53,9 +53,6 @@ runs:
   #   const greeting = \\\`Hello \\\${name}\\\`;
   #   console.log(greeting);
   #   fs.appendFileSync(process.env.GITHUB_OUTPUT, \\\`greeting=\\\${greeting}\\\\n\\\`);
-  #
-  # For JavaScript actions with @actions/toolkit, see:
-  # https://docs.github.com/en/actions/sharing-automations/creating-actions/creating-a-javascript-action
 `;
 
 const ACTION_SNIPPET_NODEJS_RUNS = `inputs:
@@ -320,7 +317,8 @@ export function filterActionRunsCompletions(values: Value[], path: TemplateToken
 export function getActionScaffoldingSnippets(
   root: TemplateToken | undefined,
   path: TemplateToken[],
-  position: Position
+  position: Position,
+  replaceRange?: Range
 ): CompletionItem[] {
   // Get the runs mapping from the root, if it exists
   let runsMapping: MappingToken | undefined;
@@ -351,24 +349,27 @@ export function getActionScaffoldingSnippets(
     return [
       createSnippetCompletion(
         "Node.js Action",
-        "Scaffold a Node.js action",
+        "Scaffold a Node.js action\n\n[Documentation](https://docs.github.com/en/actions/sharing-automations/creating-actions/creating-a-javascript-action)",
         ACTION_SNIPPET_NODEJS_USING,
         position,
-        "0_nodejs"
+        "0_nodejs",
+        replaceRange
       ),
       createSnippetCompletion(
         "Composite Action",
-        "Scaffold a composite action",
+        "Scaffold a composite action\n\n[Documentation](https://docs.github.com/en/actions/sharing-automations/creating-actions/creating-a-composite-action)",
         ACTION_SNIPPET_COMPOSITE_USING,
         position,
-        "1_composite"
+        "1_composite",
+        replaceRange
       ),
       createSnippetCompletion(
         "Docker Action",
-        "Scaffold a Docker action",
+        "Scaffold a Docker action\n\n[Documentation](https://docs.github.com/en/actions/sharing-automations/creating-actions/creating-a-docker-container-action)",
         ACTION_SNIPPET_DOCKER_USING,
         position,
-        "2_docker"
+        "2_docker",
+        replaceRange
       )
     ];
   }
@@ -396,24 +397,27 @@ export function getActionScaffoldingSnippets(
     return [
       createSnippetCompletion(
         "Node.js Action",
-        "Scaffold a Node.js action",
+        "Scaffold a Node.js action\n\n[Documentation](https://docs.github.com/en/actions/sharing-automations/creating-actions/creating-a-javascript-action)",
         ACTION_SNIPPET_NODEJS_RUNS,
         position,
-        "1_nodejs"
+        "1_nodejs",
+        replaceRange
       ),
       createSnippetCompletion(
         "Composite Action",
-        "Scaffold a composite action",
+        "Scaffold a composite action\n\n[Documentation](https://docs.github.com/en/actions/sharing-automations/creating-actions/creating-a-composite-action)",
         ACTION_SNIPPET_COMPOSITE_RUNS,
         position,
-        "2_composite"
+        "2_composite",
+        replaceRange
       ),
       createSnippetCompletion(
         "Docker Action",
-        "Scaffold a Docker action",
+        "Scaffold a Docker action\n\n[Documentation](https://docs.github.com/en/actions/sharing-automations/creating-actions/creating-a-docker-container-action)",
         ACTION_SNIPPET_DOCKER_RUNS,
         position,
-        "3_docker"
+        "3_docker",
+        replaceRange
       )
     ];
   }
@@ -422,24 +426,27 @@ export function getActionScaffoldingSnippets(
   return [
     createSnippetCompletion(
       "Node.js Action",
-      "Scaffold a complete Node.js action",
+      "Scaffold a complete Node.js action\n\n[Documentation](https://docs.github.com/en/actions/sharing-automations/creating-actions/creating-a-javascript-action)",
       ACTION_SNIPPET_NODEJS_FULL,
       position,
-      "1_nodejs"
+      "1_nodejs",
+      replaceRange
     ),
     createSnippetCompletion(
       "Composite Action",
-      "Scaffold a complete composite action",
+      "Scaffold a complete composite action\n\n[Documentation](https://docs.github.com/en/actions/sharing-automations/creating-actions/creating-a-composite-action)",
       ACTION_SNIPPET_COMPOSITE_FULL,
       position,
-      "2_composite"
+      "2_composite",
+      replaceRange
     ),
     createSnippetCompletion(
       "Docker Action",
-      "Scaffold a complete Docker action",
+      "Scaffold a complete Docker action\n\n[Documentation](https://docs.github.com/en/actions/sharing-automations/creating-actions/creating-a-docker-container-action)",
       ACTION_SNIPPET_DOCKER_FULL,
       position,
-      "3_docker"
+      "3_docker",
+      replaceRange
     )
   ];
 }
@@ -452,10 +459,15 @@ function createSnippetCompletion(
   description: string,
   snippetText: string,
   position: Position,
-  sortText: string
+  sortText: string,
+  replaceRange?: Range
 ): CompletionItem {
+  // Use replace if we have a range, otherwise insert at position
+  const textEdit = replaceRange ? TextEdit.replace(replaceRange, snippetText) : TextEdit.insert(position, snippetText);
+
   return {
     label,
+    labelDetails: {description: "snippet"},
     kind: CompletionItemKind.Snippet,
     documentation: {
       kind: "markdown",
@@ -463,6 +475,6 @@ function createSnippetCompletion(
     },
     insertTextFormat: InsertTextFormat.Snippet,
     sortText,
-    textEdit: TextEdit.insert(position, snippetText)
+    textEdit
   };
 }

languageservice/src/complete.expressions.test.ts

@@ -1,6 +1,6 @@
 /* eslint-disable @typescript-eslint/no-non-null-assertion */
 import {data, DescriptionDictionary, FeatureFlags} from "@actions/expressions";
-import {CompletionItem, CompletionItemKind} from "vscode-languageserver-types";
+import {CompletionItem, CompletionItemKind, MarkupContent} from "vscode-languageserver-types";
 import {complete, getExpressionInput} from "./complete.js";
 import {ContextProviderConfig} from "./context-providers/config.js";
 import {registerLogger} from "./log.js";
@@ -419,6 +419,36 @@ jobs:
 
         expect(result.map(x => x.label)).toEqual(["event"]);
       });
+
+      it("includes both contexts and extension functions", async () => {
+        const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - run: echo
+      if: |`;
+        const result = await complete(...getPositionFromCursor(input), {contextProviderConfig});
+        const labels = result.map(x => x.label);
+
+        // Context namespaces should be present
+        expect(labels).toContain("github");
+        expect(labels).toContain("runner");
+        expect(labels).toContain("env");
+        expect(labels).toContain("steps");
+
+        // Extension functions should be present (from schema context array)
+        expect(labels).toContain("hashFiles");
+        expect(labels).toContain("always");
+        expect(labels).toContain("success");
+        expect(labels).toContain("failure");
+        expect(labels).toContain("cancelled");
+
+        // Built-in functions should be present
+        expect(labels).toContain("toJson");
+        expect(labels).toContain("fromJson");
+        expect(labels).toContain("contains");
+      });
     });
   });
 
@@ -1134,7 +1164,16 @@ jobs:
 `;
 
       const result = await complete(...getPositionFromCursor(input), {contextProviderConfig});
-      expect(result.map(x => x.label)).toEqual(["check_run_id", "container", "services", "status"]);
+      expect(result.map(x => x.label)).toEqual([
+        "check_run_id",
+        "container",
+        "services",
+        "status",
+        "workflow_file_path",
+        "workflow_ref",
+        "workflow_repository",
+        "workflow_sha"
+      ]);
     });
 
     it("job context is suggested within a job output", async () => {
@@ -1278,6 +1317,7 @@ jobs:
     expect(hashFiles).toBeDefined();
     expect(hashFiles!.kind).toBe(CompletionItemKind.Function);
     expect(hashFiles!.insertText).toBe("hashFiles()");
+    expect((hashFiles!.documentation as MarkupContent)?.value).toContain("Returns a single hash for the set of files");
 
     // Not a function
     const github = result.find(x => x.label === "github");

languageservice/src/complete.test.ts

@@ -20,8 +20,8 @@ describe("completion", () => {
     const result = await complete(...getPositionFromCursor(input));
 
     expect(result).not.toBeUndefined();
-    // 12 runner labels + 2 escape hatches (switch to list, switch to full syntax)
-    expect(result.length).toEqual(14);
+    // 28 runner labels + 2 escape hatches (switch to list, switch to full syntax)
+    expect(result.length).toEqual(30);
     const labels = result.map(x => x.label);
     expect(labels).toContain("macos-latest");
     expect(labels).toContain("(switch to list)");
@@ -60,7 +60,7 @@ jobs:
     const result = await complete(...getPositionFromCursor(input));
 
     expect(result).not.toBeUndefined();
-    expect(result.length).toEqual(11);
+    expect(result.length).toEqual(27);
 
     const labels = result.map(x => x.label);
     expect(labels).toContain("macos-latest");
@@ -925,3 +925,128 @@ jobs:
     });
   });
 });
+
+describe("schedule timezone completion", () => {
+  it("includes timezone for schedule", async () => {
+    const input = `on:
+  schedule:
+    - |`;
+    const result = await complete(...getPositionFromCursor(input));
+
+    expect(result).not.toBeUndefined();
+    const labels = result.map(x => x.label);
+    expect(labels).toContain("cron");
+    expect(labels).toContain("timezone");
+  });
+});
+
+describe("permissions copilot-requests completion", () => {
+  it("includes copilot-requests when allowCopilotRequestsPermission is enabled", async () => {
+    const input = `on: push
+permissions:
+  |`;
+    const result = await complete(...getPositionFromCursor(input), {
+      featureFlags: new FeatureFlags({allowCopilotRequestsPermission: true})
+    });
+
+    expect(result).not.toBeUndefined();
+    const labels = result.map(x => x.label);
+    expect(labels).toContain("actions");
+    expect(labels).toContain("copilot-requests");
+  });
+
+  it("excludes copilot-requests when allowCopilotRequestsPermission is disabled", async () => {
+    const input = `on: push
+permissions:
+  |`;
+    const result = await complete(...getPositionFromCursor(input), {
+      featureFlags: new FeatureFlags({allowCopilotRequestsPermission: false})
+    });
+
+    expect(result).not.toBeUndefined();
+    const labels = result.map(x => x.label);
+    expect(labels).toContain("actions");
+    expect(labels).not.toContain("copilot-requests");
+  });
+
+  it("excludes copilot-requests when no feature flags are provided", async () => {
+    const input = `on: push
+permissions:
+  |`;
+    const result = await complete(...getPositionFromCursor(input));
+
+    expect(result).not.toBeUndefined();
+    const labels = result.map(x => x.label);
+    expect(labels).toContain("actions");
+    expect(labels).not.toContain("copilot-requests");
+  });
+
+  it("includes copilot-requests in job-level permissions when allowCopilotRequestsPermission is enabled", async () => {
+    const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      |`;
+    const result = await complete(...getPositionFromCursor(input), {
+      featureFlags: new FeatureFlags({allowCopilotRequestsPermission: true})
+    });
+
+    expect(result).not.toBeUndefined();
+    const labels = result.map(x => x.label);
+    expect(labels).toContain("actions");
+    expect(labels).toContain("copilot-requests");
+  });
+
+  it("excludes copilot-requests from job-level permissions when allowCopilotRequestsPermission is disabled", async () => {
+    const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      |`;
+    const result = await complete(...getPositionFromCursor(input), {
+      featureFlags: new FeatureFlags({allowCopilotRequestsPermission: false})
+    });
+
+    expect(result).not.toBeUndefined();
+    const labels = result.map(x => x.label);
+    expect(labels).toContain("actions");
+    expect(labels).not.toContain("copilot-requests");
+  });
+});
+
+describe("service container command/entrypoint completion", () => {
+  it("suggests entrypoint and command in service container", async () => {
+    const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    services:
+      redis:
+        image: redis
+        |`;
+    const result = await complete(...getPositionFromCursor(input));
+
+    expect(result).not.toBeUndefined();
+    const labels = result.map(x => x.label);
+    expect(labels).toContain("entrypoint");
+    expect(labels).toContain("command");
+  });
+
+  it("does not suggest entrypoint and command in job container", async () => {
+    const input = `on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container:
+      image: node:20
+      |`;
+    const result = await complete(...getPositionFromCursor(input));
+
+    expect(result).not.toBeUndefined();
+    const labels = result.map(x => x.label);
+    expect(labels).not.toContain("entrypoint");
+    expect(labels).not.toContain("command");
+  });
+});

languageservice/src/complete.ts

@@ -1,8 +1,10 @@
 import {complete as completeExpression, DescriptionDictionary, FeatureFlags} from "@actions/expressions";
 import {CompletionItem as ExpressionCompletionItem} from "@actions/expressions/completion";
+import {FunctionInfo} from "@actions/expressions/funcs/info";
 import {isBasicExpression, isSequence, isString} from "@actions/workflow-parser";
 import {getActionSchema} from "@actions/workflow-parser/actions/action-schema";
 import {ErrorPolicy} from "@actions/workflow-parser/model/convert";
+import {splitAllowedContext} from "@actions/workflow-parser/templates/allowed-context";
 import {DefinitionType} from "@actions/workflow-parser/templates/schema/definition-type";
 import {OneOfDefinition} from "@actions/workflow-parser/templates/schema/one-of-definition";
 import {TemplateSchema} from "@actions/workflow-parser/templates/schema/template-schema";
@@ -19,6 +21,7 @@ import {CompletionItem, CompletionItemKind, CompletionItemTag, Range, TextEdit}
 import {filterActionRunsCompletions, getActionScaffoldingSnippets} from "./complete-action.js";
 import {ContextProviderConfig} from "./context-providers/config.js";
 import {getActionExpressionContext, getWorkflowExpressionContext, Mode} from "./context-providers/default.js";
+import {getFunctionDescription} from "./context-providers/descriptions.js";
 import {ActionContext, getActionContext} from "./context/action-context.js";
 import {getWorkflowContext, WorkflowContext} from "./context/workflow-context.js";
 import {validatorFunctions} from "./expression-validation/functions.js";
@@ -113,7 +116,8 @@ export async function complete(
       config,
       {
         fetchReusableWorkflowDepth: config?.fileProvider ? 1 : 0,
-        errorPolicy: ErrorPolicy.TryConversion
+        errorPolicy: ErrorPolicy.TryConversion,
+        featureFlags: config?.featureFlags
       },
       true
     );
@@ -121,18 +125,24 @@ export async function complete(
   }
 
   // Expression completions
-  if (token && (isBasicExpression(token) || isPotentiallyExpression(token))) {
+  if (token && (isBasicExpression(token) || isPotentiallyExpression(token, isAction))) {
     const allowedContext = token.definitionInfo?.allowedContext || [];
+    const {namedContexts, functions: extensionFunctions} = splitAllowedContext(allowedContext);
     const context = isAction
-      ? getActionExpressionContext(allowedContext, config?.contextProviderConfig, actionContext, Mode.Completion)
+      ? getActionExpressionContext(namedContexts, config?.contextProviderConfig, actionContext, Mode.Completion)
       : await getWorkflowExpressionContext(
-          allowedContext,
+          namedContexts,
           config?.contextProviderConfig,
           workflowContext,
           Mode.Completion
         );
 
-    return getExpressionCompletionItems(token, context, newPos, config?.featureFlags);
+    // Populate function descriptions for completion display
+    for (const func of extensionFunctions) {
+      func.description = getFunctionDescription(func.name);
+    }
+
+    return getExpressionCompletionItems(token, context, extensionFunctions, newPos, config?.featureFlags);
   }
 
   const indentation = guessIndentation(newDoc, 2, true); // Use 2 spaces as default and most common for YAML
@@ -154,16 +164,18 @@ export async function complete(
     values = filterActionRunsCompletions(values, path, parsedTemplate.value);
   }
 
+  // Filter `copilot-requests` from permissions completions when the feature flag is disabled
+  if (
+    !config?.featureFlags?.isEnabled("allowCopilotRequestsPermission") &&
+    parent?.definition?.key === "permissions-mapping"
+  ) {
+    values = values.filter(v => v.label !== "copilot-requests");
+  }
+
   // Offer "(switch to list)" / "(switch to mapping)" when the schema allows alternative forms
   const escapeHatches = getEscapeHatchCompletions(token, keyToken, indentString, newPos, schema);
   values.push(...escapeHatches);
 
-  // Get action scaffolding snippets if applicable
-  let actionSnippets: CompletionItem[] = [];
-  if (isAction && config?.featureFlags?.isEnabled("actionScaffoldingSnippets")) {
-    actionSnippets = getActionScaffoldingSnippets(parsedTemplate.value, path, position);
-  }
-
   // Figure out what text to replace when the user picks a completion.
   // For example, if they typed `runs-|` and pick `runs-on`, we need to replace `runs-`.
   let replaceRange: Range | undefined;
@@ -191,6 +203,12 @@ export async function complete(
     }
   }
 
+  // Get action scaffolding snippets if applicable
+  let actionSnippets: CompletionItem[] = [];
+  if (isAction) {
+    actionSnippets = getActionScaffoldingSnippets(parsedTemplate.value, path, position, replaceRange);
+  }
+
   // Convert values to LSP CompletionItems
   const completionItems = values.map(value => {
     const newText = value.insertText || value.label;
@@ -521,6 +539,7 @@ export function getExistingValues(token: TemplateToken | null, parent: TemplateT
 function getExpressionCompletionItems(
   token: TemplateToken,
   context: DescriptionDictionary,
+  extensionFunctions: FunctionInfo[],
   pos: Position,
   featureFlags?: FeatureFlags
 ): CompletionItem[] {
@@ -541,8 +560,8 @@ function getExpressionCompletionItems(
   const expressionInput = (getExpressionInput(currentInput, cursorOffset) || "").trim();
 
   try {
-    return completeExpression(expressionInput, context, [], validatorFunctions, featureFlags).map(item =>
-      mapExpressionCompletionItem(item, currentInput[cursorOffset])
+    return completeExpression(expressionInput, context, extensionFunctions, validatorFunctions, featureFlags).map(
+      item => mapExpressionCompletionItem(item, currentInput[cursorOffset])
     );
   } catch (e) {
     error(`Error while completing expression: '${(e as Error)?.message || "<no details>"}'`);

languageservice/src/context-providers/default.ts

@@ -198,9 +198,13 @@ function getDefaultActionContext(
     case "runner":
       return getRunnerContext();
 
-    case "env":
-      // Actions can access env but we don't have runtime values
-      return new DescriptionDictionary();
+    case "env": {
+      // Actions can access env but we don't know what env vars the calling workflow defines
+      // Mark as incomplete to avoid false positive "Context access might be invalid" warnings
+      const envContext = new DescriptionDictionary();
+      envContext.complete = false;
+      return envContext;
+    }
 
     case "job": {
       // https://docs.github.com/en/actions/learn-github-actions/contexts#job-context
@@ -218,9 +222,13 @@ function getDefaultActionContext(
     case "strategy":
       return getStrategyContext();
 
-    case "matrix":
-      // Actions can access matrix context at runtime
-      return new DescriptionDictionary();
+    case "matrix": {
+      // Actions can access matrix context at runtime but we don't know the calling workflow's matrix
+      // Mark as incomplete to avoid false positive "Context access might be invalid" warnings
+      const matrixContext = new DescriptionDictionary();
+      matrixContext.complete = false;
+      return matrixContext;
+    }
   }
 
   return undefined;

languageservice/src/context-providers/descriptions.json

@@ -105,13 +105,6 @@
     "job": {
       "description": "The [`job_id`](https://docs.github.com/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_id) of the current job.\nNote: This context property is set by the Actions runner, and is only available within the execution `steps` of a job. Otherwise, the value of this property will be `null`."
     },
-    "job_workflow_sha": {
-      "description": "For jobs using a reusable workflow, the commit SHA for the reusable workflow file.",
-      "versions": {
-        "ghes": ">=3.9",
-        "ghae": ">=3.9"
-      }
-    },
     "path": {
       "description": "Path on the runner to the file that sets system PATH variables from workflow commands. This file is unique to the current step and is a different file for each step in a job. For more information, see \"[Workflow commands for GitHub Actions](https://docs.github.com/actions/using-workflows/workflow-commands-for-github-actions#adding-a-system-path).\""
     },
@@ -225,6 +218,18 @@
     },
     "check_run_id": {
       "description": "The unique identifier of the check run for this job."
+    },
+    "workflow_file_path": {
+      "description": "The path of the workflow file that contains the job. For example, `.github/workflows/my-workflow.yml`."
+    },
+    "workflow_ref": {
+      "description": "The ref path to the workflow file that contains the job. For example, `octocat/hello-world/.github/workflows/my-workflow.yml@refs/heads/my_branch`."
+    },
+    "workflow_repository": {
+      "description": "The owner and repository name of the workflow file that contains the job. For example, `octocat/Hello-World`."
+    },
+    "workflow_sha": {
+      "description": "The commit SHA of the workflow file that contains the job."
     }
   },
   "secrets": {

languageservice/src/context-providers/github.ts

@@ -29,7 +29,6 @@ export function getGithubContext(workflowContext: WorkflowContext | undefined, m
     "graphql_url",
     "head_ref",
     "job",
-    "job_workflow_sha",
     "path",
     "ref",
     "ref_name",

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

@@ -18,12 +18,16 @@ describe("job context", () => {
     expect(context.pairs().length).toBe(0);
   });
 
-  it("returns status and check_run_id when job has no container or services", () => {
+  it("returns status, check_run_id, and workflow fields when job has no container or services", () => {
     const workflowContext = {job: {}} as WorkflowContext;
     const context = getJobContext(workflowContext);
 
     expect(context.get("status")).toBeDefined();
     expect(context.get("check_run_id")).toBeDefined();
+    expect(context.get("workflow_ref")).toBeDefined();
+    expect(context.get("workflow_sha")).toBeDefined();
+    expect(context.get("workflow_repository")).toBeDefined();
+    expect(context.get("workflow_file_path")).toBeDefined();
     expect(context.get("container")).toBeUndefined();
     expect(context.get("services")).toBeUndefined();
   });
@@ -173,4 +177,21 @@ describe("job context", () => {
       expect(redis.getDescription("ports")).toBeDefined();
     });
   });
+
+  describe("workflow context fields", () => {
+    it("includes workflow context fields with descriptions", () => {
+      const workflowContext = {job: {}} as WorkflowContext;
+      const context = getJobContext(workflowContext);
+
+      expect(context.get("workflow_ref")).toBeDefined();
+      expect(context.get("workflow_sha")).toBeDefined();
+      expect(context.get("workflow_repository")).toBeDefined();
+      expect(context.get("workflow_file_path")).toBeDefined();
+
+      expect(context.getDescription("workflow_ref")).toBeDefined();
+      expect(context.getDescription("workflow_sha")).toBeDefined();
+      expect(context.getDescription("workflow_repository")).toBeDefined();
+      expect(context.getDescription("workflow_file_path")).toBeDefined();
+    });
+  });
 });

languageservice/src/context-providers/job.ts

@@ -5,7 +5,7 @@ import {WorkflowContext} from "../context/workflow-context.js";
 import {getDescription} from "./descriptions.js";
 
 /**
- * Returns the job context with container, services, status, and check_run_id.
+ * Returns the job context with container, services, status, check_run_id, and workflow identity fields.
  */
 export function getJobContext(workflowContext: WorkflowContext): DescriptionDictionary {
   // https://docs.github.com/en/actions/learn-github-actions/contexts#job-context
@@ -42,6 +42,12 @@ export function getJobContext(workflowContext: WorkflowContext): DescriptionDict
   // Check run ID
   jobContext.add("check_run_id", new data.StringData(""), getDescription("job", "check_run_id"));
 
+  // Workflow context fields (populated at runtime for reusable workflow jobs)
+  jobContext.add("workflow_file_path", new data.StringData(""), getDescription("job", "workflow_file_path"));
+  jobContext.add("workflow_ref", new data.StringData(""), getDescription("job", "workflow_ref"));
+  jobContext.add("workflow_repository", new data.StringData(""), getDescription("job", "workflow_repository"));
+  jobContext.add("workflow_sha", new data.StringData(""), getDescription("job", "workflow_sha"));
+
   return jobContext;
 }
 

languageservice/src/hover.test.ts

@@ -120,7 +120,9 @@ jobs:
 `;
     const result = await hover(...getPositionFromCursor(input));
     expect(result).not.toBeUndefined();
-    expect(result?.contents).toEqual("");
+    expect(result?.contents).toEqual(
+      "A cron expression that represents a schedule. A scheduled workflow will run at most once every 5 minutes."
+    );
   });
 
   it("on an invalid cron schedule", async () => {
@@ -130,7 +132,9 @@ jobs:
 `;
     const result = await hover(...getPositionFromCursor(input));
     expect(result).not.toBeUndefined();
-    expect(result?.contents).toEqual("");
+    expect(result?.contents).toEqual(
+      "A cron expression that represents a schedule. A scheduled workflow will run at most once every 5 minutes."
+    );
   });
 
   it("shows context inherited from parent nodes", async () => {
@@ -195,7 +199,7 @@ jobs:
     const result = await hover(...getPositionFromCursor(input), testHoverConfig("uses", "step-uses", undefined));
     expect(result).not.toBeUndefined();
     expect(result?.contents).toEqual(
-      "Selects an action to run as part of a step in your job. An action is a reusable unit of code. You can use an action defined in the same repository as the workflow, a public repository, or in a published Docker container image."
+      "Selects an action to run as part of a step in your job. An action is a reusable unit of code. You can use an action defined in the same repository as the workflow, a public repository, a [private repository with access enabled](https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/enabling-features-for-your-repository/managing-github-actions-settings-for-a-repository#allowing-access-to-components-in-a-private-repository), or in a published Docker container image."
     );
   });
 });

languageservice/src/hover.ts

@@ -71,7 +71,7 @@ export async function hover(document: TextDocument, position: Position, config?:
   // Early exit if there's nothing to provide hover for
   const hoverToken = token || keyToken;
   const isExpressionHover =
-    token && tokenDefinitionInfo && (isBasicExpression(token) || isPotentiallyExpression(token));
+    token && tokenDefinitionInfo && (isBasicExpression(token) || isPotentiallyExpression(token, isAction));
   if (!isExpressionHover && !hoverToken?.definition) {
     return null;
   }

languageservice/src/utils/expression-detection.test.ts

@@ -0,0 +1,170 @@
+import {isPotentiallyExpression} from "./expression-detection.js";
+import {TemplateToken} from "@actions/workflow-parser/templates/tokens/template-token";
+import {TokenType} from "@actions/workflow-parser/templates/tokens/types";
+import {Definition} from "@actions/workflow-parser/templates/schema/definition";
+
+// Helper to create a mock TemplateToken with the properties we need to test
+function createMockToken(options: {value?: string; definitionKey?: string; isString?: boolean}): TemplateToken {
+  const {value = "", definitionKey, isString = true} = options;
+
+  const mockDefinition = definitionKey ? ({key: definitionKey} as Definition) : undefined;
+
+  return {
+    value: isString ? value : undefined,
+    definition: mockDefinition,
+    templateTokenType: isString ? TokenType.String : TokenType.Mapping,
+    // Required by isString type guard (isLiteral checks isLiteral property)
+    isLiteral: isString,
+    isScalar: isString
+  } as unknown as TemplateToken;
+}
+
+describe("isPotentiallyExpression", () => {
+  describe("expression markers", () => {
+    it("returns true when token value contains ${{", () => {
+      const token = createMockToken({value: "${{ github.actor }}"});
+      expect(isPotentiallyExpression(token, false)).toBe(true);
+      expect(isPotentiallyExpression(token, true)).toBe(true);
+    });
+
+    it("returns true when token value contains embedded ${{", () => {
+      const token = createMockToken({value: "Hello ${{ github.actor }}!"});
+      expect(isPotentiallyExpression(token, false)).toBe(true);
+      expect(isPotentiallyExpression(token, true)).toBe(true);
+    });
+
+    it("returns false when token value does not contain ${{", () => {
+      const token = createMockToken({value: "plain text"});
+      expect(isPotentiallyExpression(token, false)).toBe(false);
+      expect(isPotentiallyExpression(token, true)).toBe(false);
+    });
+
+    it("returns false for non-string tokens without expression marker", () => {
+      const token = createMockToken({isString: false});
+      expect(isPotentiallyExpression(token, false)).toBe(false);
+      expect(isPotentiallyExpression(token, true)).toBe(false);
+    });
+  });
+
+  describe("workflow schema if-conditions", () => {
+    it("returns true for job-if definition in workflow", () => {
+      const token = createMockToken({value: "success()", definitionKey: "job-if"});
+      expect(isPotentiallyExpression(token, false)).toBe(true);
+    });
+
+    it("returns false for job-if definition in action (not valid in action schema)", () => {
+      const token = createMockToken({value: "success()", definitionKey: "job-if"});
+      expect(isPotentiallyExpression(token, true)).toBe(false);
+    });
+
+    it("returns true for step-if definition in workflow", () => {
+      const token = createMockToken({value: "failure()", definitionKey: "step-if"});
+      expect(isPotentiallyExpression(token, false)).toBe(true);
+    });
+
+    it("returns true for snapshot-if definition in workflow", () => {
+      const token = createMockToken({value: "always()", definitionKey: "snapshot-if"});
+      expect(isPotentiallyExpression(token, false)).toBe(true);
+    });
+
+    it("returns false for snapshot-if definition in action (not valid in action schema)", () => {
+      const token = createMockToken({value: "always()", definitionKey: "snapshot-if"});
+      expect(isPotentiallyExpression(token, true)).toBe(false);
+    });
+  });
+
+  describe("action schema if-conditions", () => {
+    describe("composite action step if (run and uses)", () => {
+      it("returns true for step-if definition in action", () => {
+        const token = createMockToken({value: "success()", definitionKey: "step-if"});
+        expect(isPotentiallyExpression(token, true)).toBe(true);
+      });
+
+      it("returns true for step-if with run step condition", () => {
+        // Composite action run step: if condition
+        const token = createMockToken({value: "github.event_name == 'push'", definitionKey: "step-if"});
+        expect(isPotentiallyExpression(token, true)).toBe(true);
+      });
+
+      it("returns true for step-if with uses step condition", () => {
+        // Composite action uses step: if condition
+        const token = createMockToken({value: "runner.os == 'Linux'", definitionKey: "step-if"});
+        expect(isPotentiallyExpression(token, true)).toBe(true);
+      });
+    });
+
+    describe("pre-if and post-if (node/docker actions)", () => {
+      it("returns true for runs-if definition in action (pre-if)", () => {
+        const token = createMockToken({value: "runner.os == 'Linux'", definitionKey: "runs-if"});
+        expect(isPotentiallyExpression(token, true)).toBe(true);
+      });
+
+      it("returns true for runs-if definition in action (post-if)", () => {
+        const token = createMockToken({value: "always()", definitionKey: "runs-if"});
+        expect(isPotentiallyExpression(token, true)).toBe(true);
+      });
+
+      it("returns false for runs-if definition in workflow (not valid in workflow schema)", () => {
+        const token = createMockToken({value: "always()", definitionKey: "runs-if"});
+        expect(isPotentiallyExpression(token, false)).toBe(false);
+      });
+    });
+  });
+
+  describe("mixed scenarios", () => {
+    it("returns true when expression marker present even if definition is not if-related", () => {
+      const token = createMockToken({value: "${{ github.actor }}", definitionKey: "some-other-definition"});
+      expect(isPotentiallyExpression(token, false)).toBe(true);
+      expect(isPotentiallyExpression(token, true)).toBe(true);
+    });
+
+    it("returns true when both expression marker and if definition present", () => {
+      const token = createMockToken({value: "${{ success() }}", definitionKey: "step-if"});
+      expect(isPotentiallyExpression(token, false)).toBe(true);
+      expect(isPotentiallyExpression(token, true)).toBe(true);
+    });
+
+    it("returns false for plain text with non-if definition", () => {
+      const token = createMockToken({value: "plain text", definitionKey: "string"});
+      expect(isPotentiallyExpression(token, false)).toBe(false);
+      expect(isPotentiallyExpression(token, true)).toBe(false);
+    });
+
+    it("returns false when token has no definition and no expression marker", () => {
+      const token = createMockToken({value: "plain text"});
+      expect(isPotentiallyExpression(token, false)).toBe(false);
+      expect(isPotentiallyExpression(token, true)).toBe(false);
+    });
+  });
+
+  describe("edge cases", () => {
+    it("handles empty string value", () => {
+      const token = createMockToken({value: ""});
+      expect(isPotentiallyExpression(token, false)).toBe(false);
+      expect(isPotentiallyExpression(token, true)).toBe(false);
+    });
+
+    it("handles expression marker as if-condition value", () => {
+      const token = createMockToken({value: "${{ always() }}", definitionKey: "job-if"});
+      expect(isPotentiallyExpression(token, false)).toBe(true);
+      // For action, job-if is not valid, but ${{ is present
+      expect(isPotentiallyExpression(token, true)).toBe(true);
+    });
+
+    it("handles partial expression marker", () => {
+      const token = createMockToken({value: "${incomplete"});
+      expect(isPotentiallyExpression(token, false)).toBe(false);
+      expect(isPotentiallyExpression(token, true)).toBe(false);
+    });
+
+    it("handles ${{ at different positions", () => {
+      const startToken = createMockToken({value: "${{ foo }} bar"});
+      const middleToken = createMockToken({value: "bar ${{ foo }} baz"});
+      const endToken = createMockToken({value: "bar ${{ foo }}"});
+
+      expect(isPotentiallyExpression(startToken, false)).toBe(true);
+      expect(isPotentiallyExpression(middleToken, false)).toBe(true);
+      expect(isPotentiallyExpression(endToken, false)).toBe(true);
+    });
+  });
+});

languageservice/src/utils/expression-detection.ts

@@ -2,10 +2,36 @@ import {isString} from "@actions/workflow-parser";
 import {OPEN_EXPRESSION} from "@actions/workflow-parser/templates/template-constants";
 import {TemplateToken} from "@actions/workflow-parser/templates/tokens/index";
 
-export function isPotentiallyExpression(token: TemplateToken): boolean {
-  const containsExpression = isString(token) && token.value != null && token.value.indexOf(OPEN_EXPRESSION) >= 0;
-  // If conditions are always expressions (job-if, step-if, snapshot-if)
-  const definitionKey = token.definition?.key;
-  const isIfCondition = definitionKey === "job-if" || definitionKey === "step-if" || definitionKey === "snapshot-if";
-  return containsExpression || isIfCondition;
+/**
+ * Workflow schema if-condition definition keys.
+ * - job-if: job level if condition
+ * - step-if: step level if condition
+ * - snapshot-if: snapshot if condition
+ */
+const WORKFLOW_IF_DEFINITIONS = new Set(["job-if", "step-if", "snapshot-if"]);
+
+/**
+ * Action schema if-condition definition keys.
+ * - step-if: composite action step if condition (run-step and uses-step)
+ * - runs-if: pre-if and post-if at the runs level (node/docker actions)
+ */
+const ACTION_IF_DEFINITIONS = new Set(["step-if", "runs-if"]);
+
+export function isPotentiallyExpression(token: TemplateToken, isAction: boolean): boolean {
+  // Check if token contains expression syntax
+  if (isString(token) && token.value != null && token.value.indexOf(OPEN_EXPRESSION) >= 0) {
+    return true;
+  }
+
+  // Check if token is an if-condition (always treated as expressions)
+  if (!token.definition?.key) {
+    return false;
+  }
+
+  // Definition keys differ between workflow and action schemas
+  if (isAction) {
+    return ACTION_IF_DEFINITIONS.has(token.definition.key);
+  } else {
+    return WORKFLOW_IF_DEFINITIONS.has(token.definition.key);
+  }
 }

languageservice/src/utils/validate-if.ts

@@ -0,0 +1,65 @@
+/**
+ * Shared validation utilities for `if` condition literal text detection.
+ * Used by both workflow and action validation.
+ */
+
+import {data} from "@actions/expressions";
+import {Expr, FunctionCall, Literal, Logical} from "@actions/expressions/ast";
+
+/**
+ * Checks if a format function contains literal text in its format string.
+ * This indicates user confusion about how expressions work.
+ *
+ * Example: format('push == {0}', github.event_name)
+ * The literal text "push == " will always evaluate to truthy.
+ *
+ * @param expr The expression to check
+ * @returns true if the expression is a format() call with literal text
+ */
+export function hasFormatWithLiteralText(expr: Expr): boolean {
+  // If this is a logical AND expression (from ensureStatusFunction wrapping)
+  // check the right side for the format call
+  if (expr instanceof Logical && expr.operator.lexeme === "&&" && expr.args.length === 2) {
+    return hasFormatWithLiteralText(expr.args[1]);
+  }
+
+  if (!(expr instanceof FunctionCall)) {
+    return false;
+  }
+
+  // Check if this is a format function
+  if (expr.functionName.lexeme.toLowerCase() !== "format") {
+    return false;
+  }
+
+  // Check if the first argument is a string literal
+  if (expr.args.length < 1) {
+    return false;
+  }
+
+  const firstArg = expr.args[0];
+  if (!(firstArg instanceof Literal) || firstArg.literal.kind !== data.Kind.String) {
+    return false;
+  }
+
+  // Get the format string and trim whitespace
+  const formatString = firstArg.literal.coerceString();
+  const trimmed = formatString.trim();
+
+  // Check if there's literal text (non-replacement tokens) after trimming
+  let inToken = false;
+  for (let i = 0; i < trimmed.length; i++) {
+    if (!inToken && trimmed[i] === "{") {
+      inToken = true;
+    } else if (inToken && trimmed[i] === "}") {
+      inToken = false;
+    } else if (inToken && trimmed[i] >= "0" && trimmed[i] <= "9") {
+      // OK - this is a replacement token like {0}, {1}, etc.
+    } else {
+      // Found literal text
+      return true;
+    }
+  }
+
+  return false;
+}

languageservice/src/utils/validate-uses.ts

@@ -0,0 +1,118 @@
+/**
+ * Shared validation utilities for step `uses` field format.
+ * Used by both workflow and action validation.
+ */
+
+import {Diagnostic, DiagnosticSeverity} from "vscode-languageserver-types";
+import {StringToken} from "@actions/workflow-parser/templates/tokens/string-token";
+import {mapRange} from "./range.js";
+
+// Matches a short SHA (7-8 hex characters) that looks like it should be a full SHA
+const SHORT_SHA_PATTERN = /^[0-9a-f]{7,8}$/i;
+const SHORT_SHA_DOCS_URL =
+  "https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-third-party-actions";
+
+/**
+ * Checks if a ref looks like a short SHA and adds a warning if so.
+ * Returns true if a warning was added.
+ */
+export function warnIfShortSha(diagnostics: Diagnostic[], token: StringToken, ref: string): boolean {
+  if (SHORT_SHA_PATTERN.test(ref)) {
+    diagnostics.push({
+      message: `The provided ref '${ref}' may be a shortened commit SHA. If so, please use the full 40-character commit SHA instead, as short SHAs are not supported.`,
+      severity: DiagnosticSeverity.Warning,
+      range: mapRange(token.range),
+      code: "short-sha-ref",
+      codeDescription: {
+        href: SHORT_SHA_DOCS_URL
+      }
+    });
+    return true;
+  }
+  return false;
+}
+
+/**
+ * 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}
+ */
+export 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;
+  }
+
+  // Warn if ref looks like a short SHA
+  warnIfShortSha(diagnostics, token, gitRef);
+}
+
+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"
+  });
+}

languageservice/src/validate-action.test.ts

@@ -527,4 +527,739 @@ runs:
       expect(diagnostics.some(d => d.message.includes("is not valid for"))).toBe(false);
     });
   });
+
+  describe("composite step uses format validation", () => {
+    it("validates valid uses format with version", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Uses another action
+runs:
+  using: composite
+  steps:
+    - uses: actions/checkout@v4
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "invalid-uses-format")).toBe(false);
+    });
+
+    it("validates docker:// uses format", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Uses docker image
+runs:
+  using: composite
+  steps:
+    - uses: docker://alpine:3.14
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "invalid-uses-format")).toBe(false);
+    });
+
+    it("validates local ./ uses format", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Uses local action
+runs:
+  using: composite
+  steps:
+    - uses: ./local-action
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "invalid-uses-format")).toBe(false);
+    });
+
+    it("errors on missing @ref", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Missing version
+runs:
+  using: composite
+  steps:
+    - uses: actions/checkout
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "invalid-uses-format")).toBe(true);
+      expect(diagnostics.some(d => d.message.includes("Expected format"))).toBe(true);
+    });
+
+    it("errors on invalid format", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Invalid format
+runs:
+  using: composite
+  steps:
+    - uses: invalid-format
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "invalid-uses-format")).toBe(true);
+    });
+
+    it("warns on short SHA", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Short SHA
+runs:
+  using: composite
+  steps:
+    - uses: actions/checkout@a1b2c3d
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "short-sha-ref")).toBe(true);
+      expect(diagnostics.some(d => d.message.includes("shortened commit SHA"))).toBe(true);
+    });
+
+    it("allows full SHA", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Full SHA
+runs:
+  using: composite
+  steps:
+    - uses: actions/checkout@a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4e5f6a1b2
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "short-sha-ref")).toBe(false);
+    });
+
+    it("errors on reusable workflow in step uses", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Wrong workflow reference
+runs:
+  using: composite
+  steps:
+    - uses: owner/repo/.github/workflows/build.yml@main
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Reusable workflows should be referenced"))).toBe(true);
+    });
+  });
+
+  describe("composite step if literal text validation", () => {
+    it("errors when literal text mixed with embedded expression", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Literal text in if
+runs:
+  using: composite
+  steps:
+    - if: push == \${{ github.event_name }}
+      run: echo hi
+      shell: bash
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "expression-literal-text-in-condition")).toBe(true);
+      expect(diagnostics.some(d => d.message.includes("literal text outside replacement tokens"))).toBe(true);
+    });
+
+    it("allows valid expression in if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Valid if expression
+runs:
+  using: composite
+  steps:
+    - if: \${{ github.event_name == 'push' }}
+      run: echo hi
+      shell: bash
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "expression-literal-text-in-condition")).toBe(false);
+    });
+
+    it("allows if without expression markers (auto-wrapped)", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: If without markers
+runs:
+  using: composite
+  steps:
+    - if: github.event_name == 'push'
+      run: echo hi
+      shell: bash
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "expression-literal-text-in-condition")).toBe(false);
+    });
+
+    it("allows success() function", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Success function
+runs:
+  using: composite
+  steps:
+    - if: success()
+      run: echo hi
+      shell: bash
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "expression-literal-text-in-condition")).toBe(false);
+    });
+
+    it("errors on format with literal text in if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Format with literal text
+runs:
+  using: composite
+  steps:
+    - if: \${{ format('event is {0}', github.event_name) }}
+      run: echo hi
+      shell: bash
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "expression-literal-text-in-condition")).toBe(true);
+    });
+
+    it("allows format with only replacement tokens", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Format with only tokens
+runs:
+  using: composite
+  steps:
+    - if: \${{ format('{0}', github.event_name) }}
+      run: echo hi
+      shell: bash
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "expression-literal-text-in-condition")).toBe(false);
+    });
+
+    it("validates if in uses-step", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: If in uses step
+runs:
+  using: composite
+  steps:
+    - if: push == \${{ github.event_name }}
+      uses: actions/checkout@v4
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "expression-literal-text-in-condition")).toBe(true);
+    });
+  });
+
+  describe("pre-if and post-if validation", () => {
+    it("errors on explicit expression with literal text in pre-if for node action", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Literal text in pre-if
+runs:
+  using: node20
+  main: index.js
+  pre: setup.js
+  pre-if: push == \${{ github.event_name }}
+`);
+      const diagnostics = await validate(doc);
+      // Explicit ${{ }} syntax is not allowed for pre-if, so we get that error
+      expect(diagnostics.some(d => d.code === "explicit-expression-not-allowed")).toBe(true);
+    });
+
+    it("errors on explicit expression with literal text in post-if for node action", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Literal text in post-if
+runs:
+  using: node20
+  main: index.js
+  post: cleanup.js
+  post-if: event == \${{ github.event_name }}
+`);
+      const diagnostics = await validate(doc);
+      // Explicit ${{ }} syntax is not allowed for post-if, so we get that error
+      expect(diagnostics.some(d => d.code === "explicit-expression-not-allowed")).toBe(true);
+    });
+
+    it("errors on explicit expression with literal text in pre-if for docker action", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Literal text in pre-if
+runs:
+  using: docker
+  image: Dockerfile
+  pre-entrypoint: /setup.sh
+  pre-if: push == \${{ github.event_name }}
+`);
+      const diagnostics = await validate(doc);
+      // Explicit ${{ }} syntax is not allowed for pre-if, so we get that error
+      expect(diagnostics.some(d => d.code === "explicit-expression-not-allowed")).toBe(true);
+    });
+
+    it("errors on explicit expression with literal text in post-if for docker action", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Literal text in post-if
+runs:
+  using: docker
+  image: Dockerfile
+  post-entrypoint: /cleanup.sh
+  post-if: event == \${{ github.event_name }}
+`);
+      const diagnostics = await validate(doc);
+      // Explicit ${{ }} syntax is not allowed for post-if, so we get that error
+      expect(diagnostics.some(d => d.code === "explicit-expression-not-allowed")).toBe(true);
+    });
+
+    it("allows valid expression in pre-if for node action", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Valid pre-if
+runs:
+  using: node20
+  main: index.js
+  pre: setup.js
+  pre-if: success()
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "expression-literal-text-in-condition")).toBe(false);
+    });
+
+    it("allows valid expression in post-if for node action", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Valid post-if
+runs:
+  using: node20
+  main: index.js
+  post: cleanup.js
+  post-if: always()
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "expression-literal-text-in-condition")).toBe(false);
+    });
+
+    it("errors on explicit expression syntax in pre-if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Explicit expression in pre-if
+runs:
+  using: node20
+  main: index.js
+  pre: setup.js
+  pre-if: \${{ runner.os == 'Windows' }}
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "explicit-expression-not-allowed")).toBe(true);
+      expect(diagnostics.some(d => d.message.includes("pre-if"))).toBe(true);
+    });
+
+    it("errors on explicit expression syntax in post-if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Explicit expression in post-if
+runs:
+  using: node20
+  main: index.js
+  post: cleanup.js
+  post-if: \${{ always() }}
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "explicit-expression-not-allowed")).toBe(true);
+      expect(diagnostics.some(d => d.message.includes("post-if"))).toBe(true);
+    });
+
+    it("allows expression with failure() in post-if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Valid post-if
+runs:
+  using: node20
+  main: index.js
+  post: cleanup.js
+  post-if: failure()
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "expression-literal-text-in-condition")).toBe(false);
+    });
+
+    it("allows expression with cancelled() in post-if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Valid post-if
+runs:
+  using: node20
+  main: index.js
+  post: cleanup.js
+  post-if: cancelled()
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "expression-literal-text-in-condition")).toBe(false);
+    });
+  });
+
+  describe("format string validation", () => {
+    it("errors on format() with too few arguments in composite step if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Format mismatch
+runs:
+  using: composite
+  steps:
+    - if: format('{0} {1}', 'only-one')
+      run: echo hi
+      shell: bash
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "format-arg-count-mismatch")).toBe(true);
+    });
+
+    it("errors on invalid format string in composite step if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Invalid format
+runs:
+  using: composite
+  steps:
+    - if: format('{', 'arg')
+      run: echo hi
+      shell: bash
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "invalid-format-string")).toBe(true);
+    });
+
+    it("errors on format() with too few arguments in pre-if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Format mismatch in pre-if
+runs:
+  using: node20
+  main: index.js
+  pre: setup.js
+  pre-if: format('{0} {1}', 'only-one')
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "format-arg-count-mismatch")).toBe(true);
+    });
+
+    it("errors on format() with too few arguments in post-if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Format mismatch in post-if
+runs:
+  using: node20
+  main: index.js
+  post: cleanup.js
+  post-if: format('{0} {1} {2}', 'a', 'b')
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "format-arg-count-mismatch")).toBe(true);
+    });
+
+    it("allows valid format() call in composite step if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Valid format
+runs:
+  using: composite
+  steps:
+    - if: format('{0} {1}', 'a', 'b') == 'a b'
+      run: echo hi
+      shell: bash
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "format-arg-count-mismatch")).toBe(false);
+      expect(diagnostics.some(d => d.code === "invalid-format-string")).toBe(false);
+    });
+
+    it("allows valid format() call in pre-if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Valid format in pre-if
+runs:
+  using: node20
+  main: index.js
+  pre: setup.js
+  pre-if: format('{0}', runner.os) == 'Linux'
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "format-arg-count-mismatch")).toBe(false);
+      expect(diagnostics.some(d => d.code === "invalid-format-string")).toBe(false);
+    });
+
+    it("errors on format() with too few arguments in run expression", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Format mismatch in run
+runs:
+  using: composite
+  steps:
+    - run: echo \${{ format('{0} {1}', 'only-one') }}
+      shell: bash
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "format-arg-count-mismatch")).toBe(true);
+    });
+
+    it("errors on format() with too few arguments in input default", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Format mismatch in input default
+inputs:
+  greeting:
+    description: Greeting message
+    default: \${{ format('{0} {1}', 'hello') }}
+runs:
+  using: node20
+  main: index.js
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.code === "format-arg-count-mismatch")).toBe(true);
+    });
+  });
+
+  describe("if condition context validation", () => {
+    it("warns on unknown context in composite step if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Unknown context in if
+runs:
+  using: composite
+  steps:
+    - if: foo == bar
+      run: echo hi
+      shell: bash
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized named-value"))).toBe(true);
+    });
+
+    it("warns on unknown context in pre-if for node action", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Unknown context in pre-if
+runs:
+  using: node20
+  main: index.js
+  pre: setup.js
+  pre-if: foo == bar
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized named-value"))).toBe(true);
+    });
+
+    it("warns on unknown context in post-if for node action", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Unknown context in post-if
+runs:
+  using: node20
+  main: index.js
+  post: cleanup.js
+  post-if: foo == bar
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized named-value"))).toBe(true);
+    });
+
+    it("warns on unknown context in pre-if for docker action", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Unknown context in pre-if
+runs:
+  using: docker
+  image: Dockerfile
+  pre-entrypoint: /setup.sh
+  pre-if: foo == bar
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized named-value"))).toBe(true);
+    });
+
+    it("warns on unknown context in post-if for docker action", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Unknown context in post-if
+runs:
+  using: docker
+  image: Dockerfile
+  post-entrypoint: /cleanup.sh
+  post-if: foo == bar
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized named-value"))).toBe(true);
+    });
+
+    it("allows valid contexts in composite step if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Valid context in if
+runs:
+  using: composite
+  steps:
+    - if: github.event_name == 'push'
+      run: echo hi
+      shell: bash
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized named-value"))).toBe(false);
+    });
+
+    it("allows valid contexts in pre-if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Valid context in pre-if
+runs:
+  using: node20
+  main: index.js
+  pre: setup.js
+  pre-if: runner.os == 'Linux'
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized named-value"))).toBe(false);
+    });
+
+    it("allows valid contexts in post-if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Valid context in post-if
+runs:
+  using: node20
+  main: index.js
+  post: cleanup.js
+  post-if: runner.os == 'Linux'
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized named-value"))).toBe(false);
+    });
+
+    it("allows hashFiles function in composite step if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: hashFiles in if
+runs:
+  using: composite
+  steps:
+    - if: hashFiles('**/package-lock.json') != ''
+      run: echo hi
+      shell: bash
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized"))).toBe(false);
+    });
+
+    it("allows success, failure, always, cancelled functions in composite step if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Status functions in if
+runs:
+  using: composite
+  steps:
+    - if: success() && !cancelled()
+      run: echo success
+      shell: bash
+    - if: failure()
+      run: echo failure
+      shell: bash
+    - if: always()
+      run: echo always
+      shell: bash
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized"))).toBe(false);
+    });
+
+    it("allows hashFiles function in pre-if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: hashFiles in pre-if
+runs:
+  using: node20
+  main: index.js
+  pre: setup.js
+  pre-if: hashFiles('**/package-lock.json') != ''
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized"))).toBe(false);
+    });
+
+    it("allows status functions in post-if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Status functions in post-if
+runs:
+  using: node20
+  main: index.js
+  post: cleanup.js
+  post-if: always() || failure()
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized"))).toBe(false);
+    });
+
+    it("errors on unknown function in composite step if", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Unknown function in if
+runs:
+  using: composite
+  steps:
+    - if: unknownFunc()
+      run: echo hi
+      shell: bash
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized function"))).toBe(true);
+    });
+
+    it("errors on unknown function in pre-if for node action", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Unknown function in pre-if
+runs:
+  using: node20
+  main: index.js
+  pre: setup.js
+  pre-if: unknownFunc()
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized function"))).toBe(true);
+    });
+
+    it("errors on unknown function in post-if for node action", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Unknown function in post-if
+runs:
+  using: node20
+  main: index.js
+  post: cleanup.js
+  post-if: unknownFunc()
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized function"))).toBe(true);
+    });
+
+    it("errors on unknown function in pre-if for docker action", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Unknown function in pre-if
+runs:
+  using: docker
+  image: Dockerfile
+  pre-entrypoint: /setup.sh
+  pre-if: unknownFunc()
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized function"))).toBe(true);
+    });
+
+    it("errors on unknown function in post-if for docker action", async () => {
+      const doc = createActionDocument(`
+name: My Action
+description: Unknown function in post-if
+runs:
+  using: docker
+  image: Dockerfile
+  post-entrypoint: /cleanup.sh
+  post-if: unknownFunc()
+`);
+      const diagnostics = await validate(doc);
+      expect(diagnostics.some(d => d.message.includes("Unrecognized function"))).toBe(true);
+    });
+  });
 });

languageservice/src/validate-action.ts

@@ -2,20 +2,31 @@
  * Validation for action.yml / action.yaml manifest files
  */
 
-import {isMapping} from "@actions/workflow-parser";
+import {Lexer, Parser} from "@actions/expressions";
+import {Expr} from "@actions/expressions/ast";
+import {isMapping, isString} from "@actions/workflow-parser";
 import {isActionStep} from "@actions/workflow-parser/model/type-guards";
 import {ErrorPolicy} from "@actions/workflow-parser/model/convert";
+import {ActionTemplate} from "@actions/workflow-parser/actions/action-template";
+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";
 import {MappingToken} from "@actions/workflow-parser/templates/tokens/mapping-token";
 import {SequenceToken} from "@actions/workflow-parser/templates/tokens/sequence-token";
+import {StringToken} from "@actions/workflow-parser/templates/tokens/string-token";
 import {TemplateToken} from "@actions/workflow-parser/templates/tokens/template-token";
+import {TokenRange} from "@actions/workflow-parser/templates/tokens/token-range";
 import {TemplateValidationError} from "@actions/workflow-parser/templates/template-validation-error";
 import {File} from "@actions/workflow-parser/workflows/file";
 import {TextDocument} from "vscode-languageserver-textdocument";
 import {Diagnostic, DiagnosticSeverity} from "vscode-languageserver-types";
 import {error} from "./log.js";
 import {mapRange} from "./utils/range.js";
+import {hasFormatWithLiteralText} from "./utils/validate-if.js";
+import {validateStepUsesFormat} from "./utils/validate-uses.js";
 import {getOrConvertActionTemplate, getOrParseAction} from "./utils/workflow-cache.js";
 import {validateActionReference} from "./validate-action-reference.js";
+import {validateFormatCalls} from "./validate-format-string.js";
 import {ValidationConfig} from "./validate.js";
 
 /**
@@ -65,7 +76,15 @@ export async function validateAction(textDocument: TextDocument, config?: Valida
       return [];
     }
 
-    // Get schema errors
+    // Convert the action template (this may add validation errors for pre-if/post-if)
+    let template: ActionTemplate | undefined;
+    if (result.value) {
+      template = getOrConvertActionTemplate(result.context, result.value, textDocument.uri, {
+        errorPolicy: ErrorPolicy.TryConversion
+      });
+    }
+
+    // Get schema and conversion errors (must be after conversion to include conversion errors)
     const schemaErrors = result.context.errors.getErrors();
 
     // Run custom runs key validation, which also filters redundant schema errors in place
@@ -93,13 +112,9 @@ export async function validateAction(textDocument: TextDocument, config?: Valida
     }
 
     // Validate composite action steps if we have a parsed result
-    if (result.value) {
-      const template = getOrConvertActionTemplate(result.context, result.value, textDocument.uri, {
-        errorPolicy: ErrorPolicy.TryConversion
-      });
-
+    if (result.value && template) {
       // Only composite actions have steps to validate
-      if (template?.runs?.using === "composite") {
+      if (template.runs?.using === "composite") {
         const steps = template.runs.steps ?? [];
 
         // Find the steps sequence token from the raw parsed result
@@ -114,9 +129,17 @@ export async function validateAction(textDocument: TextDocument, config?: Valida
             if (isActionStep(step) && isMapping(stepToken)) {
               await validateActionReference(diagnostics, stepToken, step, config);
             }
+
+            // Validate step uses format
+            if (isMapping(stepToken)) {
+              validateStepUsesField(diagnostics, stepToken);
+            }
           }
         }
       }
+
+      // Single traversal for all expression validation (like workflow's additionalValidations)
+      validateAllTokens(diagnostics, result.value);
     }
   } catch (e) {
     error(`Unhandled error while validating action file: ${(e as Error).message}`);
@@ -125,6 +148,196 @@ export async function validateAction(textDocument: TextDocument, config?: Valida
   return diagnostics;
 }
 
+/**
+ * Validates the `uses` field format in a composite action step.
+ */
+function validateStepUsesField(diagnostics: Diagnostic[], stepToken: MappingToken): void {
+  for (let i = 0; i < stepToken.count; i++) {
+    const {key, value} = stepToken.get(i);
+    const keyStr = isString(key) ? key.value.toLowerCase() : "";
+
+    if (keyStr === "uses" && isString(value)) {
+      validateStepUsesFormat(diagnostics, value);
+    }
+  }
+}
+
+/**
+ * Single traversal validation for all tokens in the action template.
+ * This follows the same pattern as workflow validation's additionalValidations:
+ * - For BasicExpressionToken: validate format() calls
+ * - For StringToken on if conditions: validate literal text detection and format() calls
+ * - For pre-if/post-if with explicit ${{ }}: report error (not supported by runner)
+ *
+ * Context validation (unknown named values) is handled by workflow-parser during conversion.
+ */
+function validateAllTokens(diagnostics: Diagnostic[], root: TemplateToken): void {
+  for (const [parent, token] of TemplateToken.traverse(root)) {
+    const definitionKey = token.definition?.key;
+
+    // Validate all BasicExpressionToken instances for format() calls
+    if (token instanceof BasicExpressionToken && token.range) {
+      // Check for literal text in if conditions (format with literal text)
+      if (definitionKey === "step-if") {
+        validateIfLiteralText(diagnostics, token);
+      }
+
+      // Validate format() calls for all expressions
+      for (const expression of token.originalExpressions || [token]) {
+        validateExpressionFormatCalls(diagnostics, expression);
+      }
+
+      // Check for explicit ${{ }} in pre-if/post-if (not supported by runner)
+      if (definitionKey === "runs-if" && parent instanceof MappingToken) {
+        // Resolve the key name (pre-if or post-if) from parent mapping
+        let keyName: string | undefined;
+        for (let i = 0; i < parent.count; i++) {
+          const {key, value} = parent.get(i);
+          if (value === token) {
+            keyName = key.toString().toLowerCase();
+            break;
+          }
+        }
+
+        if (keyName) {
+          diagnostics.push({
+            message: `Explicit expression syntax \${{ }} is not supported for '${keyName}'. Remove the \${{ }} markers and use the expression directly.`,
+            range: mapRange(token.range),
+            severity: DiagnosticSeverity.Error,
+            code: "explicit-expression-not-allowed"
+          });
+        }
+      }
+    }
+
+    // Handle implicit if conditions (StringToken without ${{ }})
+    // These allow expression syntax without the markers
+    if (isString(token) && token.range) {
+      if (definitionKey === "step-if" || definitionKey === "runs-if") {
+        validateImplicitIfCondition(diagnostics, token);
+      }
+    }
+  }
+}
+
+const LITERAL_TEXT_IN_CONDITION_MESSAGE =
+  "Conditional expression contains literal text outside replacement tokens. This will cause the expression to always evaluate to truthy. Did you mean to put the entire expression inside ${{ }}?";
+const LITERAL_TEXT_IN_CONDITION_CODE = "expression-literal-text-in-condition";
+
+/**
+ * Validates an implicit if condition (StringToken without ${{ }}).
+ * Checks for literal text detection and validates format() calls.
+ */
+function validateImplicitIfCondition(diagnostics: Diagnostic[], token: StringToken): void {
+  const condition = token.value.trim();
+  if (!condition) {
+    return;
+  }
+
+  const allowedContext = token.definitionInfo?.allowedContext || [];
+  const {namedContexts, functions} = splitAllowedContext(allowedContext);
+
+  // Ensure the condition has a status function, wrapping if needed
+  const finalCondition = ensureStatusFunction(condition, token.definitionInfo);
+
+  try {
+    const l = new Lexer(finalCondition);
+    const lr = l.lex();
+    const p = new Parser(lr.tokens, namedContexts, functions);
+    const expr = p.parse();
+
+    // Check for literal text in the expression (format with literal text)
+    if (hasFormatWithLiteralText(expr)) {
+      diagnostics.push({
+        message: LITERAL_TEXT_IN_CONDITION_MESSAGE,
+        range: mapRange(token.range),
+        severity: DiagnosticSeverity.Error,
+        code: LITERAL_TEXT_IN_CONDITION_CODE
+      });
+    }
+
+    // Validate format() function calls
+    validateFormatCallsAndAddDiagnostics(diagnostics, expr, token.range);
+  } catch {
+    // Ignore parse errors - they'll be caught by schema validation or workflow-parser
+  }
+}
+
+/**
+ * Validates a BasicExpressionToken for literal text in if conditions.
+ */
+function validateIfLiteralText(diagnostics: Diagnostic[], token: BasicExpressionToken): void {
+  const allowedContext = token.definitionInfo?.allowedContext || [];
+  const {namedContexts, functions} = splitAllowedContext(allowedContext);
+
+  try {
+    const l = new Lexer(token.expression);
+    const lr = l.lex();
+    const p = new Parser(lr.tokens, namedContexts, functions);
+    const expr = p.parse();
+
+    if (hasFormatWithLiteralText(expr)) {
+      diagnostics.push({
+        message: LITERAL_TEXT_IN_CONDITION_MESSAGE,
+        range: mapRange(token.range),
+        severity: DiagnosticSeverity.Error,
+        code: LITERAL_TEXT_IN_CONDITION_CODE
+      });
+    }
+  } catch {
+    // Ignore parse errors - they'll be caught by schema validation or workflow-parser
+  }
+}
+
+/**
+ * Validates format() function calls in an expression token.
+ */
+function validateExpressionFormatCalls(diagnostics: Diagnostic[], token: BasicExpressionToken): void {
+  const allowedContext = token.definitionInfo?.allowedContext || [];
+  const {namedContexts, functions} = splitAllowedContext(allowedContext);
+
+  try {
+    const l = new Lexer(token.expression);
+    const lr = l.lex();
+    const p = new Parser(lr.tokens, namedContexts, functions);
+    const expr = p.parse();
+
+    validateFormatCallsAndAddDiagnostics(diagnostics, expr, token.range);
+  } catch {
+    // Ignore parse errors - they'll be caught by schema validation
+  }
+}
+
+/**
+ * Helper to validate format() function calls and add diagnostics.
+ */
+function validateFormatCallsAndAddDiagnostics(
+  diagnostics: Diagnostic[],
+  expr: Expr,
+  range: TokenRange | undefined
+): void {
+  const formatErrors = validateFormatCalls(expr);
+  for (const formatError of formatErrors) {
+    if (formatError.type === "invalid-syntax") {
+      diagnostics.push({
+        message: `Invalid format string: ${formatError.message}`,
+        range: mapRange(range),
+        severity: DiagnosticSeverity.Error,
+        code: "invalid-format-string"
+      });
+    } else if (formatError.type === "arg-count-mismatch") {
+      diagnostics.push({
+        message: `Format string references argument {${formatError.expected - 1}} but only ${
+          formatError.provided
+        } argument(s) provided`,
+        range: mapRange(range),
+        severity: DiagnosticSeverity.Error,
+        code: "format-arg-count-mismatch"
+      });
+    }
+  }
+}
+
 /**
  * Find the steps sequence token from the raw action template.
  * Traverses the token tree looking for the "composite-steps" definition.

languageservice/src/validate.expressions-literal-text.test.ts

@@ -160,6 +160,21 @@ jobs:
         })
       );
     });
+
+    it("errors on unknown context in plain string if condition", async () => {
+      const input = `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - if: foo == bar
+        run: echo hi
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+
+      expect(result.some(d => d.message.includes("Unrecognized named-value"))).toBe(true);
+    });
   });
 
   describe("snapshot-if", () => {

languageservice/src/validate.expressions.test.ts

@@ -432,6 +432,24 @@ jobs:
       expect(result).toEqual([]);
     });
 
+    it("job.workflow_* fields", async () => {
+      const input = `
+on: push
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo \${{ job.workflow_ref }}
+      - run: echo \${{ job.workflow_sha }}
+      - run: echo \${{ job.workflow_repository }}
+      - run: echo \${{ job.workflow_file_path }}
+`;
+      const result = await validate(createDocument("wf.yaml", input));
+
+      expect(result).toEqual([]);
+    });
+
     it("job.services.<service_id>", async () => {
       const input = `
 on: push

languageservice/src/validate.service-container-command.test.ts

@@ -0,0 +1,102 @@
+import {registerLogger} from "./log.js";
+import {createDocument} from "./test-utils/document.js";
+import {TestLogger} from "./test-utils/logger.js";
+import {clearCache} from "./utils/workflow-cache.js";
+import {validate} from "./validate.js";
+
+registerLogger(new TestLogger());
+
+beforeEach(() => {
+  clearCache();
+});
+
+describe("service container command/entrypoint", () => {
+  it("allows command in service container", async () => {
+    const input = `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    services:
+      redis:
+        image: redis
+        command: --port 6380
+    steps:
+      - run: echo hi
+`;
+    const result = await validate(createDocument("wf.yaml", input));
+    const commandErrors = result.filter(d => d.message.includes("command"));
+    expect(commandErrors).toEqual([]);
+  });
+
+  it("allows entrypoint in service container", async () => {
+    const input = `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    services:
+      redis:
+        image: redis
+        entrypoint: /usr/local/bin/redis-server
+    steps:
+      - run: echo hi
+`;
+    const result = await validate(createDocument("wf.yaml", input));
+    const entrypointErrors = result.filter(d => d.message.includes("entrypoint"));
+    expect(entrypointErrors).toEqual([]);
+  });
+
+  it("allows both command and entrypoint in service container", async () => {
+    const input = `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    services:
+      redis:
+        image: redis
+        entrypoint: /usr/local/bin/redis-server
+        command: --port 6380
+    steps:
+      - run: echo hi
+`;
+    const result = await validate(createDocument("wf.yaml", input));
+    const relevantErrors = result.filter(d => d.message.includes("command") || d.message.includes("entrypoint"));
+    expect(relevantErrors).toEqual([]);
+  });
+
+  it("rejects command in job container", async () => {
+    const input = `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container:
+      image: node:20
+      command: node
+    steps:
+      - run: echo hi
+`;
+    const result = await validate(createDocument("wf.yaml", input));
+    const commandErrors = result.filter(d => d.message.includes("command"));
+    expect(commandErrors.length).toBeGreaterThan(0);
+  });
+
+  it("rejects entrypoint in job container", async () => {
+    const input = `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container:
+      image: node:20
+      entrypoint: /bin/bash
+    steps:
+      - run: echo hi
+`;
+    const result = await validate(createDocument("wf.yaml", input));
+    const entrypointErrors = result.filter(d => d.message.includes("entrypoint"));
+    expect(entrypointErrors.length).toBeGreaterThan(0);
+  });
+});

languageservice/src/validate.test.ts

@@ -368,6 +368,24 @@ jobs:
     });
   });
 
+  describe("environment deployment", () => {
+    it("allows deployment boolean under environment mapping", async () => {
+      const workflow = `
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    environment:
+      name: prod
+      deployment: false
+    steps:
+    - run: echo
+`;
+      const result = await validate(createDocument("wf.yaml", workflow));
+      expect(result).toEqual([]);
+    });
+  });
+
   describe("workflow_dispatch", () => {
     it("allows empty string in choice options", async () => {
       const result = await validate(

languageservice/src/validate.ts

@@ -1,5 +1,5 @@
-import {FeatureFlags, Lexer, Parser, data} from "@actions/expressions";
-import {Expr, FunctionCall, Literal, Logical} from "@actions/expressions/ast";
+import {FeatureFlags, Lexer, Parser} from "@actions/expressions";
+import {Expr} from "@actions/expressions/ast";
 import {TemplateParseResult, 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";
@@ -24,6 +24,8 @@ import {error} from "./log.js";
 import {isActionDocument} from "./utils/document-type.js";
 import {findToken} from "./utils/find-token.js";
 import {mapRange} from "./utils/range.js";
+import {hasFormatWithLiteralText} from "./utils/validate-if.js";
+import {validateStepUsesFormat, warnIfShortSha} from "./utils/validate-uses.js";
 import {getOrConvertWorkflowTemplate, getOrParseWorkflow} from "./utils/workflow-cache.js";
 import {validateActionReference} from "./validate-action-reference.js";
 import {validateAction} from "./validate-action.js";
@@ -82,7 +84,8 @@ async function validateWorkflow(textDocument: TextDocument, config?: ValidationC
       // Errors will be updated in the context. Attempt to do the conversion anyway in order to give the user more information
       const template = await getOrConvertWorkflowTemplate(result.context, result.value, textDocument.uri, config, {
         fetchReusableWorkflowDepth: config?.fileProvider ? 1 : 0,
-        errorPolicy: ErrorPolicy.TryConversion
+        errorPolicy: ErrorPolicy.TryConversion,
+        featureFlags: config?.featureFlags
       });
 
       // Validate expressions and value providers
@@ -285,116 +288,6 @@ function validateCronExpression(diagnostics: Diagnostic[], token: StringToken):
   }
 }
 
-// Matches a short SHA (7-8 hex characters) that looks like it should be a full SHA
-const SHORT_SHA_PATTERN = /^[0-9a-f]{7,8}$/i;
-const SHORT_SHA_DOCS_URL =
-  "https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-third-party-actions";
-
-/**
- * Checks if a ref looks like a short SHA and adds a warning if so.
- * Returns true if a warning was added.
- */
-function warnIfShortSha(diagnostics: Diagnostic[], token: StringToken, ref: string): boolean {
-  if (SHORT_SHA_PATTERN.test(ref)) {
-    diagnostics.push({
-      message: `The provided ref '${ref}' may be a shortened commit SHA. If so, please use the full 40-character commit SHA instead, as short SHAs are not supported.`,
-      severity: DiagnosticSeverity.Warning,
-      range: mapRange(token.range),
-      code: "short-sha-ref",
-      codeDescription: {
-        href: SHORT_SHA_DOCS_URL
-      }
-    });
-    return true;
-  }
-  return false;
-}
-
-/**
- * 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;
-  }
-
-  // Warn if ref looks like a short SHA
-  warnIfShortSha(diagnostics, token, gitRef);
-}
-
-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).
  *
@@ -639,64 +532,6 @@ function getProviderContext(
   return getWorkflowContext(documentUri, template, path);
 }
 
-/**
- * Checks if a format function contains literal text in its format string.
- * This indicates user confusion about how expressions work.
- *
- * Example: format('push == {0}', github.event_name)
- * The literal text "push == " will always evaluate to truthy.
- *
- * @param expr The expression to check
- * @returns true if the expression is a format() call with literal text
- */
-function hasFormatWithLiteralText(expr: Expr): boolean {
-  // If this is a logical AND expression (from ensureStatusFunction wrapping)
-  // check the right side for the format call
-  if (expr instanceof Logical && expr.operator.lexeme === "&&" && expr.args.length === 2) {
-    return hasFormatWithLiteralText(expr.args[1]);
-  }
-
-  if (!(expr instanceof FunctionCall)) {
-    return false;
-  }
-
-  // Check if this is a format function
-  if (expr.functionName.lexeme.toLowerCase() !== "format") {
-    return false;
-  }
-
-  // Check if the first argument is a string literal
-  if (expr.args.length < 1) {
-    return false;
-  }
-
-  const firstArg = expr.args[0];
-  if (!(firstArg instanceof Literal) || firstArg.literal.kind !== data.Kind.String) {
-    return false;
-  }
-
-  // Get the format string and trim whitespace
-  const formatString = firstArg.literal.coerceString();
-  const trimmed = formatString.trim();
-
-  // Check if there's literal text (non-replacement tokens) after trimming
-  let inToken = false;
-  for (let i = 0; i < trimmed.length; i++) {
-    if (!inToken && trimmed[i] === "{") {
-      inToken = true;
-    } else if (inToken && trimmed[i] === "}") {
-      inToken = false;
-    } else if (inToken && trimmed[i] >= "0" && trimmed[i] <= "9") {
-      // OK - this is a replacement token like {0}, {1}, etc.
-    } else {
-      // Found literal text
-      return true;
-    }
-  }
-
-  return false;
-}
-
 async function validateExpression(
   diagnostics: Diagnostic[],
   token: BasicExpressionToken,

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

@@ -295,7 +295,7 @@ jobs:
 `;
       const result = await validate(createDocument("wf.yaml", input));
       expect(result).toContainEqual({
-        message: "`uses' value in action cannot be blank",
+        message: "'uses' value in action cannot be blank",
         severity: DiagnosticSeverity.Error,
         range: {
           start: {line: 5, character: 12},

languageservice/src/value-providers/default.ts

@@ -4,19 +4,36 @@ import {reusableJobInputs} from "./reusable-job-inputs.js";
 import {reusableJobSecrets} from "./reusable-job-secrets.js";
 import {stringsToValues} from "./strings-to-values.js";
 
+// Refer to: https://github.com/actions/runner-images?tab=readme-ov-file#available-images
 export const DEFAULT_RUNNER_LABELS = [
-  "ubuntu-latest",
-  "ubuntu-24.04",
-  "ubuntu-22.04",
-  "ubuntu-20.04",
-  "ubuntu-slim",
-  "windows-latest",
-  "windows-2022",
-  "windows-2019",
-  "macos-latest",
-  "macos-15",
+  "codespaces-prebuild",
+  "macos-13",
+  "macos-13-large",
+  "macos-13-xlarge",
   "macos-14",
-  "self-hosted"
+  "macos-14-large",
+  "macos-14-xlarge",
+  "macos-15",
+  "macos-15-intel",
+  "macos-15-large",
+  "macos-15-xlarge",
+  "macos-26",
+  "macos-26-large",
+  "macos-26-xlarge",
+  "macos-latest",
+  "macos-latest-large",
+  "macos-latest-xlarge",
+  "self-hosted",
+  "ubuntu-22.04",
+  "ubuntu-22.04-arm",
+  "ubuntu-24.04",
+  "ubuntu-24.04-arm",
+  "ubuntu-latest",
+  "ubuntu-slim",
+  "windows-2022",
+  "windows-2025",
+  "windows-2025-vs2026",
+  "windows-latest"
 ];
 
 const runsOnValueProvider = {

lerna.json

@@ -6,5 +6,5 @@
     "languageservice",
     "languageserver"
   ],
-  "version": "0.3.38"
+  "version": "0.4.0"
 }

package.json

@@ -9,10 +9,7 @@
     "./languageserver"
   ],
   "devDependencies": {
-    "lerna": "^8.2.2",
+    "lerna": "^9.0.0",
     "typescript": "5.8.3"
-  },
-  "overrides": {
-    "typescript": "$typescript"
   }
 }

workflow-parser/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@actions/workflow-parser",
-  "version": "0.3.38",
+  "version": "0.4.0",
   "license": "MIT",
   "type": "module",
   "source": "./src/index.ts",
@@ -48,12 +48,12 @@
     "watch": "tsc --build tsconfig.build.json --watch"
   },
   "dependencies": {
-    "@actions/expressions": "^0.3.38",
+    "@actions/expressions": "^0.4.0",
     "cronstrue": "^2.21.0",
     "yaml": "^2.0.0-8"
   },
   "engines": {
-    "node": ">= 18"
+    "node": ">= 20"
   },
   "files": [
     "dist/**/*"
@@ -69,6 +69,6 @@
     "prettier": "^2.8.3",
     "rimraf": "^3.0.2",
     "ts-jest": "^29.0.3",
-    "typescript": "^4.8.4"
+    "typescript": "^5.8.3"
   }
 }

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

@@ -137,6 +137,24 @@
       ],
       "string": {}
     },
+    "runs-if": {
+      "description": "Condition to control when this action's pre or post script runs.",
+      "context": [
+        "runner",
+        "github",
+        "job",
+        "strategy",
+        "matrix",
+        "env",
+        "inputs",
+        "always(0,0)",
+        "success(0,0)",
+        "failure(0,0)",
+        "cancelled(0,0)",
+        "hashFiles(1,255)"
+      ],
+      "string": {}
+    },
     "runs": {
       "one-of": [
         "container-runs",
@@ -242,7 +260,7 @@
             "description": "Allows you to run a script before the entrypoint action begins.\n\n[Documentation](https://docs.github.com/actions/creating-actions/metadata-syntax-for-github-actions#runspre-entrypoint)"
           },
           "pre-if": {
-            "type": "non-empty-string",
+            "type": "runs-if",
             "description": "Allows you to define conditions for the pre: action execution. The pre: action will only run if the conditions in pre-if are met. If not set, then pre-if defaults to always().\n\n[Documentation](https://docs.github.com/actions/creating-actions/metadata-syntax-for-github-actions#runspre-if)"
           },
           "post-entrypoint": {
@@ -250,7 +268,7 @@
             "description": "Allows you to run a cleanup script once the runs.entrypoint action has completed.\n\n[Documentation](https://docs.github.com/actions/creating-actions/metadata-syntax-for-github-actions#runspost-entrypoint)"
           },
           "post-if": {
-            "type": "non-empty-string",
+            "type": "runs-if",
             "description": "Allows you to define conditions for the post: action execution. The post: action will only run if the conditions in post-if are met. If not set, then post-if defaults to always().\n\n[Documentation](https://docs.github.com/actions/creating-actions/metadata-syntax-for-github-actions#runspost-if)"
           }
         }
@@ -275,7 +293,7 @@
             "description": "Allows you to run a script at the start of a job, before the main: action begins. You can use pre: to run prerequisite setup scripts.\n\n[Documentation](https://docs.github.com/actions/creating-actions/metadata-syntax-for-github-actions#runspre)"
           },
           "pre-if": {
-            "type": "non-empty-string",
+            "type": "runs-if",
             "description": "Allows you to define conditions for the pre: action execution. The pre: action will only run if the conditions in pre-if are met. If not set, then pre-if defaults to always().\n\n[Documentation](https://docs.github.com/actions/creating-actions/metadata-syntax-for-github-actions#runspre-if)"
           },
           "post": {
@@ -283,7 +301,7 @@
             "description": "Allows you to run a script at the end of a job, once the main: action has completed. You can use post: to run cleanup scripts.\n\n[Documentation](https://docs.github.com/actions/creating-actions/metadata-syntax-for-github-actions#runspost)"
           },
           "post-if": {
-            "type": "non-empty-string",
+            "type": "runs-if",
             "description": "Allows you to define conditions for the post: action execution. The post: action will only run if the conditions in post-if are met. If not set, then post-if defaults to always().\n\n[Documentation](https://docs.github.com/actions/creating-actions/metadata-syntax-for-github-actions#runspost-if)"
           }
         }

workflow-parser/src/actions/action-parser.test.ts

@@ -317,4 +317,53 @@ runs:
       }
     }
   });
+
+  it("reports error for invalid context in pre-if", () => {
+    const content = `
+name: Node Action
+description: A node action
+runs:
+  using: node20
+  main: dist/index.js
+  pre: dist/setup.js
+  pre-if: foo == bar`;
+
+    const result = parseAction({name: "action.yml", content}, nullTrace);
+    expect(result.value).toBeDefined();
+    if (!result.value) return;
+
+    // Should have no errors before conversion
+    expect(result.context.errors.count).toBe(0);
+
+    // Convert the template - this should add the validation error
+    convertActionTemplate(result.context, result.value);
+
+    // Should have an error now about invalid context
+    expect(result.context.errors.count).toBeGreaterThan(0);
+    const errors = result.context.errors.getErrors();
+    expect(errors.some(e => e.rawMessage.includes("foo"))).toBe(true);
+  });
+
+  it("accepts valid context in pre-if", () => {
+    const content = `
+name: Node Action
+description: A node action
+runs:
+  using: node20
+  main: dist/index.js
+  pre: dist/setup.js
+  pre-if: runner.os == 'Linux'`;
+
+    const result = parseAction({name: "action.yml", content}, nullTrace);
+    expect(result.value).toBeDefined();
+    if (!result.value) return;
+
+    const template = convertActionTemplate(result.context, result.value);
+
+    // Should have no errors
+    expect(result.context.errors.count).toBe(0);
+    if (template.runs.using === "node20") {
+      expect(template.runs.preIf).toBe("runner.os == 'Linux'");
+    }
+  });
 });

workflow-parser/src/actions/action-template.ts

@@ -9,7 +9,7 @@ import {TemplateContext} from "../templates/template-context.js";
 import {isBoolean, isMapping, isScalar, isSequence, isString} from "../templates/tokens/type-guards.js";
 import {ErrorPolicy} from "../model/convert.js";
 import {Step} from "../model/workflow-template.js";
-import {convertToIfCondition} from "../model/converter/if-condition.js";
+import {convertToIfCondition, validateRunsIfCondition} from "../model/converter/if-condition.js";
 
 /**
  * Represents a parsed and converted action.yml file
@@ -310,7 +310,7 @@ function convertRuns(context: TemplateContext, token: TemplateToken): ActionRuns
 
       case "pre-if":
         if (isString(item.value)) {
-          preIf = item.value.value;
+          preIf = validateRunsIfCondition(context, item.value, item.value.value);
         }
         break;
 
@@ -322,7 +322,7 @@ function convertRuns(context: TemplateContext, token: TemplateToken): ActionRuns
 
       case "post-if":
         if (isString(item.value)) {
-          postIf = item.value.value;
+          postIf = validateRunsIfCondition(context, item.value, item.value.value);
         }
         break;
 

workflow-parser/src/model/convert.test.ts

@@ -578,4 +578,86 @@ jobs:
       }
     });
   });
+
+  describe("schedule timezone", () => {
+    it("allows timezone in schedule", async () => {
+      const result = parseWorkflow(
+        {
+          name: "wf.yaml",
+          content: `on:
+  schedule:
+    - cron: '0 0 * * *'
+      timezone: America/New_York
+jobs:
+  build:
+    runs-on: ubuntu-latest`
+        },
+        nullTrace
+      );
+
+      const template = await convertWorkflowTemplate(result.context, result.value!, undefined, {
+        errorPolicy: ErrorPolicy.TryConversion
+      });
+
+      expect(result.context.errors.getErrors()).toHaveLength(0);
+      expect(template.events?.schedule).toHaveLength(1);
+      expect(template.events?.schedule?.[0]).toEqual({
+        cron: "0 0 * * *",
+        timezone: "America/New_York"
+      });
+    });
+
+    it("reports error when cron is missing from schedule entry", async () => {
+      const result = parseWorkflow(
+        {
+          name: "wf.yaml",
+          content: `on:
+  schedule:
+    - timezone: America/New_York
+jobs:
+  build:
+    runs-on: ubuntu-latest`
+        },
+        nullTrace
+      );
+
+      const template = await convertWorkflowTemplate(result.context, result.value!, undefined, {
+        errorPolicy: ErrorPolicy.TryConversion
+      });
+
+      // Both schema validation and converter report the missing cron
+      expect(result.context.errors.getErrors().length).toBeGreaterThanOrEqual(1);
+      const errorMessages = result.context.errors
+        .getErrors()
+        .map(e => e.message)
+        .join(", ");
+      expect(errorMessages).toMatch(/Required property is missing: cron|Missing required key 'cron'/);
+      expect(template.events?.schedule).toHaveLength(0);
+    });
+
+    it("converts schedule without timezone", async () => {
+      const result = parseWorkflow(
+        {
+          name: "wf.yaml",
+          content: `on:
+  schedule:
+    - cron: '0 0 * * *'
+jobs:
+  build:
+    runs-on: ubuntu-latest`
+        },
+        nullTrace
+      );
+
+      const template = await convertWorkflowTemplate(result.context, result.value!, undefined, {
+        errorPolicy: ErrorPolicy.TryConversion
+      });
+
+      expect(result.context.errors.getErrors()).toHaveLength(0);
+      expect(template.events?.schedule).toHaveLength(1);
+      expect(template.events?.schedule?.[0]).toEqual({
+        cron: "0 0 * * *"
+      });
+    });
+  });
 });

workflow-parser/src/model/convert.ts

@@ -1,3 +1,4 @@
+import {FeatureFlags} from "@actions/expressions/features";
 import {TemplateContext} from "../templates/template-context.js";
 import {TemplateToken, TemplateTokenError} from "../templates/tokens/template-token.js";
 import {FileProvider} from "../workflows/file-provider.js";
@@ -37,12 +38,18 @@ export type WorkflowTemplateConverterOptions = {
    * By default, conversion will be skipped if there are errors in the {@link TemplateContext}.
    */
   errorPolicy?: ErrorPolicy;
+
+  /**
+   * Feature flags for experimental features.
+   */
+  featureFlags?: FeatureFlags;
 };
 
 const defaultOptions: Required<WorkflowTemplateConverterOptions> = {
   maxReusableWorkflowDepth: 4,
   fetchReusableWorkflowDepth: 0,
-  errorPolicy: ErrorPolicy.ReturnErrorsOnly
+  errorPolicy: ErrorPolicy.ReturnErrorsOnly,
+  featureFlags: new FeatureFlags()
 };
 
 export async function convertWorkflowTemplate(
@@ -54,6 +61,8 @@ export async function convertWorkflowTemplate(
   const result = {} as WorkflowTemplate;
   const opts = getOptionsWithDefaults(options);
 
+  context.state.featureFlags = opts.featureFlags;
+
   if (context.errors.getErrors().length > 0 && opts.errorPolicy === ErrorPolicy.ReturnErrorsOnly) {
     result.errors = context.errors.getErrors().map(x => ({
       Message: x.message
@@ -142,6 +151,7 @@ function getOptionsWithDefaults(options: WorkflowTemplateConverterOptions): Requ
       options.fetchReusableWorkflowDepth !== undefined
         ? options.fetchReusableWorkflowDepth
         : defaultOptions.fetchReusableWorkflowDepth,
-    errorPolicy: options.errorPolicy !== undefined ? options.errorPolicy : defaultOptions.errorPolicy
+    errorPolicy: options.errorPolicy !== undefined ? options.errorPolicy : defaultOptions.errorPolicy,
+    featureFlags: options.featureFlags ?? defaultOptions.featureFlags
   };
 }

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

@@ -70,13 +70,87 @@ export function convertToJobContainer(context: TemplateContext, container: Templ
   }
 }
 
+export function convertToServiceContainer(context: TemplateContext, container: TemplateToken): Container | undefined {
+  let image: StringToken | undefined;
+  let env: MappingToken | undefined;
+  let ports: SequenceToken | undefined;
+  let volumes: SequenceToken | undefined;
+  let options: StringToken | undefined;
+  let entrypoint: StringToken | undefined;
+  let command: StringToken | undefined;
+
+  // Skip validation for expressions for now to match
+  // behavior of the other parsers
+  for (const [, token] of TemplateToken.traverse(container)) {
+    if (token.isExpression) {
+      return;
+    }
+  }
+
+  if (isString(container)) {
+    image = container.assertString("container item");
+    return {image: image};
+  }
+
+  const mapping = container.assertMapping("container item");
+  if (mapping)
+    for (const item of mapping) {
+      const key = item.key.assertString("container item key");
+      const value = item.value;
+
+      switch (key.value) {
+        case "image":
+          image = value.assertString("container image");
+          break;
+        case "credentials":
+          convertToJobCredentials(context, value);
+          break;
+        case "env":
+          env = value.assertMapping("container env");
+          for (const envItem of env) {
+            envItem.key.assertString("container env value");
+          }
+          break;
+        case "ports":
+          ports = value.assertSequence("container ports");
+          for (const port of ports) {
+            port.assertString("container port");
+          }
+          break;
+        case "volumes":
+          volumes = value.assertSequence("container volumes");
+          for (const volume of volumes) {
+            volume.assertString("container volume");
+          }
+          break;
+        case "options":
+          options = value.assertString("container options");
+          break;
+        case "entrypoint":
+          entrypoint = value.assertString("container entrypoint");
+          break;
+        case "command":
+          command = value.assertString("container command");
+          break;
+        default:
+          context.error(key, `Unexpected container item key: ${key.value}`);
+      }
+    }
+
+  if (!image) {
+    context.error(container, "Container image cannot be empty");
+  } else {
+    return {image, env, ports, volumes, options, entrypoint, command};
+  }
+}
+
 export function convertToJobServices(context: TemplateContext, services: TemplateToken): Container[] | undefined {
   const serviceList: Container[] = [];
 
   const mapping = services.assertMapping("services");
   for (const service of mapping) {
     service.key.assertString("service key");
-    const container = convertToJobContainer(context, service.value);
+    const container = convertToServiceContainer(context, service.value);
     if (container) {
       serviceList.push(container);
     }

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

@@ -149,23 +149,34 @@ function convertFilter<T extends TypesFilterConfig & WorkflowFilterConfig & Vers
 
 function convertSchedule(context: TemplateContext, token: SequenceToken): ScheduleConfig[] | undefined {
   const result = [] as ScheduleConfig[];
+
   for (const item of token) {
     const mappingToken = item.assertMapping(`event schedule`);
-    if (mappingToken.count == 1) {
-      const schedule = mappingToken.get(0);
-      const scheduleKey = schedule.key.assertString(`schedule key`);
-      if (scheduleKey.value == "cron") {
-        const cron = schedule.value.assertString(`schedule cron`);
-        // Validate the cron string
+    const config: ScheduleConfig = {cron: ""};
+    let valid = true;
+
+    for (const entry of mappingToken) {
+      const key = entry.key.assertString(`schedule key`);
+
+      if (key.value === "cron") {
+        const cron = entry.value.assertString(`schedule cron`);
         if (!isValidCron(cron.value)) {
           context.error(cron, "Invalid cron expression. Expected format: '* * * * *' (minute hour day month weekday)");
         }
-        result.push({cron: cron.value});
+        config.cron = cron.value;
+      } else if (key.value === "timezone") {
+        const timezone = entry.value.assertString(`schedule timezone`);
+        config.timezone = timezone.value;
       } else {
-        context.error(scheduleKey, `Invalid schedule key`);
+        context.error(key, `Invalid schedule key`);
+        valid = false;
       }
-    } else {
-      context.error(mappingToken, "Invalid format for 'schedule'");
+    }
+
+    if (valid && config.cron) {
+      result.push(config);
+    } else if (valid && !config.cron) {
+      context.error(mappingToken, "Missing required key 'cron' in schedule entry");
     }
   }
 

workflow-parser/src/model/converter/if-condition.ts

@@ -136,3 +136,32 @@ function walkTreeToFindStatusFunctionCalls(tree: Expr | undefined): boolean {
 
   return false;
 }
+
+/**
+ * Validates a pre-if or post-if condition string.
+ * Unlike step if conditions, pre-if and post-if are evaluated as-is by the runner
+ * (they default to always() only when the field is missing entirely).
+ * This function validates the expression and reports errors through the context.
+ *
+ * @param context The template context for error reporting
+ * @param token The token containing the condition
+ * @param condition The condition string to validate
+ * @returns The validated condition string, or undefined on error
+ */
+export function validateRunsIfCondition(
+  context: TemplateContext,
+  token: TemplateToken,
+  condition: string
+): string | undefined {
+  const allowedContext = token.definitionInfo?.allowedContext || [];
+
+  // Validate the expression directly - no wrapping needed for pre-if/post-if
+  try {
+    ExpressionToken.validateExpression(condition, allowedContext);
+  } catch (err) {
+    context.error(token, err as Error);
+    return undefined;
+  }
+
+  return condition;
+}

workflow-parser/src/model/converter/job/environment.ts

@@ -34,6 +34,14 @@ export function convertToActionsEnvironmentRef(
       case "url":
         result.url = property.value;
         break;
+
+      case "deployment": {
+        const deploymentValue = property.value.assertBoolean("job environment deployment");
+        if (deploymentValue.value === false) {
+          result.skipDeployment = true;
+        }
+        break;
+      }
     }
   }
 

workflow-parser/src/model/workflow-template.ts

@@ -26,6 +26,7 @@ export type ConcurrencySetting = {
 export type ActionsEnvironmentReference = {
   name?: TemplateToken;
   url?: TemplateToken;
+  skipDeployment?: boolean;
 };
 
 export type WorkflowJob = Job | ReusableWorkflowJob;
@@ -74,6 +75,8 @@ export type Container = {
   ports?: SequenceToken;
   volumes?: SequenceToken;
   options?: StringToken;
+  entrypoint?: StringToken;
+  command?: StringToken;
 };
 
 export type Credential = {
@@ -196,6 +199,7 @@ export type SecretConfig = {
 
 export type ScheduleConfig = {
   cron: string;
+  timezone?: string;
 };
 
 export type WorkflowFilterConfig = {

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

@@ -1602,6 +1602,10 @@
             "type": "permission-level-any",
             "description": "Repository contents, commits, branches, downloads, releases, and merges."
           },
+          "copilot-requests": {
+            "type": "permission-level-write-or-no-access",
+            "description": "GitHub Copilot requests."
+          },
           "deployments": {
             "type": "permission-level-any",
             "description": "Deployments and deployment statuses."
@@ -2075,6 +2079,10 @@
           "url": {
             "type": "string-runner-context-no-secrets",
             "description": "The environment URL, which maps to `environment_url` in the deployments API."
+          },
+          "deployment": {
+            "type": "boolean",
+            "description": "Whether to create a deployment record for this environment. Defaults to true."
           }
         }
       }
@@ -2172,7 +2180,7 @@
       }
     },
     "step-uses": {
-      "description": "Selects an action to run as part of a step in your job. An action is a reusable unit of code. You can use an action defined in the same repository as the workflow, a public repository, or in a published Docker container image.",
+      "description": "Selects an action to run as part of a step in your job. An action is a reusable unit of code. You can use an action defined in the same repository as the workflow, a public repository, a [private repository with access enabled](https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/enabling-features-for-your-repository/managing-github-actions-settings-for-a-repository#allowing-access-to-components-in-a-private-repository), or in a published Docker container image.",
       "string": {
         "require-non-empty": true
       }
@@ -2349,7 +2357,7 @@
             "description": "Use `jobs.<job_id>.container.image` to define the Docker image to use as the container to run the action. The value can be the Docker Hub image or a registry name."
           },
           "options": {
-            "type": "non-empty-string",
+            "type": "string",
             "description": "Use `jobs.<job_id>.container.options` to configure additional Docker container resource options."
           },
           "env": "container-env",
@@ -2391,7 +2399,7 @@
       ],
       "one-of": [
         "non-empty-string",
-        "container-mapping"
+        "service-container-mapping"
       ]
     },
     "container-registry-credentials": {
@@ -2620,14 +2628,57 @@
     "cron-mapping": {
       "mapping": {
         "properties": {
-          "cron": "cron-pattern"
+          "cron": {
+            "type": "cron-pattern",
+            "required": true
+          },
+          "timezone": "timezone-string"
         }
       }
     },
     "cron-pattern": {
+      "description": "A cron expression that represents a schedule. A scheduled workflow will run at most once every 5 minutes.",
       "string": {
         "require-non-empty": true
       }
+    },
+    "timezone-string": {
+      "description": "A string that represents the time zone a scheduled workflow will run relative to in IANA format (e.g. 'America/New_York' or 'Europe/London'). If omitted, the workflow will run relative to midnight UTC.",
+      "string": {
+        "require-non-empty": true
+      }
+    },
+    "service-container-mapping": {
+      "mapping": {
+        "properties": {
+          "image": {
+            "type": "non-empty-string",
+            "description": "The Docker image to use as the container. The value can be the Docker Hub image or a registry name."
+          },
+          "options": {
+            "type": "string",
+            "description": "Additional Docker container resource options."
+          },
+          "env": "container-env",
+          "ports": {
+            "type": "sequence-of-non-empty-string",
+            "description": "An array of ports to expose on the container."
+          },
+          "volumes": {
+            "type": "sequence-of-non-empty-string",
+            "description": "An array of volumes for the container to use. You can use volumes to share data between services or other steps in a job. You can specify named Docker volumes, anonymous Docker volumes, or bind mounts on the host."
+          },
+          "credentials": "container-registry-credentials",
+          "entrypoint": {
+            "type": "string",
+            "description": "Override the default ENTRYPOINT in the service container image."
+          },
+          "command": {
+            "type": "string",
+            "description": "Override the default CMD in the service container image."
+          }
+        }
+      }
     }
   }
 }

workflow-parser/testdata/reader/job-environment-deployment.yml

@@ -0,0 +1,91 @@
+include-source: false # Drop file/line/col from output
+skip:
+  - C#
+---
+on: push
+jobs:
+  build:
+    environment:
+      name: production
+      deployment: false
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo hi
+  build2:
+    environment:
+      name: staging
+      deployment: true
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo hi
+---
+{
+  "jobs": [
+    {
+      "type": "job",
+      "id": "build",
+      "name": "build",
+      "if": {
+        "type": 3,
+        "expr": "success()"
+      },
+      "environment": {
+        "type": 2,
+        "map": [
+          {
+            "Key": "name",
+            "Value": "production"
+          },
+          {
+            "Key": "deployment",
+            "Value": false
+          }
+        ]
+      },
+      "runs-on": "ubuntu-latest",
+      "steps": [
+        {
+          "id": "__run",
+          "if": {
+            "type": 3,
+            "expr": "success()"
+          },
+          "run": "echo hi"
+        }
+      ]
+    },
+    {
+      "type": "job",
+      "id": "build2",
+      "name": "build2",
+      "if": {
+        "type": 3,
+        "expr": "success()"
+      },
+      "environment": {
+        "type": 2,
+        "map": [
+          {
+            "Key": "name",
+            "Value": "staging"
+          },
+          {
+            "Key": "deployment",
+            "Value": true
+          }
+        ]
+      },
+      "runs-on": "ubuntu-latest",
+      "steps": [
+        {
+          "id": "__run",
+          "if": {
+            "type": 3,
+            "expr": "success()"
+          },
+          "run": "echo hi"
+        }
+      ]
+    }
+  ]
+}