diff --git a/actions-languageserver/src/connection.ts b/actions-languageserver/src/connection.ts
index be145ce..7747ded 100644
--- a/actions-languageserver/src/connection.ts
+++ b/actions-languageserver/src/connection.ts
@@ -24,9 +24,9 @@ import {getFileProvider} from "./file-provider";
 import {InitializationOptions, RepositoryContext} from "./initializationOptions";
 import {onCompletion} from "./on-completion";
 import {ReadFileRequest, Requests} from "./request";
+import {fetchActionMetadata} from "./utils/action-metadata";
 import {TTLCache} from "./utils/cache";
 import {valueProviders} from "./value-providers";
-import {getActionInputs} from "./value-providers/action-inputs";
 
 export function initConnection(connection: Connection) {
   const documents: TextDocuments<TextDocument> = new TextDocuments(TextDocument);
@@ -102,9 +102,9 @@ export function initConnection(connection: Connection) {
     const config: ValidationConfig = {
       valueProviderConfig: valueProviders(client, repoContext, cache),
       contextProviderConfig: contextProviders(client, repoContext, cache),
-      getActionInputs: async action => {
+      fetchActionMetadata: async action => {
         if (client) {
-          return await getActionInputs(client, cache, action);
+          return await fetchActionMetadata(client, cache, action);
         }
 
         return undefined;
diff --git a/actions-languageserver/src/utils/action-metadata.ts b/actions-languageserver/src/utils/action-metadata.ts
index cf424f5..c23cfae 100644
--- a/actions-languageserver/src/utils/action-metadata.ts
+++ b/actions-languageserver/src/utils/action-metadata.ts
@@ -1,14 +1,9 @@
-import {ActionReference, ActionInputs, ActionOutputs, actionIdentifier} from "@github/actions-languageservice/action";
+import {ActionReference, ActionMetadata, actionIdentifier} from "@github/actions-languageservice/action";
 import {error} from "@github/actions-languageservice/log";
 import {Octokit, RestEndpointMethodTypes} from "@octokit/rest";
 import {parse} from "yaml";
 import {TTLCache} from "./cache";
 
-export type ActionMetadata = {
-  inputs?: ActionInputs;
-  outputs?: ActionOutputs;
-};
-
 export async function fetchActionMetadata(
   client: Octokit,
   cache: TTLCache,
diff --git a/actions-languageservice/src/action.ts b/actions-languageservice/src/action.ts
index 4c35918..b10a166 100644
--- a/actions-languageservice/src/action.ts
+++ b/actions-languageservice/src/action.ts
@@ -1,3 +1,9 @@
+// https://docs.github.com/en/actions/creating-actions/metadata-syntax-for-github-actions
+export type ActionMetadata = {
+  inputs?: ActionInputs;
+  outputs?: ActionOutputs;
+};
+
 // https://docs.github.com/en/actions/creating-actions/metadata-syntax-for-github-actions#inputs
 export type ActionInput = {
   description: string;
diff --git a/actions-languageservice/src/validate-action.ts b/actions-languageservice/src/validate-action.ts
index b5c1931..7e499e4 100644
--- a/actions-languageservice/src/validate-action.ts
+++ b/actions-languageservice/src/validate-action.ts
@@ -14,7 +14,7 @@ export async function validateAction(
   step: Step | undefined,
   config: ValidationConfig | undefined
 ): Promise<void> {
-  if (!isMapping(stepToken) || !step || !isActionStep(step) || !config?.getActionInputs) {
+  if (!isMapping(stepToken) || !step || !isActionStep(step) || !config?.fetchActionMetadata) {
     return;
   }
 
@@ -23,8 +23,8 @@ export async function validateAction(
     return;
   }
 
-  const actionInputs = await config.getActionInputs(action);
-  if (actionInputs === undefined) {
+  const actionMetadata = await config.fetchActionMetadata(action);
+  if (actionMetadata === undefined) {
     diagnostics.push({
       severity: DiagnosticSeverity.Error,
       range: mapRange(step.uses.range),
@@ -50,6 +50,11 @@ export async function validateAction(
     }
   }
 
+  const actionInputs = actionMetadata.inputs;
+  if (actionInputs === undefined) {
+    return;
+  }
+
   for (const [input, inputToken] of stepInputs) {
     if (!actionInputs[input]) {
       diagnostics.push({
diff --git a/actions-languageservice/src/validate.actions.test.ts b/actions-languageservice/src/validate.actions.test.ts
index 0b01bff..fa00c5e 100644
--- a/actions-languageservice/src/validate.actions.test.ts
+++ b/actions-languageservice/src/validate.actions.test.ts
@@ -1,5 +1,5 @@
 import {DiagnosticSeverity} from "vscode-languageserver-types";
-import {ActionInput, ActionReference} from "./action";
+import {ActionMetadata, ActionReference} from "./action";
 import {registerLogger} from "./log";
 import {createDocument} from "./test-utils/document";
 import {TestLogger} from "./test-utils/logger";
@@ -9,53 +9,63 @@ import {ValueProviderKind} from "./value-providers/config";
 registerLogger(new TestLogger());
 
 const validationConfig: ValidationConfig = {
-  getActionInputs: async (ref: ActionReference) => {
-    let inputs: Record<string, ActionInput> | undefined = undefined;
+  fetchActionMetadata: async (ref: ActionReference) => {
+    let metadata: ActionMetadata | undefined = undefined;
     switch (ref.owner + "/" + ref.name + "@" + ref.ref) {
       case "actions/checkout@v3":
-        inputs = {
-          repository: {
-            description: "Repository name with owner",
-            default: "${{ github.repository }}"
+        metadata = {
+          inputs: {
+            repository: {
+              description: "Repository name with owner",
+              default: "${{ github.repository }}"
+            }
           }
         };
         break;
       case "actions/setup-node@v1":
-        inputs = {
-          version: {
-            description: "Deprecated. Use node-version instead. Will not be supported after October 1, 2019",
-            deprecationMessage:
-              "The version property will not be supported after October 1, 2019. Use node-version instead"
+        metadata = {
+          inputs: {
+            version: {
+              description: "Deprecated. Use node-version instead. Will not be supported after October 1, 2019",
+              deprecationMessage:
+                "The version property will not be supported after October 1, 2019. Use node-version instead"
+            }
           }
         };
         break;
       case "actions/deploy-pages@main":
-        inputs = {
-          token: {
-            required: true,
-            description: "token to use",
-            default: "${{ github.token }}"
+        metadata = {
+          inputs: {
+            token: {
+              required: true,
+              description: "token to use",
+              default: "${{ github.token }}"
+            }
           }
         };
         break;
       case "actions/cache@v1":
-        inputs = {
-          path: {
-            description: "A directory to store and save the cache",
-            required: true
-          },
-          key: {
-            description: "An explicit key for restoring and saving the cache",
-            required: true
-          },
-          "restore-keys": {
-            description: "An ordered list of keys to use for restoring the cache if no cache hit occurred for key",
-            required: false
+        metadata = {
+          inputs: {
+            path: {
+              description: "A directory to store and save the cache",
+              required: true
+            },
+            key: {
+              description: "An explicit key for restoring and saving the cache",
+              required: true
+            },
+            "restore-keys": {
+              description: "An ordered list of keys to use for restoring the cache if no cache hit occurred for key",
+              required: false
+            }
           }
         };
         break;
+      case "actions/action-no-input@v1":
+        metadata = {};
     }
-    return inputs;
+    return metadata;
   }
 };
 
@@ -103,6 +113,20 @@ jobs:
     ]);
   });
 
+  it("action does not define inputs", async () => {
+    const input = `
+    on: push
+    jobs:
+      build:
+        runs-on: ubuntu-latest
+        steps:
+        - uses: actions/action-no-input@v1
+    `;
+    const result = await validate(createDocument("wf.yaml", input), validationConfig);
+
+    expect(result).toEqual([]);
+  });
+
   it("invalid input", async () => {
     const input = `
 on: push
diff --git a/actions-languageservice/src/validate.ts b/actions-languageservice/src/validate.ts
index b466642..347300d 100644
--- a/actions-languageservice/src/validate.ts
+++ b/actions-languageservice/src/validate.ts
@@ -17,7 +17,7 @@ import {File} from "@github/actions-workflow-parser/workflows/file";
 import {FileProvider} from "@github/actions-workflow-parser/workflows/file-provider";
 import {TextDocument} from "vscode-languageserver-textdocument";
 import {Diagnostic, DiagnosticSeverity, URI} from "vscode-languageserver-types";
-import {ActionInputs, ActionReference} from "./action";
+import {ActionMetadata, ActionReference} from "./action";
 
 import {ContextProviderConfig} from "./context-providers/config";
 import {getContext, Mode} from "./context-providers/default";
@@ -35,7 +35,7 @@ import {defaultValueProviders} from "./value-providers/default";
 export type ValidationConfig = {
   valueProviderConfig?: ValueProviderConfig;
   contextProviderConfig?: ContextProviderConfig;
-  getActionInputs?(action: ActionReference): Promise<ActionInputs | undefined>;
+  fetchActionMetadata?(action: ActionReference): Promise<ActionMetadata | undefined>;
   fileProvider?: FileProvider;
 };