diff --git a/.github/workflows/pr-checks.yml b/.github/workflows/pr-checks.yml
index 95aab0af9..c2536b90a 100644
--- a/.github/workflows/pr-checks.yml
+++ b/.github/workflows/pr-checks.yml
@@ -55,10 +55,10 @@ jobs:
         working-directory: packages/${{ matrix.package }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
           node-version: '20'
           cache: 'npm'
@@ -70,3 +70,27 @@ jobs:
       - name: Run tests
         run: npm test
 
+  jsdoc-validation:
+    # Fails when public API methods/parameters lack JSDoc. Uses TypeDoc's
+    # built-in notDocumented validation (typedoc.validation.json) - no custom
+    # parsing. Expected to fail until existing gaps are documented or tagged
+    # @internal.
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+
+      - name: Setup Node.js
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Validate JSDoc completeness
+        run: npm run docs:validate
+
diff --git a/package.json b/package.json
index 39a0a1db7..931a11a3f 100644
--- a/package.json
+++ b/package.json
@@ -240,6 +240,7 @@
         "docs:api": "typedoc && npm run docs:post-process && npm run docs:coded-action-app",
         "docs:coded-action-app": "npm run docs --prefix packages/coded-action-app",
         "docs:post-process": "node scripts/docs-post-process.mjs",
+        "docs:validate": "typedoc --options typedoc.validation.json",
         "lint": "oxlint",
         "typecheck": "tsc --noEmit",
         "test": "vitest",
diff --git a/src/core/errors/authentication.ts b/src/core/errors/authentication.ts
index e24b551c2..3a4644c54 100644
--- a/src/core/errors/authentication.ts
+++ b/src/core/errors/authentication.ts
@@ -10,6 +10,7 @@ import { ErrorParams } from './types';
  * - Missing authentication
  */
 export class AuthenticationError extends UiPathError {
+  /** @internal */
   constructor(params: Partial<ErrorParams> = {}) {
     super(ErrorType.AUTHENTICATION, {
       message: params.message || ErrorMessages.AUTHENTICATION_FAILED,
diff --git a/src/core/errors/authorization.ts b/src/core/errors/authorization.ts
index 48c3a3bc3..00d263d28 100644
--- a/src/core/errors/authorization.ts
+++ b/src/core/errors/authorization.ts
@@ -10,6 +10,7 @@ import { ErrorParams } from './types';
  * - Invalid scope
  */
 export class AuthorizationError extends UiPathError {
+  /** @internal */
   constructor(params: Partial<ErrorParams> = {}) {
     super(ErrorType.AUTHORIZATION, {
       message: params.message || ErrorMessages.ACCESS_DENIED,
diff --git a/src/core/errors/guards.ts b/src/core/errors/guards.ts
index 525f4de05..9e3335c63 100644
--- a/src/core/errors/guards.ts
+++ b/src/core/errors/guards.ts
@@ -9,6 +9,9 @@ import { NetworkError } from './network';
 
 /**
  * Type guard to check if an error is a UiPathError
+ *
+ * @param error - The value to check
+ * @returns True if the value is a UiPathError
  */
 export function isUiPathError(error: unknown): error is UiPathError {
   return error instanceof UiPathError;
@@ -16,6 +19,9 @@ export function isUiPathError(error: unknown): error is UiPathError {
 
 /**
  * Type guard to check if an error is an AuthenticationError
+ *
+ * @param error - The value to check
+ * @returns True if the value is an AuthenticationError
  */
 export function isAuthenticationError(error: unknown): error is AuthenticationError {
   return error instanceof AuthenticationError;
@@ -23,6 +29,9 @@ export function isAuthenticationError(error: unknown): error is AuthenticationEr
 
 /**
  * Type guard to check if an error is an AuthorizationError
+ *
+ * @param error - The value to check
+ * @returns True if the value is an AuthorizationError
  */
 export function isAuthorizationError(error: unknown): error is AuthorizationError {
   return error instanceof AuthorizationError;
@@ -30,6 +39,9 @@ export function isAuthorizationError(error: unknown): error is AuthorizationErro
 
 /**
  * Type guard to check if an error is a ValidationError
+ *
+ * @param error - The value to check
+ * @returns True if the value is a ValidationError
  */
 export function isValidationError(error: unknown): error is ValidationError {
   return error instanceof ValidationError;
@@ -37,6 +49,9 @@ export function isValidationError(error: unknown): error is ValidationError {
 
 /**
  * Type guard to check if an error is a NotFoundError
+ *
+ * @param error - The value to check
+ * @returns True if the value is a NotFoundError
  */
 export function isNotFoundError(error: unknown): error is NotFoundError {
   return error instanceof NotFoundError;
@@ -44,6 +59,9 @@ export function isNotFoundError(error: unknown): error is NotFoundError {
 
 /**
  * Type guard to check if an error is a RateLimitError
+ *
+ * @param error - The value to check
+ * @returns True if the value is a RateLimitError
  */
 export function isRateLimitError(error: unknown): error is RateLimitError {
   return error instanceof RateLimitError;
@@ -51,6 +69,9 @@ export function isRateLimitError(error: unknown): error is RateLimitError {
 
 /**
  * Type guard to check if an error is a ServerError
+ *
+ * @param error - The value to check
+ * @returns True if the value is a ServerError
  */
 export function isServerError(error: unknown): error is ServerError {
   return error instanceof ServerError;
@@ -58,6 +79,9 @@ export function isServerError(error: unknown): error is ServerError {
 
 /**
  * Type guard to check if an error is a NetworkError
+ *
+ * @param error - The value to check
+ * @returns True if the value is a NetworkError
  */
 export function isNetworkError(error: unknown): error is NetworkError {
   return error instanceof NetworkError;
@@ -65,6 +89,9 @@ export function isNetworkError(error: unknown): error is NetworkError {
 
 /**
  * Helper to get error details in a safe way
+ *
+ * @param error - The error to extract details from
+ * @returns The error message and, when available, the HTTP status code
  */
 export function getErrorDetails(error: unknown): { message: string; statusCode?: number } {
   if (isUiPathError(error)) {
diff --git a/src/core/errors/network.ts b/src/core/errors/network.ts
index 85f0bf195..0a47b577a 100644
--- a/src/core/errors/network.ts
+++ b/src/core/errors/network.ts
@@ -11,6 +11,7 @@ import { ErrorParams } from './types';
  * - Request aborted
  */
 export class NetworkError extends UiPathError {
+  /** @internal */
   constructor(params: Partial<ErrorParams> = {}) {
     super(ErrorType.NETWORK, {
       message: params.message || ErrorMessages.NETWORK_ERROR,
diff --git a/src/core/errors/not-found.ts b/src/core/errors/not-found.ts
index 54d3aee81..3fd3272ba 100644
--- a/src/core/errors/not-found.ts
+++ b/src/core/errors/not-found.ts
@@ -10,6 +10,7 @@ import { ErrorParams } from './types';
  * - Resource deleted
  */
 export class NotFoundError extends UiPathError {
+  /** @internal */
   constructor(params: Partial<ErrorParams> = {}) {
     super(ErrorType.NOT_FOUND, {
       message: params.message || ErrorMessages.RESOURCE_NOT_FOUND,
diff --git a/src/core/errors/rate-limit.ts b/src/core/errors/rate-limit.ts
index 02c7cec39..2ff87de19 100644
--- a/src/core/errors/rate-limit.ts
+++ b/src/core/errors/rate-limit.ts
@@ -9,6 +9,7 @@ import { ErrorParams } from './types';
  * - API throttling
  */
 export class RateLimitError extends UiPathError {
+  /** @internal */
   constructor(params: Partial<ErrorParams> = {}) {
     super(ErrorType.RATE_LIMIT, {
       message: params.message || ErrorMessages.RATE_LIMIT_EXCEEDED,
diff --git a/src/core/errors/server.ts b/src/core/errors/server.ts
index ba024ab06..5ff1ba70a 100644
--- a/src/core/errors/server.ts
+++ b/src/core/errors/server.ts
@@ -10,6 +10,7 @@ import { ErrorParams } from './types';
  * - Gateway timeout
  */
 export class ServerError extends UiPathError {
+  /** @internal */
   constructor(params: Partial<ErrorParams> = {}) {
     super(ErrorType.SERVER, {
       message: params.message || ErrorMessages.INTERNAL_SERVER_ERROR,
diff --git a/src/core/errors/validation.ts b/src/core/errors/validation.ts
index a668ce793..e9d6eb3fb 100644
--- a/src/core/errors/validation.ts
+++ b/src/core/errors/validation.ts
@@ -10,6 +10,7 @@ import { ErrorParams } from './types';
  * - Invalid data format
  */
 export class ValidationError extends UiPathError {
+  /** @internal */
   constructor(params: Partial<ErrorParams> = {}) {
     super(ErrorType.VALIDATION, {
       message: params.message || ErrorMessages.VALIDATION_FAILED,
diff --git a/src/core/telemetry/index.ts b/src/core/telemetry/index.ts
index b1a4ae78b..ccbec7c66 100644
--- a/src/core/telemetry/index.ts
+++ b/src/core/telemetry/index.ts
@@ -28,9 +28,12 @@ import {
 // across every subpath bundle (`assets`, `feedback`, `tasks`, …).
 const sdkClient = getOrCreateClient(CLOUD_ROLE_NAME);
 
+/** @internal */
 export const track = createTrack(sdkClient);
+/** @internal */
 export const trackEvent = createTrackEvent(sdkClient);
 
+/** @internal */
 export const telemetryClient = {
     initialize(context?: TelemetryContext): void {
         sdkClient.initialize({
diff --git a/src/core/uipath.ts b/src/core/uipath.ts
index 9fe756352..5ff9e4100 100644
--- a/src/core/uipath.ts
+++ b/src/core/uipath.ts
@@ -64,6 +64,11 @@ export class UiPath implements IUiPath {
   /** Read-only config for user convenience */
   public readonly config!: Readonly<BaseConfig>;
 
+  /**
+   * Creates a UiPath SDK instance.
+   *
+   * @param config - Optional SDK configuration; when omitted, configuration is loaded from meta tags
+   */
   constructor(config?: PartialUiPathConfig) {
     // Load configuration from meta tags
     const configFromMetaTags = loadFromMetaTags();
diff --git a/src/models/conversational-agent/agents/agents.models.ts b/src/models/conversational-agent/agents/agents.models.ts
index e43ac570d..9bf9815de 100644
--- a/src/models/conversational-agent/agents/agents.models.ts
+++ b/src/models/conversational-agent/agents/agents.models.ts
@@ -91,6 +91,13 @@ function createAgentMethods(
   };
 }
 
+/**
+ * Combines raw agent data with bound methods.
+ *
+ * @param agentData - The raw agent data from API
+ * @param conversationService - The conversation service instance
+ * @returns An agent object with added methods
+ */
 export function createAgentWithMethods<T extends RawAgentGetResponse>(
   agentData: T,
   conversationService: ConversationServiceModel
diff --git a/src/models/conversational-agent/conversations/conversations.models.ts b/src/models/conversational-agent/conversations/conversations.models.ts
index fb6a83629..3f43c9daa 100644
--- a/src/models/conversational-agent/conversations/conversations.models.ts
+++ b/src/models/conversational-agent/conversations/conversations.models.ts
@@ -31,16 +31,23 @@ import type { SessionStream } from './types/events/session.types';
 export interface ConversationSessionMethods {
   /**
    * Starts a real-time chat session for a conversation
+   *
+   * @param conversationId - The conversation ID
+   * @param options - Optional session options
    */
   startSession(conversationId: string, options?: ConversationSessionOptions): SessionStream;
 
   /**
    * Gets an active session for a conversation
+   *
+   * @param conversationId - The conversation ID
    */
   getSession(conversationId: string): SessionStream | undefined;
 
   /**
    * Ends an active session for a conversation
+   *
+   * @param conversationId - The conversation ID
    */
   endSession(conversationId: string): void;
 }
diff --git a/src/models/data-fabric/entities.models.ts b/src/models/data-fabric/entities.models.ts
index 0b73a4558..8b243137e 100644
--- a/src/models/data-fabric/entities.models.ts
+++ b/src/models/data-fabric/entities.models.ts
@@ -1172,7 +1172,7 @@ function createEntityMethods(entityData: RawEntityGetResponse, service: EntitySe
 /**
  * Creates an actionable entity by combining entity metadata with data and management methods
  *
- * @param entityMetadata - Entity metadata
+ * @param entityData - The raw entity data from API
  * @param service - The entity service instance
  * @returns Entity metadata with added methods
  */
diff --git a/src/models/orchestrator/queues.models.ts b/src/models/orchestrator/queues.models.ts
index f91caed67..89db254b1 100644
--- a/src/models/orchestrator/queues.models.ts
+++ b/src/models/orchestrator/queues.models.ts
@@ -20,8 +20,7 @@ import { PaginatedResponse, NonPaginatedResponse, HasPaginationOptions } from '.
 export interface QueueServiceModel {
   /**
    * Gets all queues across folders with optional filtering and folder scoping
-   * 
-   * @signature getAll(options?) → Promise&lt;QueueGetResponse[]&gt;
+   *
    * @param options Query options including optional folderId and pagination options
    * @returns Promise resolving to either an array of queues NonPaginatedResponse<QueueGetResponse> or a PaginatedResponse<QueueGetResponse> when pagination options are used.
    * {@link QueueGetResponse}
@@ -66,6 +65,7 @@ export interface QueueServiceModel {
    * 
    * @param id - Queue ID
    * @param folderId - Required folder ID
+   * @param options - Optional query options
    * @returns Promise resolving to a queue definition
    * @example
    * ```typescript
diff --git a/src/services/orchestrator/queues/queues.ts b/src/services/orchestrator/queues/queues.ts
index d5ba70aa8..c2ade1f64 100644
--- a/src/services/orchestrator/queues/queues.ts
+++ b/src/services/orchestrator/queues/queues.ts
@@ -104,8 +104,9 @@ export class QueueService extends FolderScopedService implements QueueServiceMod
    * 
    * @param id - Queue ID
    * @param folderId - Required folder ID
+   * @param options - Optional query options
    * @returns Promise resolving to a queue definition
-   * 
+   *
    * @example
    * ```typescript
    * import { Queues } from '@uipath/uipath-typescript/queues';
diff --git a/typedoc.validation.json b/typedoc.validation.json
new file mode 100644
index 000000000..d6e3558be
--- /dev/null
+++ b/typedoc.validation.json
@@ -0,0 +1,12 @@
+{
+  "$schema": "https://typedoc.org/schema.json",
+  "extends": "./typedoc.json",
+  "emit": "none",
+  "validation": {
+    "notDocumented": true,
+    "notExported": false,
+    "invalidLink": false
+  },
+  "requiredToBeDocumented": ["Method", "CallSignature", "Parameter"],
+  "treatValidationWarningsAsErrors": true
+}