Add proposed API for prompt files providers

src/vs/platform/extensions/common/extensionsApiProposals.ts

@@ -53,6 +53,10 @@ const _allApiProposals = {
 		proposal: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.chatParticipantPrivate.d.ts',
 		version: 11
 	},
+	chatPromptFiles: {
+		proposal: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.chatPromptFiles.d.ts',
+		version: 1
+	},
 	chatProvider: {
 		proposal: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.chatProvider.d.ts',
 		version: 4

src/vs/workbench/api/browser/mainThreadChatAgents2.ts

@@ -26,7 +26,8 @@ import { IUriIdentityService } from '../../../platform/uriIdentity/common/uriIde
 import { IChatWidgetService } from '../../contrib/chat/browser/chat.js';
 import { AddDynamicVariableAction, IAddDynamicVariableContext } from '../../contrib/chat/browser/attachments/chatDynamicVariables.js';
 import { IChatAgentHistoryEntry, IChatAgentImplementation, IChatAgentRequest, IChatAgentService } from '../../contrib/chat/common/participants/chatAgents.js';
-import { ICustomAgentQueryOptions, IPromptsService } from '../../contrib/chat/common/promptSyntax/service/promptsService.js';
+import { IPromptFileContext, IPromptsService } from '../../contrib/chat/common/promptSyntax/service/promptsService.js';
+import { isValidPromptType } from '../../contrib/chat/common/promptSyntax/promptTypes.js';
 import { IChatEditingService, IChatRelatedFileProviderMetadata } from '../../contrib/chat/common/editing/chatEditingService.js';
 import { IChatModel } from '../../contrib/chat/common/model/chatModel.js';
 import { ChatRequestAgentPart } from '../../contrib/chat/common/requestParser/chatParserTypes.js';
@@ -96,8 +97,8 @@ export class MainThreadChatAgents2 extends Disposable implements MainThreadChatA
 
 	private readonly _chatRelatedFilesProviders = this._register(new DisposableMap<number, IDisposable>());
 
-	private readonly _customAgentsProviders = this._register(new DisposableMap<number, IDisposable>());
-	private readonly _customAgentsProviderEmitters = this._register(new DisposableMap<number, Emitter<void>>());
+	private readonly _promptFileProviders = this._register(new DisposableMap<number, IDisposable>());
+	private readonly _promptFileProviderEmitters = this._register(new DisposableMap<number, Emitter<void>>());
 
 	private readonly _pendingProgress = new Map<string, { progress: (parts: IChatProgress[]) => void; chatSession: IChatModel | undefined }>();
 	private readonly _proxy: ExtHostChatAgentsShape2;
@@ -435,41 +436,46 @@ export class MainThreadChatAgents2 extends Disposable implements MainThreadChatA
 		this._chatRelatedFilesProviders.deleteAndDispose(handle);
 	}
 
-	async $registerCustomAgentsProvider(handle: number, extensionId: ExtensionIdentifier): Promise<void> {
+	async $registerPromptFileProvider(handle: number, type: string, extensionId: ExtensionIdentifier): Promise<void> {
 		const extension = await this._extensionService.getExtension(extensionId.value);
 		if (!extension) {
-			this._logService.error(`[MainThreadChatAgents2] Could not find extension for CustomAgentsProvider: ${extensionId.value}`);
+			this._logService.error(`[MainThreadChatAgents2] Could not find extension for prompt file provider: ${extensionId.value}`);
+			return;
+		}
+
+		if (!isValidPromptType(type)) {
+			this._logService.error(`[MainThreadChatAgents2] Invalid contribution type: ${type}`);
 			return;
 		}
 
 		const emitter = new Emitter<void>();
-		this._customAgentsProviderEmitters.set(handle, emitter);
+		this._promptFileProviderEmitters.set(handle, emitter);
 
-		const disposable = this._promptsService.registerCustomAgentsProvider(extension, {
-			onDidChangeCustomAgents: emitter.event,
-			provideCustomAgents: async (options: ICustomAgentQueryOptions, token: CancellationToken) => {
-				const agents = await this._proxy.$provideCustomAgents(handle, options, token);
-				if (!agents) {
+		const disposable = this._promptsService.registerPromptFileProvider(extension, type, {
+			onDidChangePromptFiles: emitter.event,
+			providePromptFiles: async (context: IPromptFileContext, token: CancellationToken) => {
+				const contributions = await this._proxy.$providePromptFiles(handle, type, context, token);
+				if (!contributions) {
 					return undefined;
 				}
 				// Convert UriComponents to URI
-				return agents.map(agent => ({
-					...agent,
-					uri: URI.revive(agent.uri)
+				return contributions.map(c => ({
+					...c,
+					uri: URI.revive(c.uri)
 				}));
 			}
 		});
 
-		this._customAgentsProviders.set(handle, disposable);
+		this._promptFileProviders.set(handle, disposable);
 	}
 
-	$unregisterCustomAgentsProvider(handle: number): void {
-		this._customAgentsProviders.deleteAndDispose(handle);
-		this._customAgentsProviderEmitters.deleteAndDispose(handle);
+	$unregisterPromptFileProvider(handle: number): void {
+		this._promptFileProviders.deleteAndDispose(handle);
+		this._promptFileProviderEmitters.deleteAndDispose(handle);
 	}
 
-	$onDidChangeCustomAgents(handle: number): void {
-		const emitter = this._customAgentsProviderEmitters.get(handle);
+	$onDidChangePromptFiles(handle: number): void {
+		const emitter = this._promptFileProviderEmitters.get(handle);
 		if (emitter) {
 			emitter.fire();
 		}

src/vs/workbench/api/common/extHost.api.impl.ts

@@ -23,6 +23,7 @@ import { getRemoteName } from '../../../platform/remote/common/remoteHosts.js';
 import { TelemetryTrustedValue } from '../../../platform/telemetry/common/telemetryUtils.js';
 import { EditSessionIdentityMatch } from '../../../platform/workspace/common/editSessions.js';
 import { DebugConfigurationProviderTriggerKind } from '../../contrib/debug/common/debug.js';
+import { PromptsType } from '../../contrib/chat/common/promptSyntax/promptTypes.js';
 import { ExtensionDescriptionRegistry } from '../../services/extensions/common/extensionDescriptionRegistry.js';
 import { UIKind } from '../../services/extensions/common/extensionHostProtocol.js';
 import { checkProposedApiEnabled, isProposedApiEnabled } from '../../services/extensions/common/extensions.js';
@@ -1541,9 +1542,17 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 				checkProposedApiEnabled(extension, 'chatContextProvider');
 				return extHostChatContext.registerChatContextProvider(selector ? checkSelector(selector) : undefined, `${extension.id}-${id}`, provider);
 			},
-			registerCustomAgentsProvider(provider: vscode.CustomAgentsProvider): vscode.Disposable {
-				checkProposedApiEnabled(extension, 'chatParticipantPrivate');
-				return extHostChatAgents2.registerCustomAgentsProvider(extension, provider);
+			registerCustomAgentProvider(provider: vscode.CustomAgentProvider): vscode.Disposable {
+				checkProposedApiEnabled(extension, 'chatPromptFiles');
+				return extHostChatAgents2.registerPromptFileProvider(extension, PromptsType.agent, provider);
+			},
+			registerInstructionsProvider(provider: vscode.InstructionsProvider): vscode.Disposable {
+				checkProposedApiEnabled(extension, 'chatPromptFiles');
+				return extHostChatAgents2.registerPromptFileProvider(extension, PromptsType.instructions, provider);
+			},
+			registerPromptFileProvider(provider: vscode.PromptFileProvider): vscode.Disposable {
+				checkProposedApiEnabled(extension, 'chatPromptFiles');
+				return extHostChatAgents2.registerPromptFileProvider(extension, PromptsType.prompt, provider);
 			},
 		};
 

src/vs/workbench/api/common/extHost.protocol.ts

@@ -65,7 +65,7 @@ import { IChatRequestVariableValue } from '../../contrib/chat/common/attachments
 import { ChatAgentLocation } from '../../contrib/chat/common/constants.js';
 import { IChatMessage, IChatResponsePart, ILanguageModelChatMetadataAndIdentifier, ILanguageModelChatSelector } from '../../contrib/chat/common/languageModels.js';
 import { IPreparedToolInvocation, IToolInvocation, IToolInvocationPreparationContext, IToolProgressStep, IToolResult, ToolDataSource } from '../../contrib/chat/common/tools/languageModelToolsService.js';
-import { ICustomAgentQueryOptions, IExternalCustomAgent } from '../../contrib/chat/common/promptSyntax/service/promptsService.js';
+import { IPromptFileContext, IPromptFileResource } from '../../contrib/chat/common/promptSyntax/service/promptsService.js';
 import { DebugConfigurationProviderTriggerKind, IAdapterDescriptor, IConfig, IDebugSessionReplMode, IDebugTestRunReference, IDebugVisualization, IDebugVisualizationContext, IDebugVisualizationTreeItem, MainThreadDebugVisualization } from '../../contrib/debug/common/debug.js';
 import { McpCollectionDefinition, McpConnectionState, McpServerDefinition, McpServerLaunch } from '../../contrib/mcp/common/mcpTypes.js';
 import * as notebookCommon from '../../contrib/notebook/common/notebookCommon.js';
@@ -99,6 +99,7 @@ import { ISaveProfileResult } from '../../services/userDataProfile/common/userDa
 import { IExtHostDocumentSaveDelegate } from './extHostDocumentData.js';
 import { TerminalShellExecutionCommandLineConfidence } from './extHostTypes.js';
 import * as tasks from './shared/tasks.js';
+import { PromptsType } from '../../contrib/chat/common/promptSyntax/promptTypes.js';
 
 export type IconPathDto =
 	| UriComponents
@@ -1394,9 +1395,9 @@ export interface MainThreadChatAgentsShape2 extends IChatAgentProgressShape, IDi
 	$unregisterChatParticipantDetectionProvider(handle: number): void;
 	$registerRelatedFilesProvider(handle: number, metadata: IChatRelatedFilesProviderMetadata): void;
 	$unregisterRelatedFilesProvider(handle: number): void;
-	$registerCustomAgentsProvider(handle: number, extension: ExtensionIdentifier): void;
-	$unregisterCustomAgentsProvider(handle: number): void;
-	$onDidChangeCustomAgents(handle: number): void;
+	$registerPromptFileProvider(handle: number, type: string, extension: ExtensionIdentifier): void;
+	$unregisterPromptFileProvider(handle: number): void;
+	$onDidChangePromptFiles(handle: number): void;
 	$registerAgentCompletionsProvider(handle: number, id: string, triggerCharacters: string[]): void;
 	$unregisterAgentCompletionsProvider(handle: number, id: string): void;
 	$updateAgent(handle: number, metadataUpdate: IExtensionChatAgentMetadata): void;
@@ -1462,7 +1463,7 @@ export interface ExtHostChatAgentsShape2 {
 	$releaseSession(sessionResource: UriComponents): void;
 	$detectChatParticipant(handle: number, request: Dto<IChatAgentRequest>, context: { history: IChatAgentHistoryEntryDto[] }, options: { participants: IChatParticipantMetadata[]; location: ChatAgentLocation }, token: CancellationToken): Promise<IChatParticipantDetectionResult | null | undefined>;
 	$provideRelatedFiles(handle: number, request: Dto<IChatRequestDraft>, token: CancellationToken): Promise<Dto<IChatRelatedFile>[] | undefined>;
-	$provideCustomAgents(handle: number, options: ICustomAgentQueryOptions, token: CancellationToken): Promise<Dto<IExternalCustomAgent>[] | undefined>;
+	$providePromptFiles(handle: number, type: PromptsType, context: IPromptFileContext, token: CancellationToken): Promise<Dto<IPromptFileResource>[] | undefined>;
 	$setRequestTools(requestId: string, tools: UserSelectedTools): void;
 }
 export interface IChatParticipantMetadata {

src/vs/workbench/api/common/extHostChatAgents2.ts

@@ -35,7 +35,8 @@ import { ExtHostLanguageModels } from './extHostLanguageModels.js';
 import { ExtHostLanguageModelTools } from './extHostLanguageModelTools.js';
 import * as typeConvert from './extHostTypeConverters.js';
 import * as extHostTypes from './extHostTypes.js';
-import { ICustomAgentQueryOptions, IExternalCustomAgent } from '../../contrib/chat/common/promptSyntax/service/promptsService.js';
+import { IPromptFileContext, IPromptFileResource } from '../../contrib/chat/common/promptSyntax/service/promptsService.js';
+import { PromptsType } from '../../contrib/chat/common/promptSyntax/promptTypes.js';
 import { ExtHostDocumentsAndEditors } from './extHostDocumentsAndEditors.js';
 
 export class ChatAgentResponseStream {
@@ -398,8 +399,8 @@ export class ExtHostChatAgents2 extends Disposable implements ExtHostChatAgentsS
 	private static _relatedFilesProviderIdPool = 0;
 	private readonly _relatedFilesProviders = new Map<number, ExtHostRelatedFilesProvider>();
 
-	private static _customAgentsProviderIdPool = 0;
-	private readonly _customAgentsProviders = new Map<number, { extension: IExtensionDescription; provider: vscode.CustomAgentsProvider }>();
+	private static _contributionsProviderIdPool = 0;
+	private readonly _promptFileProviders = new Map<number, { extension: IExtensionDescription; provider: vscode.CustomAgentProvider | vscode.InstructionsProvider | vscode.PromptFileProvider }>();
 
 	private readonly _sessionDisposables: DisposableResourceMap<DisposableStore> = this._register(new DisposableResourceMap());
 	private readonly _completionDisposables: DisposableMap<number, DisposableStore> = this._register(new DisposableMap());
@@ -479,23 +480,41 @@ export class ExtHostChatAgents2 extends Disposable implements ExtHostChatAgentsS
 		});
 	}
 
-	registerCustomAgentsProvider(extension: IExtensionDescription, provider: vscode.CustomAgentsProvider): vscode.Disposable {
-		const handle = ExtHostChatAgents2._customAgentsProviderIdPool++;
-		this._customAgentsProviders.set(handle, { extension, provider });
-		this._proxy.$registerCustomAgentsProvider(handle, extension.identifier);
+	/**
+	 * Internal method that handles all prompt file provider types.
+	 * Routes custom agents, instructions, and prompt files to the unified internal implementation.
+	 */
+	registerPromptFileProvider(extension: IExtensionDescription, type: PromptsType, provider: vscode.CustomAgentProvider | vscode.InstructionsProvider | vscode.PromptFileProvider): vscode.Disposable {
+		const handle = ExtHostChatAgents2._contributionsProviderIdPool++;
+		this._promptFileProviders.set(handle, { extension, provider });
+		this._proxy.$registerPromptFileProvider(handle, type, extension.identifier);
 
 		const disposables = new DisposableStore();
 
 		// Listen to provider change events and notify main thread
-		if (provider.onDidChangeCustomAgents) {
-			disposables.add(provider.onDidChangeCustomAgents(() => {
-				this._proxy.$onDidChangeCustomAgents(handle);
+		// Check for the appropriate event based on the provider type
+		let changeEvent: vscode.Event<void> | undefined;
+		switch (type) {
+			case PromptsType.agent:
+				changeEvent = (provider as vscode.CustomAgentProvider).onDidChangeCustomAgents;
+				break;
+			case PromptsType.instructions:
+				changeEvent = (provider as vscode.InstructionsProvider).onDidChangeInstructions;
+				break;
+			case PromptsType.prompt:
+				changeEvent = (provider as vscode.PromptFileProvider).onDidChangePromptFiles;
+				break;
+		}
+
+		if (changeEvent) {
+			disposables.add(changeEvent(() => {
+				this._proxy.$onDidChangePromptFiles(handle);
 			}));
 		}
 
 		disposables.add(toDisposable(() => {
-			this._customAgentsProviders.delete(handle);
-			this._proxy.$unregisterCustomAgentsProvider(handle);
+			this._promptFileProviders.delete(handle);
+			this._proxy.$unregisterPromptFileProvider(handle);
 		}));
 
 		return disposables;
@@ -511,13 +530,21 @@ export class ExtHostChatAgents2 extends Disposable implements ExtHostChatAgentsS
 		return await provider.provider.provideRelatedFiles(extRequestDraft, token) ?? undefined;
 	}
 
-	async $provideCustomAgents(handle: number, options: ICustomAgentQueryOptions, token: CancellationToken): Promise<IExternalCustomAgent[] | undefined> {
-		const providerData = this._customAgentsProviders.get(handle);
+	async $providePromptFiles(handle: number, type: PromptsType, context: IPromptFileContext, token: CancellationToken): Promise<IPromptFileResource[] | undefined> {
+		const providerData = this._promptFileProviders.get(handle);
 		if (!providerData) {
-			return Promise.resolve(undefined);
+			return undefined;
 		}
 
-		return await providerData.provider.provideCustomAgents(options, token) ?? undefined;
+		const provider = providerData.provider;
+		switch (type) {
+			case PromptsType.agent:
+				return await (provider as vscode.CustomAgentProvider).provideCustomAgents(context, token) ?? undefined;
+			case PromptsType.instructions:
+				return await (provider as vscode.InstructionsProvider).provideInstructions(context, token) ?? undefined;
+			case PromptsType.prompt:
+				return await (provider as vscode.PromptFileProvider).providePromptFiles(context, token) ?? undefined;
+		}
 	}
 
 	async $detectChatParticipant(handle: number, requestDto: Dto<IChatAgentRequest>, context: { history: IChatAgentHistoryEntryDto[] }, options: { location: ChatAgentLocation; participants?: vscode.ChatParticipantMetadata[] }, token: CancellationToken): Promise<vscode.ChatParticipantDetectionResult | null | undefined> {

src/vs/workbench/contrib/chat/common/promptSyntax/service/promptsService.ts

@@ -16,29 +16,21 @@ import { IHandOff, ParsedPromptFile } from '../promptFileParser.js';
 import { ResourceSet } from '../../../../../../base/common/map.js';
 
 /**
- * Activation event for custom agent providers.
+ * Activation events for prompt file providers.
  */
-export const CUSTOM_AGENTS_PROVIDER_ACTIVATION_EVENT = 'onCustomAgentsProvider';
+export const CUSTOM_AGENT_PROVIDER_ACTIVATION_EVENT = 'onCustomAgentProvider';
+export const INSTRUCTIONS_PROVIDER_ACTIVATION_EVENT = 'onInstructionsProvider';
+export const PROMPT_FILE_PROVIDER_ACTIVATION_EVENT = 'onPromptFileProvider';
 
 /**
- * Options for querying custom agents.
+ * Context for querying prompt files.
  */
-export interface ICustomAgentQueryOptions { }
+export interface IPromptFileContext { }
 
 /**
- * Represents a custom agent resource from an external provider.
+ * Represents a prompt file resource from an external provider.
  */
-export interface IExternalCustomAgent {
-	/**
-	 * The unique identifier/name of the custom agent resource.
-	 */
-	readonly name: string;
-
-	/**
-	 * A description of what the custom agent resource does.
-	 */
-	readonly description: string;
-
+export interface IPromptFileResource {
 	/**
 	 * The URI to the agent or prompt resource file.
 	 */
@@ -316,15 +308,15 @@ export interface IPromptsService extends IDisposable {
 	setDisabledPromptFiles(type: PromptsType, uris: ResourceSet): void;
 
 	/**
-	 * Registers a CustomAgentsProvider that can provide custom agents for repositories.
-	 * This is part of the proposed API and requires the chatParticipantPrivate proposal.
+	 * Registers a prompt file provider that can provide prompt files for repositories.
 	 * @param extension The extension registering the provider.
+	 * @param type The type of contribution.
 	 * @param provider The provider implementation with optional change event.
 	 * @returns A disposable that unregisters the provider when disposed.
 	 */
-	registerCustomAgentsProvider(extension: IExtensionDescription, provider: {
-		onDidChangeCustomAgents?: Event<void>;
-		provideCustomAgents: (options: ICustomAgentQueryOptions, token: CancellationToken) => Promise<IExternalCustomAgent[] | undefined>;
+	registerPromptFileProvider(extension: IExtensionDescription, type: PromptsType, provider: {
+		onDidChangePromptFiles?: Event<void>;
+		providePromptFiles: (context: IPromptFileContext, token: CancellationToken) => Promise<IPromptFileResource[] | undefined>;
 	}): IDisposable;
 
 	/**