use the chat participant within the chat session to replay a chat

package.json

@@ -1652,15 +1652,6 @@
 						]
 					}
 				]
-			},
-			{
-				"id": "github.copilot.chatReplay",
-				"name": "chatReplay",
-				"fullName": "Chat Replay",
-				"when": "debugType == 'vscode-chat-replay'",
-				"locations": [
-					"panel"
-				]
 			}
 		],
 		"languageModelChatProviders": [
@@ -4056,6 +4047,13 @@
 						"description": "Complete a security review of the pending changes on the current branch"
 					}
 				]
+			},
+			{
+				"id": "chat-replay",
+				"type": "chat-replay",
+				"name": "replay",
+				"displayName": "Chat Replay",
+				"description": "Replay chat sessions from JSON files"
 			}
 		],
 		"debuggers": [
@@ -4267,4 +4265,4 @@
 		"string_decoder": "npm:[email protected]",
 		"node-gyp": "npm:[email protected]"
 	}
-}
+}

src/extension/conversation/vscode-node/chatParticipants.ts

@@ -87,7 +87,6 @@ class ChatAgents implements IDisposable {
 		this._disposables.add(this.registerVSCodeAgent());
 		this._disposables.add(this.registerTerminalAgent());
 		this._disposables.add(this.registerTerminalPanelAgent());
-		this._disposables.add(this.registerReplayAgent());
 	}
 
 	private createAgent(name: string, defaultIntentIdOrGetter: IntentOrGetter, options?: { id?: string }): vscode.ChatParticipant {
@@ -250,13 +249,6 @@ Learn more about [GitHub Copilot](https://docs.github.com/copilot/using-github-c
 		return defaultAgent;
 	}
 
-	private registerReplayAgent(): IDisposable {
-		const defaultAgent = this.createAgent('chatReplay', Intent.ChatReplay);
-		defaultAgent.iconPath = new vscode.ThemeIcon('copilot');
-
-		return defaultAgent;
-	}
-
 	private getChatParticipantHandler(id: string, name: string, defaultIntentIdOrGetter: IntentOrGetter, onRequestPaused: Event<vscode.ChatParticipantPauseStateEvent>): vscode.ChatExtendedRequestHandler {
 		return async (request, context, stream, token): Promise<vscode.ChatResult> => {
 

src/extension/intents/node/allIntents.ts

@@ -8,7 +8,6 @@ import { SyncDescriptor } from '../../../util/vs/platform/instantiation/common/d
 import { IntentRegistry } from '../../prompt/node/intentRegistry';
 import { AgentIntent } from './agentIntent';
 import { AskAgentIntent } from './askAgentIntent';
-import { ChatReplayIntent } from './chatReplayIntent';
 import { InlineDocIntent } from './docIntent';
 import { EditCodeIntent } from './editCodeIntent';
 import { EditCode2Intent } from './editCodeIntent2';
@@ -54,6 +53,5 @@ IntentRegistry.setIntents([
 	new SyncDescriptor(SearchPanelIntent),
 	new SyncDescriptor(SearchKeywordsIntent),
 	new SyncDescriptor(AskAgentIntent),
-	new SyncDescriptor(NotebookEditorIntent),
-	new SyncDescriptor(ChatReplayIntent)
+	new SyncDescriptor(NotebookEditorIntent)
 ]);

src/extension/intents/node/chatReplayIntent.ts

@@ -70,7 +70,7 @@ export class ChatReplayIntent implements IIntent {
 				break;
 			case 'toolCall':
 				{
-					replay.setToolResult(step.id, step.results);
+
 					const result = await this.toolsService.invokeTool(ToolName.ToolReplay,
 						{
 							toolInvocationToken: toolToken,

src/extension/replay/common/chatReplayResponses.ts

@@ -41,15 +41,14 @@ type Request = {
 	id: string;
 	line: number;
 	prompt: string;
-	result: string;
+	result: string | string[];
 }
 
 export type ChatStep = UserQuery | Request | ToolStep;
 
 export class ChatReplayResponses {
 	private pendingRequests: DeferredPromise<ChatStep | 'finished'>[] = [];
 	private responses: (ChatStep | 'finished')[] = [];
-	private toolResults: Map<string, string[]> = new Map();
 
 	public static instance: ChatReplayResponses;
 
@@ -88,14 +87,6 @@ export class ChatReplayResponses {
 		return deferred.p;
 	}
 
-	public setToolResult(id: string, result: string[]): void {
-		this.toolResults.set(id, result);
-	}
-
-	public getToolResult(id: string): string[] | undefined {
-		return this.toolResults.get(id);
-	}
-
 	public markDone(): void {
 		while (this.pendingRequests.length > 0) {
 			const waiter = this.pendingRequests.shift();

src/extension/replay/common/replayParser.ts

@@ -0,0 +1,159 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as fs from 'node:fs';
+import { ChatStep } from './chatReplayResponses';
+
+export interface ReplayData {
+	chatSteps: ChatStep[];
+	filePath: string;
+}
+
+/**
+ * Parses a replay file and returns the chat steps with line numbers
+ * @param filePath The absolute path to the replay file
+ * @returns The parsed replay data containing chat steps and file path
+ */
+export function parseReplayFromFile(filePath: string): ReplayData {
+	if (!fs.existsSync(filePath)) {
+		throw new Error(`Replay file not found: ${filePath}`);
+	}
+
+	try {
+		const content = fs.readFileSync(filePath, 'utf8');
+		const chatSteps = parseReplayContent(content);
+		return {
+			chatSteps,
+			filePath
+		};
+	} catch (error) {
+		throw new Error(`Failed to parse replay file ${filePath}: ${error}`);
+	}
+}
+
+/**
+ * Parses a replay file from a session ID (base64 encoded file path)
+ * @param sessionId The session ID (base64 encoded file path, optionally prefixed with 'debug:')
+ * @returns The parsed replay data containing chat steps and file path
+ */
+export function parseReplayFromSessionId(sessionId: string): ReplayData {
+	const filePath = getFilePathFromSessionId(sessionId);
+	if (!filePath) {
+		throw new Error(`Invalid session ID: ${sessionId}`);
+	}
+	return parseReplayFromFile(filePath);
+}
+
+/**
+ * Converts a session ID to a file path
+ * @param sessionId The session ID (base64 encoded file path, optionally prefixed with 'debug:')
+ * @returns The decoded file path, or undefined if the session ID is invalid
+ */
+export function getFilePathFromSessionId(sessionId: string): string | undefined {
+	try {
+		// Handle debug session IDs by removing the debug prefix
+		const actualSessionId = sessionId.startsWith('debug:') ? sessionId.substring(6) : sessionId;
+		return Buffer.from(actualSessionId, 'base64').toString('utf8');
+	} catch {
+		return undefined;
+	}
+}
+
+/**
+ * Creates a session ID from a file path
+ * @param filePath The absolute path to the replay file
+ * @param isDebugSession Whether this is a debug session (adds 'debug:' prefix)
+ * @returns The base64 encoded session ID
+ */
+export function createSessionIdFromFilePath(filePath: string): string {
+	return Buffer.from(filePath).toString('base64');
+}
+
+/**
+ * Parses the replay content and assigns line numbers to each step
+ * @param content The raw replay file content
+ * @returns Array of chat steps with line numbers
+ */
+function parseReplayContent(content: string): ChatStep[] {
+	const parsed = JSON.parse(content);
+	const prompts = (parsed.prompts && Array.isArray(parsed.prompts) ? parsed.prompts : [parsed]) as { [key: string]: any }[];
+
+	if (prompts.filter(p => !p.prompt).length) {
+		throw new Error('Invalid replay content: expected a prompt object or an array of prompts in the base JSON structure.');
+	}
+
+	const steps: ChatStep[] = [];
+	for (const prompt of prompts) {
+		steps.push(...parsePrompt(prompt));
+	}
+
+	// Assign line numbers based on content
+	assignLineNumbers(steps, content);
+
+	return steps;
+}
+
+/**
+ * Parses a single prompt object into chat steps
+ */
+function parsePrompt(prompt: { [key: string]: any }): ChatStep[] {
+	const steps: ChatStep[] = [];
+	steps.push({
+		kind: 'userQuery',
+		query: prompt.prompt,
+		line: 0,
+	});
+
+	for (const log of prompt.logs) {
+		if (log.kind === 'toolCall') {
+			steps.push({
+				kind: 'toolCall',
+				id: log.id,
+				line: 0,
+				toolName: log.tool,
+				args: JSON.parse(log.args),
+				edits: log.edits,
+				results: log.response
+			});
+		} else if (log.kind === 'request') {
+			steps.push({
+				kind: 'request',
+				id: log.id,
+				line: 0,
+				prompt: log.messages,
+				result: log.response.message
+			});
+		}
+	}
+
+	return steps;
+}
+
+/**
+ * Assigns line numbers to steps based on their location in the content
+ */
+function assignLineNumbers(steps: ChatStep[], content: string): void {
+	let stepIx = 0;
+	const lines = content.split('\n');
+
+	lines.forEach((line, index) => {
+		if (stepIx < steps.length) {
+			const step = steps[stepIx];
+			if (step.kind === 'userQuery') {
+				const match = line.match(`"prompt": "${step.query.trim()}`);
+				if (match) {
+					step.line = index + 1;
+					stepIx++;
+				}
+			} else {
+				const match = line.match(`"id": "${step.id}"`);
+				if (match) {
+					step.line = index + 1;
+					stepIx++;
+				}
+			}
+		}
+	});
+}