rebrand: rename and publish as warrioraashuu-codemaster

mcp-server/src/http.ts

@@ -0,0 +1,172 @@
+#!/usr/bin/env node
+/**
+ * HTTP + SSE entrypoint — for remote hosting (Railway, Render, VPS, etc.)
+ *
+ * Supports:
+ *   - Streamable HTTP transport (POST /mcp for JSON-RPC, GET /mcp for SSE)
+ *   - Health check at GET /health
+ *
+ * Environment:
+ *   PORT                  — HTTP port (default: 3000)
+ *   CLAUDE_CODE_SRC_ROOT  — Path to Claude Code src/ directory
+ *   MCP_API_KEY           — Optional bearer token for authentication
+ */
+
+import express from "express";
+import { randomUUID } from "node:crypto";
+import { Server } from "@modelcontextprotocol/sdk/server/index.js";
+import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
+import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
+import { createServer, validateSrcRoot, SRC_ROOT } from "./server.js";
+
+const PORT = parseInt(process.env.PORT ?? "3000", 10);
+const API_KEY = process.env.MCP_API_KEY;
+
+// ---------------------------------------------------------------------------
+// Auth middleware (optional — only active when MCP_API_KEY is set)
+// ---------------------------------------------------------------------------
+
+function authMiddleware(
+  req: express.Request,
+  res: express.Response,
+  next: express.NextFunction
+): void {
+  if (!API_KEY) return next();
+  // Skip auth for health check
+  if (req.path === "/health") return next();
+
+  const auth = req.headers.authorization;
+  if (!auth || auth !== `Bearer ${API_KEY}`) {
+    res.status(401).json({ error: "Unauthorized" });
+    return;
+  }
+  next();
+}
+
+// ---------------------------------------------------------------------------
+// Streamable HTTP transport (modern MCP protocol)
+// ---------------------------------------------------------------------------
+
+async function startStreamableHTTP(app: express.Express): Promise<void> {
+  // Map of session ID -> transport
+  const transports = new Map<string, StreamableHTTPServerTransport>();
+
+  app.post("/mcp", async (req, res) => {
+    const sessionId =
+      (req.headers["mcp-session-id"] as string) ?? undefined;
+    let transport = sessionId ? transports.get(sessionId) : undefined;
+
+    if (!transport) {
+      // New session
+      const server = createServer();
+      transport = new StreamableHTTPServerTransport({
+        sessionIdGenerator: () => randomUUID(),
+      });
+      await server.connect(transport);
+
+      // Store session after first request so we can retrieve it later
+      transport.onclose = () => {
+        if (transport!.sessionId) {
+          transports.delete(transport!.sessionId);
+        }
+      };
+    }
+
+    await transport.handleRequest(req, res, req.body);
+
+    // After handling, store with the now-known session ID
+    if (transport.sessionId && !transports.has(transport.sessionId)) {
+      transports.set(transport.sessionId, transport);
+    }
+  });
+
+  // SSE stream endpoint for Streamable HTTP
+  app.get("/mcp", async (req, res) => {
+    const sessionId = req.headers["mcp-session-id"] as string | undefined;
+    if (!sessionId || !transports.has(sessionId)) {
+      res.status(400).json({ error: "Invalid or missing session ID" });
+      return;
+    }
+    const transport = transports.get(sessionId)!;
+    await transport.handleRequest(req, res);
+  });
+
+  // DELETE — session cleanup
+  app.delete("/mcp", async (req, res) => {
+    const sessionId = req.headers["mcp-session-id"] as string | undefined;
+    if (sessionId && transports.has(sessionId)) {
+      const transport = transports.get(sessionId)!;
+      await transport.close();
+      transports.delete(sessionId);
+    }
+    res.status(200).json({ ok: true });
+  });
+}
+
+// ---------------------------------------------------------------------------
+// Legacy SSE transport (for older clients)
+// ---------------------------------------------------------------------------
+
+async function startLegacySSE(app: express.Express): Promise<void> {
+  const transports = new Map<string, SSEServerTransport>();
+
+  app.get("/sse", async (_req, res) => {
+    const server = createServer();
+    const transport = new SSEServerTransport("/messages", res);
+    transports.set(transport.sessionId, transport);
+    transport.onclose = () => {
+      transports.delete(transport.sessionId);
+    };
+    await server.connect(transport);
+  });
+
+  app.post("/messages", async (req, res) => {
+    const sessionId = req.query.sessionId as string;
+    const transport = transports.get(sessionId);
+    if (!transport) {
+      res.status(400).json({ error: "Unknown session" });
+      return;
+    }
+    await transport.handlePostMessage(req, res, req.body);
+  });
+}
+
+// ---------------------------------------------------------------------------
+// Main
+// ---------------------------------------------------------------------------
+
+async function main(): Promise<void> {
+  await validateSrcRoot();
+
+  const app = express();
+  app.use(express.json());
+  app.use(authMiddleware);
+
+  // Health check
+  app.get("/health", (_req, res) => {
+    res.json({
+      status: "ok",
+      server: "claude-code-explorer",
+      version: "1.1.0",
+      srcRoot: SRC_ROOT,
+    });
+  });
+
+  // Register both transports
+  await startStreamableHTTP(app);
+  await startLegacySSE(app);
+
+  app.listen(PORT, () => {
+    console.log(`Claude Code Explorer MCP (HTTP) listening on port ${PORT}`);
+    console.log(`  Streamable HTTP: POST/GET http://localhost:${PORT}/mcp`);
+    console.log(`  Legacy SSE:      GET http://localhost:${PORT}/sse`);
+    console.log(`  Health:          GET http://localhost:${PORT}/health`);
+    console.log(`  Source root:     ${SRC_ROOT}`);
+    if (API_KEY) console.log("  Auth:            Bearer token required");
+  });
+}
+
+main().catch((err) => {
+  console.error("Fatal error:", err);
+  process.exit(1);
+});

mcp-server/src/index.ts

@@ -0,0 +1,24 @@
+#!/usr/bin/env node
+/**
+ * STDIO entrypoint — for local use with Claude Desktop, Claude Code, etc.
+ *
+ * Usage:
+ *   node dist/index.js
+ *   CLAUDE_CODE_SRC_ROOT=/path/to/src node dist/index.js
+ */
+
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import { createServer, validateSrcRoot, SRC_ROOT } from "./server.js";
+
+async function main() {
+  await validateSrcRoot();
+  const server = createServer();
+  const transport = new StdioServerTransport();
+  await server.connect(transport);
+  console.error(`Claude Code Explorer MCP (stdio) started — src: ${SRC_ROOT}`);
+}
+
+main().catch((err) => {
+  console.error("Fatal error:", err);
+  process.exit(1);
+});

mcp-server/src/index.ts.new

@@ -0,0 +1,24 @@
+#!/usr/bin/env node
+/**
+ * STDIO entrypoint — for local use with Claude Desktop, Claude Code, etc.
+ *
+ * Usage:
+ *   node dist/index.js
+ *   CLAUDE_CODE_SRC_ROOT=/path/to/src node dist/index.js
+ */
+
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import { createServer, validateSrcRoot, SRC_ROOT } from "./server.js";
+
+async function main() {
+  await validateSrcRoot();
+  const server = createServer();
+  const transport = new StdioServerTransport();
+  await server.connect(transport);
+  console.error(`Claude Code Explorer MCP (stdio) started — src: ${SRC_ROOT}`);
+}
+
+main().catch((err) => {
+  console.error("Fatal error:", err);
+  process.exit(1);
+});

mcp-server/src/server.ts

@@ -0,0 +1,958 @@
+/**
+ * Shared MCP server definition — transport-agnostic.
+ *
+ * Exposes tools and resources for exploring the Claude Code source code.
+ * This module is imported by both the STDIO and HTTP entrypoints.
+ */
+
+import { Server } from "@modelcontextprotocol/sdk/server/index.js";
+import {
+  CallToolRequestSchema,
+  ListToolsRequestSchema,
+  ListResourcesRequestSchema,
+  ReadResourceRequestSchema,
+  ListResourceTemplatesRequestSchema,
+  ListPromptsRequestSchema,
+  GetPromptRequestSchema,
+} from "@modelcontextprotocol/sdk/types.js";
+import * as fs from "node:fs/promises";
+import * as path from "node:path";
+import { fileURLToPath } from "node:url";
+
+// ---------------------------------------------------------------------------
+// Configuration
+// ---------------------------------------------------------------------------
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+export const SRC_ROOT = path.resolve(
+  process.env.CLAUDE_CODE_SRC_ROOT ?? path.join(__dirname, "..", "..", "src")
+);
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+async function dirExists(p: string): Promise<boolean> {
+  try {
+    return (await fs.stat(p)).isDirectory();
+  } catch {
+    return false;
+  }
+}
+
+async function fileExists(p: string): Promise<boolean> {
+  try {
+    return (await fs.stat(p)).isFile();
+  } catch {
+    return false;
+  }
+}
+
+async function listDir(dir: string): Promise<string[]> {
+  try {
+    const entries = await fs.readdir(dir, { withFileTypes: true });
+    return entries
+      .map((e) => (e.isDirectory() ? e.name + "/" : e.name))
+      .sort();
+  } catch {
+    return [];
+  }
+}
+
+async function walkFiles(root: string, rel = ""): Promise<string[]> {
+  const results: string[] = [];
+  let entries;
+  try {
+    entries = await fs.readdir(path.join(root, rel), { withFileTypes: true });
+  } catch {
+    return results;
+  }
+  for (const e of entries) {
+    const child = rel ? `${rel}/${e.name}` : e.name;
+    if (e.isDirectory()) {
+      results.push(...(await walkFiles(root, child)));
+    } else {
+      results.push(child);
+    }
+  }
+  return results;
+}
+
+/** Safely resolve a user-supplied relative path under SRC_ROOT (blocks path traversal). */
+function safePath(relPath: string): string | null {
+  const resolved = path.resolve(SRC_ROOT, relPath);
+  if (!resolved.startsWith(SRC_ROOT)) return null;
+  return resolved;
+}
+
+// ---------------------------------------------------------------------------
+// Metadata Types
+// ---------------------------------------------------------------------------
+
+interface ToolInfo {
+  name: string;
+  directory: string;
+  files: string[];
+}
+
+interface CommandInfo {
+  name: string;
+  path: string;
+  isDirectory: boolean;
+  files?: string[];
+}
+
+async function getToolList(): Promise<ToolInfo[]> {
+  const toolsDir = path.join(SRC_ROOT, "tools");
+  const entries = await fs.readdir(toolsDir, { withFileTypes: true });
+  const tools: ToolInfo[] = [];
+  for (const e of entries) {
+    if (!e.isDirectory() || e.name === "shared" || e.name === "testing")
+      continue;
+    const files = await listDir(path.join(toolsDir, e.name));
+    tools.push({ name: e.name, directory: `tools/${e.name}`, files });
+  }
+  return tools.sort((a, b) => a.name.localeCompare(b.name));
+}
+
+async function getCommandList(): Promise<CommandInfo[]> {
+  const cmdsDir = path.join(SRC_ROOT, "commands");
+  const entries = await fs.readdir(cmdsDir, { withFileTypes: true });
+  const commands: CommandInfo[] = [];
+  for (const e of entries) {
+    if (e.isDirectory()) {
+      const files = await listDir(path.join(cmdsDir, e.name));
+      commands.push({
+        name: e.name,
+        path: `commands/${e.name}`,
+        isDirectory: true,
+        files,
+      });
+    } else {
+      commands.push({
+        name: e.name.replace(/\.(ts|tsx)$/, ""),
+        path: `commands/${e.name}`,
+        isDirectory: false,
+      });
+    }
+  }
+  return commands.sort((a, b) => a.name.localeCompare(b.name));
+}
+
+// ---------------------------------------------------------------------------
+// Server Factory
+// ---------------------------------------------------------------------------
+
+export function createServer(): Server {
+  const server = new Server(
+    { name: "claude-code-explorer", version: "1.1.0" },
+    {
+      capabilities: {
+        tools: {},
+        resources: {},
+        prompts: {},
+      },
+    }
+  );
+
+  // ---- Resources ---------------------------------------------------------
+
+  server.setRequestHandler(ListResourcesRequestSchema, async () => ({
+    resources: [
+      {
+        uri: "claude-code://architecture",
+        name: "Architecture Overview",
+        description:
+          "High-level overview of the Claude Code source architecture",
+        mimeType: "text/markdown",
+      },
+      {
+        uri: "claude-code://tools",
+        name: "Tool Registry",
+        description: "List of all agent tools with their files",
+        mimeType: "application/json",
+      },
+      {
+        uri: "claude-code://commands",
+        name: "Command Registry",
+        description: "List of all slash commands",
+        mimeType: "application/json",
+      },
+    ],
+  }));
+
+  server.setRequestHandler(
+    ListResourceTemplatesRequestSchema,
+    async () => ({
+      resourceTemplates: [
+        {
+          uriTemplate: "claude-code://source/{path}",
+          name: "Source file",
+          description:
+            "Read a source file from the Claude Code src/ directory",
+          mimeType: "text/plain",
+        },
+      ],
+    })
+  );
+
+  server.setRequestHandler(
+    ReadResourceRequestSchema,
+    async (request: { params: { uri: string } }) => {
+      const { uri } = request.params;
+
+      if (uri === "claude-code://architecture") {
+        const readmePath = path.resolve(SRC_ROOT, "..", "README.md");
+        let text: string;
+        try {
+          text = await fs.readFile(readmePath, "utf-8");
+        } catch {
+          text = "README.md not found.";
+        }
+        return { contents: [{ uri, mimeType: "text/markdown", text }] };
+      }
+
+      if (uri === "claude-code://tools") {
+        const tools = await getToolList();
+        return {
+          contents: [
+            {
+              uri,
+              mimeType: "application/json",
+              text: JSON.stringify(tools, null, 2),
+            },
+          ],
+        };
+      }
+
+      if (uri === "claude-code://commands") {
+        const commands = await getCommandList();
+        return {
+          contents: [
+            {
+              uri,
+              mimeType: "application/json",
+              text: JSON.stringify(commands, null, 2),
+            },
+          ],
+        };
+      }
+
+      if (uri.startsWith("claude-code://source/")) {
+        const relPath = uri.slice("claude-code://source/".length);
+        const abs = safePath(relPath);
+        if (!abs) throw new Error("Invalid path");
+        const text = await fs.readFile(abs, "utf-8");
+        return { contents: [{ uri, mimeType: "text/plain", text }] };
+      }
+
+      throw new Error(`Unknown resource: ${uri}`);
+    }
+  );
+
+  // ---- Tools -------------------------------------------------------------
+
+  server.setRequestHandler(ListToolsRequestSchema, async () => ({
+    tools: [
+      {
+        name: "list_tools",
+        description:
+          "List all Claude Code agent tools (BashTool, FileReadTool, etc.) with their source files.",
+        inputSchema: { type: "object" as const, properties: {} },
+      },
+      {
+        name: "list_commands",
+        description:
+          "List all Claude Code slash commands (/commit, /review, /mcp, etc.) with their source files.",
+        inputSchema: { type: "object" as const, properties: {} },
+      },
+      {
+        name: "get_tool_source",
+        description:
+          "Read the full source code of a specific Claude Code tool implementation.",
+        inputSchema: {
+          type: "object" as const,
+          properties: {
+            toolName: {
+              type: "string",
+              description: "Tool directory name, e.g. 'BashTool'",
+            },
+            fileName: {
+              type: "string",
+              description:
+                "Specific file within the tool directory. Omit for the main file.",
+            },
+          },
+          required: ["toolName"],
+        },
+      },
+      {
+        name: "get_command_source",
+        description:
+          "Read the source code of a specific Claude Code slash command.",
+        inputSchema: {
+          type: "object" as const,
+          properties: {
+            commandName: {
+              type: "string",
+              description: "Command name, e.g. 'commit', 'review'",
+            },
+            fileName: {
+              type: "string",
+              description: "Specific file within the command directory.",
+            },
+          },
+          required: ["commandName"],
+        },
+      },
+      {
+        name: "read_source_file",
+        description:
+          "Read any source file from the Claude Code src/ directory by relative path.",
+        inputSchema: {
+          type: "object" as const,
+          properties: {
+            path: {
+              type: "string",
+              description: "Relative path from src/, e.g. 'QueryEngine.ts'",
+            },
+            startLine: {
+              type: "number",
+              description: "1-based start line.",
+            },
+            endLine: {
+              type: "number",
+              description: "1-based end line.",
+            },
+          },
+          required: ["path"],
+        },
+      },
+      {
+        name: "search_source",
+        description:
+          "Search for a regex pattern across the Claude Code source. Returns matching lines with paths and line numbers.",
+        inputSchema: {
+          type: "object" as const,
+          properties: {
+            pattern: {
+              type: "string",
+              description: "Search pattern (regex).",
+            },
+            filePattern: {
+              type: "string",
+              description: "File extension filter, e.g. '.ts'",
+            },
+            maxResults: {
+              type: "number",
+              description: "Max matches (default: 50).",
+            },
+          },
+          required: ["pattern"],
+        },
+      },
+      {
+        name: "list_directory",
+        description: "List files and subdirectories under src/.",
+        inputSchema: {
+          type: "object" as const,
+          properties: {
+            path: {
+              type: "string",
+              description: "Relative path from src/, e.g. 'services'. '' for root.",
+            },
+          },
+          required: ["path"],
+        },
+      },
+      {
+        name: "get_architecture",
+        description:
+          "Get a high-level architecture overview of Claude Code.",
+        inputSchema: { type: "object" as const, properties: {} },
+      },
+    ],
+  }));
+
+  server.setRequestHandler(
+    CallToolRequestSchema,
+    async (request: {
+      params: { name: string; arguments?: Record<string, unknown> };
+    }) => {
+      const { name, arguments: args } = request.params;
+
+      switch (name) {
+        case "list_tools": {
+          const tools = await getToolList();
+          return {
+            content: [
+              { type: "text" as const, text: JSON.stringify(tools, null, 2) },
+            ],
+          };
+        }
+
+        case "list_commands": {
+          const commands = await getCommandList();
+          return {
+            content: [
+              {
+                type: "text" as const,
+                text: JSON.stringify(commands, null, 2),
+              },
+            ],
+          };
+        }
+
+        case "get_tool_source": {
+          const toolName = (args as Record<string, unknown>)
+            ?.toolName as string;
+          if (!toolName) throw new Error("toolName is required");
+          const toolDir = safePath(`tools/${toolName}`);
+          if (!toolDir || !(await dirExists(toolDir)))
+            throw new Error(`Tool not found: ${toolName}`);
+
+          let fileName = (args as Record<string, unknown>)?.fileName as
+            | string
+            | undefined;
+          if (!fileName) {
+            const files = await listDir(toolDir);
+            const main =
+              files.find(
+                (f) => f === `${toolName}.ts` || f === `${toolName}.tsx`
+              ) ??
+              files.find((f) => f.endsWith(".ts") || f.endsWith(".tsx"));
+            if (!main) throw new Error(`No source files in ${toolName}`);
+            fileName = main;
+          }
+
+          const filePath = safePath(`tools/${toolName}/${fileName}`);
+          if (!filePath || !(await fileExists(filePath)))
+            throw new Error(`File not found: tools/${toolName}/${fileName}`);
+          const content = await fs.readFile(filePath, "utf-8");
+          return {
+            content: [
+              {
+                type: "text" as const,
+                text: `// tools/${toolName}/${fileName}\n// ${content.split("\n").length} lines\n\n${content}`,
+              },
+            ],
+          };
+        }
+
+        case "get_command_source": {
+          const commandName = (args as Record<string, unknown>)
+            ?.commandName as string;
+          if (!commandName) throw new Error("commandName is required");
+
+          const candidates = [
+            `commands/${commandName}`,
+            `commands/${commandName}.ts`,
+            `commands/${commandName}.tsx`,
+          ];
+          let found: string | null = null;
+          let isDir = false;
+          for (const c of candidates) {
+            const abs = safePath(c);
+            if (abs && (await dirExists(abs))) {
+              found = abs;
+              isDir = true;
+              break;
+            }
+            if (abs && (await fileExists(abs))) {
+              found = abs;
+              break;
+            }
+          }
+          if (!found) throw new Error(`Command not found: ${commandName}`);
+
+          if (!isDir) {
+            const content = await fs.readFile(found, "utf-8");
+            return { content: [{ type: "text" as const, text: content }] };
+          }
+
+          const reqFile = (args as Record<string, unknown>)?.fileName as
+            | string
+            | undefined;
+          if (reqFile) {
+            const filePath = safePath(`commands/${commandName}/${reqFile}`);
+            if (!filePath || !(await fileExists(filePath)))
+              throw new Error(
+                `File not found: commands/${commandName}/${reqFile}`
+              );
+            const content = await fs.readFile(filePath, "utf-8");
+            return { content: [{ type: "text" as const, text: content }] };
+          }
+
+          const files = await listDir(found);
+          return {
+            content: [
+              {
+                type: "text" as const,
+                text: `Command: ${commandName}\nFiles:\n${files.map((f) => `  ${f}`).join("\n")}`,
+              },
+            ],
+          };
+        }
+
+        case "read_source_file": {
+          const relPath = (args as Record<string, unknown>)?.path as string;
+          if (!relPath) throw new Error("path is required");
+          const abs = safePath(relPath);
+          if (!abs || !(await fileExists(abs)))
+            throw new Error(`File not found: ${relPath}`);
+          const content = await fs.readFile(abs, "utf-8");
+          const lines = content.split("\n");
+          const start =
+            ((args as Record<string, unknown>)?.startLine as number) ?? 1;
+          const end =
+            ((args as Record<string, unknown>)?.endLine as number) ??
+            lines.length;
+          const slice = lines.slice(
+            Math.max(0, start - 1),
+            Math.min(lines.length, end)
+          );
+          return {
+            content: [
+              {
+                type: "text" as const,
+                text: slice
+                  .map(
+                    (l: string, i: number) =>
+                      `${(start + i).toString().padStart(5)} | ${l}`
+                  )
+                  .join("\n"),
+              },
+            ],
+          };
+        }
+
+        case "search_source": {
+          const pattern = (args as Record<string, unknown>)
+            ?.pattern as string;
+          if (!pattern) throw new Error("pattern is required");
+          const filePattern = (args as Record<string, unknown>)
+            ?.filePattern as string | undefined;
+          const maxResults =
+            ((args as Record<string, unknown>)?.maxResults as number) ?? 50;
+
+          let regex: RegExp;
+          try {
+            regex = new RegExp(pattern, "i");
+          } catch {
+            throw new Error(`Invalid regex pattern: ${pattern}`);
+          }
+
+          const allFiles = await walkFiles(SRC_ROOT);
+          const filtered = filePattern
+            ? allFiles.filter((f) => f.endsWith(filePattern))
+            : allFiles;
+
+          const matches: string[] = [];
+          for (const file of filtered) {
+            if (matches.length >= maxResults) break;
+            const abs = path.join(SRC_ROOT, file);
+            let content: string;
+            try {
+              content = await fs.readFile(abs, "utf-8");
+            } catch {
+              continue;
+            }
+            const lines = content.split("\n");
+            for (let i = 0; i < lines.length; i++) {
+              if (matches.length >= maxResults) break;
+              if (regex.test(lines[i]!)) {
+                matches.push(`${file}:${i + 1}: ${lines[i]!.trim()}`);
+              }
+            }
+          }
+
+          return {
+            content: [
+              {
+                type: "text" as const,
+                text:
+                  matches.length > 0
+                    ? `Found ${matches.length} match(es):\n\n${matches.join("\n")}`
+                    : "No matches found.",
+              },
+            ],
+          };
+        }
+
+        case "list_directory": {
+          const relPath =
+            ((args as Record<string, unknown>)?.path as string) ?? "";
+          const abs = safePath(relPath);
+          if (!abs || !(await dirExists(abs)))
+            throw new Error(`Directory not found: ${relPath}`);
+          const entries = await listDir(abs);
+          return {
+            content: [
+              {
+                type: "text" as const,
+                text:
+                  entries.length > 0
+                    ? entries.join("\n")
+                    : "(empty directory)",
+              },
+            ],
+          };
+        }
+
+        case "get_architecture": {
+          const topLevel = await listDir(SRC_ROOT);
+          const tools = await getToolList();
+          const commands = await getCommandList();
+
+          const overview = `# Claude Code Architecture Overview
+
+## Source Root
+${SRC_ROOT}
+
+## Top-Level Entries
+${topLevel.map((e) => `- ${e}`).join("\n")}
+
+## Agent Tools (${tools.length})
+${tools.map((t) => `- **${t.name}** — ${t.files.length} files: ${t.files.join(", ")}`).join("\n")}
+
+## Slash Commands (${commands.length})
+${commands.map((c) => `- **${c.name}** ${c.isDirectory ? "(directory)" : "(file)"}${c.files ? ": " + c.files.join(", ") : ""}`).join("\n")}
+
+## Key Files
+- **main.tsx** — CLI entrypoint (Commander.js)
+- **QueryEngine.ts** — Core LLM API caller, streaming, tool loops
+- **Tool.ts** — Base tool types, schemas, permission model
+- **commands.ts** — Command registry and loader
+- **tools.ts** — Tool registry and loader
+- **context.ts** — System/user context collection
+
+## Core Subsystems
+- **bridge/** — IDE integration (VS Code, JetBrains)
+- **coordinator/** — Multi-agent orchestration
+- **services/mcp/** — MCP client connections
+- **services/api/** — Anthropic API client
+- **plugins/** — Plugin system
+- **skills/** — Skill system
+- **tasks/** — Background task management
+- **server/** — Server/remote mode
+`;
+          return { content: [{ type: "text" as const, text: overview }] };
+        }
+
+        default:
+          throw new Error(`Unknown tool: ${name}`);
+      }
+    }
+  );
+
+  // ---- Prompts -----------------------------------------------------------
+
+  server.setRequestHandler(ListPromptsRequestSchema, async () => ({
+    prompts: [
+      {
+        name: "explain_tool",
+        description:
+          "Explain how a specific Claude Code tool works, including its input schema, permissions, and execution flow.",
+        arguments: [
+          {
+            name: "toolName",
+            description: "Tool directory name, e.g. 'BashTool', 'FileEditTool'",
+            required: true,
+          },
+        ],
+      },
+      {
+        name: "explain_command",
+        description: "Explain how a specific Claude Code slash command works.",
+        arguments: [
+          {
+            name: "commandName",
+            description: "Command name, e.g. 'commit', 'review', 'mcp'",
+            required: true,
+          },
+        ],
+      },
+      {
+        name: "architecture_overview",
+        description:
+          "Get a guided tour of the Claude Code architecture with explanations of each subsystem.",
+      },
+      {
+        name: "how_does_it_work",
+        description:
+          "Explain how a specific feature or subsystem of Claude Code works.",
+        arguments: [
+          {
+            name: "feature",
+            description:
+              "Feature or subsystem, e.g. 'permission system', 'MCP client', 'query engine', 'bridge'",
+            required: true,
+          },
+        ],
+      },
+      {
+        name: "compare_tools",
+        description:
+          "Compare two Claude Code tools side by side — purpose, inputs, permissions, implementation.",
+        arguments: [
+          { name: "tool1", description: "First tool name", required: true },
+          { name: "tool2", description: "Second tool name", required: true },
+        ],
+      },
+    ],
+  }));
+
+  server.setRequestHandler(
+    GetPromptRequestSchema,
+    async (request: {
+      params: { name: string; arguments?: Record<string, string> };
+    }) => {
+      const { name, arguments: args } = request.params;
+
+      switch (name) {
+        case "explain_tool": {
+          const toolName = args?.toolName;
+          if (!toolName) throw new Error("toolName argument is required");
+          const toolDir = safePath(`tools/${toolName}`);
+          if (!toolDir || !(await dirExists(toolDir)))
+            throw new Error(`Tool not found: ${toolName}`);
+          const files = await listDir(toolDir);
+          const mainFile =
+            files.find(
+              (f) => f === `${toolName}.ts` || f === `${toolName}.tsx`
+            ) ?? files.find((f) => f.endsWith(".ts") || f.endsWith(".tsx"));
+          let source = "";
+          if (mainFile) {
+            source = await fs.readFile(path.join(toolDir, mainFile), "utf-8");
+          }
+          return {
+            description: `Explanation of the ${toolName} tool`,
+            messages: [
+              {
+                role: "user" as const,
+                content: {
+                  type: "text" as const,
+                  text: `Analyze and explain this Claude Code tool implementation. Cover:\n1. Purpose\n2. Input Schema\n3. Permissions\n4. Execution Flow\n5. Output\n6. Safety characteristics\n\nFiles in tools/${toolName}/: ${files.join(", ")}\n\nMain source (${mainFile ?? "not found"}):\n\`\`\`typescript\n${source}\n\`\`\``,
+                },
+              },
+            ],
+          };
+        }
+
+        case "explain_command": {
+          const commandName = args?.commandName;
+          if (!commandName)
+            throw new Error("commandName argument is required");
+          const candidates = [
+            `commands/${commandName}`,
+            `commands/${commandName}.ts`,
+            `commands/${commandName}.tsx`,
+          ];
+          let found: string | null = null;
+          let isDir = false;
+          for (const c of candidates) {
+            const abs = safePath(c);
+            if (abs && (await dirExists(abs))) {
+              found = abs;
+              isDir = true;
+              break;
+            }
+            if (abs && (await fileExists(abs))) {
+              found = abs;
+              break;
+            }
+          }
+          if (!found) throw new Error(`Command not found: ${commandName}`);
+          let source = "";
+          let fileList = "";
+          if (isDir) {
+            const files = await listDir(found);
+            fileList = files.join(", ");
+            const indexFile = files.find(
+              (f) => f === "index.ts" || f === "index.tsx"
+            );
+            if (indexFile) {
+              source = await fs.readFile(
+                path.join(found, indexFile),
+                "utf-8"
+              );
+            }
+          } else {
+            source = await fs.readFile(found, "utf-8");
+            fileList = path.basename(found);
+          }
+          return {
+            description: `Explanation of the /${commandName} command`,
+            messages: [
+              {
+                role: "user" as const,
+                content: {
+                  type: "text" as const,
+                  text: `Analyze and explain this Claude Code slash command. Cover:\n1. Purpose\n2. Type (prompt vs action)\n3. Allowed Tools\n4. Arguments\n5. Implementation\n\nFiles: ${fileList}\n\nSource:\n\`\`\`typescript\n${source}\n\`\`\``,
+                },
+              },
+            ],
+          };
+        }
+
+        case "architecture_overview": {
+          const readmePath = path.resolve(SRC_ROOT, "..", "README.md");
+          let readme = "";
+          try {
+            readme = await fs.readFile(readmePath, "utf-8");
+          } catch {
+            /* */
+          }
+          const topLevel = await listDir(SRC_ROOT);
+          const tools = await getToolList();
+          const commands = await getCommandList();
+          return {
+            description: "Architecture overview of Claude Code",
+            messages: [
+              {
+                role: "user" as const,
+                content: {
+                  type: "text" as const,
+                  text: `Give a comprehensive guided tour of the Claude Code architecture.\n\n## README\n${readme}\n\n## src/ entries\n${topLevel.join("\n")}\n\n## Tools (${tools.length})\n${tools.map((t) => `- ${t.name}: ${t.files.join(", ")}`).join("\n")}\n\n## Commands (${commands.length})\n${commands.map((c) => `- ${c.name} ${c.isDirectory ? "(dir)" : "(file)"}`).join("\n")}`,
+                },
+              },
+            ],
+          };
+        }
+
+        case "how_does_it_work": {
+          const feature = args?.feature;
+          if (!feature) throw new Error("feature argument is required");
+          const featureMap: Record<string, string[]> = {
+            "permission system": [
+              "utils/permissions/",
+              "hooks/toolPermission/",
+              "Tool.ts",
+            ],
+            permissions: [
+              "utils/permissions/",
+              "hooks/toolPermission/",
+              "Tool.ts",
+            ],
+            "mcp client": [
+              "services/mcp/",
+              "tools/MCPTool/",
+              "tools/ListMcpResourcesTool/",
+            ],
+            mcp: ["services/mcp/", "entrypoints/mcp.ts", "tools/MCPTool/"],
+            "tool system": ["Tool.ts", "tools.ts", "tools/"],
+            tools: ["Tool.ts", "tools.ts"],
+            "query engine": ["QueryEngine.ts", "query/"],
+            bridge: ["bridge/"],
+            "ide integration": ["bridge/"],
+            context: ["context.ts", "context/"],
+            commands: ["commands.ts", "types/command.ts"],
+            "command system": ["commands.ts", "types/command.ts", "commands/"],
+            plugins: ["plugins/"],
+            skills: ["skills/"],
+            tasks: ["tasks.ts", "tasks/", "tools/TaskCreateTool/"],
+            coordinator: ["coordinator/", "tools/AgentTool/"],
+            "multi-agent": ["coordinator/", "tools/AgentTool/"],
+            memory: ["memdir/", "commands/memory/"],
+            voice: ["voice/"],
+            server: ["server/"],
+          };
+          const paths = featureMap[feature.toLowerCase()] ?? [];
+          let contextFiles = "";
+          for (const p of paths) {
+            const abs = safePath(p);
+            if (!abs) continue;
+            try {
+              const stat = await fs.stat(abs);
+              if (stat.isDirectory()) {
+                const files = await listDir(abs);
+                contextFiles += `\n### ${p}\nFiles: ${files.join(", ")}\n`;
+              } else {
+                const content = await fs.readFile(abs, "utf-8");
+                const preview = content.split("\n").slice(0, 200).join("\n");
+                contextFiles += `\n### ${p} (first 200 lines)\n\`\`\`typescript\n${preview}\n\`\`\`\n`;
+              }
+            } catch {
+              /* skip */
+            }
+          }
+          return {
+            description: `How ${feature} works in Claude Code`,
+            messages: [
+              {
+                role: "user" as const,
+                content: {
+                  type: "text" as const,
+                  text: `Explain how "${feature}" works in the Claude Code CLI.\n${contextFiles || "(No specific files mapped — use search_source and read_source_file to find relevant code.)"}`,
+                },
+              },
+            ],
+          };
+        }
+
+        case "compare_tools": {
+          const tool1 = args?.tool1;
+          const tool2 = args?.tool2;
+          if (!tool1 || !tool2)
+            throw new Error("Both tool1 and tool2 arguments are required");
+          const sources: string[] = [];
+          for (const toolName of [tool1, tool2]) {
+            const toolDir = safePath(`tools/${toolName}`);
+            if (!toolDir || !(await dirExists(toolDir))) {
+              sources.push(`// Tool not found: ${toolName}`);
+              continue;
+            }
+            const files = await listDir(toolDir);
+            const mainFile =
+              files.find(
+                (f) => f === `${toolName}.ts` || f === `${toolName}.tsx`
+              ) ?? files.find((f) => f.endsWith(".ts") || f.endsWith(".tsx"));
+            if (mainFile) {
+              const content = await fs.readFile(
+                path.join(toolDir, mainFile),
+                "utf-8"
+              );
+              sources.push(`// tools/${toolName}/${mainFile}\n${content}`);
+            } else {
+              sources.push(`// No main source found for ${toolName}`);
+            }
+          }
+          return {
+            description: `Comparison of ${tool1} vs ${tool2}`,
+            messages: [
+              {
+                role: "user" as const,
+                content: {
+                  type: "text" as const,
+                  text: `Compare these two Claude Code tools:\n\n## ${tool1}\n\`\`\`typescript\n${sources[0]}\n\`\`\`\n\n## ${tool2}\n\`\`\`typescript\n${sources[1]}\n\`\`\``,
+                },
+              },
+            ],
+          };
+        }
+
+        default:
+          throw new Error(`Unknown prompt: ${name}`);
+      }
+    }
+  );
+
+  return server;
+}
+
+/** Validate that SRC_ROOT exists. Exits with error if not. */
+export async function validateSrcRoot(): Promise<void> {
+  if (!(await dirExists(SRC_ROOT))) {
+    console.error(
+      `Error: Claude Code src/ directory not found at ${SRC_ROOT}`
+    );
+    console.error(
+      "Set CLAUDE_CODE_SRC_ROOT environment variable to the src/ directory path."
+    );
+    process.exit(1);
+  }
+}
+
+