CodeWiki MCP — AI-generated docs for GitHub repos MCP Server

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📚 codewiki-mcp

MCP server for codewiki.google — search, fetch docs, and ask questions about any open-source repo

🇷🇺 Русский | 🇬🇧 English

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MCP server that connects any AI assistant to codewiki.google — AI-generated wiki documentation for open-source repositories.

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📖 Overview

codewiki-mcp is a Model Context Protocol server that gives AI assistants access to codewiki.google — a service that generates comprehensive wiki documentation for any GitHub repository. Search repos, fetch full docs, or ask natural-language questions — all through MCP.

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✨ Features

Feature	Description
🔍 Search Repos	Find repositories indexed by codewiki.google
📄 Fetch Wiki Docs	Get full markdown or structured pages for any repo
💬 Ask Questions	Natural-language Q&A with conversation history
🧠 NLP Repo Resolution	Type naturally — wink-nlp extracts keywords and resolves to owner/repo
📡 Multiple Transports	stdio (default), Streamable HTTP, SSE
🔄 Retry with Backoff	Automatic retries with exponential backoff on 5xx errors
🐳 Docker Support	Multi-stage Alpine build
📊 Response Metadata	Byte count and elapsed time on every response

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🚀 Quick Start

Using npx (no install)

npx -y codewiki-mcp@latest

From source

git clone https://github.com/izzzzzi/codewiki-mcp.git
cd codewiki-mcp
npm install
npm run build

Transports

# stdio (default)
node dist/cli.js

# Streamable HTTP
node dist/cli.js --http --port 3000

# SSE
node dist/cli.js --sse --port 3001

🐳 Docker

docker build -t codewiki-mcp .

# stdio
docker run -it --rm codewiki-mcp

# HTTP
docker run -p 3000:3000 codewiki-mcp --http

# with environment variables
docker run -p 3000:3000 \
  -e CODEWIKI_REQUEST_TIMEOUT=60000 \
  -e CODEWIKI_MAX_RETRIES=5 \
  -e GITHUB_TOKEN=ghp_your_token \
  codewiki-mcp --http

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🔧 MCP Client Configuration

<details> <summary><b>Cursor</b></summary>

Add to .cursor/mcp.json:

{
  "mcpServers": {
    "codewiki-mcp": {
      "command": "npx",
      "args": ["-y", "codewiki-mcp@latest"]
    }
  }
}

</details> <details> <summary><b>Claude Desktop</b></summary>

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "codewiki-mcp": {
      "command": "npx",
      "args": ["-y", "codewiki-mcp@latest"]
    }
  }
}

</details> <details> <summary><b>Claude Code</b></summary>

claude mcp add codewiki-mcp -- npx -y codewiki-mcp@latest

</details> <details> <summary><b>Windsurf</b></summary>

Add to your Windsurf MCP config:

{
  "mcpServers": {
    "codewiki-mcp": {
      "command": "npx",
      "args": ["-y", "codewiki-mcp@latest"]
    }
  }
}

</details> <details> <summary><b>VS Code (Copilot)</b></summary>

Add to .vscode/mcp.json:

{
  "servers": {
    "codewiki-mcp": {
      "command": "npx",
      "args": ["-y", "codewiki-mcp@latest"]
    }
  }
}

</details> <details> <summary><b>Local development</b></summary>

{
  "mcpServers": {
    "codewiki-mcp": {
      "command": "node",
      "args": ["/path/to/codewiki-mcp/dist/cli.js"]
    }
  }
}

</details>

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💡 Usage

Prompts you can use in any MCP-compatible client:

codewiki fetch how routing works in Next.js

codewiki search state management libraries

codewiki ask how does React fiber reconciler work?

Fetch complete documentation:

codewiki fetch vercel/next.js
codewiki fetch https://github.com/fastify/fastify

Get structured pages:

codewiki fetch pages tailwindlabs/tailwindcss

Ask with natural language:

codewiki ask fastify how to add authentication?

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🛠️ MCP Tools

🔍 codewiki_search_repos

Search repositories indexed by codewiki.google.

Parameter	Type	Required	Default	Description
query	string	✅	—	Search query
limit	number	—	10	Max results (1–50)

📄 codewiki_fetch_repo

Fetch generated wiki content for a repository.

Parameter	Type	Required	Default	Description
repo	string	✅	—	owner/repo, GitHub URL, or natural-language query
mode	string	—	"aggregate"	"aggregate" — full markdown; "pages" — structured JSON

💬 codewiki_ask_repo

Ask a natural-language question about a repository.

Parameter	Type	Required	Default	Description
repo	string	✅	—	Repository identifier (same formats as fetch)
question	string	✅	—	Question about the repo
history	array	—	[]	Conversation history [{role, content}] (max 20)

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📊 Response Format

<details> <summary><b>✅ Success — Search</b></summary>

{
  "query": "fastify",
  "count": 1,
  "items": [
    {
      "fullName": "fastify/fastify",
      "url": "https://github.com/fastify/fastify",
      "description": "Fast and low overhead web framework",
      "avatarUrl": "https://avatars.githubusercontent.com/u/24939....",
      "extraScore": 555
    }
  ],
  "meta": {
    "totalBytes": 12500,
    "totalElapsedMs": 450
  }
}

</details> <details> <summary><b>✅ Success — Fetch (pages mode)</b></summary>

{
  "repo": "fastify/fastify",
  "commit": "abc123",
  "canonicalUrl": "https://github.com/fastify/fastify",
  "pages": [
    {
      "title": "Overview",
      "level": 1,
      "anchor": "#overview",
      "markdown": "# Overview\n\nFastify is a web framework...",
      "diagramCount": 1
    }
  ],
  "meta": {
    "totalBytes": 25000,
    "totalElapsedMs": 1200
  }
}

</details> <details> <summary><b>✅ Success — Ask</b></summary>

{
  "answer": "Fastify uses a plugin-based architecture where...",
  "meta": {
    "totalBytes": 8500,
    "totalElapsedMs": 2300
  }
}

</details> <details> <summary><b>❌ Error Response</b></summary>

{
  "error": {
    "code": "RPC_FAIL",
    "message": "CodeWiki RPC VSX6ub failed with status 404",
    "rpcId": "VSX6ub",
    "statusCode": 404
  }
}

Error codes: VALIDATION, RPC_FAIL, TIMEOUT, NLP_RESOLVE_FAIL

</details>

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⚙️ How It Works

Data Flow

AI Assistant → MCP protocol → codewiki-mcp → HTTPS → codewiki.google
                                                            ↓
AI Assistant ← MCP protocol ← codewiki-mcp ← JSON  ← Google RPC API

Google Batchexecute RPC

codewiki.google uses Google's internal batchexecute RPC format (not REST, not GraphQL). The client:

1. Builds a POST request with f.req=... body
2. Sends it to /_/BoqAngularSdlcAgentsUi/data/batchexecute
3. Receives a response with XSSI prefix )]}'\n
4. Parses wrb.fr frames and extracts the typed payload

Each tool maps to an RPC ID:

Tool	RPC ID
🔍 Search	vyWDAf
📄 Fetch	VSX6ub
💬 Ask	EgIxfe

🧠 NLP Repo Resolution

Users can type natural language instead of owner/repo:

"the fastify web framework"
  → wink-nlp extracts keyword "fastify" (POS tag: NOUN/PROPN)
  → GitHub Search API: GET /search/repositories?q=fastify&sort=stars
  → top result: "fastify/fastify"
  → normalizeRepoInput("fastify/fastify") → URL for codewiki

🔄 Retry with Exponential Backoff

Attempt	Delay
0	immediate
1	250ms
2	500ms
3	1000ms

4xx errors (client errors) are never retried.

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🖥️ CLI

codewiki-mcp [options]

Options:
  --http           Streamable HTTP transport
  --sse            SSE transport
  --port <number>  Port for HTTP/SSE (default: 3000)
  --endpoint <str> URL endpoint (default: /mcp)
  --help, -h       Show help

---

⚡ Configuration

Environment variables:

Variable	Default	Description
CODEWIKI_BASE_URL	https://codewiki.google	Base URL
CODEWIKI_REQUEST_TIMEOUT	30000	Request timeout (ms)
CODEWIKI_MAX_RETRIES	3	Max retries
CODEWIKI_RETRY_DELAY	250	Base retry delay (ms)
GITHUB_TOKEN	—	GitHub token for NLP repo resolution

You can also create a .env file in the project root:

CODEWIKI_REQUEST_TIMEOUT=60000
CODEWIKI_MAX_RETRIES=5
GITHUB_TOKEN=ghp_your_token

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📁 Project Structure

src/
├── cli.ts                  # CLI entry point
├── server.ts               # Transport setup (stdio/HTTP/SSE)
├── index.ts                # Library re-exports
├── schemas.ts              # Zod input schemas
├── lib/
│   ├── codewikiClient.ts   # API client with retry + metadata
│   ├── batchexecute.ts     # Google RPC response parser
│   ├── repo.ts             # Repo normalization + NLP resolution
│   ├── extractKeyword.ts   # NLP keyword extraction (wink-nlp)
│   ├── resolveRepo.ts      # GitHub Search API resolver
│   ├── errors.ts           # CodeWikiError + formatMcpError
│   └── config.ts           # Env-based configuration
└── tools/
    ├── searchRepos.ts      # codewiki_search_repos
    ├── fetchRepo.ts        # codewiki_fetch_repo
    └── askRepo.ts          # codewiki_ask_repo

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❓ Troubleshooting

<details> <summary><b>Permission Denied</b></summary>

chmod +x ./node_modules/.bin/codewiki-mcp

</details> <details> <summary><b>Connection Refused (HTTP/SSE)</b></summary>

# Check if port is in use
lsof -i :3000

</details> <details> <summary><b>Timeout Errors</b></summary>

For large repositories, increase the timeout:

CODEWIKI_REQUEST_TIMEOUT=60000 node dist/cli.js

</details> <details> <summary><b>NLP Resolution Fails</b></summary>

If natural-language input doesn't resolve, use explicit format:

# Instead of "the fastify framework"
fastify/fastify
# or
https://github.com/fastify/fastify

Set GITHUB_TOKEN to avoid GitHub API rate limits for unauthenticated requests.

</details>

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🧑‍💻 Development

npm run dev          # stdio with tsx
npm run dev:http     # HTTP with tsx
npm run dev:sse      # SSE with tsx
npm run typecheck    # type check
npm run test         # run tests
npm run test:watch   # tests in watch mode
npm run build        # compile to dist/

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🤝 Contributing

Contributions are welcome! Please:

1. Fork the repository
2. Create a feature branch (git checkout -b feat/my-feature)
3. Use Conventional Commits for commit messages
4. Run npm run typecheck && npm run test before submitting
5. Open a Pull Request

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📄 License

MIT © codewiki-mcp contributors