tai-mcp-github

A minimal MCP (Model Context Protocol) server that exposes a focused set of GitHub PR review tools to AI agents.

Why

The official github/github-mcp-server exposes 60+ tools (Actions, Discussions, Dependabot, secret scanning, gists, etc.). This inflates the MCP schema sent to the LLM on every request, increasing token usage and noise. This server limits the surface to exactly what is needed for a PR review workflow — nothing more.

Tools

Tool	Description
list_pull_requests	List open (or closed/all) PRs for a repository
get_pull_request	Get full details of a specific PR
list_pr_comments	List general thread comments on a PR (conversation tab)
list_unresolved_review_threads	List unresolved inline review threads (diff comments)
resolve_review_thread	Mark an inline review thread as resolved

Requirements

• Python 3.12+
• uv
• A GitHub Personal Access Token with Pull requests: Read (and Write if you want to resolve threads)

Setup

git clone <repo-url>
cd tai-mcp-github

cp .env.example .env
# Edit .env and set GITHUB_TOKEN=your_pat_here

Usage

Run the server

uv run server.py

Use with Claude Code

Add to your MCP configuration (e.g. ~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "github-pr-review": {
      "command": "uv",
      "args": ["run", "server.py"],
      "cwd": "/path/to/tai-mcp-github"
    }
  }
}

Development

Run tests

uv run --with pytest --with pytest-asyncio pytest tests/ -v

Lint and type-check

uv run --with ruff ruff check .
uv run --with ruff ruff format --check .
uv run --with mypy mypy server.py

Git hooks

Pre-commit (ruff + mypy) and pre-push (tests) hooks are provided. Install them once:

cp .git/hooks/pre-commit .git/hooks/pre-commit  # already in place after clone

Note: git hooks are local only. Run the script below on a fresh clone to activate them.

chmod +x .git/hooks/pre-commit .git/hooks/pre-push

Tech stack

• fastmcp — MCP server framework
• PyGithub — GitHub REST API client
• httpx — HTTP client used for GitHub GraphQL API calls
• python-dotenv — .env file support
• ruff — linting and formatting
• mypy — static type checking
• pytest — testing

Architecture

server.py          # Single-file MCP server — all tools live here
tests/
└── test_server.py # Unit tests (fully mocked, no GitHub calls)

The server is intentionally stateless — no caching, sessions, or background tasks. Each tool maps directly to one GitHub API call:

• PR listing and detail use the GitHub REST API via PyGithub
• Review thread listing and resolving use the GitHub GraphQL API via a single httpx POST (the GraphQL resolveReviewThread mutation is not available on the REST API)

Authentication is via a GitHub Personal Access Token passed through the GITHUB_TOKEN environment variable. No OAuth or GitHub App flows are needed.

Scope

This server is read-focused. Explicitly out of scope:

• Git operations (commits, pushes, branch management) — do these locally
• Any GitHub feature outside the PR review workflow (Actions, Issues, Releases, etc.)