github-code-rag-mcp
MCP server for GitHub code retrieval and reuse, using SQLite+FTS5 indexing and search history to enable search-first, requirements-refined code search from GitHub repositories.
README
github-code-rag-mcp
GitHub Code RAG built on MCP protocol. System prompt optimizes AI's questioning workflow (search-first, requirements refinement step-by-step), with SQLite + FTS5 storing code indexes and search history, enabling a complete pipeline from GitHub retrieval to code reuse. Zero external dependencies.
基于 MCP 协议的 GitHub Code RAG 工具。通过系统提示词优化 AI 提问流程(先搜再问、逐步确认需求),SQLite + FTS5 存储代码索引与搜索历史,实现从 GitHub 检索到代码复用的完整链路。零外部依赖。
项目结构 / Project Structure
├── server/
│ └── mcp_server.py # MCP 服务器入口,定义所有工具
├── github/
│ └── connector.py # GitHub REST API 封装(纯 urllib)
├── core/
│ ├── models.py # 数据模型(dataclass)
│ └── retrieval_engine.py # FTS5 搜索引擎
├── storage/
│ └── sqlite_storage.py # SQLite 持久化(FTS5 + WAL 模式)
├── tests/
│ ├── test_retrieval.py
│ └── test_storage.py
├── .well-known/
│ └── mcp.json # MCP 注册配置
├── pyproject.toml # 项目配置与入口
└── requirements.txt
工具列表 / Tools
| 工具 / Tool | 说明 / Description |
|---|---|
search_github |
搜索 GitHub 仓库 / Search GitHub repos |
web_search_github |
Bing 搜索 GitHub(API 限流替代)/ Search via Bing (free fallback) |
search_history |
查询搜索历史 / Query search history |
search_code |
FTS5 全文搜索已读代码 / FTS5 search across indexed code |
list_github_files |
浏览仓库目录 / List repo files |
read_github_file |
读取文件并自动索引 / Read file & auto-index |
index_status |
查看索引状态 / View index status |
db_inspect |
查看数据库结构 / Inspect database schema |
db_cleanup |
清理历史数据 / Cleanup historical data |
快速开始 / Quick Start
# 安装依赖 / Install dependencies
uv sync
# 配置 GitHub Token(可选,不配限 60 次/时)
# Optional — without it: 60 requests/hour
export GITHUB_TOKEN=ghp_xxx
# 运行(stdio 模式)/ Run (stdio mode)
uv run github-code-rag
测试 / Testing
uv run pytest
技术特点 / Technical Highlights
- 零外部依赖 / Zero external deps:仅
mcp>=1.0 - 零 Embedding / No embeddings:纯 FTS5 trigram 全文搜索,无需向量数据库 / Pure FTS5 trigram search, no vector DB
- 零 git clone / No git clone:通过 GitHub REST API 直接读取文件 / Read files directly via GitHub REST API
- 内置 Bing 搜索作为 GitHub API 限流时的免费替代 / Built-in Bing fallback when GitHub API rate limit is hit
- 自动记录搜索历史,支持增量检索 / Auto-track search history with incremental retrieval
- 提供数据库管理和清理工具 / Built-in DB management and cleanup tools
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