CodeWikiTapGoogle CodeWiki, in your agent.

An unofficial, RAG-powered MCP server that streams Google CodeWiki documentation into your coding agent — chunked, cited, and grounded in the exact commit your dependency is pinned to.

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What is it?

GitHub

📚

Project-aware

At startup, scans your manifest (`package.json`, `pom.xml`, `Cargo.toml`, `go.mod`, …), resolves direct dependencies to GitHub repos, and probes CodeWiki for coverage — before the agent's first question.

🔎

Hybrid retrieval

BM25 (FTS5) + dense vectors (sqlite-vec) fused with Reciprocal Rank Fusion, then reranked with a cross-encoder. Five scores per chunk — ranking is auditable, not a black box.

🕸️

Knowledge graph

Five typed edge kinds extracted in the same SQLite transaction — `code_ref`, `diagram_edge`, `diagram_member`, `section_link`, `cross_repo_ref`. Ask "what's connected to this?"

🔗

Citation enforced

Every chunk and every page carries a byte-equal footer with the source URL and pinned commit SHA. Asserted in tests — there's no way to silence it.

🔒

Local-first

SQLite cache, ONNX inference, zero telemetry. No API keys. The only network traffic is to CodeWiki itself.

🧩

9 agents supported

Claude Code, Cursor, VS Code, Codex CLI, Gemini CLI, Qwen Code, opencode, Windsurf, Antigravity. One interactive wizard writes the right config block for each.

Quick install

bash

npx codewikitap install

Pick your agent, pick a scope, done. The wizard writes the config atomically with a .bak backup.

Why CodeWikiTap?

A typical CodeWiki page is 2,000–4,000 tokens. A real library has dozens of them — Next.js alone has 18 pages (~54 k tokens), React has 40+. Stuffing it all into the agent's context blows the budget before the first question is answered.

CodeWikiTap delivers focused, citation-bearing chunks (~5 × ~250 tokens ≈ 1.2 k tokens), 40–80× smaller than naive injection, with measurably higher recall.

Documentation

This site documents the public surface and the design. Continue with What is CodeWikiTap? for the conceptual model, or jump straight to Installation.

CodeWikiTap is an independent, unofficial project. It is not affiliated with, endorsed by, or sponsored by Google. The "CodeWiki" name is referenced descriptively as the upstream data source.

_{Developed by Burak Arslan}