Codna — repository intelligence MCP server

Codna

<!-- mcp-name: io.github.thyn-ai/codna -->

Understand. Fix. Evolve.

Agents read your code. Codna understands it.

Codna maps a repository before it spends a token. It then reviews pull requests, fixes bugs and proves which scanner findings are reachable. The same codna command runs on your machine, in the GitHub Action and behind the GitHub App.

Runs on your machine or your cloud. Your code never leaves without your key.

Install

pip install codna          # or: pipx install codna · uv tool install codna
codna --version

Python 3.12–3.13. Wheels for macOS on Apple silicon and Linux x86_64. git on your PATH. Nothing else to install: no Node, Bun, Docker or server. The agent runtime ships inside the wheel.

Local commands need no Codna key. fix and review use your own model provider key, stored in the OS keychain and never printed:

codna key set anthropic    # also: openai, gemini, google, groq, mistral, openrouter, xai, cursor

Commands

codna triage . --issue "checkout total is wrong"     # suspect files. Deterministic. 0 LLM tokens.
codna review . --pr 123 --post                        # findings with a verdict on the pull request
codna fix . --tests --apply --max-iterations 3        # patch, re-run your tests, re-fix until green
codna fix <git url> --ref <sha> --issue "…" --open-pr # push a branch and open a pull request
codna secure . --from-sarif results.sarif             # which scanner findings are reachable. 0 LLM tokens.

codna fix prints the root cause, the impacted symbols, the blast radius, its confidence and a regression risk. --open-pr needs a git URL and a GitHub write token. codna review posts one inline comment per finding with severity, category and a suggestion block, and an Approve when the diff is clean at medium and high. codna secure reads SARIF 2.1.0 from CodeQL, Semgrep, Snyk, Trivy or any other scanner.

Other commands: init, status, doctor, login, key, impact, memory export, report. Full reference: docs.codna.ai/reference/cli.

MCP server

Run Codna as a Model Context Protocol server over stdio — the same engine the CLI uses, inside Cursor, Claude Desktop, or your own agent:

pipx install "codna[mcp]"       # or: pip install "codna[mcp]"
codna mcp                       # serve over stdio
codna mcp install --client cursor     # optional: write the client config for you (or --client claude)

Five tools, each returning JSON; a failure comes back as codna_ error: … text and never crashes the server:

3 of 5 tools need no key at all — codnatriage, codnasecure and codna_recall run with zero credentials and zero network calls. Full reference: docs.codna.ai/guides/mcp.

Code memory

Code memory and recall run on your machine with no login and no extra install. The optional codna[memory] extra adds the on-device semantic reranker; without it, recall ranks lexically.

What leaves your machine

Shortened. The full README is on GitHub.