Callimachus MCP server

Local index & search for your AI coding-agent threads — across 11 tools (Claude Code, Codex, Cursor, Gemini CLI, Qwen Code, Goose, OpenCode, Continue, Cline, Roo Code, Kilo Code) — plus a provider-agnostic chat, an MCP server, a CLI, and a VS Code / Cursor extension. Everything stays on your machine.

Named for Callimachus, who built the first catalogue of the Library of Alexandria.

Download

Grab the latest signed build from Releases — macOS (.dmg, Apple Silicon), Windows (.msi), or Linux (.AppImage / .deb). The app auto-updates from there on. Prefer to build it yourself? See Develop.

What it does

• Indexes every conversation from 11 coding agents into one local SQLite store — Claude Code, Codex, Cursor, Gemini CLI, Qwen Code, Goose, OpenCode, Continue, Cline, Roo Code, and Kilo Code. Adding another source is a small, documented contract.
• Searches them with hybrid ranking: keyword (SQLite FTS5 / BM25) fused with on-device semantic similarity (sqlite-vec KNN, no cloud) via Reciprocal Rank Fusion. Filter by source, project, subagents, starred, and tags.
• Finds code-aware — type file:embed/mod.rs in the search bar (or cal files ) to find every thread that touched a path; backed by a file-mention index built at index time.
• Distills knowledge — free heuristic TODO extraction, plus opt-in LLM distillation of decisions, gotchas, and summaries, with cross-thread semantic recall of past decisions/gotchas. Optional auto-distillation drains new/changed threads in the background so memory self-populates. Runs on local Ollama (keyless), your logged-in Claude Code or Codex CLI subscription (keyless, no API key), or a cloud API key.
• Curates the facts — pin, edit, or delete distilled facts so your edits survive re-distilling, plus an LLM "Review conflicts" pass that flags decisions that contradict each other.
• Remembers per project — a Projects tab aggregates each repo's decisions, gotchas, and open TODOs into durable memory (grouped by a canonical project key, so worktrees / symlinks / ~ don't split one repo), with an LLM brief and a managed .callimachus/memory.md. That memory is prepended when you "Open in CLI", and you can inject it into any agent automatically: Update AGENTS.md (or cal agents) writes a managed block into the repo's AGENTS.md / CLAUDE.md, and cal hook feeds it to a Claude Code SessionStart hook.
• Asks your history (RAG) — a synthesized, cited answer over your own threads, with [thread N] citations back to the sources it used. Needs an LLM engine (Knowledge/distillation enabled).
• Organizes into collections — star threads and attach free-form tags, then filter the list by starred or by tag.
• Chats with an in-app agent (Anthropic / OpenAI / Gemini / OpenRouter / Ollama — local or Cloud — or your logged-in Claude Code / Codex CLI with no key) that can search your own history and run shell commands with your approval; streaming, cancellable, with live model lists. Chats are saved

Shortened. The full README is on GitHub.