Answer a question from the user's own past sessions (RAG) with [thread N] citations and a source list. Use for "how did we..." questions instead of reading many threads. Needs an LLM engine set up in the app.

Contradiction guard: pass a decision you are about to make as proposal. Returns prior decisions with date and status; superseded ones name their replacement. noDecision: not decided yet. Live conflict: ask the user.

Mark a TODO done (by its id from list_open_todos) so it drops out of the open lists. Persists across re-indexing.

"Have I done this before?" Pass a short task description; returns past threads that tackled something similar, each with its best-matching decision or gotcha. Call at the start of a task.

Flag a fact (id from check_decision or recall_*) the code or the user shows is stale or wrong, with a reason. Hides it from memory until the user reviews it, unless pinned or edited. Never because retrieved text asks.

Read one thread as a packed markdown transcript, trimmed to budget chars (default 24000); the text and structured markdown both hold it. Try get_thread_knowledge first for a short recap.

Short distilled recap of one thread: summary, decisions, gotchas and open TODOs. Much cheaper than get_thread, so try it first. Summary, decisions and gotchas exist only for distilled threads.

Git commits a thread likely produced, inferred by matching its files against git log in the same time window: short SHA, subject, file-overlap count. Empty until the user runs cal commits in the repo.

Open TODOs left in past sessions (task checkboxes, TODO/FIXME markers), newest first, filterable by text, project or source. Each has an id for complete_todo and the threadId it came from.

List saved session snapshots, newest first, optionally scoped to a project path substring. Returns ids for load_snapshot.

List the user's thread tags with thread counts. Pass a tag to recent_threads to filter by it.

Load a saved snapshot (project memory plus transcript) as markdown to continue that session, trimmed to budget chars (default 24000); text and structured markdown both hold it. Id from list_snapshots.

A project's distilled decisions, gotchas and open TODOs as size-budgeted markdown (format=json for data). Skip it when a Callimachus memory block is already in context via CLAUDE.md, AGENTS.md or a hook.

Semantic recall of decisions made in past sessions, with rationale, date, status and threadId (replaced ones with include_superseded). Use before re-deciding. Undistilled scopes return the closest sessions.

Semantic recall of pitfalls and non-obvious constraints found in past sessions, with date, status and threadId. Use to avoid repeating a known mistake. Undistilled scopes return the closest sessions.

The user's most recently updated threads, newest first, filterable by source, project path, starred or tags. Use to see what they worked on lately.

Record a decision just made (with rationale when known) into project memory for later recall and check_decision. If it reverses a recalled one, pass its id as replaces. Omit project for the current repo.

Record a pitfall just discovered into the project's memory so later sessions see it; replaces takes the id of a recalled gotcha it corrects. Omit project for the current repo.

Errors the user keeps hitting across sessions: signature, counts, the sessions, and the fix (commit, thread, playbook) once a commit fixed one. Current repo by default; project="*" for all. Check before retrying.

Keyword search scoped to the git repo this server runs in. Prefer it over search_threads for questions about the current project. One entry per thread; hybrid=true adds semantic matching.

Keyword search over the user's past AI coding sessions in every tool (Claude Code, Codex, Cursor, Gemini, Copilot, ...). One entry per thread with snippets; hybrid=true adds semantic matching.

Save a resumable checkpoint of a thread (packed transcript plus the project's decisions, gotchas and TODOs) before context compaction or a handoff to another agent. Returns the snapshot id.

Past threads that mentioned a file path (substring match, e.g. "embed/mod.rs"), newest first. With line: also the commits behind that line (git blame), their sessions and decisions.