Search the personal knowledge base with hybrid retrieval (vector similarity fused with BM25 keyword matching). Behavior: returns up to k ranked excerpts, each with file path, heading breadcrumb and similarity score; no LLM call is made. Usage: reach for this when you need source material to quote, verify a claim, or see what exists on a topic; use brain_ask when you want a synthesized answer instead. Results are limited to the indexed sources — run brain_ingest first if recent files are missing.

Ask the knowledge base a question. Behavior: retrieves the most relevant excerpts, then an LLM synthesizes an answer grounded ONLY in them, ending with [source: path > section] citations. Usage: prefer this over brain_search whenever a question needs synthesis or an explanation; set verify=true to get a claim-by-claim audit (supported / partial / unsupported) when accuracy matters more than speed.

Show the Obsidian-style [[wikilink]] graph around a note. Behavior: lists every note the given note links to (outbound) and every note that links back to it (inbound), based on the current index. Usage: use to explore how a topic connects to others before asking questions, or to find related notes when search keywords fail.

Report what the index currently contains. Behavior: returns the store path, total chunk count, chunk count per source file, the embedding and chat models in use, and retrieval settings (hybrid, rrf_k, top_k). Reads local metadata only — no LLM or embedding calls. Usage: call before searching to see what is indexed, after brain_ingest to confirm what changed, or whenever answers seem to be missing a file you expected to be there. Takes no parameters.

Store a durable memory (decision, fact, preference, lesson learned) into the shared knowledge base. Behavior: writes a markdown note with frontmatter tags into the memories directory and indexes it immediately, so it is searchable within the same call. Memories persist across sessions and are shared by every MCP host that mounts loci — write from one IDE, recall from any other with brain_search or brain_ask. Usage: use for decisions, facts, preferences and lessons worth recording; do not use for ephemeral chit-chat.

Retract memories that are wrong or outdated. Behavior: memory notes matching the query move to a .trash folder (recoverable by hand) and their chunks leave the index immediately; nothing is permanently destroyed. Usage: use when a remembered fact was superseded or was a mistake; check with brain_search first if you are unsure what matches.

Incrementally (re)index the configured source directories. Safe to call repeatedly; only changed files are re-embedded.