Report the local Yggdrasil memory engine's health: running status, total stored-memory count, and whether semantic (dense-vector) search is available. Call this first when any other ygg_* tool fails unexpectedly, to confirm the engine is up before retrying. Returns a small JSON status object.

Search durable memory ACROSS ALL projects for prior solutions, decisions, and lessons to reuse. Use BEFORE solving any non-trivial problem ("have I handled this before?"); for one known project use ygg_bootstrap to load its context or ygg_search for a targeted query instead. Ranks by relevance and past usage — lexical by default, semantic when embeddings are enabled.

Load the top durable memories for ONE project — decisions, conventions, lessons, and open status — to prime work at the start of a task. Use when you already know the project; for cross-project discovery use ygg_recall, for a targeted in-project query use ygg_search. Results are project-scoped and ranked, most-used and pinned first.

Search ONE project's durable memory with a free-text query and optional type filter — the precise, in-project lookup. Use when you know the project and want specific matches (e.g. every 'fix' about auth); for cross-project discovery use ygg_recall, to load a project's whole context use ygg_bootstrap. Lexical BM25 plus semantic ranking when embeddings are enabled.

Persist ONE atomic, reusable fact (a decision, lesson, fix, convention, or status) to a project's durable memory for future sessions. Call right after you decide something, learn a lesson, or fix a non-obvious bug; store one idea per call, phrased to stand alone. Near-duplicates are merged automatically and obvious secrets (API keys, tokens) are refused. Returns the saved memory id.

Write ONE stored memory to a human-readable Markdown note (Obsidian-compatible) on disk; the stored memory itself is unchanged. Use when the user wants to read, edit, or archive a specific memory as a file. Needs the memory id from a prior ygg_recall / ygg_search / ygg_bootstrap result plus its project; returns the written file path.