Knowledge base CRUD, sync, and session-start hydration. Actions: "list" (browse entries), "read" (get entry content), "write" (create/update entry, auto git sync), "delete" (remove entry, auto git sync), "sync" (manual git pull + push), "wakeup" (return token-budgeted section-priority context bundle — identity, active_tasks, recent_decisions, known_gotchas, last_session_summary, top_weighted, semantic_fallback — call once at session start).

Search across sessions AND knowledge entries. Returns {mode, sessions, knowledge}. General mode (no scope): hybrid TF-IDF + semantic over both sources, with optional MMR diversity and category boost. Scoped mode (scope set): sessions-only filtered recall for a specific domain (errors, plans, configs, tools, files, decisions).

Session operations: list sessions, get a full conversation, or get a summary. Use action "list" to browse sessions, "get" to retrieve messages, "summary" for a quick overview.

Admin operations: view vector store stats, view/update configuration, rebuild embeddings, prune orphan session embeddings, or VACUUM the database. Use action "status" for index stats, "config" to view or update settings, "rebuild_embeddings" to re-embed all knowledge entries (useful when switching providers), "prune_orphans" to delete embeddings for sessions no longer present on disk, "vacuum" to reclaim free pages.

Knowledge graph operations with temporal validity and code structure support. Create/remove edges, traverse via directed BFS, bulk-import code graph edges. Relationship types: related_to, supersedes, depends_on, contradicts, specializes, part_of, alternative_to, builds_on, calls, imports, inherits. Code structure types (calls/imports/inherits) are created by knowledge-ingest and use "code:" prefixed node IDs.

Analysis tools: find duplicates, unconnected entries, most-connected concepts (god nodes), bridge entries, knowledge gaps, zero-result search queries, stale-by-code-activity entries, or generate a compact knowledge brief. Actions: consolidate, reflect, god_nodes, bridges, gaps, brief, search_gaps, stale_by_code_activity.