v0.6.0

What's New

Native Vector Storage (sqlite-vec)

• Integrated sqlite-vec for native KNN vector search
  • VectorIndex class with vec0 virtual table for cosine similarity search
  • Dual-write: embeddings stored in both JSON column and vec0 index
  • claude-memory index --vec flag for backfilling existing embeddings into vec0
  • Fast path in Recall uses sqlite-vec KNN when available, falls back to JSON + Ruby
  • Sweeper cleans up vec0 entries for superseded/expired facts
  • Doctor and MCP status/stats report vec0 availability and coverage
  • Cross-platform support with platform-specific gem installation

Database Maintenance

• compact command for database maintenance (VACUUM + integrity check)
• export command for fact backup and migration to JSON

Hook Enhancements

• SessionStart context injection via hookSpecificOutput.additionalContext
  • Injects recent facts and project context at session start
• Tool-specific observation compression for reduced token usage
• --async flag for non-blocking hook execution
• Hook error classification for graceful degradation
• Conversation exclusion markers for session-level opt-out

MCP Discovery

• memory.list_projects MCP tool for discovering all project databases

Developer Experience

• Dynamic MCP server instructions with progressive disclosure documentation
• Comparative benchmark suite with QMD and grepai adapters

Bug Fixes

• Recall returned no results: DualQueryTemplate accessed stores before initializing them, causing all recall queries to silently return empty results. Refactored to use existing store_for_scope method.
• Doctor crashed on sqlite-vec tables: SchemaValidator iterated all tables including vec0 virtual tables, which require the sqlite-vec extension. Now skips facts_vec* tables using prefix match.
• Forward-migrated databases: Older gem versions now gracefully handle databases migrated by newer versions instead of crashing.
• Hybrid retrieval ordering: Preserved BM25 scores and RRF ordering in hybrid search results instead of re-sorting by source/time.

Stats

• 21 MCP tools, 22 CLI commands
• 1316 test examples, 0 failures
• Full changelog: CHANGELOG.md