Summary
What the assistant learned last week is still there next week, and is still correctable.
Facts attach to entities and entities connect to each other, so a detail about a person or a project is stored once and found from either end rather than restated in every prompt. The delete tools are the part that matters over time: delete_observations removes one wrong statement without taking down the entity it was attached to, so the graph can be corrected rather than rebuilt.
What it is
A knowledge-graph memory backed by DuckDB: eight tools that create entities and relations, attach observations to entities, search and open nodes, and delete any of the three.
What you get
- Entities created several at a time
- Relations between entities, written in active voice
- Observations added in batches to entities that already exist
- Search across nodes by query, and opening named nodes directly
- Granular deletion: whole entities together with their relations, individual observations, or individual relations
Requirements
Npx on your PATH and a writable path in MEMORY_FILE_PATH for the store. No account, no key.
Setup effort
One command — npx -y @izumisy/mcp-duckdb-memory-server