Auditable memory (memory3l)

Local MCP server that gives an assistant an auditable, append-only fact ledger stored in SQLite, with verifiable invariants I1-I5.

What you can do

• Serve an append-only fact ledger from a local SQLite file so the assistant can recall stored facts.
• Optionally expose an append_facts tool to add new facts to the ledger, only when explicitly enabled.
• Support verification of the ledger's invariants I1-I5 for auditability.
• Point at a specific ledger file or a development checkout of the audit core via environment variables.

When to use it

Use it when you want an assistant to keep durable memory whose history is append-only and auditable, rather than a free-form notes store. Suitable for local, desktop-based workflows where the ledger file stays on your machine.

Requirements

Runs as a local stdio process, launched with uvx from the PyPI package memory3l-mcp, so Python tooling is needed. Set MEMORY3L_DB to the SQLite fact-ledger file to serve; MEMORY3L_ALLOW_WRITE=1 is required to expose the append_facts tool; MEMORY3L_ROOT optionally overrides the audit core location. No authentication is declared.