Perseus Vault (Formerly Mimir/Mneme), Persistent Memory Engine For AI Agents MCP Server

Local-first MCP memory server: SQLite, FTS5 and vector search, AES-256-GCM. 49 tools, no cloud.

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What is the Perseus Vault (Formerly Mimir/Mneme), Persistent Memory Engine For AI Agents MCP Server?

Local-first MCP memory server: SQLite, FTS5 and vector search, AES-256-GCM. 49 tools, no cloud.

The short version

Give your agents memory that survives the session, so they stop re-deriving what they already learned and stop repeating past mistakes. Hybrid recall (BM25 + dense + RRF), bi-temporal history, and AES-256-GCM at rest, exposed as 65 canonical MCP tools that work with any host. Legacy mimir_* and mneme_* aliases remain callable but are not counted separately. 73.8% on LongMemEval's official harness (vs Zep 63.8%, Mem0 49.0%). One binary. One file. No Docker. No Postgres. No cloud. Local-first, air-gap ready, MIT.

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Maintainer setup documentation.

Example prompts to try

  • “Use Perseus Vault (Formerly Mimir/Mneme), Persistent Memory Engine For AI Agents to Graph.”
  • “Use Perseus Vault (Formerly Mimir/Mneme), Persistent Memory Engine For AI Agents to Journal.”
  • “Use Perseus Vault (Formerly Mimir/Mneme), Persistent Memory Engine For AI Agents to State.”

Frequently asked questions

Local-first MCP memory server: SQLite, FTS5 and vector search, AES-256-GCM. 49 tools, no cloud. Confirm the tools offered by your installed version in the connected client. Tool availability and permissions depend on the server and account configuration.