Stash is an open-source service that adds continuous memory to any AI model by storing and organizing session data in PostgreSQL with pgvector. It transforms raw conversations into structured facts, relationships, and patterns, so agents recall preferences, avoid repeated errors, and track long-term goals. Integration via MCP makes it model-agnostic, self-hostable, and free of vendor lock-in.

• Stash gives AI persistent memory by storing conversations in PostgreSQL/pgvector and running a 9-stage pipeline that turns raw episodes into facts, relationships, causal links, patterns, contradictions, goals, and failure detection
• Unlike RAG's static document search, Stash learns automatically from conversations and outcomes without manual tagging, improving over time
• It's model-agnostic and vendor-lock-in-free via MCP integration, working with Claude, GPT, or local models
• Setup requires just three commands (clone repo, configure .env, docker compose up), with self-hosting keeping data local