Friday has been released as an open-source, self-hosted persistent cognitive memory layer designed specifically for AI coding agents. The tool addresses a common limitation in AI assistants—such as Cursor, Claude, and GitHub Copilot—where session resets lead to a loss of project context and architectural knowledge.
Friday: An Open-Source, Self-Hosted Persistent Memory Layer for AI Coding Agents
By utilizing the Model Context Protocol (MCP), Friday connects to existing AI tools to provide a unified memory backbone. It operates on the user's own infrastructure, ensuring that sensitive data remains private. The system uses a multi-layered architecture involving Mem0 for semantic memory, ChromaDB for vector search, and Neo4j for knowledge graph management. This allows the tool to automatically extract entities and relationships from chat history to build a visual knowledge graph of the codebase.
Key features include semantic search to reduce token usage, a versioned ledger for storing discrete facts, and a visual explorer for browsing the AI's knowledge. Developers can deploy the service using Docker, integrating it into their workflows through MCP stdio transport or direct HTTP REST APIs.
Sources
- Show HN: Friday – Self-hosted persistent memory for AI coding agents (MCP) （Hacker News Frontpage, 2026-09-16）