Show HN: Friday – Self-hosted persistent memory for AI coding agents (MCP)

Friday is an open-source, self-hosted solution that provides persistent cognitive memory for AI coding assistants. Unlike other AI coding tools like Cursor, Claude, and Copilot, which suffer from a lack of persistent memory, Friday ensures that all relevant context is retained across sessions. This means that your AI agents can provide deeply personalized, project-specific insights instead of generic advice, potentially saving up to 40% of your time spent rebuilding context.

Friday connects to your existing AI tools through the Model Context Protocol (MCP) and runs fully self-hosted on your own infrastructure. This ensures that your data remains secure and never leaves your machine or server. Setting up Friday is simple, requiring only Docker and Docker Compose to be installed. No additional Python setup or database configuration is needed.

Once installed, Friday can be integrated with any AI coding assistant by simply adding the appropriate configuration file for your client. For example, to add Friday to your Antigravity global MCP configuration, you would edit the ~/.gemini/config/mcp_config.json file and set the FRIDAY_URL to point to your self-hosted Friday instance. If your Friday server is running remotely, you would need to change the FRIDAY_URL to the appropriate IP address and port.

Friday's memory storage system automatically analyzes stored facts with an LLM (DeepSeek Flash) to extract entities and relationships, which are then wired into a Neo4j knowledge graph. This is done without any manual input, and the graph view is built with the same engine that powers Obsidian's graph view. Old versions of memories are preserved with immutable version history, providing a full audit trail of changes.

To enhance the efficiency of memory retrieval, Friday uses ChromaDB vector search to identify the most relevant context for each query. This means that your AI agents will only call Friday's tools for the most pertinent information, rather than having to sift through large amounts of data. Authentication is handled through the X-Brain-Key header for all authenticated endpoints.

Friday is built and maintained by the open-source community, and contributions are encouraged. The project's codebase is available on GitHub, where you can find guidelines for contributing and report any issues you encounter. The project is released under the MIT license and was built for the AI-native developer generation. By using Friday, you can help ensure that your AI coding agents never experience amnesia.