Mason – the context builder for LLMs 👷
A persistent concept map for your AI coding assistant — so it stops re-exploring your codebase every session.
Up to 67% fewer tokens on architecture questions · same answer quality · MCP-only
claude mcp add mason --scope user -- npx -p mason-context mason-mcpRestart Claude Code, then ask: "use mason to set up this project." The assistant calls mason_init, walks you through a quick Q&A to build the concept map, and you're done.
Next session, your assistant loads the map instead of grepping 8 files to figure out what your app does.
0.4.0 note: Mason is MCP-only as of v0.4.0. The previous
mason <command>CLI has been removed — everything runs through MCP tools, driven by your assistant. See 0.4.0 migration below if you used the old CLI.
The pain
Every new conversation about your code, your assistant starts from zero. It greps for auth, reads three files, greps for user, reads three more, pieces together the architecture, then finally answers. Tomorrow you ask a different question — same dance. The understanding it built yesterday is gone.






