Mason

Builds and maintains a persistent feature-to-file concept map so Claude doesn't re-explore your codebase every session. Exposes a Map-Reduce workflow through MCP tools: mason_init walks you through setup, generate_snapshot_batch processes files in chunks, and reduce_snapshot merges them into a unified catalog stored in .mason/snapshot.json. After init, get_snapshot returns instant feature lookups, get_impact traces change ripples through co-change history and references, and export_to_confluence syncs the map to wiki pages. Benchmarks show 36% average token savings on architecture questions. Designed for large codebases where architectural context gets rebuilt from scratch every conversation. Works across Cursor, Windsurf, and any MCP-compatible client.