xmp4 — Semantic code knowledge for your stack

Connects to a hosted SCIP index of 856 popular open source libraries across C#, Java, TypeScript, Python, Rust, and PHP. Exposes 17 semantic code navigation tools including symbol search, call hierarchies, precise callers and callees, type inheritance, and source extraction. Runs over streamable HTTP with no local clone required. The benchmark claims 42x fewer tokens than file-based approaches for the same question because it returns compiler-resolved symbols instead of grep output. Useful when your agent repeatedly clones Flask or Tokio to answer shallow questions about method signatures or call sites. Adds libraries by demand based on aggregate query logs and explicit requests.