hSUM gives coding agents cited answers from the repository they are working in. It builds a local, project-scoped lexical index and returns exact or BM25-ranked passages with stable hsum:// citations through MCP. No embeddings, hosted corpus, account, model, daemon, or telemetry. Install it once, authorize repositories as you work, and let agents call four read-only evidence tools. It works offline after the build and coexists with claude-mem and company-brain tools.
