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Tessera

Your agent says done. Tessera checks.

Deterministic blast radius before every edit and verification after it, for any AI coding agent. Local, no LLM, Apache-2.0.
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Terminal session: tessera blast ranks the callers of formatName, tessera context shows findById with its callers and callees, and tessera verify catches two calls to functions that do not exist.
Before the edit, blast and context; your agent edits; after the edit, verify. Both read a local index.
Terminal window
npx tessera-codegraph blast <symbol>    # in any repository; the first query builds the index
claude mcp add tessera -- tessera mcp   # or any of 24 agents

Coding agents edit code they have only partly read. Tessera gives them an exact local map of the code, so they see who a change affects before they make it and find out what they broke before they say done. The map is built by tree-sitter and stored in SQLite: the same code always gives the same answer, and nothing leaves your machine.