Euthynos
Deterministic MCP server: what your change breaks, offline
What it does
AI coding agents are great at writing code, but they still struggle to understand how a change affects an existing codebase. Euthynos gives them structural intelligence: who calls a function, what a change reaches, which tests matter, where similar logic exists, and how functions connect. It runs locally, is read-only and deterministic, and works through MCP with Claude Code and other agents. Euthynos matched recall while using 13–31% fewer tokens on the fully measured tasks.
Your agent changes code faster than anyone can verify it. Euthynos gives it structural evidence about your repository — callers, blast radius, tests — and names the boundary of every answer. Local, read-only, Apache 2.0.
Your agent can change forty files in a minute. Nothing on your machine can tell it what those changes reach — so it reads, guesses, and sounds certain either way. Euthynos answers structurally, and names the boundary of every answer. A recording of real output, not a mock-up. Clone hono at 26de7313 , run the same command, and the numbers should match. Health 68 is not a grade to fix — it is five measured signals with their inputs named. Leverage 36 says most exported surface has few callers. Locality 88 says related changes already land together. These 382 files scan once; the index is content-addressed, so the next scan only re-reads what changed. An agent that can produce a refactor…from euthynos.dev
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