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Euthynos
Deterministic MCP server: what your change breaks, offline
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.
Hey Product Hunt 👋
I'm Tonil — a solo developer building Euthynos, an open-source code intelligence engine for AI coding agents.
I got tired of asking my agent:
“What breaks if I change this function?”
It would read a few files, give me a confident answer, and sometimes give me a different answer the next time.
So I built something that doesn't guess.
What Euthynos can answer
Who calls this function?
What does this change affect?
Which tests are relevant?
Where does similar logic already exist?
What's the shortest path between two functions?
Instead of asking an LLM to figure out repository structure from scratch, Euthynos builds that structural understanding locally and exposes it to your coding agent through MCP.
Why I built it this way
Deterministic — no LLM calls for the analysis.
Local — the query path works without an account, API key, or network connection.
Read-only — Euthynos analyzes your repository; it doesn't modify it.
Honest — when static analysis can't know something, it tells you.
For example, a blast-radius result can explicitly say:
“lower bound — dynamic dispatch is invisible to static analysis”
I'd rather give you an honest lower bound than a confident wrong answer.
The research
I preregistered a benchmark with sealed splits and blind hand-grading.
On the 3 fully measured tasks, Euthynos achieved the same recall while using 13–31% fewer tokens.
Two tasks went unmeasured and 21 of 42 sessions were invalid. I published those limitations too.
That's the standard I want Euthynos to follow: publish what worked, publish what didn't, and don't turn an experiment into a marketing number.
Try it
npm install -g euthynos
claude mcp add euthynos -- euthynos mcp
23 MCP tools · 16 languages · Apache-2.0
Works with Claude Code, Cursor, and other MCP clients.
🌐 euthynos.dev
I'd love to hear from other developers:
What's the one question you wish your AI coding agent could reliably answer about your codebase?
About Euthynos on Product Hunt
“Deterministic MCP server: what your change breaks, offline”
Euthynos was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #158 on the daily leaderboard. 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.
On the analytics side, Euthynos competes within Open Source, Developer Tools, Artificial Intelligence and GitHub — topics that collectively have 1.1M followers on Product Hunt. The dashboard above tracks how Euthynos performed against the three products that launched closest to it on the same day.
Who hunted Euthynos?
Euthynos was hunted by Tonil Kumar Vellaichami. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Euthynos including community comment highlights and product details, visit the product overview.
Tonil Kumar Vellaichami