ARNO MCP server

ARNO is a helper that gives your AI a proper toolkit for working with code, instead of it poking around with raw text commands. It is made for people who use a coding assistant and want it to understand the project properly. If you work in a codebase and your AI keeps guessing, this is for you.

What this MCP server does

You ask your AI something about your code, like where a function lives or who uses it. The AI passes that request to ARNO, which reads the project the way a code editor would, by names and structure rather than by searching text. When you ask for a change, ARNO makes it and brings back any errors the compiler noticed, so the AI can fix them right away. It can also run your project's own build and test commands and show you the result. If something goes wrong, you can go back to a saved checkpoint.

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What you can do with it

• Find where a function, class, or variable is defined
• See every place that uses a piece of code
• Rename something across all the files at once
• Make a change and get the compiler's errors back immediately
• Run the tests that matter to the change
• Save a checkpoint before a risky change and revert if needed
• See a summary of what changed

Try asking your AI

• “Where is the parseConfig function declared, and who calls it?”
• “Rename the method validateInput to checkInput everywhere it is used.”
• “Change this function's signature and update all the callers, then check it still builds.”
• “Run the tests for the parser file and tell me what failed.”

What it gives back to you

You get answers in the chat in plain language: where something is, a list of callers, the compiler errors from an edit, or the test results. If ARNO made changes, it tells you what it changed. You can also ask for a summary of everything that is different since a checkpoint.

Before you start

Who it's for

Developers and anyone who uses an AI coding assistant on a real project and wants it to understand the code properly instead of guessing.