Code Declaration Lookup MCP server

This is a small helper that lets your AI search through a folder of code and find where functions, classes, and other named parts are defined. It is handy if you work with a large codebase and keep asking yourself where something lives. You do not need to be a programmer to set it up, but it is mostly useful for people who read or write code.

What this MCP server does

First you point this helper at a folder of code, and it builds a searchable index of the names inside. Then, when you ask your AI something like where a function is defined, the AI sends that question to this helper. The helper looks through its index and finds matching names. Your AI then tells you the file and the line where each match lives. If you add new code later, you can ask the AI to index that folder too.

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What you can do with it

• Find where a function or class is defined
• List all the code files that have been indexed
• See every function inside one specific file
• Search by part of a name, not just the full name
• Add a new folder of code to the index
• Check which APIs or code collections are already indexed

Try asking your AI

• “Where is the function called parse_config defined?”
• “List all the functions in src/utils.py”
• “Search for anything with user in the name”
• “Index the folder at /home/me/project/include”

What it gives back to you

You get back a list of matches. Each match shows the name, the kind of thing it is (like a function or a class), the file it is in, and the line number. Your AI can then summarize those results or point you to the exact spot. If nothing matches, it will tell you that too.

Before you start

Who it's for

Developers and anyone who reads code and wants quick answers about where things are defined.