Ast MCP Server

MCP server that uses TypeScript AST to find which tests are affected by a code change. Exposed over MCP by the ast mcp server, that capability becomes something an assistant can invoke while it works, not something you go and do afterwards.

What it actually does

ast-impact-mapper-mcp is an advanced Model Context Protocol (MCP) server that analyzes your TypeScript/JavaScript codebase using AST parsing (ts-morph) and dependency graph tracing. It helps AI agents (like Claude or Cursor) target only the relevant tests, find dead code, identify circular import dependencies, and trace API mutations.

Adding it to your client

The server ships on npm as vitest, so your MCP client can launch it on demand — there is no separate build step. Add the server block to your client's configuration, restart it, and the tools register themselves.

When to reach for it

This sits in the developer tooling group, where several servers overlap in what they claim to do but differ sharply once you actually set them up. It is maintained by vola-trebla; worth a glance at recent repository activity before you build anything load-bearing on it.

We check each listing at SyncDev against the project's documentation before it goes live — if something here drifts out of date, it is a bug worth reporting.

Caveats

• It runs with your machine's permissions. That is convenient and also the reason to think about what you point it at before you approve a tool call.
• MCP clients confirm each tool call by default. Leave that on until you have watched what the ast mcp server does with a few real requests.