MCP AST Explorer

Name: MCP AST Explorer
Author: LovRanRan

by LovRanRanversion 0.1.0i★ –iRuns on your computer

Registry nameio.github.LovRanRan/mcp-ast-explorer

Install

Overview

Description from the maker (original English)

Python symbol exploration for codebase onboarding agents.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Developer tools

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

PyPIPython’s uv installed (for the uvx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "ast-explorer": {
      "command": "uvx",
      "args": [
        "mcp-ast-explorer"
      ]
    }
  }
}

Run this in your terminal

claude mcp add ast-explorer -- uvx mcp-ast-explorer

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "ast-explorer": {
      "command": "uvx",
      "args": [
        "mcp-ast-explorer"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "ast-explorer": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "mcp-ast-explorer"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account LovRanRan, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Developer toolsi

More stars than 0% of the other 1396 servers in this category
Published to the registry more recently than 23% of the other 1396 servers in this category
Basic checks equal to or better than 100% of the other 1396 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is MCP AST Explorer safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.0) reached the registry 6 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

In the same category: GitHub, Desktop Commander, Cloudflare MCP

Alternatives

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

mcp-ast-explorer

MCP server for deterministic Python codebase symbol exploration.

mcp-ast-explorer indexes Python source files with LibCST and exposes focused MCP tools for codebase onboarding: definition lookup, function signatures, local references, direct call chains, and simple class hierarchy queries.

Codebase Onboarding Stack

mcp-ast-explorer is the semantic symbol layer in a three-server MCP tool stack for Project 6 wayfinder, a codebase onboarding agent.

mcp-repo-mapper maps repository structure, languages, entry points, framework evidence, and Python dependency edges.
mcp-ast-explorer provides symbol-grounded Python definition, signature, reference, call-chain, and class-hierarchy lookups.
mcp-test-runner runs local pytest/Jest checks and coverage summaries so agent claims can be verified against execution.

In wayfinder, this server feeds entry-point and symbol explanation while refusing to invent missing symbols.

Status

This is a Python-only v1. TypeScript is registered as an unsupported backend placeholder so the server has an explicit extension point, but TypeScript analysis is not implemented yet.

The server does not use an LLM for symbol lookup. If a requested symbol or class is not present in the parsed index, tools return a structured not-found result instead of inventing an answer.

Tools

Tool	Purpose
`health()`	Returns `ok` for smoke checks.
`find_definition(path, symbol, language="python")`	Finds a module, class, function, or method definition.
`function_signature(path, symbol, language="python")`	Returns the signature for a function or method symbol.
`find_references(path, symbol, language="python")`	Returns same-module CST name references for an existing symbol.
`call_chain(path, from_symbol, depth=2, language="python")`	Returns direct callers detected from local references.
`class_hierarchy(path, class_name, language="python")`	Returns direct subclasses detected from simple base-class names.

Supported Scope

Python files parsed by LibCST.
Symbol kinds: modules, classes, functions, and methods.
Same-module reference lookup for simple names.
Direct caller detection from function or method containers.
Direct subclass detection for simple class Child(Base): inheritance.
Structured error responses for unsupported languages and missing symbols.

Current Limitations

Cross-file imports and package-wide resolution are out of scope for v1.
Aliases, star imports, dynamic attribute access, and qualified references are not resolved.
call_chain currently returns direct callers only; recursive multi-hop expansion is not implemented.
class_hierarchy currently returns direct subclasses only and handles simple base names.
TypeScript is intentionally unsupported in v1.

Local Development

Install dependencies:

uv sync --extra dev

Run the MCP server:

uv run mcp-ast-explorer

Run verification:

uv run ruff check .

uv run mypy uv run pytest

License

MIT

MCP AST Explorer

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Developer toolsi

Common questions

Alternatives

GitHub

Desktop Commander

Cloudflare MCP

README from the maker

mcp-ast-explorer

Codebase Onboarding Stack

Status

Tools

Supported Scope

Current Limitations

Local Development

License