Files
react/packages/react-devtools-extensions
Jorge Cabiedes 2b4064eb9b [mcp] Add MCP tool to print out the component tree of the currently open React App (#33305)
## Summary

This tool leverages DevTools to get the component tree from the
currently open React App. This gives realtime information to agents
about the state of the app.

## How did you test this change?

Tested integration with Claude Desktop
2025-06-02 21:42:34 -07:00
..

This is the source code for the React DevTools browser extension.

Installation

The easiest way to install this extension is as a browser add-on:

Local development

You can also build and install this extension from source.

Prerequisite steps

DevTools depends on local versions of several NPM packages1 also in this workspace. You'll need to either build or download those packages first.

1 Note that at this time, an experimental build is required because DevTools depends on the createRoot API.

To install all necessary dependencies, run the following command from the root of the repository:

yarn install

Build from source

To build dependencies from source, run the following command from the root of the repository:

yarn build-for-devtools

Download from CI

To use the latest build from CI, run the following commands starting from the root of the repository:

cd scripts/release
yarn install
./download-experimental-build.js

Build steps

Once the above packages have been built or downloaded, you can build the extension by running:

cd packages/react-devtools-extensions/

yarn build:chrome # => packages/react-devtools-extensions/chrome/build
yarn run test:chrome # Test Chrome extension

yarn build:firefox # => packages/react-devtools-extensions/firefox/build
yarn run test:firefox # Test Firefox extension

yarn build:edge # => packages/react-devtools-extensions/edge/build
yarn run test:edge # Test Edge extension