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Ruslan LesiutinandGitHub 54831395ea [react-devtools-cdt-mcp] chrome-devtools-mcp integration (#36600)
> [!NOTE]
> I had to invalidate `node_modules` cache keys on CI, because we are
now using `react-devtools-facade` package and we need to create a
symlink to it, otherwise Flow will fail. We use a hash value of
`yarn.lock`, but it's not invalidated when a package inside yarn
workspace is using another private package.

---

This change introduces new `react-devtools-cdt-mcp` package, which is
responsible for installing React tools for `chrome-devtools-mcp` server.
It is using `react-devtools-facade` as a dependency: it doesn't own the
implementation of these tools, it just relays Facade's tools to
`chrome-devtools-mcp` format.

When CDT MCP navigates to a fresh page, it emits unique
`devtoolsdiscovery` method, that has `respondWith` method, which is the
integration point between runtime libraries and MCP server.
`react-devtools-cdt-mcp` is the owner for this integration. More details
are available here -
https://github.com/ChromeDevTools/chrome-devtools-mcp/blob/main/docs/third-party-developer-tools.md.

Here is the list of tools that are being installed:
- `react_get_component_tree`
- `react_get_component_by_uid`
- `react_find_components`
- `react_get_component_source`
- `react_get_owner_stack_trace`
- `react_get_owner_stack`
- `react_start_profiling`
- `react_stop_profiling `
- `react_get_trace_overview`
- `react_get_commit_report`

--- 
Quick demo how to test the package with `chrome-devtools-mcp` CLI. Steps
are also mentioned in `README` file:


https://github.com/user-attachments/assets/af9fefce-03f0-4ebd-a94f-e9dd72b87f4d
2026-06-30 17:52:30 +02:00

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HTML

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>react-devtools-cdt-mcp fixture</title>
<style>
body {
font-family: -apple-system, system-ui, sans-serif;
margin: 2rem;
color: #1c1e21;
}
.app {
max-width: 40rem;
}
.panel {
border: 1px solid #ddd;
border-radius: 8px;
padding: 1rem;
margin: 1rem 0;
}
.panel[data-theme='dark'] {
background: #f5f6f7;
}
.row {
display: flex;
align-items: center;
gap: 0.5rem;
margin: 0.25rem 0;
}
button {
cursor: pointer;
}
</style>
</head>
<body>
<div id="root"></div>
<script src="/dist/bundle.js"></script>
</body>
</html>