agent-browser React introspection commands and init scripts

Introduced 2026-05-07 · score 0.98

HOW TO USE IT

For a React app, install the React DevTools hook at launch before inspecting it. Run `react tree`, `react inspect <fiberId>`, `react renders start` then `react renders stop`, or `react suspense` to inspect the tree, a fiber, renders, or Suspense boundaries.

WHY THIS HELPS

Inspect a React application in a browser session by examining its component state, render behavior, and Suspense boundaries.

REQUIREMENTS AND LIMITATIONS

• Version: v0.27.0
• <url> (required): URL to open; React commands require the hook enabled at launch.
• --enable <feature>: Enables a built-in init-script feature; `react-devtools` is the feature documented for React inspection. Repeatable.
• AGENT_BROWSER_ENABLE: Comma-separated built-in init-script features, such as `react-devtools`.
• <fiberId> (required): Fiber identifier to inspect; command reports props, hooks, state, and source.
• --init-script <path>: Registers a page init script before first navigation; repeatable.
• AGENT_BROWSER_INIT_SCRIPTS: Comma-separated init-script paths.
• Prerequisite: The React DevTools hook must be installed at launch with `--enable react-devtools`; without it, `react` commands error.
• Init scripts are registered before first navigation.
• The `--init-script` and `--enable` flags are repeatable.
• The React DevTools hook is vendored and embedded in the binary with zero runtime dependencies.

FIRST-PARTY EVIDENCE

• https://github.com/vercel-labs/agent-browser/releases/tag/v0.27.0
• https://github.com/vercel-labs/agent-browser/blob/v0.27.0/skill-data/core/references/commands.md
• https://github.com/vercel-labs/agent-browser/blob/v0.27.0/skill-data/core/SKILL.md

Check the installed version and the source before using it. Entry JSON

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