Browy DevTools CLI

Available now in v0.1.x

The Browy extension registers a DevTools panel that hosts a terminal-style REPL for the agent. Open Chrome DevTools on any page, click the Browy tab, and you get the same agent that runs in the side panel, with a CLI instead of a chat bubble.

The DevTools CLI with /model open.

Why a CLI in DevTools?

Where you already are

Inspect the DOM, check the network panel, then ask the agent something, without leaving DevTools.

Terminal feel

Slash commands, history, autocomplete, Ctrl+L to clear, Esc to cancel. If you’ve used gh copilot it’ll feel obvious.

Per-tab session

Each DevTools panel is tied to the tab it was opened on. Open one per tab to run separate agents in parallel.

Same agent

Same backend, same tools, same session store as the side panel, including the page snapshots, click/type tools, and network log.

Slash commands

Type / to autocomplete. Aliases: /? → /help, /models → /model.

Session

Command	What it does
/help	Show all available commands
/clear	Clear the scrollback (also Ctrl+L)
/new	Start a new conversation
/reset	Abandon this session and start fresh
/cancel	Cancel the in-flight agent turn (also Esc)
/sessions	List recent chat sessions
/copy	Copy the last response to clipboard
/export	Download the scrollback as a .txt file
/history	Show recent input history

Model & auth

Command	What it does
/model	Show current model + open the live picker
/model <id>	Switch model directly, e.g. /model claude-haiku-4.5
/login	Trigger the GitHub Copilot device-flow sign-in

Page introspection (no agent turn)

These run locally in DevTools and don’t go through the model.

Command	What it does
/url	Print the inspected page URL
/title	Print the inspected page <title>
/tabs	List open browser tabs (click a row to switch)
/snapshot	Quick page summary (title, URL, headings)
/dom <selector>	querySelectorAll summary for a CSS selector
/eval <expr>	Eval JavaScript in the inspected page
/js	Toggle a JS REPL mode: every line is evaluated in the inspected page until you /js again

UI & meta

Command	What it does
/theme [auto|dark|light]	Set the panel theme
/version	Show version info
/feedback	Open the feedback page on GitHub
/exit	Close-this-panel hint (close DevTools to actually exit)

Models the picker exposes today (subject to your Copilot subscription):

• Claude family: claude-sonnet-4.6, claude-sonnet-4.5, claude-haiku-4.5, claude-opus-4.7, claude-opus-4.6, claude-opus-4.5
• GPT family: gpt-5.5, gpt-5.4, gpt-5.3-codex, gpt-5.2-codex, gpt-5.4-mini, gpt-5-mini, gpt-4.1
• And the auto selector that lets Copilot pick

The model badge in the toolbar always shows the active choice.

Keyboard

Key	Action
Enter	Send
Shift+Enter	Newline in the prompt
Esc	Cancel an in-flight request
Ctrl+L	Clear the log
↑ / ↓	Browse prompt history (when the input is empty)
/ then Tab	Autocomplete a slash command

When to use it vs. the side panel

If you want…	Use…
A persistent chat next to the page, with screenshots inline	Side panel
To stay focused inside DevTools, run quick agent prompts against the inspected target	DevTools CLI
Multiple parallel agent sessions, one per inspected tab	DevTools CLI (open DevTools on each tab)
To pair-program with the agent on a feature	DevTools CLI + bash tool enabled in Settings

Coming soon to the CLI

Tracked in the open on the GitHub project board.

• Attach to running session: open a debug view of an active Browy side-panel session from the panel.

See also

Tools the agent has Every tool the DevTools CLI agent can call.

First chat Things to try in the side panel or DevTools CLI.

Install Get the extension and native host running.