/chrome-devtools-cli

name: chrome-devtools-cli
description: Use this skill to write shell scripts or run shell commands to automate tasks in the browser or otherwise use Chrome DevTools via CLI.

The `chrome-devtools-mcp` CLI lets you interact with the browser from your terminal.

Setup

_Note: If this is your very first time using the CLI, see [references/installation.md](references/installation.md) for setup. Installation is a one-time prerequisite and is **not** part of the regular AI workflow._

AI Workflow

1. **Execute**: Run tools directly. If you don't know the target page's ID, run `chrome-devtools list_pages` to find it. The background server starts implicitly; **do not** run `start`/`status`/`stop` before each use. 2. **Inspect**: Use `chrome-devtools take_snapshot <pageId>` to get an element `<uid>`. 3. **Act**: Use `chrome-devtools click <pageId> <uid>`, `chrome-devtools fill <pageId> <uid> <value>`, etc. State persists across commands.

Snapshot example:

uid=1_0 RootWebArea "Example Domain" url="https://example.com/"
  uid=1_1 heading "Example Domain" level="1"

Permissions & File Access

By default, the CLI has full filesystem access (`--allowUnrestrictedPaths=true`), allowing file-saving parameters (`--filePath`, `--outputDirPath`) and `upload_file` to access files anywhere on the system. Pass `--allowUnrestrictedPaths=false` if you want to restrict file access to the OS temp directory.

Command Usage

chrome-devtools <tool> [arguments] [flags]

• Required arguments are passed positionally; optional arguments use flags.
• Use `--help` on any command for usage details.
• Output defaults to plain Markdown-like text; pass `--output-format=json` for JSON.

Input Automation (<uid> from snapshot)

chrome-devtools take_snapshot 1 # Take a text snapshot of the page to get UIDs for elements
chrome-devtools click 1 "id" # Clicks on the provided element
chrome-devtools click 1 "id" --dblClick true --includeSnapshot true # Double clicks and returns a snapshot
chrome-devtools drag 1 "src" "dst" # Drag an element onto another element
chrome-devtools drag 1 "src" "dst" --includeSnapshot true # Drag an element and return a snapshot
chrome-devtools fill 1 "id" "text" # Type text into an input, textarea, or select an option
chrome-devtools fill 1 "id" "text" --includeSnapshot true # Fill an element and return a snapshot
chrome-devtools handle_dialog 1 accept # Handle a browser dialog (accept/dismiss)
chrome-devtools handle_dialog 1 dismiss --promptText "hi" # Dismiss a dialog with prompt text
chrome-devtools hover 1 "id" # Hover over the provided element
chrome-devtools hover 1 "id" --includeSnapshot true # Hover over an element and return a snapshot
chrome-devtools press_key 1 "Enter" # Press a key or key combination ("Control+A", "Escape")
chrome-devtools press_key 1 "Control+A" --includeSnapshot true # Press a key and return a snapshot
chrome-devtools type_text 1 "hello" # Type text using keyboard into a focused input
chrome-devtools type_text 1 "hello" --submitKey "Enter" # Type text and press a submit key
chrome-devtools upload_file 1 "id" "file.txt" # Upload a file through a provided element
chrome-devtools upload_file 1 "id" "file.txt" --includeSnapshot true # Upload a file and return a snapshot

Navigation

chrome-devtools close_page 1 # Closes the page by its index
chrome-devtools list_pages # Get a list of pages open in the browser
chrome-devtools navigate_page 1 --url "https://example.com" # Navigates the currently selected page to a URL
chrome-devtools navigate_page 1 --type "reload" --ignoreCache true # Reload page ignoring cache
chrome-devtools navigate_page 1 --url "https://example.com" --timeout 5000 # Navigate with a timeout
chrome-devtools navigate_page 1 --handleBeforeUnload "accept" # Handle before unload dialog
chrome-devtools navigate_page 1 --type "back" --initScript "foo()" # Navigate back and run an init script
chrome-devtools new_page "https://example.com" # Creates a new page
chrome-devtools new_page "https://example.com" --background true --timeout 5000 # Create new page in background
chrome-devtools new_page "https://example.com" --isolatedContext "ctx" # Create new page with isolated context
chrome-devtools select_page 1 # Select a page as a context for future tool calls
chrome-devtools select_page 1 --bringToFront true # Select a page and bring it to front

Emulation

chrome-devtools emulate 1 --networkConditions "Offline" # Emulate network conditions
chrome-devtools emulate 1 --cpuThrottlingRate 4 --geolocation "0x0" # Emulate CPU throttling and geolocation
chrome-devtools emulate 1 --colorScheme "dark" --viewport "1920x1080" # Emulate color scheme and viewport
chrome-devtools emulate 1 --userAgent "Mozilla/5.0..." # Emulate user agent
chrome-devtools resize_page 1 1920 1080 # Resizes the selected page's window

Performance

chrome-devtools performance_analyze_insight 1 "1" "LCPBreakdown" # Get more details on a specific Performance Insight (pageId, insightSetId, insightName)
chrome-devtools performance_start_trace 1 --reload true --autoStop false # Starts a performance trace recording (reload, autoStop)
chrome-devtools performance_start_trace 1 --reload true --autoStop true --filePath "t.json.gz" # Start trace and save to a file
chrome-devtools performance_stop_trace 1 # Stops the active performance trace
chrome-devtools performance_stop_trace 1 --filePath "t.json.gz" # Stop trace and save to a file

Memory

chrome-devtools take_heapsnapshot 1 "./snap.heapsnapshot" # Capture a memory heap snapshot

Memory Debugging (requires `--memoryDebugging=true`)

chrome-devtools get_heapsnapshot_summary "./snap.heapsnapshot" # Get snapshot summary stats
chrome-devtools compare_heapsnapshots "./base.heapsnapshot" "./target.heapsnapshot" # Compare two snapshots
chrome-devtools get_heapsnapshot_class_nodes "./snap.heapsnapshot" "Array" # Inspect class instances
chrome-