Chrome Devtools CliSAFE

Chrome DevTools for coding agents

The instruction file, verbatim from the audited commit — this is the text the model reads, and the surface the audit's instruction layer examines. Quoted here so you can judge it without cloning anything.

---
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

```sh
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)

```bash
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

```bash
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 --type "reload" --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

Each `emulate` call replaces all previously configured emulation settings (except `--extraHttpHeaders`), so pass all desired settings in a single call.

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

## Performance

```bash
chrome-devtools performance_analyze_insight 1 "NAVIGATION_0" "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

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

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

```bash
chrome-devtools get_heapsnapshot

SAFEgrade B · trust 89/100 Nothing in the source contradicts what it says it does. Grade A is reserved for packages that have also passed the behavioural sandbox.

What the source does

Filesystem

none-observed

Network

none-observed

Shell

none-observed

Dependencies

pinned

Secrets in source

none-found

Findings (0)

No findings outside the package's declared scope.

Gates applied: no_behavioural_pass.

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