chrome-cdp

Interact with local Chrome browser session (only on explicit user approval after being asked to inspect, debug, or interact with a page open in Chrome)

install

source · Clone the upstream repo

git clone https://github.com/pasky/chrome-cdp-skill

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/pasky/chrome-cdp-skill "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/chrome-cdp" ~/.claude/skills/pasky-chrome-cdp-skill-chrome-cdp && rm -rf "$T"

manifest: skills/chrome-cdp/SKILL.md

source content

Chrome CDP

Lightweight Chrome DevTools Protocol CLI. Connects directly via WebSocket — no Puppeteer, works with 100+ tabs, instant connection.

Prerequisites

Chrome (or Chromium, Brave, Edge, Vivaldi) with remote debugging enabled: open
```
chrome://inspect/#remote-debugging
```
and toggle the switch
Node.js 22+ (uses built-in WebSocket)
If your browser's
```
DevToolsActivePort
```
is in a non-standard location, set
```
CDP_PORT_FILE
```
to its full path

Commands

All commands use

scripts/cdp.mjs

. The

<target>

is a unique targetId prefix from

list

; copy the full prefix shown in the

list

output (for example

6BE827FA

). The CLI rejects ambiguous prefixes.

List open pages

scripts/cdp.mjs list

Take a screenshot

scripts/cdp.mjs shot <target> [file]    # default: screenshot-<target>.png in runtime dir

Captures the viewport only. Scroll first with

eval

if you need content below the fold. Output includes the page's DPR and coordinate conversion hint (see Coordinates below).

Accessibility tree snapshot

scripts/cdp.mjs snap <target>

Evaluate JavaScript

scripts/cdp.mjs eval <target> <expr>

Watch out: avoid index-based selection (
querySelectorAll(...)[i]
) across multiple
eval
calls when the DOM can change between them (e.g. after clicking Ignore, card indices shift). Collect all data in one
eval
or use stable selectors.

Other commands

scripts/cdp.mjs html    <target> [selector]   # full page or element HTML
scripts/cdp.mjs nav     <target> <url>         # navigate and wait for load
scripts/cdp.mjs net     <target>               # resource timing entries
scripts/cdp.mjs click   <target> <selector>    # click element by CSS selector
scripts/cdp.mjs clickxy <target> <x> <y>       # click at CSS pixel coords
scripts/cdp.mjs type    <target> <text>         # Input.insertText at current focus; works in cross-origin iframes unlike eval
scripts/cdp.mjs loadall <target> <selector> [ms]  # click "load more" until gone (default 1500ms between clicks)
scripts/cdp.mjs evalraw <target> <method> [json]  # raw CDP command passthrough
scripts/cdp.mjs open    [url]                  # open new tab (each triggers Allow prompt)
scripts/cdp.mjs stop    [target]               # stop daemon(s)

Coordinates

shot

saves an image at native resolution: image pixels = CSS pixels × DPR. CDP Input events (

clickxy

etc.) take CSS pixels.

CSS px = screenshot image px / DPR

shot

prints the DPR for the current page. Typical Retina (DPR=2): divide screenshot coords by 2.

Tips

Prefer
```
snap --compact
```
over
```
html
```
for page structure.
Use
```
type
```
(not eval) to enter text in cross-origin iframes —
```
click
```
/
```
clickxy
```
to focus first, then
```
type
```
.
Chrome shows an "Allow debugging" modal once per tab on first access. A background daemon keeps the session alive so subsequent commands need no further approval. Daemons auto-exit after 20 minutes of inactivity.