Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/amstaff666/chrome-devtools-mcp/chrome-devtools-clinpx skills add amstaff666/chrome-devtools-mcp --skill chrome-devtools-cligit clone --depth 1 https://github.com/amstaff666/chrome-devtools-mcpWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00031 | $0.01901 |
| Opus 5 | $0.00015 | $0.00950 |
| Sonnet 5 | $0.00006 | $0.00380 |
| Haiku 4.5 | $0.00003 | $0.00190 |
Grade A, and why
chrome-devtools-cli scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
100% identical to chrome-devtools-cli — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 154 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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 for setup. Installation is a one-time prerequisite and is not part of the regular AI workflow.
AI Workflow
- Execute: Run tools directly (e.g.,
chrome-devtools list_pages). The background server starts implicitly; do not runstart/status/stopbefore each use. - Inspect: Use
take_snapshotto get an element<uid>. - Act: Use
click,fill, 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"
Command Usage
chrome-devtools <tool> [arguments] [flags]
Use --help on any command. Output defaults to Markdown, use --output-format=json for JSON.
Input Automation ( from snapshot)
chrome-devtools take_snapshot --help # Help message for commands, works for any command.
chrome-devtools take_snapshot # Take a text snapshot of the page to get UIDs for elements
chrome-devtools click "id" # Clicks on the provided element
chrome-devtools click "id" --dblClick true --includeSnapshot true # Double clicks and returns a snapshot
chrome-devtools drag "src" "dst" # Drag an element onto another element
chrome-devtools drag "src" "dst" --includeSnapshot true # Drag an element and return a snapshot
chrome-devtools fill "id" "text" # Type text into an input or select an option
chrome-devtools fill "id" "text" --includeSnapshot true # Fill an element and return a snapshot
chrome-devtools handle_dialog accept # Handle a browser dialog
chrome-devtools handle_dialog dismiss --promptText "hi" # Dismiss a dialog with prompt text
chrome-devtools hover "id" # Hover over the provided element
chrome-devtools hover "id" --includeSnapshot true # Hover over an element and return a snapshot
chrome-devtools press_key "Enter" # Press a key or key combination
chrome-devtools press_key "Control+A" --includeSnapshot true # Press a key and return a snapshot
chrome-devtools type_text "hello" # Type text using keyboard into a focused input
chrome-devtools type_text "hello" --submitKey "Enter" # Type text and press a submit key
chrome-devtools upload_file "id" "file.txt" # Upload a file through a provided element
chrome-devtools upload_file "id" "file.txt" --includeSnapshot true # Upload a file and return a snapshot
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 154 lines · 31 tokens per session scan A 7382e3581eeb
chrome-devtools-cli is a skill published in the GitHub repository amstaff666/chrome-devtools-mcp (0 stars, last pushed 24d ago), licensed Apache-2.0. It adds 31 tokens to every session and 1,901 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to chrome-devtools-cli, differing in 0 lines, and is treated as a copy.
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