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Agent skill

Nix Chrome Devtools MCP

by srid in srid/emanote

chrome-devtools-mcp launcher — a single bash script that resolves Playwright's bundled Chrome-for-Testing and Node.js directly through Nix.

Custom licenceAuto-check passedTesting & QA

Install Nix Chrome Devtools MCP

skills CLI
$ npx skills add srid/emanote --skill nix-chrome-devtools-mcp -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install srid/emanote nix-chrome-devtools-mcp --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/srid/emanote.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/nix-chrome-devtools-mcp .claude/skills/nix-chrome-devtools-mcp && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
nix-chrome-devtools-mcp
GitHub stars
963
Token cost
~271 tokens
SKILL.md length
77 words
Files
2
Skills in repo
25
Repo updated
First seen
Licence
Custom licence

At a glance

chrome-devtools-mcp launcher — a single bash script that resolves Playwright's bundled Chrome-for-Testing and Node.js directly through Nix.

  • Tasks that involve Browser testing
  • Calls nix

What it does

Nix Chrome Devtools MCP is an agent skill from srid/emanote. chrome-devtools-mcp launcher — a single bash script that resolves Playwright's bundled Chrome-for-Testing and Node.js directly through Nix. See repo README for usage, override mechanisms, and version compatibility.

Its SKILL.md is about 270 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files.

It sits in Testing & QA, covering Browser testing. It works with Model Context Protocol, Chrome DevTools, Playwright and Bash. The repository describes itself as: Emanate a structured view of your plain-text notes.

When your agent uses it

  • Tasks that involve Browser testing

Example prompts

  • “/nix-chrome-devtools-mcp”

Requirements

  • Node.js

What it can do on your machine

Read from SKILL.md and the folder at commit 9d01037. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • nix

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • github.com
    • microsoft.github.io

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Nix Chrome Devtools MCP loads about 271 tokens when it runs. Until then it costs about 60 tokens; SKILL.md has 77 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~60
When it runs · the whole SKILL.md, loaded when a task matches
~271

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 77 words (~271 tokens).

“Drop-in launcher for the Chrome DevTools MCP server. Self-contained — bin/serve resolves all inputs via nix build / nix shell.”

— opening of SKILL.md by srid, Custom licence
name
nix-chrome-devtools-mcp
user-invocable
false

Read the full SKILL.md on GitHub

Files

SKILL.md and 1 other file in .agents/skills/nix-chrome-devtools-mcp of srid/emanote.

  • SKILL.md
  • bin/serve

Open the folder on GitHubat commit 9d01037

Compare with similar skills

Nix Chrome Devtools MCP next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Nix Chrome Devtools MCP compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Nix Chrome Devtools MCP this skillsrid/emanote963—~271Automated safety check: PassCustom licence
Mirroir Onboardjfarcand/mirroir-mcp246—~4.4kAutomated safety check: NotesApache-2.0
Record E2E Giflablup/backend.ai-webui133—~907Automated safety check: NotesLGPL-3.0
Chrome Devtoolstech-leads-club/agent-skills7k—~1.3kAutomated safety check: PassMIT
Sap Sac Test Automationsecondsky/sap-skills462—~4.2kAutomated safety check: PassGPL-3.0
Doctorbluzir/claude-code-design106—~931Automated safety check: PassNone

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Works with

Categories

Questions about Nix Chrome Devtools MCP

What does Nix Chrome Devtools MCP do?

chrome-devtools-mcp launcher — a single bash script that resolves Playwright's bundled Chrome-for-Testing and Node.js directly through Nix. Nix Chrome Devtools MCP is an agent skill from srid/emanote.js directly through Nix.

When should I use Nix Chrome Devtools MCP?

Nix Chrome Devtools MCP fits situations like: tasks that involve Browser testing.

How do I install Nix Chrome Devtools MCP in Claude Code?

Run `npx skills add srid/emanote --skill nix-chrome-devtools-mcp -a claude-code`. Or copy the skill folder (.agents/skills/nix-chrome-devtools-mcp in srid/emanote) into .claude/skills/nix-chrome-devtools-mcp in your project. Claude Code loads it when a task matches its description.

How do I install Nix Chrome Devtools MCP in Codex?

Run `npx skills add srid/emanote --skill nix-chrome-devtools-mcp -a codex`. Or copy the skill folder (.agents/skills/nix-chrome-devtools-mcp in srid/emanote) into .agents/skills/nix-chrome-devtools-mcp in your project. Codex loads it when a task matches its description.

Can I use Nix Chrome Devtools MCP in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add srid/emanote --skill nix-chrome-devtools-mcp -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/nix-chrome-devtools-mcp, .gemini/skills/nix-chrome-devtools-mcp, .github/skills/nix-chrome-devtools-mcp and .opencode/skills/nix-chrome-devtools-mcp in your project.

What does Nix Chrome Devtools MCP need to run?

Going by SKILL.md and its folder, Nix Chrome Devtools MCP needs the command-line tools its instructions call (nix). Our summary lists: Node.js.

Does Nix Chrome Devtools MCP access the network?

SKILL.md names 2 domains. As links in the text: github.com and microsoft.github.io. This is read from the text; nothing was executed.

Is Nix Chrome Devtools MCP safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Nix Chrome Devtools MCP use?

Nix Chrome Devtools MCP has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Nix Chrome Devtools MCP use?

About 271 tokens (SKILL.md is roughly 1.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Nix Chrome Devtools MCP?

Skills that share tags, products or a category with Nix Chrome Devtools MCP: Mirroir Onboard (jfarcand/mirroir-mcp, 246 stars), Record E2E Gif (lablup/backend.ai-webui, 133 stars), Chrome Devtools (tech-leads-club/agent-skills, 7k stars) and Sap Sac Test Automation (secondsky/sap-skills, 462 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Nix Chrome Devtools MCP?

srid (a GitHub user) maintains it in srid/emanote, which has 963 GitHub stars. The repository holds 25 skills in this directory. The repository was last updated on July 26, 2026.

Source: srid/emanote on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.