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Fingerprint CI Gate

Gate your CI build on browser-fingerprint regressions using liarjs baselines and score floors.

Dev & CodingIntermediate★ 5⑂ 0AI score 8/10Last updated: Aug 6, 2026

What it does

  • Runs the liarjs CLI to scan a headless browser's fingerprint and writes the result to JSON.
  • Offers two gating mechanisms: an absolute floor (--min-score) and a baseline diff between two saved scans.
  • Produces ready-to-use snippets for GitHub Actions, GitLab CI, Docker images and Playwright assertions.
  • Wires exit codes (0 clean, 1 below floor, 2 error) into the pipeline so jobs fail at the right moment.
  • Covers network policy: --offline for air-gapped runners, --endpoint for a self-hosted worker.

Who it's for

  • Teams running scraping harnesses or automation bots who want to catch rising block rates early.
  • Engineers shipping custom Chromium builds who need fingerprint regressions caught pre-release.
  • DevOps folks asked to add a headless-detection check to an existing pipeline.

Examples

  1. "Add a step to our GitHub Actions that fails if the fingerprint score drops below 60" → generates setup-node, npx liarjs@0.3 --headless --json scan.json --min-score 60, and an artifact upload.
  2. "Our datacenter IP always fails the tz check — how do I gate on that?" → switches to a baseline.json diff instead of an absolute floor.
  3. "Track how the score moves per commit" → stores scan.json as an artifact and sets a convention for deliberate baseline-refresh commits.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/liarjsdev/liarjs-skills/HEAD/skills/fingerprint-ci-gate/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on AI Skill Mart.
Copy the skills/fingerprint-ci-gate folder from the GitHub repo liarjsdev/liarjs-skills into my ~/.claude/skills/fingerprint-ci-gate/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/liarjsdev/liarjs-skills.git && mkdir -p ~/.claude/skills && cp -r liarjs-skills/skills/fingerprint-ci-gate ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal and confirm Node.js 22 or newer: node -v
  2. Clone the skills repository: git clone https://github.com/liarjsdev/liarjs-skills.git
  3. Create the skills folder if needed: mkdir -p ~/.claude/skills
  4. Copy this skill into place: cp -r liarjs-skills/skills/fingerprint-ci-gate ~/.claude/skills/
  5. Restart Claude Code and ask something like "add a fingerprint gate to my CI pipeline" to trigger it.
  6. Real runs need a Chromium in the environment; on Docker pass --shm-size=1g so the browser can start.
View source on GitHub ↗License: MIT