Add playwright-mcp package

[Pentusha]

Summary

This PR adds support for the Playwright MCP server and introduces automated dependency updates with CI integration.

New features

• playwright-mcp package — new flake output #playwright-mcp that packages the official Microsoft Playwright MCP server
• Auto-update workflow — daily cron job that checks for new Playwright/MCP versions, updates flake.lock, and creates/updates a PR with a detailed summary of changes
• CI workflow — runs nix build and nix flake check on Linux and macOS for every PR; auto-merges PRs labeled auto-update after CI passes
• Nix flake checks — add automated checks to validate the flake

Cleanup

• Remove dead code (fix deadnix and statix warnings)
• Consolidate duplicate MCP config examples in README; add config file locations table
• Bump actions/checkout from v4 to v6

Setup required by the repository owner

The auto-update workflow needs a Personal Access Token so that PRs it creates trigger the CI workflow (events from the default GITHUB_TOKEN do not trigger other workflows).

1. Create a fine-grained PAT

gh auth token  # verify you're authenticated

# Create a fine-grained PAT scoped to this repo with the required permissions
# This opens a browser to complete the token creation
open "https://github.com/settings/personal-access-tokens/new"

When creating the token:

• Repository access: select only this repository
• Permissions: Contents: Read and write, Pull requests: Read and write
• Expiration: choose an appropriate lifetime

2. Add the token as a repository secret

# You'll be prompted to paste the token value
gh secret set PAT_TOKEN --repo pietdevries94/playwright-web-flake

3. Create the auto-update label

The CI workflow uses this label to identify PRs eligible for auto-merge.

gh label create auto-update \
  --description "Automated dependency update" \
  --color "0E8A16" \
  --repo pietdevries94/playwright-web-flake

Usage

nix shell github:pietdevries94/playwright-web-flake#playwright-mcp

Claude Configuration

Add to your MCP config file:

{
  "mcpServers": {
    "playwright": {
      "command": "nix",
      "args": ["shell", "github:pietdevries94/playwright-web-flake#playwright-mcp", "--command", "playwright-mcp", "--headless"]
    }
  }
}

Tool	Config File Path
Claude Desktop	~/.config/claude/claude_desktop_config.json
Claude Code	.mcp.json (project root)

[Copilot]

Pull request overview

This PR adds support for running the Playwright MCP server from the flake and documents how to configure it for MCP-compatible clients.

Changes:

• Added a playwright-mcp Nix package (Node workspace build) and exposed it via flake.nix.
• Added flake checks for playwright-test, playwright-driver, and playwright-mcp.
• Updated driver-related Nix expressions (deps/args cleanups) and documented MCP configuration + config file locations in the README.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
README.md	Documents how to run/configure the new Playwright MCP server and where MCP config files live for Claude tools.
playwright-mcp/package.nix	Introduces a playwright-mcp package build and wraps the executable with Playwright-related environment.
flake.nix	Exposes playwright-mcp as a flake package and adds basic build/runtime checks.
playwright-driver/webkit.nix	Adds hyphen to WebKit runtime deps and minor overrideAttrs lambda cleanup.
playwright-driver/ffmpeg.nix	Removes an unused argument and normalizes the revisionOverrides default.
playwright-driver/driver.nix	Removes unused parameters/defaults and minor attribute-set cleanup.
playwright-driver/chromium.nix	Removes unused parameters from the function signature.

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[bitbloxhub]

This does a lot more than it says in the title, including many minor stylistic changes, changing how update scripts work, and has an messy commit history. I'd be happy to review individual PRs for each of these changes, but not one big messy one.

[Pentusha]

@bitbloxhub yes, for sure. I'll open few new PRs instead soon.