Playwright MCP Server - NixOS Flake

@benjaminkitt

Basic information

About Playwright MCP Server - NixOS Flake

A comprehensive NixOS Flake development environment for the Playwright MCP (Model Context Protocol) server with full Chrome and Firefox support, including persistent browser profiles.

#playwright#nixos#development-environment

Playwright MCP Server - NixOS Flake config

No standard config provided

This server doesn't expose a parseable MCP config block in its README. See the repository for install instructions.

Repository

Playwright MCP Server - NixOS Flake tools

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Overview

What is Playwright MCP Server - NixOS Flake?

A NixOS Flake development environment for the Playwright Model Context Protocol (MCP) server, providing complete Chrome/Chromium and Firefox browser support with persistent browser profiles. It wraps Microsoft’s official Playwright MCP server with NixOS-specific configurations for developers who want a reproducible setup on NixOS.

How to use Playwright MCP Server - NixOS Flake?

Clone or copy flake.nix, then activate with direnv allow or manually with nix develop. Run the server using playwright-mcp-wrapped (headed mode by default) or nix run. Use flags such as --headless, --browser firefox, --config /path/to/config.json, or --port 8931 for server mode. Import desktop profiles by running nix run .#setup-profiles.

Key features of Playwright MCP Server - NixOS Flake

Complete Playwright MCP server setup based on Microsoft’s implementation
Multi-browser support: Chrome/Chromium and Firefox
Browser profile persistence between sessions
Desktop profile integration (import existing profiles)
Properly configured for NixOS with all dependencies
Ready-to-use development shell with all tools
AI agent compatible (can be added as a URL to dev environments)

Use cases of Playwright MCP Server - NixOS Flake

Running Playwright MCP server on NixOS with persistent browser profiles
Using browser-automated AI agents that need recurring login state
Importing existing desktop Chrome or Firefox profiles into Playwright MCP
Configuring a remote MCP server accessible over a network port
Adding Playwright MCP as a development environment for Claude Desktop or similar AI tools

Frequently asked questions

How does this differ from the upstream Microsoft Playwright MCP server?

This flake wraps the upstream server with NixOS-specific configurations, providing multi-browser support, profile persistence, and a development shell, all managed via Nix.

What browsers are supported and how are they integrated?

Chrome/Chromium and Firefox are included as Nix packages and properly configured for Playwright. You can specify the browser with the `--browser` flag.

Where are browser profiles stored?

Browser profiles are stored in `~/.local/share/playwright-mcp/` – Chrome/Chromium under `chrome-profile` and Firefox under `firefox-profile`.

What if I get a “browser not found” error?

Run `nix run .#playwright-mcp -- --browser chromium` or set `PLAYWRIGHT_BROWSERS_PATH` to the Nix-build path for Playwright browsers.

How do I reset or fix profile issues?

Remove the profile directory (`~/.local/share/playwright-mcp/`) and rerun `nix run .#setup-profiles` to copy fresh profiles. Ensure the directory is writable with `chmod -R u+w`.

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