5259fe44ee
Both agents now get the MCP server without a separate launcher: home-manager owns one config file per agent next to each agent's own mutable state file (~/.codex/config.toml and ~/.claude.json stay untouched), and zsh aliases make the layered profile / --mcp-config call the default. Drop pkgs.chromium and --executable-path: the browsers bundled with playwright-mcp work on their own, so this removes a redundant chromium closure. --browser chrome would have looked for a branded Chrome under /opt/google. Add --output-dir so page snapshots stop landing in whatever repository the agent runs in, and give each agent its own profile so both can drive a browser in parallel. Verified on tnix: codex --profile playwright mcp list shows the server, and claude reports browser_navigate as available (NO in a control directory). Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01543pvEuBqu1G4rimyXq3YA
84 lines
3.4 KiB
Nix
84 lines
3.4 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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# This is intentionally an explicit guard in addition to flake.lock. An
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# input update must consciously update this value and repeat the MCP smoke
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# test documented in docs/playwright-mcp.md.
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playwrightMcpVersion = "0.0.76";
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stateDir = "${config.home.homeDirectory}/.local/share/playwright-mcp";
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# A Chromium user-data directory may be used by exactly one process at a
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# time. Each agent therefore gets its own profile, so Codex and Claude may
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# drive a browser in parallel instead of failing over a locked profile.
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agents = [ "codex" "claude" ];
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profileDir = agent: "${stateDir}/${agent}/profile";
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# The browsers Playwright was tested against already ship with the
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# playwright-mcp package; pkgs.chromium would be a second, redundant browser
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# closure. "chrome" would instead look for a branded Google Chrome under
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# /opt/google/chrome and fail.
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mkServer = agent: {
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command = "${pkgs.playwright-mcp}/bin/playwright-mcp";
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args = [
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"--browser"
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"chromium"
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"--user-data-dir"
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(profileDir agent)
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# Without this the server drops page snapshots into a .playwright-mcp
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# directory below the current working directory, i.e. into whatever
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# repository the agent happens to run in.
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"--output-dir"
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"${stateDir}/${agent}/output"
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];
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# The nixpkgs wrapper switches to an in-memory profile unless this is set,
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# which would discard logins between sessions.
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env.PLAYWRIGHT_MCP_USER_DATA_DIR = profileDir agent;
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};
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codexConfig = (pkgs.formats.toml { }).generate "codex-playwright.toml" {
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mcp_servers.playwright = mkServer "codex" // {
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startup_timeout_sec = 20;
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tool_timeout_sec = 60;
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};
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};
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claudeConfig = (pkgs.formats.json { }).generate "claude-playwright.json" {
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mcpServers.playwright = mkServer "claude";
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};
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claudeConfigPath = "${config.home.homeDirectory}/.claude/mcp-playwright.json";
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in
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{
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assertions = [
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{
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assertion = pkgs.playwright-mcp.version == playwrightMcpVersion;
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message = "playwright-mcp changed from ${playwrightMcpVersion}; review its release notes, update the pin, and repeat the MCP smoke test.";
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}
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];
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# Both agents read a file this module owns. Neither agent's own mutable
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# state file is touched: Codex rewrites ~/.codex/config.toml (trust levels,
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# model notices) and Claude rewrites ~/.claude.json, so home-manager must
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# not own either. Codex layers a named profile on top of its base config,
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# Claude takes an additional config file on the command line.
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home.file.".codex/playwright.config.toml".source = codexConfig;
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home.file.".claude/mcp-playwright.json".source = claudeConfig;
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# Make it the default for the interactive shell rather than a separate
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# command that has to be remembered. zsh does not re-expand an alias into
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# itself, so these still call the real binaries.
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programs.zsh.shellAliases = {
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codex = "codex --profile playwright";
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claude = "claude --mcp-config ${claudeConfigPath}";
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};
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# Browser profiles are runtime data, not Nix store artifacts; they only need
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# to exist with private permissions before the first launch.
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home.activation.playwrightMcpDirs =
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lib.hm.dag.entryAfter [ "writeBoundary" ] ''
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run ${pkgs.coreutils}/bin/install -d -m 0700 ${lib.escapeShellArg stateDir} \
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${lib.concatMapStringsSep " " (agent:
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lib.escapeShellArg "${stateDir}/${agent}") agents}
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'';
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}
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