};
        hooks = {
          # Unreliable right now: https://github.com/anthropics/claude-code/issues/11947
          # Stop = [{
          #   hooks = [{
          #     type    = "prompt";
          #     prompt  = ''You are evaluating whether Claude should stop working. Context: $ARGUMENTS\n\nAnalyze the conversation and determine if:\n1. All user-requested tasks are complete\n2. Any errors need to be addressed\n3. Follow-up work is needed.'';
          #     timeout = 30;
          #   }];
          # }];
          # SubagentStop = [{
          #   hooks = [{
          #     type    = "prompt";
          #     prompt = ''Evaluate if this subagent should stop. Input: $ARGUMENTS\n\nCheck if:\n- The subagent completed its assigned task\n- Any errors occurred that need fixing\n- Additional context gathering is needed.'';
          #   }];
          # }];
          Notification = [
            {
              matcher = "permission_prompt|idle_prompt|elicitation_dialog";
              hooks   = [
                {
                  type    = "command";
                  command = "${pkgs.libnotify}/bin/notify-send --expire-time=15000 'Claude' 'Waiting for user input.'";
                }
              ];
            }
          ];

          PostToolUse = [
            {
      				matcher = "Edit|MultiEdit|Write";
      				hooks   = [
      				  {
                  type    = "command";
                  command = "~/.claude/hooks/format-files";
                }
      				];
            }
          ];

      mcpServers = {
        context7 = {
          type    = "http";
          url     = "https://mcp.context7.com/mcp";
          headers = {
            # We need this for higher limits but for now it's fine and doesn't stop us using it.
            CONTEXT7_API_KEY = "{file:${config.age.secrets.context7Key.path}}";
          };
        };

      # Creating with home-manager below to avoid permissions issues.
      # hooks = {};

      mcpServers = {

        # No support for reading from files yet. Add these manually.
        # ```
        # claude mcp add -s user -t http web-reader https://api.z.ai/api/mcp/web_reader/mcp --header "Authorization: Bearer your_api_key"
        # ```

        # No support for reading secrets from files yet. These are added with
        # `~/.claude/claude-mcps.sh` instead.
        # context7 = {
        #   type    = "http";
        #   url     = "https://mcp.context7.com/mcp";
        #   headers = {
        #     # We need this for higher limits but for now it's fine and doesn't stop us using it.
        #     CONTEXT7_API_KEY = "{file:${config.age.secrets.context7Key.path}}";
        #   };
        # };
        #

        # ```
        # claude mcp add -s user -t http web-search-prime https://api.z.ai/api/mcp/web_search_prime/mcp --header "Authorization: Bearer your_api_key"
        # ```

        #

        playwright = {

        playwriter = {

          command = "/run/current-system/sw/bin/nix";
          args    = [ "run" "nixpkgs#playwright-mcp" "--" ];

          command = "/run/current-system/sw/bin/npx";
          args    = [ "playwriter@latest" ];

          playwright = {

          playwriter = {

            command = [ "/run/current-system/sw/bin/nix" "run" "nixpkgs#playwright-mcp" "--" ];

            command = [ "/run/current-system/sw/bin/npx" "playwriter@latest" ];

    };
  # Create hooks with home-manager to avoid permissions issues.
    home.file.".claude/hooks/format-files" = {
      text = /* nu */ ''
        #!/usr/bin/env nu
        let json_input = (^cat)
        let file_path = ""
        if (which jq | is-empty) { exit 1 }
        let $file_path = ($json_input | from json | get tool_input.file_path)
        if ($file_path | is-empty) { exit 1 }
        let extension = ($file_path | path parse | get extension)
        let command = match ($extension | str trim) {
          "rs" if (which cargo | is-not-empty) => { ["rustfmt" $file_path] }
          "toml" if (which taplo | is-not-empty) => { ["taplo" "fmt" $file_path] }
          _ => { exit 1 }
        }
        ^$command.0 ...($command | skip 1)
      '';
      executable = true;

    # Helper script to add MCPs.
    home.file.".claude/claude-mcps.sh" = {
      text = ''
        #!/usr/bin/env bash
        # Run this once to add the MCP servers that need API keys
        claude mcp add -s user -t http context7 https://mcp.context7.com/mcp --header "CONTEXT7_API_KEY: $(cat ${config.age.secrets.context7Key.path})"
        claude mcp add -s user -t http web-reader https://api.z.ai/api/mcp/web_reader/mcp --header "Authorization: Bearer $(cat ${config.age.secrets.key.path})"
        claude mcp add -s user -t http web-search-prime https://api.z.ai/api/mcp/web_search_prime/mcp --header "Authorization: Bearer $(cat ${config.age.secrets.key.path})"
      '';
      executable = true;
    };