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Moom MCP Server

by itrimble

launch_application

Launch applications to configure Moom window layouts on macOS using natural language commands in Claude Desktop.

Instructions

Launch a specified application for workflow setup

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
appNameYesName of the application to launch

Implementation Reference

  • The main handler function for the 'launch_application' tool. It executes an AppleScript command to activate (launch if not running) the specified application and returns success or error message.
    async launchApplication(appName) {
      const script = `tell application "${appName}" to activate`;
      
      try {
        await this.runAppleScript(script);
        return {
          content: [{
            type: 'text',
            text: `Successfully launched ${appName}`
          }]
        };
      } catch (error) {
        return {
          content: [{
            type: 'text',
            text: `Error launching ${appName}: ${error.message}`
          }]
        };
      }
    }
  • Input schema definition for the 'launch_application' tool, specifying that it requires an 'appName' string parameter.
    name: 'launch_application',
    description: 'Launch a specified application for workflow setup',
    inputSchema: {
      type: 'object',
      properties: {
        appName: {
          type: 'string',
          description: 'Name of the application to launch',
        },
      },
      required: ['appName'],
    },
  • src/index.js:225-226 (registration)
    Registration and dispatch of the 'launch_application' tool in the CallToolRequestHandler switch statement, routing calls to the handler function.
    case 'launch_application':
      return await this.launchApplication(args.appName);
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries full burden for behavioral disclosure. It states the tool 'launches' an application but doesn't describe what happens after launch (e.g., whether it brings the app to foreground, waits for completion, handles errors, or requires specific permissions). For a mutation tool with zero annotation coverage, this leaves significant behavioral gaps.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence that directly states the tool's purpose without unnecessary words. It is appropriately sized and front-loaded with the core action, earning its place as a concise definition.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool has no annotations, no output schema, and a simple input schema, the description is incomplete. It doesn't explain what constitutes a valid 'appName', what happens on success/failure, or how this integrates with the sibling tools for workflow management. For a tool that performs an action like launching applications, more context is needed.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema has 100% description coverage, with the single parameter 'appName' documented as 'Name of the application to launch'. The description adds no additional parameter semantics beyond what the schema provides, so it meets the baseline of 3 for high schema coverage without adding value.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('launch') and target ('specified application') with a purpose ('for workflow setup'). It distinguishes from siblings like 'activate_layout' or 'set_window_position' which manipulate layouts/windows rather than launching applications. However, it doesn't specify what types of applications or platforms are supported.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides minimal context ('for workflow setup') but gives no explicit guidance on when to use this tool versus alternatives. It doesn't mention prerequisites, when-not-to-use scenarios, or how it relates to sibling tools like 'trigger_moom_action' or 'show_moom_menu' which might offer similar functionality.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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