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automator-mcp

by VetCoders

run_applescript

Execute AppleScript code on macOS to automate tasks, control applications, and perform system operations through the automator-mcp server.

Instructions

Execute AppleScript code on macOS

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
scriptYesAppleScript code to execute

Implementation Reference

  • Executes the provided AppleScript code using the `osascript` command via Node.js `execSync`, with single quote escaping for safety. Returns the result as MCP content or throws an error.
    async runAppleScript(script) {
      try {
        const result = execSync(`osascript -e '${script.replace(/'/g, "'\"'\"'")}'`, {
          encoding: 'utf8',
        });
        
        return {
          content: [
            {
              type: 'text',
              text: result.trim() || 'Script executed successfully',
            },
          ],
        };
      } catch (error) {
        throw new Error(`AppleScript error: ${error.message}`);
      }
    }
  • src/index.js:37-50 (registration)
    Registers the 'run_applescript' tool in the ListTools response, including name, description, and input schema.
    {
      name: 'run_applescript',
      description: 'Execute AppleScript code on macOS',
      inputSchema: {
        type: 'object',
        properties: {
          script: {
            type: 'string',
            description: 'AppleScript code to execute',
          },
        },
        required: ['script'],
      },
    },
  • Defines the input schema for the 'run_applescript' tool, requiring a 'script' property of type string.
    inputSchema: {
      type: 'object',
      properties: {
        script: {
          type: 'string',
          description: 'AppleScript code to execute',
        },
      },
      required: ['script'],
    },
  • Dispatches calls to the 'run_applescript' tool by invoking the runAppleScript method in the CallToolRequest handler.
    case 'run_applescript':
      return await this.runAppleScript(args.script);

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

B3.1/5.0
Behavior2/5

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

With no annotations, the description carries the full burden. It does not disclose execution behavior (synchronous/asynchronous), error handling, security implications, or side effects. For a code execution tool, this is a significant gap.

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

Conciseness4/5

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

A single, concise sentence with no waste. It is appropriately sized for a simple tool with one parameter, though it could add a bit more context without becoming verbose.

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 complexity of code execution and lack of output schema and annotations, the description is insufficient. It omits return values, error behavior, and security considerations, leaving the agent underinformed.

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?

Schema coverage is 100% and the parameter description 'AppleScript code to execute' already states the purpose. The tool description adds no additional semantic value beyond what the schema provides.

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

Purpose5/5

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

The description clearly states the action ('Execute') and the resource ('AppleScript code on macOS'), distinguishing it from sibling tools like run_jxa, which runs JavaScript for Automation.

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?

No guidance on when to use AppleScript vs alternatives like run_jxa or system_automation. The description provides no context for selection.

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