Google Maps MCP Server

Instructions

Implementation Reference

• src/index.ts:97-119 (handler)

  The main handler function that executes the add_post tool logic: validates the content input, creates a new Post object with a timestamp-based ID, adds it to the in-memory posts array, and returns a success message with the new post ID.

  async function handleAddPost(content: string) {
    console.error(`Handling add_post request with content: \"${content}\"`); // Log to stderr
    if (!content || typeof content !== 'string' || content.trim().length === 0) {
      return {
          content: [{ type: "text", text: "Error: Post content cannot be empty." }],
          isError: true,
      };
    }
    
    // Actually add the post to our array
    const newPost: Post = {
      id: Date.now().toString(),
      content,
      timestamp: Date.now()
    };
    
    posts.push(newPost);
    
    return {
      content: [{ type: "text", text: `Success! Post added with ID: ${newPost.id}` }],
      isError: false,
    };
  }

• src/index.ts:37-50 (schema)

  Tool definition including name, description, and input schema (requiring a 'content' string). This is used for validation and provided in listTools response.

  const ADD_POST_TOOL: Tool = {
    name: "add_post",
    description: "Adds a simple text post.",
    inputSchema: {
      type: "object",
      properties: {
        content: {
          type: "string",
          description: "The text content of the post to add.",
        },
      },
      required: ["content"],
    },
  };

• src/index.ts:77-82 (registration)

  The add_post tool (ADD_POST_TOOL) is registered in the SIMPLE_TOOLS array, which is returned by the listTools handler.

  const SIMPLE_TOOLS = [
    GET_WEATHER_TOOL,
    ADD_POST_TOOL,
    GET_POSTS_TOOL,
    DELETE_POST_TOOL,
  ] as const;

• src/index.ts:186-189 (registration)

  Dispatch case in the CallToolRequestSchema handler that extracts the 'content' argument and invokes the handleAddPost function.

  case "add_post": {
    const { content } = request.params.arguments as { content: string };
    return await handleAddPost(content);
  }