Amazon VPC Lattice MCP Server

Instructions

Implementation Reference

• src/tools.ts:144-163 (handler)

  Handler logic for the 'get_source_prompts' tool. It takes source_name from arguments, looks up the source in the sources array, and returns the source's prompts as a JSON-formatted text response. Throws error if source not found.

  case 'get_source_prompts': {
    const { source_name } = request.params.arguments as { source_name: string };
    const source = sources.find(s => s.name === source_name);
    
    if (!source) {
      throw new McpError(
        ErrorCode.InvalidParams,
        `Source not found: ${source_name}`
      );
    }
  
    return {
      content: [
        {
          type: 'text',
          text: JSON.stringify(source.prompts, null, 2)
        }
      ]
    };
  }

• src/tools.ts:28-38 (schema)

  Input schema definition for the 'get_source_prompts' tool, specifying that it requires a 'source_name' string parameter.

  inputSchema: {
    type: 'object',
    properties: {
      source_name: {
        type: 'string',
        description: 'Name of the source to get prompts for'
      }
    },
    required: ['source_name'],
    additionalProperties: false
  },

• src/tools.ts:25-39 (registration)

  Tool registration entry in the exported 'tools' array, including name, description, and input schema. This array is used by the MCP server to list available tools.

  {
    name: 'get_source_prompts',
    description: 'Get sample prompts for a specific source',
    inputSchema: {
      type: 'object',
      properties: {
        source_name: {
          type: 'string',
          description: 'Name of the source to get prompts for'
        }
      },
      required: ['source_name'],
      additionalProperties: false
    },
  },

• src/data/sources.ts:1-27 (helper)

  Supporting data file providing the 'sources' array with source names, URLs, and sample prompts used by the get_source_prompts handler.

  export const sources = [
    {
      name: 'AWS Documentation',
      url: 'https://docs.aws.amazon.com',
      prompts: [
        'What are the key features of {service}?',
        'How do I configure {service} for {use_case}?',
        'What are the best practices for using {service}?'
      ]
    },
    {
      name: 'AWS Gateway API Controller for VPC Lattice',
      url: 'https://github.com/aws/aws-application-networking-k8s',
      prompts: [
        'Does the EKS controller support {feature}',
        'Show me {type} issues in the EKS controller repo'
      ]
    },
    {
      name: 'Kubernetes Gateway API',
      url: 'https://gateway-api.sigs.k8s.io/',
      prompts: [
        'Fix error: {error_message}',
        'Best practices for {resource}'
      ]
    }
  ];

• src/index.ts:36-38 (registration)

  MCP server request handler for listing tools, returning the 'tools' array which includes get_source_prompts.

  this.server.setRequestHandler(ListToolsRequestSchema, async () => ({
    tools,
  }));