AWS MCP Server

Instructions

Implementation Reference

• src/index.ts:1940-1953 (handler)

  Handler implementation for the 'list_target_groups' tool. Calls AWS ELBv2 DescribeTargetGroupsCommand, optionally filtered by LoadBalancerArn, and maps the response to a simplified JSON output.

  if (name === "list_target_groups") {
      const lbArn = (args as any)?.load_balancer_arn;
      const command = new DescribeTargetGroupsCommand(lbArn ? { LoadBalancerArn: lbArn } : {});
      const response = await elbv2Client.send(command);
      const tgs = response.TargetGroups?.map(tg => ({
          TargetGroupName: tg.TargetGroupName,
          Protocol: tg.Protocol,
          Port: tg.Port,
          TargetType: tg.TargetType,
          TargetGroupArn: tg.TargetGroupArn,
          LoadBalancerArns: tg.LoadBalancerArns
      })) || [];
      return { content: [{ type: "text", text: JSON.stringify(tgs, null, 2) }] };
  }

• src/index.ts:565-577 (registration)

  Tool registration in the ListTools handler, defining the tool name, description, and input schema for 'list_target_groups'.

  {
      name: "list_target_groups",
      description: "Lists all Target Groups.",
      inputSchema: {
          type: "object",
          properties: {
              load_balancer_arn: {
                  type: "string",
                  description: "Optional: Filter by Load Balancer ARN."
              }
          }
      }
  },

• src/index.ts:565-577 (schema)

  Input schema definition for the 'list_target_groups' tool, specifying optional load_balancer_arn parameter.

  {
      name: "list_target_groups",
      description: "Lists all Target Groups.",
      inputSchema: {
          type: "object",
          properties: {
              load_balancer_arn: {
                  type: "string",
                  description: "Optional: Filter by Load Balancer ARN."
              }
          }
      }
  },