go-micro/examples/mcp/platform

Platform Example: AI Agents Meet Real Microservices

This example mirrors the micro/blog platform — a real microblogging application built on Go Micro. It demonstrates how existing microservices become AI-accessible through MCP with zero changes to business logic.

Services

Service	Endpoints	Description
Users	Signup, Login, GetProfile, UpdateStatus, List	Account management and authentication
Posts	Create, Read, Update, Delete, List, TagPost, UntagPost, ListTags	Blog posts with markdown and tagging
Comments	Create, List, Delete	Threaded comments on posts
Mail	Send, Read	Internal messaging between users

Running

go run .

MCP tools available at: http://localhost:3001/mcp/tools

Agent Scenarios

These are realistic multi-step workflows an AI agent can complete:

1. New User Onboarding

"Sign up a new user called carol, then write a welcome post introducing herself"

The agent will: call Signup → use the returned user ID → call Posts.Create

2. Content Creation

"Log in as alice and write a blog post about Go concurrency patterns, then tag it with 'golang' and 'concurrency'"

The agent will: call Login → call Posts.Create → call TagPost twice

3. Social Interaction

"List all posts, find the welcome post, and comment on it as bob saying 'Great to be here!'"

The agent will: call Posts.List → pick the right post → call Comments.Create

4. Cross-Service Workflow

"Send a mail from alice to bob welcoming him, then check bob's inbox to confirm delivery"

The agent will: call Mail.Send → call Mail.Read to verify

5. Platform Overview

"Show me all users, all posts, and all tags currently in use"

The agent will: call Users.List, Posts.List, and ListTags (potentially in parallel)

How It Works

The key insight: you don't need to write any agent-specific code. The MCP gateway discovers services from the registry, extracts tool schemas from Go types, and generates descriptions from doc comments.

service := micro.New("platform",
    micro.Address(":9090"),
    mcp.WithMCP(":3001"),  // This one line makes everything AI-accessible
)

service.Handle(&Users{})
service.Handle(&Posts{})
service.Handle(&Comments{})
service.Handle(&Mail{})

Each handler method becomes an MCP tool. The @example tags in doc comments give agents sample inputs to learn from.

Connecting to Claude Code

Add to your Claude Code MCP config:

{
  "mcpServers": {
    "platform": {
      "command": "curl",
      "args": ["-s", "http://localhost:3001/mcp/tools"]
    }
  }
}

Or use stdio transport:

micro mcp serve --registry mdns

Architecture

Agent (Claude, GPT, etc.)
    │
    ▼
MCP Gateway (:3001)         ← Discovers services, generates tools
    │
    ▼
Go Micro RPC (:9090)        ← Standard service mesh
    │
    ├── UserService          ← Signup, Login, Profile
    ├── PostService          ← CRUD + Tags
    ├── CommentService       ← Threaded comments
    └── MailService          ← Internal messaging

Relation to micro/blog

This example is a simplified, self-contained version of micro/blog. The real platform splits each service into its own binary with protobuf definitions. This example uses Go structs directly for simplicity, but the MCP integration works identically either way — the gateway discovers services from the registry regardless of how they're implemented.