Go Micro

Go Micro is a framework for building agents and services in Go.

Build an agent and it gets a model, memory, and tools, manages your services, and is reachable over MCP and A2A. Write services and they register, discover each other, and every endpoint is automatically an AI-callable tool. Orchestrate the deterministic parts with flows. Agents, services, and flows are all Go code — the same primitives, the same deployment — because an agent is a distributed system, and building one is building a service.

Sponsors

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Contents

• Quick Start
• Writing Services
• Building Agents — Plan & Delegate, Pluggable, Paid tools (x402), A2A
• Features
• CLI
• Multi-Service Projects
• Data Model
• AI Providers
• Examples
• Docs

Quick Start

Install the CLI:

# Binary (no Go required)
curl -fsSL https://go-micro.dev/install.sh | sh

# Or with Go
go install go-micro.dev/v6/cmd/micro@latest

Fastest start — no API key

Scaffold a service, run it, call it:

micro new helloworld
cd helloworld
micro run

Then in another terminal:

curl -X POST http://localhost:8080/api/helloworld/Helloworld.Call \
  -H 'Content-Type: application/json' -d '{"name":"World"}'

Generate from a prompt — with an LLM key

Set a provider key, describe what you want, and the AI designs services, writes handlers, compiles, and starts them:

export ANTHROPIC_API_KEY=sk-ant-...   # or OPENAI_API_KEY, GEMINI_API_KEY, ...
micro run --prompt "a task management system with categories" --provider anthropic

The AI designs the architecture, you review it, then it generates handlers with real business logic, compiles them, and starts them:

Services:
  ● task — Task management with status tracking
  ● project — Project organization

Generate? [Y/n]

Micro
  Services:
    ● task
    ● project
  Agents:
    ◆ agent

Then talk to your services from the console:

> Create a project called Launch, then add three tasks to it

→ project_Project_Create({"name":"Launch"})
← {"record":{"id":"p1..."},"success":true}
→ task_Task_Create({"title":"Design specs","project_id":"p1..."})
→ task_Task_Create({"title":"Write code","project_id":"p1..."})
→ task_Task_Create({"title":"Ship it","project_id":"p1..."})

Created Work category and added 'Finish report' task to it.

When you need a capability that doesn't exist, the agent generates a new service mid-conversation:

> I need to track shipping. Create a shipment for order 123 to London.

  ⚡ generating shipping service...
  ✓ shipping
  → shipping_Shipping_Create({"order_id":"123","destination":"London"})
  ← {"record":{"id":"xyz...","status":"pending"}}

  Created shipment for order 123 going to London.

Edit the generated code by hand at any time — re-running preserves your changes. Read more.

Writing Services

Under the hood, a service is a struct with methods. Doc comments and @example tags become tool descriptions for AI agents automatically.

package main

import (
    "go-micro.dev/v6"
)

type Request struct {
    Name string `json:"name"`
}

type Response struct {
    Message string `json:"message"`
}

type Say struct{}

// Hello greets a person by name.
// @example {"name": "Alice"}
func (h *Say) Hello(ctx context.Context, req *Request, rsp *Response) error {
    rsp.Message = "Hello " + req.Name
    return nil
}

func main() {
    service := micro.NewService("greeter")
    service.Handle(new(Say))
    service.Run()
}

Run it and everything is accessible — REST, gRPC, MCP, agent playground:

micro run
# Dashboard:   http://localhost:8080
# API:         http://localhost:8080/api/{service}/{method}
# Agent:       http://localhost:8080/agent
# MCP Tools:   http://localhost:8080/mcp/tools

You can also scaffold a service from a template:

micro new helloworld
micro new contacts --template crud

Building Agents

An Agent is a service with an LLM inside it. It has a proto-defined Agent.Chat RPC endpoint, registers in the registry, and is callable like any service:

agent := micro.NewAgent("task-mgr",
    micro.AgentServices("task", "project"),
    micro.AgentPrompt("You manage tasks and projects. You understand deadlines and priorities."),
    micro.AgentProvider("anthropic"),
)
agent.Run()

The agent discovers its services from the registry, scopes its tools to their endpoints, and maintains conversation memory in the store. It registers itself so micro chat and other agents can find it.

// Programmatic interaction
resp, _ := agent.Ask(ctx, "What tasks are overdue?")
fmt.Println(resp.Reply)

Multiple agents coordinate via RPC — each is a service with an Agent.Chat endpoint. micro chat routes to the right one.

micro agent list                    # list registered agents
micro call task-mgr Agent.Chat '{"message": "What tasks are overdue?"}'

Plan & Delegate

Every agent gets two built-in capabilities, exposed as tools — no extra setup, no harness:

• plan — for multi-step work, the agent records an ordered plan in its store-backed memory and stays oriented across turns.
• delegate — the agent hands a self-contained subtask to another agent. If a registered agent already owns the relevant services, the hand-off goes over RPC to that agent; otherwise a focused, short-lived sub-agent is created for the subtask with its own isolated context.

This keeps intelligence distributed: an agent doesn't need to know how to do everything, only who does. See examples/agent-plan-delegate.

// A sub-agent is just an agent — created with New, talked to with Ask.
// delegate-first: reuse a registered agent, or spin up a focused one.
resp, _ := agent.Ask(ctx, "Plan the launch, create the tasks, and have comms notify the owner.")

Batteries included, pluggable

Just as a service composes pluggable abstractions (registry, broker, store), an agent composes a model, memory, and tools — sane defaults out of the box, each swappable.

agent := micro.NewAgent("assistant",
    micro.AgentProvider("anthropic"),                 // model — swap the provider
    micro.AgentMemory(micro.NewInMemory(50)),         // memory — default is store-backed & durable
    micro.AgentTool("weather", "Get the weather for a city",
        map[string]any{"city": map[string]any{"type": "string"}},
        func(ctx context.Context, in map[string]any) (string, error) {
            return getWeather(in["city"].(string))    // tools beyond your services — any function
        }),
    micro.AgentMaxSteps(8),                            // guardrails
)

Memory is durable and store-backed by default (Postgres, NATS KV, or file), so an agent picks up where it left off after a restart — or supply your own with AgentMemory. Tools are your services automatically, plus any function you register with AgentTool.

Paid tools (x402)

Every endpoint is an AI-callable tool — and it can be a paid tool. Go Micro supports x402, the HTTP 402 payment standard for agents, so a tool can require a stablecoin payment and an agent can settle it autonomously. It's opt-in and carries no crypto in the framework: verification is delegated to a pluggable facilitator (Coinbase, Alchemy, self-hosted), so Base and Solana are just different facilitators.

# Charge for tool calls at the MCP gateway (off unless you set a pay-to address)
micro mcp serve --x402-pay-to 0xYourAddress --x402-network solana --x402-amount 10000
# Per-tool amounts via a config file
micro mcp serve --x402-config x402.json

See the Payments (x402) guide.

Reachable by other agents (A2A)

Within a Go Micro system, agents reach each other over RPC. To make them reachable by agents on other frameworks, Go Micro speaks the Agent2Agent (A2A) protocol. The A2A gateway discovers your agents from the registry, generates an Agent Card for each from its metadata — the same way the MCP gateway derives tools from service endpoints — and translates incoming A2A tasks to the agent's Agent.Chat RPC. No per-agent code: register an agent and it's reachable over A2A.

micro a2a serve --address :4000    # gateway: expose every registered agent over A2A
micro a2a list                     # agents and their Agent Card URLs

Or skip the gateway entirely — an agent can serve its own A2A endpoint directly, handling tasks in-process:

micro.NewAgent("task-mgr", micro.AgentServices("task"), micro.AgentA2A(":4000"))

It works both ways. To call an agent on another framework, an a2a.Client is wired into the two places that hand off work: flow.A2A(url) as a workflow step (the cross-framework Dispatch), and delegate to an http(s) URL from inside an agent.

MCP exposes your services as tools; A2A exposes your agents as agents. See the A2A guide.

Features

AI

Framework

Developer experience & deployment

CLI

Multi-Service Projects

Run multiple services together:

users := micro.NewService("users", micro.Address(":9001"))
orders := micro.NewService("orders", micro.Address(":9002"))

users.Handle(new(Users))
orders.Handle(new(Orders))

g := micro.NewGroup(users, orders)
g.Run()

Or use a micro.mu config file:

service users
    path ./users

service orders
    path ./orders
    depends users

Data Model

Typed persistence with CRUD and queries:

type User struct {
    ID    string `json:"id" model:"key"`
    Name  string `json:"name"`
    Email string `json:"email" model:"index"`
}

db := service.Model()
db.Register(&User{})
db.Create(ctx, &User{ID: "1", Name: "Alice", Email: "[email protected]"})

var results []*User
db.List(ctx, &results, model.Where("email", "[email protected]"))

Backends: memory (default), SQLite, Postgres.

AI Providers

Swap providers with a single import — same interface everywhere:

m := ai.New("anthropic", ai.WithAPIKey(key))
resp, _ := m.Generate(ctx, &ai.Request{Prompt: "hello"})

Examples

• hello-world — Basic RPC service
• multi-service — Multiple services in one binary
• mcp — MCP integration with AI agents
• agent-plan-delegate — Agent planning and multi-agent delegation
• grpc-interop — Call go-micro from any gRPC client

See all examples.

Docs

• Getting Started
• AI Integration
• Agents and Workflows
• Agent Design
• Plan & Delegate
• Agent Guardrails
• Payments (x402)
• MCP & AI Agents
• Data Model
• Deployment
• Plugins

Package reference: https://pkg.go.dev/go-micro.dev/v6