wehub-resource-sync
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132 lines
2.5 KiB
Markdown
132 lines
2.5 KiB
Markdown
# MCP Hello World Example
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The simplest possible MCP-enabled go-micro service.
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## What This Shows
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- ✅ Automatic documentation extraction from Go comments
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- ✅ MCP gateway setup with 3 lines of code
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- ✅ Ready for Claude Code integration
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- ✅ HTTP endpoint for testing
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## Run It
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```bash
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cd examples/mcp/hello
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go run main.go
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```
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## Test It
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### Option 1: HTTP API
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```bash
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# List available tools
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curl http://localhost:3000/mcp/tools | jq
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# Call the SayHello tool
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curl -X POST http://localhost:3000/mcp/call \
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-H "Content-Type: application/json" \
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-d '{
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"tool": "greeter.Greeter.SayHello",
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"input": {"name": "Alice"}
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}' | jq
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```
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### Option 2: Claude Code
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In a separate terminal:
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```bash
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micro mcp serve
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```
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Add to `~/.claude/claude_desktop_config.json`:
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```json
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{
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"mcpServers": {
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"greeter": {
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"command": "micro",
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"args": ["mcp", "serve"]
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}
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}
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}
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```
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Restart Claude Code and ask:
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> "Say hello to Bob using the greeter service"
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## How It Works
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### 1. Write Normal Go Code
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```go
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// SayHello greets a person by name. Returns a friendly greeting message.
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//
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// @example {"name": "Alice"}
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func (g *Greeter) SayHello(ctx context.Context, req *HelloRequest, rsp *HelloResponse) error {
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rsp.Message = "Hello " + req.Name + "!"
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return nil
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}
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```
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### 2. Register the Handler
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```go
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// Documentation is extracted automatically!
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handler := service.Server().NewHandler(new(Greeter))
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service.Server().Handle(handler)
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```
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### 3. Start MCP Gateway
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```go
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go mcp.ListenAndServe(":3000", mcp.Options{
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Registry: service.Options().Registry,
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})
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```
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**That's it!** Your service is now AI-accessible.
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## What Gets Extracted
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From this code:
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```go
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// SayHello greets a person by name. Returns a friendly greeting message.
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//
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// @example {"name": "Alice"}
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func (g *Greeter) SayHello(...)
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type HelloRequest struct {
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Name string `json:"name" description:"Person's name to greet"`
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}
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```
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Claude sees:
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```json
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{
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"name": "greeter.Greeter.SayHello",
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"description": "SayHello greets a person by name. Returns a friendly greeting message.",
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"inputSchema": {
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"type": "object",
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"properties": {
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"name": {
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"type": "string",
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"description": "Person's name to greet"
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}
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},
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"examples": ["{\"name\": \"Alice\"}"]
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}
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}
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```
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## Next Steps
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- See `examples/mcp/documented` for a more complete example with multiple endpoints
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- Read `/docs/mcp.md` for full documentation
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- Check out the [MCP specification](https://modelcontextprotocol.io/)
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