mcp: new API for features (#88)

BREAKING CHANGE

Change the API for adding tools, prompts, resources and resource
templates to a server.

The ServerXXX types are gone along with the plural Add methods
(AddTools, AddPrompts etc.)
Instead there are single Add methods (AddTool, AddPrompt).
In addition, instead of NewServerTool, there is AddTool[In, Out].

Fixes #73.

README.md

@@ -1,6 +1,21 @@
 <!-- Autogenerated by weave; DO NOT EDIT -->
 # MCP Go SDK
 
+***BREAKING CHANGES***
+
+The latest version contains breaking changes:
+
+- Server.AddTools is replaced by Server.AddTool.
+
+- NewServerTool is replaced by AddTool. AddTool takes a Tool rather than a name and description, so you can 
+  set any field on the Tool that you want before associating it with a handler.
+
+- Tool options have been removed. If you don't want AddTool to infer a JSON Schema for you, you can construct one
+  as a struct literal, or using any other code that suits you.
+
+- AddPrompts, AddResources and AddResourceTemplates are similarly replaced by singular methods which pair the
+  feature with a handler. The ServerXXX types have been removed.
+
 [![PkgGoDev](https://pkg.go.dev/badge/github.com/modelcontextprotocol/go-sdk)](https://pkg.go.dev/github.com/modelcontextprotocol/go-sdk)
 
 This repository contains an unreleased implementation of the official Go
@@ -99,7 +114,7 @@ import (
 )
 
 type HiParams struct {
-	Name string `json:"name"`
+	Name string `json:"name", mcp:"the name of the person to greet"`
 }
 
 func SayHi(ctx context.Context, cc *mcp.ServerSession, params *mcp.CallToolParamsFor[HiParams]) (*mcp.CallToolResultFor[any], error) {
@@ -111,11 +126,8 @@ func SayHi(ctx context.Context, cc *mcp.ServerSession, params *mcp.CallToolParam
 func main() {
 	// Create a server with a single tool.
 	server := mcp.NewServer("greeter", "v1.0.0", nil)
-	server.AddTools(
-		mcp.NewServerTool("greet", "say hi", SayHi, mcp.Input(
-			mcp.Property("name", mcp.Description("the name of the person to greet")),
-		)),
-	)
+
+	mcp.AddTool(server, &mcp.Tool{Name: "greet", Description: "say hi"}, SayHi)
 	// Run the server over stdin/stdout, until the client disconnects
 	if err := server.Run(context.Background(), mcp.NewStdioTransport()); err != nil {
 		log.Fatal(err)