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mcp: new API for features (#88)

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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.
This commit is contained in:
Jonathan Amsterdam 2025-07-07 14:54:52 -04:00 • committed by GitHub
commit aebd244981
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2 changed files with 366 additions and 612 deletions
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24
examples/hello/main.go
View file

@ -19,7 +19,7 @@ import (
var httpAddr = flag.String("http", "", "if set, use streamable HTTP at this address, instead of stdin/stdout")
type HiArgs struct {
Name string `json:"name"`
Name string `json:"name" mcp:"the name to say hi to"`
}
func SayHi(ctx context.Context, ss *mcp.ServerSession, params *mcp.CallToolParamsFor[HiArgs]) (*mcp.CallToolResultFor[struct{}], error) {
@ -43,21 +43,13 @@ func main() {
flag.Parse()
server := mcp.NewServer("greeter", "v0.0.1", nil)
server.AddTools(mcp.NewServerTool("greet", "say hi", SayHi, mcp.Input(
mcp.Property("name", mcp.Description("the name to say hi to")),
)))
server.AddPrompts(&mcp.ServerPrompt{
Prompt: &mcp.Prompt{Name: "greet"},
Handler: PromptHi,
})
server.AddResources(&mcp.ServerResource{
Resource: &mcp.Resource{
Name: "info",
MIMEType: "text/plain",
URI: "embedded:info",
},
Handler: handleEmbeddedResource,
})
mcp.AddTool(server, &mcp.Tool{Name: "greet", Description: "say hi"}, SayHi)
server.AddPrompt(&mcp.Prompt{Name: "greet"}, PromptHi)
server.AddResource(&mcp.Resource{
Name: "info",
MIMEType: "text/plain",
URI: "embedded:info",
}, handleEmbeddedResource)
if *httpAddr != "" {
handler := mcp.NewStreamableHTTPHandler(func(*http.Request) *mcp.Server {

6
examples/sse/main.go
View file

@ -35,12 +35,12 @@ func main() {
}
server1 := mcp.NewServer("greeter1", "v0.0.1", nil)
server1.AddTools(mcp.NewServerTool("greet1", "say hi", SayHi))
mcp.AddTool(server1, &mcp.Tool{Name: "greet1", Description: "say hi"}, SayHi)
server2 := mcp.NewServer("greeter2", "v0.0.1", nil)
server2.AddTools(mcp.NewServerTool("greet2", "say hello", SayHi))
mcp.AddTool(server2, &mcp.Tool{Name: "greet2", Description: "say hello"}, SayHi)
log.Printf("MCP servers serving at %s\n", *httpAddr)
log.Printf("MCP servers serving at %s", *httpAddr)
handler := mcp.NewSSEHandler(func(request *http.Request) *mcp.Server {
url := request.URL.Path
log.Printf("Handling request for URL %s\n", url)