e1c17e047fAdd four new example servers demonstrating different SEP-2053 variant patterns: - model-optimized (same tools, different descriptions per LLM family) - trading (API versioning with deprecation lifecycle) - research (context budget management) - Refactor the existing variants-http example into a GitHub-style server with custom ranking. Signed-off-by: Kurt Degiorgio <kdegiorgio@bloomberg.net>
47 lines
1.2 KiB
Go
47 lines
1.2 KiB
Go
// Example: Minimal variant-aware MCP server over stdio. Registers a single
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// variant with one tool to demonstrate the simplest possible setup.
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//
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// Run over stdio:
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//
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// go run ./examples/server/variants-stdio
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package main
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import (
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"context"
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"log"
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"github.com/modelcontextprotocol/go-sdk/mcp"
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"github.com/modelcontextprotocol/experimental-ext-variants/go/sdk/variants"
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)
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type GreetInput struct {
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Name string `json:"name" jsonschema:"name to greet"`
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}
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type GreetOutput struct {
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Message string `json:"message"`
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}
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func greet(_ context.Context, _ *mcp.CallToolRequest, in GreetInput) (*mcp.CallToolResult, GreetOutput, error) {
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return nil, GreetOutput{Message: "Hello, " + in.Name + "!"}, nil
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}
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func main() {
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inner := mcp.NewServer(&mcp.Implementation{Name: "greeter", Version: "v1.0.0"}, nil)
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mcp.AddTool(inner, &mcp.Tool{
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Name: "greet",
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Description: "Greet someone by name",
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}, greet)
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vs := variants.NewServer(&mcp.Implementation{Name: "greeter", Version: "v1.0.0"}).
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WithVariant(variants.ServerVariant{
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ID: "default",
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Description: "Default greeting variant.",
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Status: variants.Stable,
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}, inner, 0)
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if err := vs.Run(context.Background(), &mcp.StdioTransport{}); err != nil {
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log.Fatal(err)
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}
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}
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