30 lines
860 B
Go
30 lines
860 B
Go
// Copyright 2025 The Go MCP SDK Authors. All rights reserved.
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// Use of this source code is governed by an MIT-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"context"
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"sync/atomic"
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"github.com/modelcontextprotocol/go-sdk/mcp"
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)
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var nextProgressToken atomic.Int64
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// This middleware function adds a progress token to every outgoing request
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// from the client.
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func main() {
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c := mcp.NewClient(&mcp.Implementation{Name: "test"}, nil)
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c.AddSendingMiddleware(addProgressToken[*mcp.ClientSession])
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}
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func addProgressToken[S mcp.Session](h mcp.MethodHandler) mcp.MethodHandler {
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return func(ctx context.Context, method string, req mcp.Request) (result mcp.Result, err error) {
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if rp, ok := req.GetParams().(mcp.RequestParams); ok {
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rp.SetProgressToken(nextProgressToken.Add(1))
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}
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return h(ctx, method, req)
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}
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}
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