3da831b0c9* mcp: move to 2025-06-18 schema Add types and fields for the latest MCP schema. The main challenge here was dealing with the presence of _meta fields on many types, like Tool, Prompt and Resource. - Distinguish between the _meta field of a request's params, which includes a progress token, from the _meta field on other types, which is simply a map. - Redefine GetMeta to return a pointer to the map. We wanted to avoid that, but I don't see a clean way to do so. An alternative would be to have GetMeta return a map, and SetMeta to set it. - Provide GetProgressToken for requests only (not notifications or other types). - Still to do: deal with the meta and annotation fields of ContentBlock, which are currently duplicated for Resource and ResourceContents. * Meta and progress token redesign
31 lines
882 B
Go
31 lines
882 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 mcp_test
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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 Example_progressMiddleware() {
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c := mcp.NewClient("test", "v1", nil)
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c.AddSendingMiddleware(addProgressToken[*mcp.ClientSession])
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_ = c
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}
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func addProgressToken[S mcp.Session](h mcp.MethodHandler[S]) mcp.MethodHandler[S] {
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return func(ctx context.Context, s S, method string, params mcp.Params) (result mcp.Result, err error) {
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if rp, ok := params.(mcp.RequestParams); ok {
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rp.SetProgressToken(nextProgressToken.Add(1))
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}
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return h(ctx, s, method, params)
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}
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}
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