c60a318d22Implements the client half of the SEP-2575 / `2026-06-30` protocol. This CL is client-only; server-side `server/discover` is still a `MethodNotFound` stub. ### Changes - **`server/discover` probe in `Client.Connect()`** (`client.go`). When the caller opts into `protocolVersion >= 2026-06-30`, the client probes the server with `server/discover` before falling back to the legacy `initialize` handshake. - **Per-request `_meta` injection** (`shared.go`, `injectRequestMeta`). For`>= 2026-06-30` sessions every outgoing request gets the SEP-2575 triple (`protocolVersion`, `clientInfo`, `clientCapabilities`). - **Server-side fix**: `ServerSession.handle` no longer pre-populates `state.InitializeParams` from a `server/discover` request's `_meta`, so a subsequent fallback `initialize` is not rejected as a duplicate. ### Fallback rules Client falls back to the legacy `initialize` handshake when discover returns: - `MethodNotFound` (-32601), - `UnsupportedProtocolVersionError` (-32004), - an HTTP `Bad Request` (substring-matched on the error message, to interop with pre-2026-06-30 servers). Fixes #966
40 lines
2.2 KiB
Go
40 lines
2.2 KiB
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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// This file holds the request types.
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package mcp
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type (
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CallToolRequest = ServerRequest[*CallToolParamsRaw]
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CompleteRequest = ServerRequest[*CompleteParams]
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GetPromptRequest = ServerRequest[*GetPromptParams]
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InitializedRequest = ServerRequest[*InitializedParams]
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ListPromptsRequest = ServerRequest[*ListPromptsParams]
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ListResourcesRequest = ServerRequest[*ListResourcesParams]
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ListResourceTemplatesRequest = ServerRequest[*ListResourceTemplatesParams]
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ListToolsRequest = ServerRequest[*ListToolsParams]
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ProgressNotificationServerRequest = ServerRequest[*ProgressNotificationParams]
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ReadResourceRequest = ServerRequest[*ReadResourceParams]
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RootsListChangedRequest = ServerRequest[*RootsListChangedParams]
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SubscribeRequest = ServerRequest[*SubscribeParams]
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UnsubscribeRequest = ServerRequest[*UnsubscribeParams]
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)
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type (
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CreateMessageRequest = ClientRequest[*CreateMessageParams]
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CreateMessageWithToolsRequest = ClientRequest[*CreateMessageWithToolsParams]
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DiscoverRequest = ClientRequest[*DiscoverParams]
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ElicitRequest = ClientRequest[*ElicitParams]
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initializedClientRequest = ClientRequest[*InitializedParams]
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InitializeRequest = ClientRequest[*InitializeParams]
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ListRootsRequest = ClientRequest[*ListRootsParams]
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LoggingMessageRequest = ClientRequest[*LoggingMessageParams]
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ProgressNotificationClientRequest = ClientRequest[*ProgressNotificationParams]
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PromptListChangedRequest = ClientRequest[*PromptListChangedParams]
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ResourceListChangedRequest = ClientRequest[*ResourceListChangedParams]
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ResourceUpdatedNotificationRequest = ClientRequest[*ResourceUpdatedNotificationParams]
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ToolListChangedRequest = ClientRequest[*ToolListChangedParams]
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ElicitationCompleteNotificationRequest = ClientRequest[*ElicitationCompleteParams]
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)
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