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Pass session id's to MCP endpoints. (#466)

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* Pass session id's to MCP endpoints.

* Update src/ModelContextProtocol/Client/McpClient.cs

Co-authored-by: Stephen Halter <halter73@gmail.com>

* Update src/ModelContextProtocol.AspNetCore/StreamableHttpHandler.cs

Co-authored-by: Stephen Halter <halter73@gmail.com>

* Make init callback asynchronous.

* Address feedback.

---------

Co-authored-by: Stephen Halter <halter73@gmail.com>
This commit is contained in:
Eirik Tsarpalis 2025-06-12 16:56:57 +02:00 • committed by GitHub
commit d7d9eab3f8
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1 changed files with 166 additions and 21 deletions
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9
src/ModelContextProtocol.Core/Server/StreamableHttpPostTransport.cs
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@ -18,6 +18,8 @@ internal sealed class StreamableHttpPostTransport(StreamableHttpServerTransport
public ChannelReader<JsonRpcMessage> MessageReader => throw new NotSupportedException("JsonRpcMessage.RelatedTransport should only be used for sending messages.");
string? ITransport.SessionId => parentTransport.SessionId;
/// <returns>
/// True, if data was written to the respond body.
/// False, if nothing was written because the request body did not contain any <see cref="JsonRpcRequest"/> messages to respond to.
@ -79,10 +81,11 @@ internal sealed class StreamableHttpPostTransport(StreamableHttpServerTransport
{
_pendingRequest = request.Id;
// Store client capabilities so they can be serialized by "stateless" callers for use in later requests.
if (parentTransport.Stateless && request.Method == RequestMethods.Initialize)
// Invoke the initialize request callback if applicable.
if (parentTransport.OnInitRequestReceived is { } onInitRequest && request.Method == RequestMethods.Initialize)
{
parentTransport.InitializeRequest = JsonSerializer.Deserialize(request.Params, McpJsonUtilities.JsonContext.Default.InitializeRequestParams);
var initializeRequest = JsonSerializer.Deserialize(request.Params, McpJsonUtilities.JsonContext.Default.InitializeRequestParams);
await onInitRequest(initializeRequest).ConfigureAwait(false);
}
}