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Support stream resumption in stateless mode

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Feature
Clarity
Needs clarification
Activity status
Stale
Tech stack
csharp

Research direction

Start by tracing ISseEventStreamStore, session lifetime handling in stateless mode, and the message processing loop described in the issue. Done means sessions remain available after the POST completes, new messages reach the transport, and those messages are written to the event stream store for resumption.

Written by the indexing model from the issue text.

Description

enhancement needs confirmation P3

There are some changes we need to make outside the implementation of ISseEventStreamStore. For example, in stateless mode, sessions currently get disposed immediately when the POST request completes. This causes the message processing loop to stop, which means new messages never reach the transport and never get written to the event stream store. So, we'd need to revisit the behavior around session lifetimes in stateless mode. I could probably do that in this PR, but it's already quite large and I figured leaving out stateless mode support for now could be a way to scope things down. If you think it should be included in this PR, I could go ahead and try to get it working.

Originally posted by @MackinnonBuck in https://github.com/modelcontextprotocol/csharp-sdk/pull/1077#discussion_r2669879747

Dominant language
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Merged PRs (30d)
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