Cleans read stream writers list

[rahulchittimalla]

Motivation and Context

Currently, there is no explicit cleanup of the session_id from the _read_stream_writers. When the connection closes (client disconnects) the code closes the streams, but does not remove the session_id key from _read_stream_writers dictionary when the connection is closed.

How Has This Been Tested?

Breaking Changes

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

[felixweinberger]

Hi @rahulchittimalla - thank you for your contribution! And apologies for the delay in getting back to you.

Could you provide some additional detail what problem you were running into without this? I understand the session_id not being removed from the _read_stream_writers but I'm curious whether this was actually causing any issues for you?

If this was causing bugs in production for you or if there's some reproducible problem as a result of this, would be great to add a test that demonstrates the broken behavior?

Happy to get back to this quickly if you have the bandwidth to update the PR here!

[felixweinberger]

Closing this one for now as it's been a while - we're currently going through older PRs to ensure we prioritize limited maintainer time appropriately.

Happy to reopen this if you come back to this at a later time to continue the discussion - in that case feel free to ping here.