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Title: fix: propagate SSE stream errors to waiting requests by heyhayes · Pull Request #2122 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: propagate SSE stream errors to waiting requests by heyhayes · Pull Request #2122 · modelcontextprotocol/python-sdk

X Title: fix: propagate SSE stream errors to waiting requests by heyhayes · Pull Request #2122 · modelcontextprotocol/python-sdk

Description: The official Python SDK for Model Context Protocol servers and clients - fix: propagate SSE stream errors to waiting requests by heyhayes · Pull Request #2122 · modelcontextprotocol/python-sdk

Open Graph Description: Summary Fixes #1401. Also fixes #1789 (closed as duplicate). When an SSE read timeout occurs during a StreamableHTTP POST request, the pending send_request call hangs indefinitely. The transport ca...

X Description: Summary Fixes #1401. Also fixes #1789 (closed as duplicate). When an SSE read timeout occurs during a StreamableHTTP POST request, the pending send_request call hangs indefinitely. The transport ca...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2122

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Feb 21, 2026https://github.com/modelcontextprotocol/python-sdk/pull/2122#issue-3972014866
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#1401https://github.com/modelcontextprotocol/python-sdk/issues/1401
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fix: change _handle_reconnection to return bool and fix infinite recu…https://github.com/modelcontextprotocol/python-sdk/pull/2122/commits/ddd2a378a6c1273594ec21dff8c37cda0ab2e1ac
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fix: propagate error when SSE stream ends without a responsehttps://github.com/modelcontextprotocol/python-sdk/pull/2122/commits/75cd668aa8dd8a67a673b1dc5315dd9f88c719de
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modelcontextprotocol#1401https://github.com/modelcontextprotocol/python-sdk/issues/1401
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fix: stop infinite GET stream reconnection on repeated empty connectionshttps://github.com/modelcontextprotocol/python-sdk/pull/2122/commits/0efb39253a245d0edb69c43311adb0e558e3ac30
0efb392https://github.com/modelcontextprotocol/python-sdk/pull/2122/commits/0efb39253a245d0edb69c43311adb0e558e3ac30
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Log warning for unhandled exceptions in default message handlerhttps://github.com/modelcontextprotocol/python-sdk/pull/2122/commits/ae0bc81a22ba997a2de1eac6c6fd83b58594f37d
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February 21, 2026 13:51https://github.com/modelcontextprotocol/python-sdk/pull/2122#event-22968641037
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test: cover branch where reconnection exhausts max attemptshttps://github.com/modelcontextprotocol/python-sdk/pull/2122/commits/f0af07e10e3b7fb6333806468532089ff5edf03a
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February 21, 2026 14:07https://github.com/modelcontextprotocol/python-sdk/pull/2122#event-22968792156
ClientSession Error Handling #1401 https://github.com/modelcontextprotocol/python-sdk/issues/1401
fix: handle_sse_response causing dangling client's read_stream #1812 https://github.com/modelcontextprotocol/python-sdk/pull/1812
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fix: Raise exceptions in default ClientSession message handler (#1401) #1595 https://github.com/modelcontextprotocol/python-sdk/pull/1595
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Mar 29, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2122#ref-pullrequest-4162045587
fix(session): log exceptions in default message_handler instead of silently swallowing #2374 https://github.com/modelcontextprotocol/python-sdk/pull/2374
fix: send error to client when SSE stream disconnects without response #1949 https://github.com/modelcontextprotocol/python-sdk/pull/1949
Fix SSE timeout hang by propagating transport exceptions to pending r… #2430 https://github.com/modelcontextprotocol/python-sdk/pull/2430
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Jun 25, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2122#ref-pullrequest-4296832206
fix(client): propagate SSE POST errors to caller instead of hanging (#2110) #2483 https://github.com/modelcontextprotocol/python-sdk/pull/2483
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Jul 10, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2122#ref-pullrequest-4858030366
fix: stop the standalone GET stream reconnecting forever on empty connections #3087 https://github.com/modelcontextprotocol/python-sdk/pull/3087
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