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| og:image:alt | Implements server-side support for the 2026-07-28 stateless streamable-HTTP path, removing server-stateless from the conformance expected-failures baseline (25/25 checks pass).
Part of #2891. Touch... |
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| #2891 | https://github.com/modelcontextprotocol/python-sdk/issues/2891 |
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Compare
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| June 20, 2026 17:15 | https://github.com/modelcontextprotocol/python-sdk/pull/2928#event-26994978780 |
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| S2 wave 0: conformance pin, classifier, discover handler, helpers, fi… | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/3c2a822ddeee952dd39b6e568eb9ede520bb2bc7 |
| 3c2a822 | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/3c2a822ddeee952dd39b6e568eb9ede520bb2bc7 |
| #337 | https://github.com/modelcontextprotocol/python-sdk/issues/337 |
| #2891 | https://github.com/modelcontextprotocol/python-sdk/issues/2891 |
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| https://github.com/maxisbey |
| S2 waves 1-3: driver-split kernel + two-channel ServerSession + class… | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/ff6610a83ff3e279d63f5024bf5177086e43e659 |
| ff6610a | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/ff6610a83ff3e279d63f5024bf5177086e43e659 |
| #2891 | https://github.com/modelcontextprotocol/python-sdk/issues/2891 |
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| https://github.com/maxisbey |
| S2 wave 4: modern entry rewrite, Server.run wrapper, test migrations | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/703cde13fe4af65ffd08441b29383e7595bed5f2 |
| 703cde1 | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/703cde13fe4af65ffd08441b29383e7595bed5f2 |
| #2891 | https://github.com/modelcontextprotocol/python-sdk/issues/2891 |
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| Client streamable-http: parse JSON-RPC errors from non-2xx response b… | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/1c3e8fcca2c81a39dd113f6fe3c2dfee0ca03686 |
| 1c3e8fc | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/1c3e8fcca2c81a39dd113f6fe3c2dfee0ca03686 |
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| Testing-standards fixes: hollow-proof, provenance docstrings, constan… | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/bbe0e8d87170b9748af0047099111c313a476737 |
| bbe0e8d | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/bbe0e8d87170b9748af0047099111c313a476737 |
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| Absorb | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/764650e62bdfd0cdda4b1282e24f1bf1fe7c266d |
| #2926 | https://github.com/modelcontextprotocol/python-sdk/pull/2926 |
| (SEP-2577 deprecations); fix client 4xx id-correlation | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/764650e62bdfd0cdda4b1282e24f1bf1fe7c266d |
| 764650e | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/764650e62bdfd0cdda4b1282e24f1bf1fe7c266d |
| #2926 | https://github.com/modelcontextprotocol/python-sdk/pull/2926 |
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| D8: move method-existence from classifier rung-4 to kernel dispatch | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/9470abf9eba33ac996b19cc991f8955bd9d4d69a |
| 9470abf | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/9470abf9eba33ac996b19cc991f8955bd9d4d69a |
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| Re-raise MCPError from @mcp.tool() handlers as a top-level JSON-RPC e… | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/723166408694773f23ec51995223ec75624982ab |
| 7231664 | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/723166408694773f23ec51995223ec75624982ab |
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| T3: interaction-suite additions for modern stateless entry | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/416c9d9807733611e32c178eda413bec0bae01a0 |
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| T5: coverage backfill for S2-added branches | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/e0f8ab9339b21e14f81990543b6b306573af2b19 |
| e0f8ab9 | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/e0f8ab9339b21e14f81990543b6b306573af2b19 |
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| https://github.com/maxisbey |
| Wave 5b polish + update tests for MCPError re-raise consequences | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/4a79c32de24893e1bd25bc81ae48af23cfd7a847 |
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| https://github.com/maxisbey |
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Compare
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| June 20, 2026 19:58 | https://github.com/modelcontextprotocol/python-sdk/pull/2928#event-26998186858 |
| maxisbey | https://github.com/maxisbey |
| June 20, 2026 20:16 | https://github.com/modelcontextprotocol/python-sdk/pull/2928#commits-pushed-078af46 |
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| Route unrecognised protocol-version headers to the modern entry; swap… | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/078af460e5766a8e6084d5dfe1fb72a917b400c9 |
| 078af46 | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/078af460e5766a8e6084d5dfe1fb72a917b400c9 |
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| https://github.com/maxisbey |
| Delete legacy transport's protocol-version validation (now owned by m… | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/bf0dd7f8c24f6c98e574c07b4cc31ba596c87a38 |
| bf0dd7f | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/bf0dd7f8c24f6c98e574c07b4cc31ba596c87a38 |
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| 644745c | https://github.com/modelcontextprotocol/python-sdk/commit/644745c9ab23029ce02433e2a8be5eece51a5272 |
| c94095c | https://github.com/modelcontextprotocol/python-sdk/commit/c94095cb03d525391a69aa91428108006c83e012 |
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Compare
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| June 20, 2026 20:22 | https://github.com/modelcontextprotocol/python-sdk/pull/2928#event-26998495312 |
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| https://github.com/maxisbey |
| C3: remove server-stateless from conformance baselines; C2: TODO-anch… | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/2313cde068a8e49957177ba9541f9621a0b22f2b |
| 2313cde | https://github.com/modelcontextprotocol/python-sdk/pull/2928/commits/2313cde068a8e49957177ba9541f9621a0b22f2b |
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| force-pushed | https://github.com/modelcontextprotocol/python-sdk/compare/c94095cb03d525391a69aa91428108006c83e012..2313cde068a8e49957177ba9541f9621a0b22f2b |
| c94095c | https://github.com/modelcontextprotocol/python-sdk/commit/c94095cb03d525391a69aa91428108006c83e012 |
| 2313cde | https://github.com/modelcontextprotocol/python-sdk/commit/2313cde068a8e49957177ba9541f9621a0b22f2b |
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Compare
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| June 20, 2026 20:28 | https://github.com/modelcontextprotocol/python-sdk/pull/2928#event-26998560950 |
| https://github.com/maxisbey |
| maxisbey | https://github.com/maxisbey |
| June 20, 2026 20:56 | https://github.com/modelcontextprotocol/python-sdk/pull/2928#event-26998890632 |
| https://github.com/apps/claude |
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Jun 20, 2026
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View reviewed changes
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| src/mcp/server/_streamable_http_modern.py | https://github.com/modelcontextprotocol/python-sdk/pull/2928/files/2313cde068a8e49957177ba9541f9621a0b22f2b#diff-c5e06136c127a1503b8eab18375355c38ceb7e71b5a1c04b36ebf2fbc3d9067d |
| Please reload this page | https://github.com/modelcontextprotocol/python-sdk/pull/2928 |
| docs/migration.md | https://github.com/modelcontextprotocol/python-sdk/pull/2928/files/2313cde068a8e49957177ba9541f9621a0b22f2b#diff-758ba107a728fccfdf0d098b2c06ded59127dd53ea287d630f72fb51040bc72d |
| Please reload this page | https://github.com/modelcontextprotocol/python-sdk/pull/2928 |
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View reviewed changes
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View reviewed changes
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Jun 20, 2026
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View reviewed changes
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Jun 22, 2026
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Client-side 2026-07-28 support: .discover()/.adopt() + Client(mode=); request-metadata green
#2950
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Implement SEP-1442: Make MCP Stateless
#1544
| https://github.com/modelcontextprotocol/python-sdk/issues/1544 |
|
Implement SEP-1724: Extensions
#1555
| https://github.com/modelcontextprotocol/python-sdk/issues/1555 |
|
Implement SEP-2260: Require Server requests to be associated with a Client request
#2796
| https://github.com/modelcontextprotocol/python-sdk/issues/2796 |
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Implement SEP-2567: Sessionless MCP via Explicit State Handles
#2803
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