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• ClientSessionGroup leaves old tools after disconnecting a re-registered session

  skipped:
  Docs Preview#1900:Issue comment#3713 (comment)createdbyabhay-2108
  Oct 15, 20262s
  More actions for workflow run 1900

• Refresh session components on re-registration in ClientSessionGroup

  completed successfully:
  Docs Preview#1899:Pull request#3716openedbyabhay-2108
  Oct 15, 202610s
  More actions for workflow run 1899

• ClientSessionGroup leaves old tools after disconnecting a re-registered session

  skipped:
  Docs Preview#1898:Issue comment#3713 (comment)createdbyabhay-2108
  Oct 15, 20261s
  More actions for workflow run 1898

• DPoP sender-constrained tokens not implemented in OAuth client (spec mandates it)

  skipped:
  Docs Preview#1897:Issue comment#3671 (comment)createdbyeaakun
  Oct 15, 20261s
  More actions for workflow run 1897

• AuthSettings.issuer_url is required in resource-server-only mode but never used

  skipped:
  Docs Preview#1896:Issue comment#3702 (comment)createdbysattyamjjain
  Oct 15, 20268s
  More actions for workflow run 1896

• Ordinary-class structured outputs discard Annotated field constraints and accept invalid values

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  Docs Preview#1895:Issue comment#3712 (comment)createdbysattyamjjain
  Oct 15, 20262s
  More actions for workflow run 1895

• Ordinary-class structured outputs discard Annotated field constraints and accept invalid values

  skipped:
  Docs Preview#1894:Issue comment#3712 (comment)createdbydhvani7014
  Oct 15, 20262s
  More actions for workflow run 1894

• A synchronous prompt callback returning Awaitable is rendered as coroutine text

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  Docs Preview#1893:Issue comment#3709 (comment)createdbyleninworld
  Oct 15, 202611s
  More actions for workflow run 1893

• FuncMetadata.pre_parse_json mis-detects str | None as non-string and corrupts JSON-looking string arguments

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  Docs Preview#1892:Issue comment#3055 (comment)createdbyinanna-malick
  Oct 14, 20262s
  More actions for workflow run 1892

• ClientSessionGroup raises KeyError when a server exposes no tools, resources or prompts

  skipped:
  Docs Preview#1891:Issue comment#3384 (comment)createdbyinanna-malick
  Oct 14, 20262s
  More actions for workflow run 1891

• Generated output schema uses Pydantic's validation shape while structured output uses its serialization shape

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  Docs Preview#1890:Issue comment#3100 (comment)createdbyinanna-malick
  Oct 14, 20261s
  More actions for workflow run 1890

• dict[str, T] tool return types lose Annotated/Field metadata in output schema

  skipped:
  Docs Preview#1889:Issue comment#2935 (comment)createdbyinanna-malick
  Oct 14, 20267s
  More actions for workflow run 1889

• Prompt handlers returning UserList are rendered as one text message

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  Docs Preview#1888:Issue comment#3643 (comment)createdbyinanna-malick
  Oct 14, 20262s
  More actions for workflow run 1888

• A tool with a *args or **kwargs parameter is registered with a schema it can never satisfy

  skipped:
  Docs Preview#1887:Issue comment#3514 (comment)createdbyinanna-malick
  Oct 14, 20264s
  More actions for workflow run 1887

• Field alias is published in the tool schema but forwarded as an invalid Python keyword

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  Docs Preview#1886:Issue comment#3099 (comment)createdbyinanna-malick
  Oct 14, 20262s
  More actions for workflow run 1886

• A lone surrogate in an outgoing message silently kills the stdio server's writer or the client session

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  Docs Preview#1885:Issue comment#3707 (comment)createdbynaveecode
  Oct 14, 20263s
  More actions for workflow run 1885

• Client SSRF / protocol confusion: streamable HTTP transport follows server 3xx into internal+loopback services (follow_redirects=True, no host validation; #2106 closed but fix #2180 never merged)

  skipped:
  Docs Preview#1884:Issue comment#3358 (comment)createdbytrickyfalcon
  Oct 14, 20262s
  More actions for workflow run 1884

• 2026-07-28 SSE responses share one header list, so in-place middleware appends leak across responses

  skipped:
  Docs Preview#1883:Issue comment#3701 (comment)createdbyer-s-an
  Oct 14, 20261s
  More actions for workflow run 1883

• AuthSettings.issuer_url is required in resource-server-only mode but never used

  skipped:
  Docs Preview#1882:Issue comment#3702 (comment)createdbylzif
  Oct 14, 20261s
  More actions for workflow run 1882

• stdio_client: receiving a large response takes quadratic time (buffer + chunk is re-copied for every chunk)

  skipped:
  Docs Preview#1881:Issue comment#3699 (comment)createdbymaxiaochaos
  Oct 14, 20262s
  More actions for workflow run 1881

• OAuth token refresh hits the wrong endpoint when the auth server lives under a path

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  Docs Preview#1880:Issue comment#3240 (comment)createdbyzsxh1990
  Oct 14, 20261s
  More actions for workflow run 1880

• stdio_client: receiving a large response takes quadratic time (buffer + chunk is re-copied for every chunk)

  skipped:
  Docs Preview#1879:Issue comment#3699 (comment)createdbyBruceWayne733
  Oct 14, 20261s
  More actions for workflow run 1879

• 401 in Streamable HTTP should be handled gracefully

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  Docs Preview#1878:Issue comment#1295 (comment)createdbyKludex
  Oct 14, 20262s
  More actions for workflow run 1878

• bug(client/streamable_http): prevent infinite SSE reconnect loops with bounded exponential backoff

  skipped:
  Docs Preview#1877:Issue comment#3356 (comment)createdbyKludex
  Oct 14, 20269s
  More actions for workflow run 1877

• McpError is not pickle-safe and fails to unpickle

  skipped:
  Docs Preview#1876:Issue comment#2431 (comment)createdbyKludex
  Oct 14, 20262s
  More actions for workflow run 1876