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1. Commits on Oct 2, 2026

   • Stop counting an interactive OAuth login against request timeouts (#3635)

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   • Look the tool schema up by name for Mcp-Param-* validation instead of running tools/list (#3630)

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   • Retry a tool call once after a HeaderMismatch rejection (#3627)

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   • Record JSON-RPC error responses on the client OpenTelemetry span (#3629)

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   • Omit an empty _meta and empty params from outbound requests (#3628)

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   • Document how a handler deals with cancellation (#3625)

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   • Let MCPServer opt out of serving subscriptions/listen (#3626)

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   • Describe the ID-JAG confidential-client rule as SDK policy, not a SEP-990 requirement (#3622)

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   • Keep the live Context when a prompt or template annotates Context[T] (#3624)

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   • Contain a raising progress callback on the in-process dispatcher (#3623)

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   • Validate an explicit null structuredContent against the output schema (#3621)

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   • Reject a tool with an invalid x-mcp-header annotation at registration (#3620)

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   • Document the timeout a hand-built httpx2 client needs (#3618)

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   • Omit an unset experimental capability from the initialize result (#3614)

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   • docs: add a middleware tutorial that refuses tool calls (#3613)

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2. Commits on Oct 1, 2026

   • Expose an SSE event size limit in Streamable HTTP clients (#3600)

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   • Fall back to an NTFS junction when the symlink escape test can't create a symlink (#3609)

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   • Make the deeply nested body test independent of stack size (#3610)

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   • Bump anyio from 4.10.0 to 4.14.2 (#3547)

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     Kludex

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3. Commits on Sep 16, 2026

   • Detect event-loop blocking in tests (#3510)

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4. Commits on Sep 7, 2026

   • Replace RootModel wrappers with type aliases and TypeAdapter validation (#3470)

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   • docs: refresh translations, and translate pages in parallel (#3458)

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5. Commits on Sep 5, 2026

   • docs: stop presenting the in-memory client as the way to connect (#3443)

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   • Add AuthSettings.validate_token_resource to check a bearer token's resource (#3447)

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   • Keep following a relative redirect when the endpoint URL carries userinfo (#3450)

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   • Bump the locked versions of eight dev and test dependencies (#3449)

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6. Commits on Sep 4, 2026

   • Follow redirects only within the MCP endpoint's origin (#3397)

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   • Deprecate constructing the pre-provisioned OAuth clients without an issuer (#3435)

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7. Commits on Sep 2, 2026

   • Validate the authorization server metadata issuer on every discovery path (#3398)

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8. Commits on Aug 28, 2026

   • Expire idle Streamable HTTP sessions by default and cap concurrent sessions (#3395)

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9. Commits on Aug 26, 2026

   • Resolve tool output-schema references within the schema document only (#3394)

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10. Commits on Aug 25, 2026

    • Point imports of mcp.server.fastmcp at the migration guide (#3388)

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11. Commits on Aug 24, 2026

    • Give recursive tool return types an object-rooted output schema (#3376)

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    • Log MCPServer handler exceptions by kind and keep crash details off the wire (#3314)

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      maxisbey

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      Kludex

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    • Accept boolean sub-schemas in 2025-11-25 tool schema properties (#3354)

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