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1. Commits on Aug 28, 2026

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

     maxisbey

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2. Commits on Aug 26, 2026

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

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3. Commits on Aug 25, 2026

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

     maxisbey

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4. 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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5. Commits on Aug 20, 2026

   • Apply the request body limit to the SSE and OAuth endpoints (#3336)

     maxisbey

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   • Hand TypedDict tool results to pydantic natively (#3331)

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6. Commits on Aug 17, 2026

   • Acknowledge notification POSTs with 202 on the 2026-07-28 HTTP entry (#3326)

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   • Let Client take StdioServerParameters directly (#3321)

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   • MCPServer: content-block returns are unstructured, prompt messages take Image/Audio (#3320)

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7. Commits on Aug 16, 2026

   • Drop later-revision cache-hint fields on pre-2026 sessions (#3223)

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   • docs: lead the README client example with a URL, not the server object (#3315)

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   • Pin text I/O to UTF-8 and fail CI on locale-dependent reads/writes (#3296)

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8. Commits on Jul 29, 2026

   • Retire wording tied to pre-2.0 milestones (#3211)

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9. Commits on Jul 28, 2026

   • Serve v2 docs at the site root, with permanent per-major paths (#3176)

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   • Remove unused StreamableHTTPTransport.get_session_id() (#3205)

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   • Expose the middleware chain on MCPServer and stop sending unrequested change notifications (#3201)

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   • Fail fast on server-to-client requests in JSON-response mode instead of hanging (#3195)

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   • Remove unused mcpserver.exceptions.ValidationError (#3199)

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   • Gate log notifications on the per-request log-level opt-in at 2026-07-28 (#3198)

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10. Commits on Jul 27, 2026

    • Add mcp.types as a permanent alias for mcp_types (#3190)

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    • Stop answering cancelled requests (#3188)

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    • Split the registration request model from the registered-client record (#3181)

      maxisbey

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    • Make the per-version wire packages private (`mcp_types._v*`) (#3191)

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11. Commits on Jul 26, 2026

    • Cache compiled output-schema validators on ClientSession (#3134)

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      jlowin

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      maxisbey

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12. Commits on Jul 25, 2026

    • Replace FileResource.is_binary with an encoding field (#3171)

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    • Narrow message_handler's parameter to notifications and exceptions (#3168)

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    • Remove the unused timeout parameter from OAuthClientProvider (#3165)

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    • Stop advertising MCP_* env vars for MCPServer settings; drop pydantic-settings (#3170)

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    • Remove the deprecated RFC7523OAuthClientProvider (#3169)

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    • Rename scopes= to scope= on the client-credentials OAuth providers (#3166)

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    • Remove Context.client_id (#3167)

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    • Make CacheConfig() the Client cache default and None the off switch (#3164)

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    • Isolate the stdio server's stdin and stdout from handler subprocesses (#3117)

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