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Add HttpServerSessionMode for hybrid stateful/stateless HTTP serving (#1796)

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Jeff Handley <jeffhandley@users.noreply.github.com>
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pardhu 2026-08-12 23:36:36 -07:00 • committed by GitHub
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docs/list-of-diagnostics.md
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@ -44,5 +44,5 @@ When APIs are marked as obsolete, a diagnostic is emitted to warn users that the
| `MCP9003` | In place | The `RequestContext<TParams>(McpServer, JsonRpcRequest)` constructor is obsolete. Use the overload that accepts a `parameters` argument: `RequestContext<TParams>(McpServer, JsonRpcRequest, TParams)`. |
| `MCP9004` | In place | <xref:ModelContextProtocol.AspNetCore.HttpServerTransportOptions.EnableLegacySse> opts into the legacy SSE transport which has no built-in HTTP-level backpressure. Use Streamable HTTP instead. See [Stateless and Stateful — Legacy SSE transport](xref:stateless#legacy-sse-transport) for details. |
| `MCP9005` | In place | The Roots, Sampling, and Logging features are deprecated as of specification version 2026-07-28 and may be removed in a future version. See [SEP-2577](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2577) for more information. |
| `MCP9006` | In place | The stateful Streamable HTTP configuration knobs on <xref:ModelContextProtocol.AspNetCore.HttpServerTransportOptions> — `EventStreamStore`, `SessionMigrationHandler`, `PerSessionExecutionContext`, `IdleTimeout`, and `MaxIdleSessionCount` — only apply when `Stateless = false`. Starting with the `2026-07-28` protocol revision, Streamable HTTP no longer supports sessions, and the SDK now defaults `Stateless` to `true`. These knobs remain available for back-compat with the legacy stateful Streamable HTTP transport but new code should target the stateless path. |
| `MCP9006` | In place | The stateful Streamable HTTP configuration knobs on <xref:ModelContextProtocol.AspNetCore.HttpServerTransportOptions> — `EventStreamStore`, `SessionMigrationHandler`, `PerSessionExecutionContext`, `IdleTimeout`, and `MaxIdleSessionCount` — only apply when the request is served with a session. Starting with the `2026-07-28` protocol revision, Streamable HTTP no longer supports sessions, and the SDK now defaults `SessionMode` to `HttpServerSessionMode.Stateless`. These options remain available for back-compat with the legacy stateful Streamable HTTP transport but new code should target the stateless path. |
| `MCP9007` | In place | `AuthorizationRedirectDelegate` and `ClientOAuthOptions.AuthorizationRedirectDelegate` are retained for source and binary compatibility but cannot provide the authorization-response state or RFC 9207 issuer. State and issuer validation are skipped when these APIs are used. Use `ClientOAuthOptions.AuthorizationCallbackHandler` for response-bound, issuer-aware authorization flows. |