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Fix HTTP task filter composition (#1722)

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Pranav Senthilnathan 2026-07-24 13:33:19 -07:00 • committed by GitHub
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docs/concepts/filters.md
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@ -32,6 +32,22 @@ The following request filter methods are available on `IMcpRequestFilterBuilder`
| `AddUnsubscribeFromResourcesFilter` | Resource unsubscription handlers |
| `AddSetLoggingLevelFilter` | Logging level handlers |
The Tasks extension and ASP.NET Core tool authorization use alternate-result `tools/call` filters.
Alternate-result filters run in registration order outside the ordinary `AddCallToolFilter`
pipeline. The Tasks filter creates a task at its position in that order and runs its remaining
pipeline in the background. Consequently, alternate-result filters registered before Tasks run
before task creation, while those registered after Tasks run in the background before the
ordinary filters and tool. ASP.NET Core authorization is registered before Tasks, so an
unauthorized call is rejected without creating a task.
Ordinary call-tool filters run exactly once after all alternate-result filters and before the tool.
For task-backed calls, ordinary filters execute in the background after task creation. An explicit
`CallToolWithAlternateHandler` remains a full replacement and cannot be combined with ordinary
call-tool filters.
Configure `WithTasks` before adding ordinary call-tool filters. Tasks validates this ordering when
its filter is installed because it must execute outside the ordinary call-tool pipeline.
## Message Filters
In addition to the request-specific filters above, there are low-level message filters that intercept all JSON-RPC messages before they are routed to specific handlers.