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Enable clients to report errors back to the server using the mutually exclusive error field on the v0.9 message envelope. Completes v0.3.0 spec compliance milestone. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Error demo agent (/agents/error-demo) with unknown component fallback UI and server-side error reporting round-trip - Demo pages in both WASM and Server sample apps with nav links - Python server parity for error demo endpoint - ComponentRegistry warns only once per unknown type (HashSet) - A2UIComponentRenderer warns only once per component instance - Fix ObjectDisposedException in A2UIStreamClient.Dispose() when CancellationTokenSource was already disposed during circuit teardown Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
A2UIClientErrorprotocol type: New class withCode,SurfaceId,Message,Path?— matches v0.9client_to_server.jsonerror schemaA2UIClientMessage.Error: Envelope now supports mutually exclusiveactionORerrorfield (both useJsonIgnore(WhenWritingNull))SendErrorAsync: New method onA2UIStreamClient— same pattern asSendActionAsync(POST envelope, process response stream, capabilities header)IA2UIAgent.HandleErrorAsyncdefault interface method (no-op); middleware routes error POSTs to itThis completes all v0.3.0 items (A2UI v0.9 Spec Compliance).
Test plan
ErrorEnvelope_Serializes_WithVersionAndError— envelope structureErrorEnvelope_OmitsAction_WhenOnlyErrorSet— mutual exclusivityErrorEnvelope_OmitsError_WhenOnlyActionSet— backwards compatibilityErrorEnvelope_IncludesPath_WhenProvided— VALIDATION_FAILED with pathErrorEnvelope_OmitsPath_WhenNull— generic error omits pathErrorEnvelope_HasExactlyTwoTopLevelProperties— version + error onlySendErrorAsync_SendsV09ErrorEnvelope— end-to-end POSTSendErrorAsync_IncludesCapabilitiesHeader— header presentSendErrorAsync_IncludesPath_ForValidationError— path in bodySendErrorAsync_OmitsPath_WhenNull— no path in bodySendErrorAsync_ProcessesResponseStream— dispatches server responseStreamClient_SendErrorAsync_NetworkError_Throws— error propagationStreamClient_SendErrorAsync_ServerError_Throws— 5xx propagation🤖 Generated with Claude Code