[dotnet-port-fixes] Surface response.failed error content

[Michelle Clayton (michelle-clayton-work)]

Summary

Port the .NET failure-handling fix from microsoft/agent-framework#7497 into the shared Go Responses provider path so response.failed events surface structured ErrorContent instead of empty updates. The Go change also applies the same fallback to failed non-streaming responses when the provider omits explicit error details, using a default message/code rather than silently dropping the failure.

Ported .NET PRs

• .NET: Fail declarative workflows when an agent returns an error agent-framework#7497 - fail declarative workflows when an agent returns an error

Upstream commit referenced: d56e81357e5179b6f916b180c0cb34ea2e73c80b.

Breaking Changes

No. This keeps the public Go API unchanged and only corrects how existing failed Responses API events are surfaced to callers.

Tests and Examples

• go test ./provider/openaiprovider
• go test ./provider/foundryprovider
• Added coverage for streaming response.failed events and failed responses without explicit provider error details

Notes

• Duplicate check: no recent [dotnet-port-fixes] or [dotnet-port-api] issue/PR title in microsoft/agent-framework-go matched this failure-handling area.
• The fix is intentionally scoped to the shared OpenAI Responses translation path used by Foundry, so no exported API or docs/example updates were needed.

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Closes #787

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[github-actions]

Parity Review: ✅ Approved

This PR is a direct port of the .NET fix from microsoft/agent-framework#7497. It corrects how response.failed events (both streaming and non-streaming) surface structured ErrorContent instead of silently dropping failures.

Scope: Only unexported helper functions in provider/openaiprovider/responses.go are modified. No exported Go API surface changes.

Parity: The behavior now aligns with the upstream .NET fix — failed responses produce structured error content with a message and error code. The Go-specific addition of a default fallback message/code for responses missing explicit error details is a defensive improvement consistent with the upstream intent.

Verdict: No cross-repo consistency issues. No public-api-change label needed.

Generated by Go API Consistency Review Agent for #804 · sonnet46 · 19.6 AIC · ⌖ 5.53 AIC · ⊞ 5.7K · ◷