Function createGuardrailBlockedStream

Create a stream that emits a single error chunk for blocked content.

Use this when input evaluation returns GuardrailAction.BLOCK to generate an appropriate error response without invoking orchestration.

Example

if (outcome.evaluation?.action === GuardrailAction.BLOCK) {
  yield* createGuardrailBlockedStream(
    guardrailContext,
    outcome.evaluation,
    { streamId: 'stream-123', personaId: 'support-agent' }
  );
  return;
}
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