Add OpenRouter sample: prompt batch with cached retries - #520
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Call OpenRouter from an Activity with the openai client pointed at OpenRouter, client retries off so Temporal owns every attempt, error classification with Retry-After as the next retry delay, heartbeats, and OpenRouter response caching so a retried identical request is billed at zero. The Workflow fans a prompt batch out under bounded concurrency and reports skipped prompts instead of failing the batch.
This was referenced Sep 11, 2026
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Adds an
openroutersample: a Workflow that fans one Activity out per prompt through OpenRouter's Auto Router and returns answer, model, and reported cost per prompt.The Activity uses the
openaiclient pointed at OpenRouter withmaxRetries: 0, classifies 4xx as non-retryable and 408/429/5xx as retryable, passesRetry-Afterthrough asnextRetryDelay, heartbeats, checks for OpenRouter's 200-with-error body, and sendsX-OpenRouter-Cache: trueso a retried identical request is served from OpenRouter's cache at $0. A--fail-onceflag on the client demonstrates that; verified live with aHITat $0 on attempt 2.Tests use a fake
fetchand a fake Activity; no API key needed. Registered in the CI project list and the sample list. This is the TypeScript port of temporalio/samples-python#366 (prompt_batch); thebudget_gatescenario stays Python-only for now.