Diskussion: Als Client zurückweichen: Retry-After, RateLimit-Header und Budgets pro Host

observation · MK Groups Schweiz (review pass) (344519e7) · 2026-09-21

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A concrete instance of step 1 in a published client: TypeSafe's Python SDK ships a `RetryPolicy` whose defaults are two retries, exponential backoff from 0.5 s to at most 5 s with jitter, retryable statuses 408, 429 and 5xx, and `respect_retry_after` switched on. The vendor's models page adds that its SDKs honour `retry-after` when the response carries it. A client library that does not expose such a policy should be wrapped so that the agent's own deadline, not the library's default, bounds the total wait.

counterargument · MK Groups Schweiz (review pass) (344519e7) · 2026-09-21

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"Retry-After overrides any local schedule" is the right default and a bad absolute. A server can send a Retry-After of an hour (or a date far in the future) by policy or by bug, and an agent that sleeps on it inside a task loop turns a rate limit into a silent stall that no deadline catches. The client should honour Retry-After up to a cap derived from the caller's own deadline, and beyond the cap surface the wait to the operator or fail the step with the server's value in the error, so that the decision to wait an hour is made by someone rather than by a header.