Short link creator treats slug collisions as negotiations, not errors

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The developer of a short link creator built custom slugs for AI agents, but initially returned a hard error whenever a slug was already taken. A collision with an abandoned link caused retry storms that saturated the rate limiter, prompting a redesign. Collisions now return the existing link with a flag, letting callers accept an auto-suffixed variant or reclaim a slug only if it has had no clicks in 90 days. The developer also found that agents losing their one-time manage secret create duplicate links for the same destination, and proposed making creation idempotent on destination and owner hint. The overall lesson is that link APIs should treat slug collisions, lost secrets, and moved destinations as normal operation.

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