Instructor v1.17.0 introduces cache isolation and async validation changes

The release of Instructor v1.17.0 by 567-labs includes several significant updates and fixes, as outlined in the project's GitHub release notes. Among the changes, cached responses now use new keys and isolated per-client namespaces by default, meaning existing cache entries will miss unless an explicit cache_namespace is set for shared results across clients. Additionally, response models with async-validator decorators are now rejected before provider calls or cache lookup, deferring automatic execution of async validation. Remote media URLs must resolve to public addresses without credentials, and downloads are subject to size limits and stricter validation.

Operators planning to upgrade should carefully evaluate the impact of cache isolation on their workflows. If multiple clients previously relied on shared cache entries, they will need to explicitly configure the cache_namespace to maintain shared behavior. Failure to do so could lead to unexpected cache misses and degraded performance. Similarly, the rejection of async-validator response models may require adjustments to validation processes, such as replacing async validators with Pydantic validators or awaiting application-level validation explicitly. These changes align with broader trends in improving security and namespace isolation across projects, but they may require pre-upgrade testing to ensure compatibility with existing systems.