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Reliability semantics in production: stop inheriting invisible defaults.

Model runtimes often inherit retry and delivery behavior from transport libraries that were never designed for contract-critical workloads. This creates hidden behavior changes during routine dependency upgrades.

MIG reliability profiles expose these choices directly in the invocation contract. Teams select profile semantics deliberately, validate them through conformance, and keep those choices stable over time.

The practical result is fewer ambiguous incidents. Operators can explain why an invocation was replayed, suppressed, or escalated by reading contract metadata instead of reverse-engineering runtime internals.