Pydantic AI 2.62 tightens durable and realtime agent state
Pydantic AI 2.62 adds typed authentication, rejection and not-found errors; mid-conversation reasoning changes; append-only instruction and memory updates; realtime tool-failure delivery; prompt-cache preservation; and deterministic durable-workflow ordering.
Why it matters: Typed failures and append-only state make agent recovery easier to reason about, while the broadcast-order change can alter replay of workflows already paused during an upgrade.