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OpenAI's Agents SDK v0.19.0 lets the model write code that calls tools instead of picking them one at a time. The real story isn't the feature. It's what it does to the observability layer other vendors are quietly trying to own.
Modal's CTO says the old infra stack worked because humans could fill in missing context in their heads. Agents can't. That single admission is forcing a redesign of every dashboard, error message, and config layer in the agent stack.
Arize Phoenix v16.0.0 ships Code Evaluators that let users write their own scoring logic in the UI, no deployment required. The real story is what this admits about the state of agent evaluation.
Claude's recent updates prioritizing internal fixes over features reveal a broader enterprise trend: AI agents are moving from rapid prototyping to systematic hardening.
