Earendil argues inference APIs now return provider-sealed state that no other model can read

Sources: primary, discussion
Summary: The post argues that hosted inference APIs increasingly return session state the client cannot read, and names cases: OpenAI stored responses retained at least 30 days by default, the Gemini Interactions API defaulting to store true with 55-day paid and 1-day free retention, OpenAI compaction documented as opaque and not human-interpretable against Anthropic compaction returning a readable content field, and hosted search that returns citations rather than the retrieved passages. It places the Codex commit that encrypts multi-agent v2 message payloads inside that wider pattern. The framing is the author's argument, though the individual claims about API behaviour are checkable against vendor documentation.
Why it matters: The post names the specific API fields that decide whether a team can move an agent session to another provider or reconstruct afterwards what a subagent was told to do.