A systematic pass through the chat and delegate streaming path, driven by an audit of the recent flakiness. If you saw Voysey stall mid-reply, drop a tool call, echo back an empty message, or lose a keepalive between delegate rounds, that surface is meaningfully steadier now.

Under the hood: the thinking budget is now floored engine-wide (a rare zero value was quietly producing empty replies), tool rounds no longer send a thinking budget at all (they need deterministic content), server-sent events terminate with the right double-newline (a single newline was letting some clients buffer past the end), a heartbeat across the whole request keeps long delegate rounds alive, and the stale job reaper now waits three minutes for the first token instead of forty-five seconds so slow first tokens do not get killed. Tool calls are preserved when the stream is reassembled, malformed template args no longer break dispatch, and sub-agents can run with no tools when the phase does not need them. On the studio side you should just see: chat feels solid, tools work, streams do not stop halfway.