model routing — Sending each request to a model chosen by the difficulty of the task, rather than using one model for everything.
agent hook — A script the harness runs automatically at a fixed point in an agent's loop — before a tool call, after an edit, on session start.
Why it matters
New model routingSending each request to a model chosen by the difficulty of the task, rather than using one model for everything.Full definition → (GPT-5.6 via Bedrock, GLM-5.3 replacing 5.2) plus agent hookA script the harness runs automatically at a fixed point in an agent's loop — before a tool call, after an edit, on session start.Full definition → changes — on_failure handling and a stable tool_call_id across the tool lifecycle — directly affect anyone scripting goose's tool gates.