Distillation

Date: Sep 16, 2026

• 🔴 (22:50) User established the invariant: “Failed usage/accounting never depends on client demand.”
• 🟡 (22:50) Truncated tool output was saved to /home/byk/.local/share/opencode/tool-output/tool_0ac699aa7001D4aaSO2A2lGBPf.
• 🟡 (22:50) Response-stream validation rejects malformed terminal events when response is absent, non-object, or an array; when duplicate response.created occurs after state.created; when response.in_progress occurs before creation; or when a supplied response.id differs from state.id, using new Error("malformed Responses terminal event") or malformed().
• 🟡 (22:50) The response-stream implementation tracks lastSequenceNumber, terminalContentParts, state.refusalDoneItems, implicitContentIndexByItem, and state.rawItems, with raw terminal item accumulation via state.rawItems.set(outputIndex, { ...accumulated, ...snapshot }); failed usage/accounting processing occurs around the response.failed terminal path.