Editing Openai/694057b6-101c-8007-9a65-c40578c7252d (section)

==== 13. Tools and exit tools ====

===== Normal tools (round-trip) =====
* OpenAI function/tool calling schema.
* Executed via pluggable ToolRunner.
* Budget is iterations, not calls: - one assistant tool-emission that contains any normal tool calls consumes exactly 1 iteration, even if it requests multiple tools at once.
* Fallback parsing is allowed when structured tool_calls are absent/unreliable (BIOS-guided strict JSON).

===== Tool failure classification (locked) =====

Tools should only kill the request when there is an actual execution/format problem, such as:
* tool runner timeout,
* tool runner exception,
* malformed tool arguments (parse/validation),
* non-serializable result (implementation error),
* unknown tool name.

Domain outcomes are not failures:
* e.g. “search found nothing” must be a successful tool result (empty list / {results: []} / {found: false}), and the request continues.

===== Exit tools (one-way signals; non-terminating) =====
* Exit tools are provided at worker init as tool definitions.
* Worker exposes them to the model and records any exit-tool calls as structured signals[].
* Exit tools are never executed (no ToolRunner) and never alter control flow.
* Priority: process normal tool loop as usual; record exit signals whenever they occur.
* Models will be encouraged (via BIOS) to emit exit tools near completion, but correctness does not depend on it.