Set the active tool revision

Configuration for an API_CALL tool, stored in Tool.configuration.

Supports {{variable}} placeholders in url, headers, and body that are resolved at execution time from the tool's input variables and runtime metadata (via {{metadata.key}}).

A call_transfer revision's stored target, surfaced on reads.

ToolRevisionResponse.configuration is api_call-typed and parses to None for a transfer config (it has no url), so this field carries the destination/mode back for the transfer-target picker. label / when_to_use come from the parent Tool's name / description.

Defines which fields to extract from a tool response.