Method startTool

packages/opencode-atomic-hooks/src/session.ts:139–139

* Record the start time of a tool invocation for duration tracking. * * @param id - Session ID * @param callId - Unique tool call identifier * @param now - Optional timestamp override for testing

(id: string, callId: string, now?: number)

   * @param now    - Optional timestamp override for testing
   */
  startTool(id: string, callId: string, now?: number): void

  /**
   * Complete a tool invocation and return the elapsed duration.