startSubagent

startSubagent(opts: SubAgentInit): SubAgent

Call as tracing.startSubagent() after importing tracing from @coreweave/forge-sdk/agentlens. Start a SubAgent span. Same parent-resolution rules as startTool.

Parameters

SubAgentInit

required

Type: SubAgentInit

Returns

SubAgent

Examples

tracing.startSubagent({name: 'critic'});

tracing.startSubagent({
  name: 'critic',
  model: 'gpt-4o',
  systemInstructions: ['Critique the proposed plan.'],
  startTime: new Date('2026-05-29T10:00:00.000Z'),
});

Last modified on September 28, 2026

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