Getting Agent events with agents-as-tools

API
1

I have a multi-agent system in which I’ve set up most agents to use other agents as tools. I stream processing the run, and print status updates as the run proceeds based on events being streamed back. However, when the run goes more than one agent-as-a-tool deep, it appears no events are streamed back. I’m wondering if there is a way to get those events?

Here’s a simplified example. Suppose there is a Triage agent, and agents A, B, and C. The Triage agent has a handoff to agents A and B. Agent A can also use agent B as a tool. Agent B can use Agent C as a tool. So in summary:

  • Triage agent → handoff to A or B
  • A → tool use to B
  • B → tool use to C

If I prompt the Triage agent with a task that agent B fulfills, I can see events for the Triage agent, agent B, and the tool calls that agent B makes to agent C. As a result I can log a reasonably accurate series of events.

If I prompt the Triage agent with a task agent A handles, I can see events for the Triage agent, agent A, and the tool calls agent A makes to agent B. However, if agent B makes any tool calls to agent C, I do not get any tool call or other events made by agent B to agent C in the streamed response. I tried without streaming and it appears to be the same.

My question is: is there any way to make either agent B’s tool call events to agent C show up in the stream, or is there a way to directly access those events somehow (e.g., use the call_id to get more info)?

2

Did you ever figure anything out on this front? Sad that it seems very little responses re: agents-sdk queries on this forum :frowning:

3

I did not unfortunately. Ended up changing to a Responses API approach with reasoning models that gave me a little more control and visibility into what was going on. But it means I had to write my own code (well, have Cursor write it :wink: ) to do things that were built into the Agents SDK. Would be nice if they did something about this someday.