feat: add arun_stream and run_stream to HierarchicalSwarm - #1611
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kyegomez merged 2 commits intoMay 28, 2026
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Bridge the existing callback-based streaming in run() to async/sync generators so HierarchicalSwarm can be consumed the same way as AgentRearrange and SequentialWorkflow. arun_stream(with_events=True) emits agent_start / token / agent_end structured events. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Rewrite arun_stream to stream every phase of the hierarchical swarm: - Director plan tokens stream as produced - Workers stream with parallel interleaving via asyncio.Queue - Aggregator (feedback director / judge) streams its synthesis - with_events=True emits swarm_start, director_start/token/end, worker_start/token/end, aggregator_start/token/end, swarm_end - Every event tagged with role and loop index - Fix call_single_agent to enable streaming_on when callback provided Add 5 pytest tests covering plain streaming, event types, parallel interleaving, aggregator feedback, and token metadata. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
arun_stream(task, img, with_events)async generator toHierarchicalSwarmrun_stream(task, img, with_events)sync generator wrapperstreaming_callbackplumbing inrun()to generator-based streaming viaasyncio.Queuewith_events=Trueemits structuredagent_start/token/agent_enddicts (same format asAgentRearrangeandSequentialWorkflow)(agent_name, token)tuplesHow it works
arun_streamruns the existingself.run(streaming_callback=...)in a background thread. The callback pushes(agent_name, chunk, is_final)items to anasyncio.Queueviacall_soon_threadsafe. The async generator yields from the queue, accumulating chunks per agent to include the full output inagent_endevents.Parallel worker execution interleaves naturally since multiple threads push to the same queue concurrently.
Test plan
python3 -c "from swarms import HierarchicalSwarm; import inspect; print(inspect.signature(HierarchicalSwarm.arun_stream))"🤖 Generated with Claude Code
📚 Documentation preview 📚: https://swarms--1611.org.readthedocs.build/en/1611/