simulation: don't start the worker HTTP server - #6055
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Simulations launch ephemeral workers side by side; a health endpoint on a fixed port made concurrent runs fail with 'address already in use'.
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davidzhao
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Jun 11, 2026
Bobronium
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Jun 11, 2026
u9g
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Jun 17, 2026
…agent name override) Add a simulation flag to worker options, derived from the connect-room CLI path. In simulation mode: skip worker HTTP server creation/start/close so concurrent runs don't collide on a fixed port, disable the worker load limit (loadThreshold = Infinity) so runs can saturate the agent, and resolve agentName from LIVEKIT_AGENT_NAME_OVERRIDE first so lk simulate dispatch matches. Ported from livekit/agents#6055
u9g
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Jun 17, 2026
…agent name override) Add a --simulation CLI flag (on the start command, set by `lk simulate`) that threads through to worker options. In simulation mode: skip worker HTTP server creation/start/close so concurrent runs don't collide on a fixed port, disable the worker load limit (loadThreshold = Infinity) so runs can saturate the agent, and resolve agentName from LIVEKIT_AGENT_NAME_OVERRIDE first so lk simulate dispatch matches. Ported from livekit/agents#6055
u9g
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Jun 25, 2026
…agent name override) Add a --simulation CLI flag (on the start command, set by `lk simulate`) that threads through to worker options. In simulation mode: skip worker HTTP server creation/start/close so concurrent runs don't collide on a fixed port, disable the worker load limit (loadThreshold = Infinity) so runs can saturate the agent, and resolve agentName from LIVEKIT_AGENT_NAME_OVERRIDE first so lk simulate dispatch matches. Ported from livekit/agents#6055
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Summary
Running two
lk agent simulatesessions concurrently fails with "address already in use": each launched worker bound the health/debug HTTP server on the same fixed port.Under
--simulationthe worker is ephemeral and CLI-supervised — nothing scrapes its health endpoint — so the server is now simply not created.http_portregistration and shutdown already handled theNonecase.🤖 Generated with Claude Code