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Runbooks and work modes control different parts of a launch.

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Runbooks

runbook controls collaboration posture. It does not choose the model.
RunbookUse it for
liteFocused, low-overhead work. This is the default.
heavyLonger multi-actor work where intermediate synthesis matters.

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Work modes

work_mode controls goal posture. It does not choose the provider.
Work modeUse it for
directed_effortScoped, outcome-directed execution with a clear target.
open_ended_discoveryExploratory work where discovery and option-finding matter.

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Example

run = client.runs.start(
    "Explore likely causes of flaky benchmark results and summarize evidence.",
    host_kind="daytona",
    work_mode="open_ended_discovery",
    providers=[{"provider": "openrouter"}],
    runbook="heavy",
)
Backend preflight validates the final launch.