Orchestrate subagents at scale with dynamic workflows changedworkflows
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379379* If you choose a [size guideline](#set-a-size-guideline) yourself, its agent count replaces the 25-agent threshold. The built-in default guideline leaves the threshold at 25.
380380* Sessions with [ultracode](#let-claude-decide-with-ultracode) on don't show the warning, because turning ultracode on already opts you in to large runs.
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382Every agent in a workflow uses your session's model unless the script routes a stage to a different one or the [`CLAUDE_CODE_SUBAGENT_MODEL`](/docs/en/model-config#environment-variables) environment variable is set, which overrides both. To control the model cost:
382Claude Code picks each workflow agent's model in the same [order it uses for subagents](/docs/en/sub-agents#choose-a-model). A model the script names for a stage counts as the per-invocation model in that order. When nothing else assigns one, the agent runs on your session's model.
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384To control the model cost:
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384386* Check `/model` before a large run if you usually switch to a smaller model for routine work
385387* Ask Claude to use a smaller model for stages that don't need the strongest one when you describe the task
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