By default Claude can start editing files as soon as you send a prompt. If its first guess is wrong, you pay for the re-work. Anthropic's cost guide points to plan mode for complex tasks: Claude explores and proposes an approach for your approval first, which the docs say prevents expensive re-work when the initial direction is wrong.
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Unlocks: Step 1: turn plan mode on · Step 2: let Claude write the plan · Make it the default for a project · The catch · Sources
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