Armin Ronacher 12/17/2025

What Actually Is Claude Code’s Plan Mode?

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This article explores the technical workings of 'Plan Mode' in Claude Code, an AI coding assistant. The author, a user of the more permissive 'YOLO mode', investigates Plan Mode's implementation, detailing how it creates and edits internal markdown plan files, manages tool permissions, and uses a state machine to control its read-only planning phase.

What Actually Is Claude Code’s Plan Mode?

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