Plan mode is a read-only permission mode. Claude reads your files, searches your code, and proposes a plan of action, but it makes no changes at all. Nothing gets written, edited, or run until you approve. That gap between thinking and doing is the whole point.
Why the read-only step matters
When you hand Claude a big or unfamiliar task, the risky part is not the typing. It is the misunderstanding. If Claude guesses wrong about how your code is laid out, it can edit ten files in the wrong direction before you notice. Plan mode moves the guessing into the open. You see the plan first and catch the wrong turn before any file changes.
Think of it as measuring twice and cutting once. You spend a minute reading a plan and save an hour undoing edits.
When to reach for it
Plan mode fits work that is complex or unclear:
- A refactor that touches many files
- A codebase you have never opened before
- A change where the approach is not obvious yet
- Any task where a wrong guess is expensive to undo
For a quick one-line fix you already understand, plan mode is overkill. Save it for the moments where a shared plan is worth more than speed.
The shape of a session
The usual flow is simple: Claude explores, proposes a plan, you approve, and only then does it implement. You stay in control of the moment work begins.
Explore -> Plan -> (you approve) -> Implement -> Verify
The next articles show how to enter plan mode and how to work the loop well.
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