Sandbox demo

Plan Mode

Read-only thinking before any edit. The cure for premature commitment.

In Plan Mode the agent can read, search, and reason — but it cannot edit, run shell commands that modify state, or commit. It produces a plan you approve before it gets the tools to act.

When to use it: anything that touches more than two files, anything you're not 100% sure how to scope, anything where the wrong approach costs more than waiting one extra turn.

Sandbox transcript
Claude Code · sandbox replay
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The transcript is canned — no real API calls. The point is to internalize the loop: user → plan → tool → result → answer.

Check your understanding
Q1. Why does Plan Mode disallow edits?
· Score 100% on the quiz.