Course contents
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. Toggle it with Shift+Tab, or launch straight into it with claude --permission-mode plan.
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
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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?
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Vocabulary in this lesson
Plan modeA read-only agent mode: the agent may search and read, but must propose a plan for your approval before it edits anything.SessionOne continuous run with an agent, from an empty context to the moment you clear it, close it, or hand its work off.
Plain-English definitions from the AI Coding Dictionary.