Plan mode is Claude Code's pause-and-confirm workflow. Enable it and Claude reads your codebase, writes out its full plan, and waits for your approval before touching a single file. It stops the most common AI coding mistake: changes you didn't mean to make.

Most developers discover plan mode after a bad experience — a refactor that spread across 30 files in the wrong direction, an auth change that broke three routes, a database migration that ran when it shouldn't. Plan mode is the fix.

What Plan Mode Is

Claude Code has 4 permission modes. Press Shift+Tab to cycle through them:

1. Default — Claude asks before file edits and shell commands
2. Auto-accept edits — Claude edits files without asking, still asks for other commands
3. Plan mode — Claude reads, analyzes, and proposes a plan. No source file edits until you say go.
4. Auto mode — Claude evaluates all actions with background safety checks (research preview)

In plan mode, Claude can still run read-only shell commands — search, git status, file reads, test runs. It cannot edit your source files until you explicitly approve the plan. The constraint is enforced by the tool, not just by Claude's judgment.

The official Claude Code docs describe plan mode as: "Claude explores and proposes a plan without editing your source files." That's the entire feature in one sentence.

How to Enable Plan Mode

Press Shift+Tab twice from the default mode. The terminal shows the mode indicator update. You can also start a session directly in plan mode:

claude --plan

Or use /plan as a slash command mid-session. Claude confirms the switch and waits for your task. Press Shift+Tab again to cycle to the next mode when you're done.

The 3 Situations Where Plan Mode Saves You

1. Refactoring Across Many Files

Renaming a function used in 15 files, extracting a module, or changing an API shape — these changes have a wide blast radius. In default mode, Claude starts editing immediately. You might not see the full scope until it's done.

In plan mode, Claude maps every affected file first: which ones need updates, in what order, and what tests will break. You see the complete picture before a single line changes.

2. Any Change to Production Code

Auth flows, payment processing, database migrations — mistakes in production carry real consequences. Plan mode creates a mandatory review step before execution. Think of it as a code review you get before the code exists, not after.

3. When You're New to a Codebase

Your first week on a project, you don't know what's coupled to what. Plan mode turns Claude into a guided tour: it reads the relevant files, explains the structure, and maps exactly what it intends to change. You learn the codebase as Claude plans.

What the Plan Output Looks Like

After you give Claude a task in plan mode, it responds with something like:

I'll make the following changes:

1. src/auth/session.ts — update token refresh logic to handle expired JWTs
2. src/api/middleware.ts — add early return for token validation failures
3. tests/auth.test.ts — add test case for the expired token scenario

No other files will be touched. Shall I proceed?

The format varies by task complexity. You always see: which files change, what the change does, and what side effects to expect. Read every line of the plan before approving — not just the first three.

Accepting, Rejecting, and Editing the Plan

Three moves after Claude presents a plan:

• Approve — "looks good, go ahead"
• Reject — "stop, that's not what I need — here's the actual problem"
• Edit — "change step 2 before proceeding — leave the tests alone for now"

Claude treats your feedback as conversation. Refine the plan through multiple rounds before execution starts. This is plan mode's core value: you collaborate on intent before committing to implementation.

Plan Mode vs. Auto-Approve Mode — When Each Is Right

Plan mode adds one round-trip to every task. On a 10-file refactor, that's a few minutes of review for hours of safe execution. The overhead is nothing compared to debugging runaway edits.

The Spec-Driven Workflow

The most effective Claude Code pattern combines a written spec with plan mode:

1. Write the spec — a short markdown file describing what changes, why, and which edge cases matter. Be specific about components and behaviors.
2. Point Claude at it — "Read SPEC.md and plan how to implement it."
3. Review the plan — Claude generates a plan based on your spec. Compare it line by line against your intent.
4. Execute — approve and let Claude work.

This 3-step loop works for features spanning multiple systems. The spec becomes a shared contract: you know what you want, Claude knows what to build, and the plan surfaces any gap between the two.

If you're new to Claude Code, start with what Claude Code is, the beginner tutorial, and the getting started guide.

Common Mistakes Even in Plan Mode

Vague prompts produce vague plans. "Fix the auth" will get you a plan — probably not the one you wanted. Be specific: "The session token doesn't expire after logout. Fix the issue in src/auth/session.ts and update the middleware."

Not reading the full plan. Claude might list 8 files. Most developers approve after reading the first 3. The file you skim is usually the one that breaks production.

Approving without understanding. If a step in the plan doesn't make sense, ask Claude to explain it before you say go. Plan mode exists for this exact moment — use it.

Treating plan mode as a one-size-fits-all default. Plan mode is for complex or risky tasks. For simple bug fixes and small iterations, auto-accept mode is faster with no meaningful risk increase.

Build Spec-Driven Workflows Into Your App With Claude Code or Cursor

Building a developer workflow tool, project planning app, or AI-assisted coding assistant? Use Blink's skill to scaffold it instantly.

npx skills add https://github.com/blink-new/blink-plugin
blink login

Then give your agent this prompt:

Build a spec-driven workflow tool. Users write feature specs in markdown. The app stores each spec, generates a task breakdown, and tracks which tasks are complete. Include a plan review step before any task moves from "planned" to "in progress." Show a dashboard with spec status and task completion rates.

Blink includes database (no Supabase), auth (no Clerk), and hosting (no Vercel) — all in one bill. Deploy at blink.new/cloud. Full skills docs at blink.new/docs/cloud/tools/skills.

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