Use Claude Code’s plan mode when a task is ambiguous, broad, unfamiliar, or costly to get wrong: it lets Claude investigate and propose an approach before making source changes, so you can check the plan first. Build directly when the request is clear, the change is small and reversible, and your session’s permission settings provide enough oversight. Add an independent reviewer when security, privacy, data integrity, production operations, or specialist judgment is at stake.
What Claude Code plan mode does
Anthropic describes plan mode as a way for Claude “to research and propose changes without making them.” It is a permission mode and a pre-edit checkpoint—not a guarantee that the proposed approach is correct or complete. Anthropic’s permission-mode guide explains the workflow.
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When Claude has prepared a plan, you can proceed, proceed while manually reviewing edits, or stay in plan mode and ask for revisions. That makes planning useful when you want to catch a misunderstood goal, unnecessary scope, missing tests, or risky operations before implementation begins.
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Plan first when the cost of agreeing on an approach is lower than the cost of discovering a bad assumption after code has changed. These are practical decision rules, not thresholds set by Anthropic.
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- The request leaves important choices open. The desired outcome is known, but the implementation, architecture, or trade-offs are not.
- The work crosses components or unfamiliar code. Discovery can reveal dependencies and help bound the change before edits.
- A wrong approach would be expensive to undo. Agree on scope and validation before Claude starts changing files.
- You need a test or rollout plan first. Make the evidence for “done” part of the proposal rather than an afterthought.
Ask Claude to inspect the relevant code, respect stated constraints, and return a bounded plan that includes risks and validation steps. Review whether it serves the actual goal, covers the important cases, and avoids unrelated work. If it does not, request a revision while still planning.
Should I plan first or let Claude Code build?
“Build directly” is a workflow choice, not an official Claude Code mode. It can suit a small, clearly specified task whose result is easy to inspect and reverse, provided the active permission mode gives you an acceptable level of oversight. For example, a narrowly scoped change with an obvious expected result may not need a separate planning checkpoint.
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Permission settings still govern what Claude can do. Anthropic’s guide describes Manual (configuration value default), acceptEdits, plan, auto, dontAsk, and bypassPermissions. Their behavior and availability depend on the interface, settings, and sometimes version or provider; do not treat “build directly” as permission to skip those controls.
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitches| Decision factor | Plan first when… | Build directly when… | Add a reviewer when… |
|---|---|---|---|
| Ambiguity | Requirements or architecture choices are unresolved. | The requested outcome is clear. | A domain expert must validate assumptions. |
| Scope | Several components or unfamiliar paths may be involved. | The change is small and localized. | The impact spans a shared or broad system. |
| Cost of error | Rework would be expensive. | The result is easy to inspect and reverse. | A failure could affect users, data, security, or operations. |
| Verification | You need to agree on tests or rollout before edits. | Expected behavior is straightforward to check. | The author cannot provide independent assurance. |
| Oversight | You want to inspect the approach before edits. | Your current permission settings provide enough oversight. | Accountable human judgment is needed beyond automated checks. |
How to use plan mode and review the result
- Enter plan mode. In the CLI, start with
claude --permission-mode plan; the permissions guide also documents using/planor entering the mode in the interface. See the CLI reference and permission-mode guide. Mode defaults and behavior differ in some interfaces, including VS Code, so check the documentation for your setup. - State the goal and boundaries. Identify the relevant files or areas to inspect, constraints, desired behavior, and what evidence will count as completion.
- Check the proposal. Look for misunderstood requirements, unjustified scope, missing tests, high-risk actions, and unaddressed assumptions. Ask for revisions if needed.
- Choose how to proceed. The documented approval choices include proceeding with automatic edit approval where available, manually reviewing edits as they happen, or continuing to plan.
- Inspect the implementation evidence. Review the diff and relevant tests or other verification. For work needing independent assurance, involve a reviewer rather than treating the plan or automated checks as sufficient.
What plan mode does—and does not—control
The permissions guide says plan mode blocks edits until plan approval, with a documented interactive-terminal exception where bypass permissions are available. Shell-command behavior can also vary: when Auto mode is available and configured for planning, a classifier reviews commands; otherwise, commands outside the built-in read-only set may prompt. Check the guide and the configuration of your specific session rather than assuming all plan sessions handle commands identically.
Other permission modes make different oversight trade-offs. Anthropic says Auto mode reduces prompts but “does not guarantee safety”; its guidance positions Auto for work where you trust the general direction, not as a substitute for review of sensitive operations. dontAsk allows only pre-approved tools and denies actions that would prompt, while bypassPermissions is described for isolated containers and virtual machines. Consult the current permission guide for the behavior applicable to your interface and setup.
When should I add a reviewer?
Plan mode helps you examine an approach before edits, and manual approval can expose individual changes as they happen. Neither necessarily supplies independent, accountable judgment. Add a reviewer when consequences or specialized requirements justify another person checking the work; this is risk-based guidance, not an Anthropic requirement.
- Security-sensitive changes, including authentication or access controls.
- Privacy-sensitive handling of personal or confidential information.
- Changes that could alter or destroy important data.
- Production operations, deployment, or rollback decisions.
- Domain-specific decisions the implementer cannot independently validate.
A useful review checks whether the goal matches the plan, whether the changed files and diff stay within scope, which assumptions remain, what tests or other evidence support the result, and how the change could be rolled back. Anthropic’s Claude Code overview describes code-review workflows; the choice to require a reviewer should depend on the work’s risks and need for specialist judgment.
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