Claude Code Prompts: Debugging, Refactors, Tests and Agents
Copy practical Claude Code prompts for repo exploration, debugging, test writing, refactors, code review, subagents, hooks, permissions, and safe commits.
Michael Okeje
Reviewed against current Anthropic Claude Code docs for hooks, subagents, settings, and permissions · Last updated May 27, 2026
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How we tested this
Reviewed against Claude Code docs in May 2026
We refreshed this guide using Anthropic and Claude Code documentation for hooks, subagents, settings, permissions, and power-user workflows.
The prompts are written for real repositories: explore first, plan, edit narrowly, verify, summarize, and avoid destructive operations without approval.
How to use these prompts
Prompt Claude Code like a senior engineer. Give the goal, files or areas in scope, commands it may run, commands it must avoid, verification expectations, and the form of the final summary.
Prompt map
Workflows and starter prompts
Use these workflows to keep coding-agent work focused, auditable, and safe.
| Job | Prompt focus | Starter prompt | Human check |
|---|---|---|---|
| Repo exploration | where to inspect, what to report, no edits | Explore this repo for [feature]. Read the relevant files, explain the architecture, identify likely edit points, and do not change files yet. | Check that the proposed edit points match the actual ownership boundaries. |
| Bug fix | reproduction, root cause, focused patch, tests | Reproduce this bug, identify the root cause, make the smallest safe fix, add or update a focused test, and run the relevant checks. | Read the diff before committing or deploying. |
| Refactor | behavior unchanged, scope, tests | Refactor [area] to reduce duplication without changing behavior. Keep the patch scoped, preserve public APIs, and run tests. | Compare before/after behavior and avoid opportunistic rewrites. |
| Code review | bugs, regressions, tests, security | Review this diff for bugs, behavioral regressions, missing tests, security issues, and deployment risk. Findings first, with file and line references. | Decide which findings are real before asking for edits. |
| Hooks and agents | permission boundaries, automation, lifecycle | Design a Claude Code hook or subagent workflow for [task]. Include purpose, trigger, allowed tools, denied tools, failure behavior, and setup steps. | Test hooks in a safe repo before team rollout. |
Copy this first
The reusable prompt
Exploration and planning prompts
Use these before editing so the agent understands the codebase.
Prompt 1
Map how [feature] works from route to data layer. List files, responsibilities, and likely change points. Do not edit.
Prompt 2
Find every place [concept] is used. Group by read path, write path, tests, and UI. Recommend the safest edit order.
Prompt 3
Explain this failing behavior from the code. Give 3 hypotheses and the quickest command or file read to test each one.
Prompt 4
Create an implementation plan for [task] with file-level scope, tests, risk, and rollback notes.
Debugging and test prompts
Good coding-agent prompts make verification explicit.
Prompt 1
Reproduce this bug with the smallest test or command. Show the failing path, fix it, and rerun only relevant checks.
Prompt 2
Add regression coverage for [bug]. The test should fail before the fix and pass after it.
Prompt 3
Audit this module for edge cases around null, empty, async failure, permissions, and invalid input.
Prompt 4
Explain why this test is flaky and make it deterministic without weakening the assertion.
Refactor and review prompts
Constrain the agent so it improves code without expanding the blast radius.
Prompt 1
Refactor this duplicated logic into the smallest local helper. Preserve behavior and public APIs.
Prompt 2
Review this PR like a senior engineer. Prioritize bugs, regressions, security, and missing tests.
Prompt 3
Make this component easier to read without changing UI behavior. Keep styling and props stable.
Prompt 4
Prepare a release summary from this diff with user impact, migration notes, tests, and rollback risk.
What to check before accepting Claude Code changes
FAQs
What is the best prompt format for Claude Code?
Use goal, repo context, scope, constraints, allowed commands, verification, and final summary format. Tell it when to inspect first and when it may edit.
Can Claude Code use subagents?
Yes. Claude Code docs describe custom subagents with their own context window, system prompt, tool access, and permissions.
What are Claude Code hooks?
Hooks let you run commands at lifecycle points such as before or after tool use. They are useful for checks, formatting, permissions, or guardrails.
How do I make Claude Code safer?
Scope files, deny destructive commands, define allowed checks, require a plan before edits, and inspect the diff before committing.
Can Claude Code write tests?
Yes. The best prompt asks it to reproduce the bug, add focused regression coverage, fix the code, and run relevant tests.
Should Claude Code commit automatically?
Only if you explicitly ask and after reviewing the diff and test results. For shared repos, avoid committing unrelated active work.
What should go in CLAUDE.md?
Use it for project-specific commands, architecture notes, conventions, test instructions, and safety rules that should persist across sessions.
What is the main Claude Code prompting mistake?
The main mistake is asking for a broad change without scope or verification. Good prompts define what to touch, what not to touch, and how to prove it works.