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Claude Code Review & Refactoring: A 2026 Playbook

Separate Code Review from Code Changes

The best starting point for using Claude Code for code review and refactoring in 2026 is a two-stage workflow: investigate first, then authorize a narrowly defined change. Anthropic recommends exploring and planning before implementation, with explicit checks to verify the result. Avoid turning every review finding into an immediate rewrite. ([code.claude.com](https://code.claude.com/docs/en/best-practices))

1. Establish the Baseline and Repository Rules

Before starting, run git status and preserve unrelated work. Identify the intended comparison branch, then run the relevant existing tests. Record pre-existing failures so they do not get misclassified as regressions.

Add concise project instructions to CLAUDE.md: build and test commands, architectural boundaries, compatibility requirements, and generated files that should remain untouched. Claude Code reads these instructions as project context, but they are not enforced security controls. Configure permissions separately. ([code.claude.com](https://code.claude.com/docs/en/memory))

• Specify invariants: public response fields, database transaction boundaries, and error types.
• State exclusions: no dependency upgrades, schema changes, or unrelated formatting.
• Define completion: targeted tests, broader checks, and a human-readable diff summary.

2. Request an Evidence-Based Review

Use Plan Mode for the initial investigation. It supports analysis without ordinary code modifications; review your permission configuration rather than relying on a prompt saying 'do not edit.' Keep command approvals enabled where appropriate. ([support.claude.com](https://support.claude.com/en/articles/14554922-claude-code-user-faq?utm_source=openai))

Try this prompt: 'Review the changes from git diff origin/main...HEAD. Do not modify files. Prioritize correctness, authorization, concurrency, and backward compatibility. Trace changed functions into callers and tests. For each finding, provide file and line, triggering input, observable consequence, and a proposed verification. Separate confirmed defects from hypotheses. Ignore stylistic preferences.'

Replace origin/main with the actual target branch. For uncommitted work, explicitly request both git diff and git diff --cached. Ask for only actionable findings, with pre-existing problems listed separately.

3. Verify Findings Before Refactoring

Require a concrete failure path before approving a fix. For example, if Claude suspects duplicate payment processing, ask which retry sequence reaches the write twice, whether an idempotency constraint already exists, and which test would demonstrate the problem.

Ask Claude to inspect the implementation and existing tests rather than infer behavior from function names. Providing executable verification criteria is a core Claude Code best practice; a plausible explanation alone is not a passing check. ([code.claude.com](https://code.claude.com/docs/en/best-practices))

4. Refactor One Behavior-Preserving Slice

Approve a small plan with named files and explicit invariants. Anthropic's refactoring guidance recommends preserving behavior and proceeding in small, testable increments. Keep a bug fix separate from structural cleanup when practical, so reviewers can distinguish intentional behavior changes from rearranged code. ([code.claude.com](https://code.claude.com/docs/en/common-workflows))

A useful prompt is: 'Extract validation from createOrder into a private helper. Preserve validation order, error messages, HTTP status codes, and transaction boundaries. Do not change dependencies or public signatures. Add characterization tests for current behavior before editing. Stop if preserving behavior requires a broader change.'

Inspect the tests too. Reject weakened assertions, deleted edge cases, or snapshots updated merely to match new output.

5. Validate the Patch, Not Just the Summary

• Run focused regression tests, then the relevant integration suite.
• Run the repository's formatter, linter, type checker, and build where applicable.
• Inspect git diff --stat and git diff --check for unexpected scope and whitespace problems.
• Review authorization, error handling, side effects, and compatibility manually.
• Require exact commands, results, skipped checks, and remaining uncertainty in the handoff.

For a second pass, start a fresh review session with the intended behavior and final diff. Ask specifically for regressions introduced by the refactor, not another redesign.

Keep Review Costs Predictable with 59API

59API offers low-cost, pay-as-you-go access compatible with Claude Code and describes its models as native, official-quality offerings without downgrades. That makes it worth considering for repeated review-and-test cycles, while checking current rates rather than assuming a fixed saving. ([59api.com](https://59api.com/blog/custom-ai-cli-base-urls-claude-code-and-codex-fixes-4161?utm_source=openai))

Choose a listed model such as Claude Sonnet 5.5, then use the exact API identifier from your dashboard. Configure ANTHROPIC_BASE_URL and ANTHROPIC_API_KEY according to 59API's Claude Code instructions before launching the CLI. Keep credentials outside version control and confirm your organization's policy permits sending repository content through a relay. ([59api.com](https://59api.com/blog/custom-ai-cli-base-urls-claude-code-and-codex-fixes-4161?utm_source=openai))

If this workflow fits your team, consider signing up for 59API and evaluating one small, test-covered refactor before expanding usage.

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