Security Review Review this code for security issues. Focus on: input validation, SQL injection, XSS, auth, secrets management. List findings by severity. [CODE] Performance Review Identify performance bottlenecks. Suggest specific improvements. Estimate impact. [CODE] Style Review Review against [STYLE GUIDE / LANGUAGE CONVENTIONS]. List violations. [CODE]

Find the Bug This code [DESCRIBE EXPECTED BEHAVIOR] but actually [ACTUAL BEHAVIOR]. Find the bug. Walk through execution step by step. [CODE] Explain Error This error: [ERROR]. Possible causes? How to fix? [STACK TRACE] Reproduce Issue Help me write a minimal reproduction for this bug. The original code does [X]. The bug is [Y].

Write Unit Tests Write comprehensive unit tests for this function. Cover happy path, edge cases, error cases. Use [JEST / PYTEST / etc.]. [CODE] Write Integration Tests Write integration tests for this API endpoint. Test auth, validation, success, errors. Use [FRAMEWORK]. [CODE] Improve Test Coverage Identify untested paths. Write tests for them. [CODE + EXISTING TESTS]

Design System Design a [SYSTEM TYPE]. Requirements: [LIST]. Constraints: [LIST]. Propose architecture with components, data flow, key tradeoffs. Database Schema Design a database schema for [USE CASE]. Include relationships, indexes, constraints. Explain tradeoffs. API Design Design REST API for [DOMAIN]. Include endpoints, request/response shapes, status codes, auth, rate limiting.

Docstrings Add JSDoc / docstrings to this code. Include params, returns, throws, examples. [CODE] README Write a README for this project: overview, install, usage, API, contributing, license. [PROJECT INFO] Architecture Decision Record Write an ADR for [DECISION]. Sections: context, decision, consequences, alternatives.

Language Translation Translate this code from [LANG A] to [LANG B]. Preserve behavior. Adapt to idioms. [CODE] Framework Migration Migrate this from [FRAMEWORK A] to [FRAMEWORK B]. Preserve features. Explain changes. [CODE] Version Upgrade Upgrade this code from [OLD VERSION] to [NEW VERSION]. Note breaking changes. [CODE]

Write Query Write a SQL query that [DESCRIPTION]. Schema: [TABLES + COLUMNS]. Optimize Query This query [QUERY] is slow. Optimize it. Schema: [TABLES + INDEXES]. EXPLAIN: [PLAN]. Index Suggestion Suggest indexes for these common queries: [QUERIES]. Schema: [TABLES].

Add Logging Add structured logging to this code. Use [WINSTON / STRUCTLOG]. Include relevant context. [CODE] Add Monitoring Add observability: traces, metrics, error tracking. Use [SENTRY / DATADOG]. [CODE] Add Caching Identify where caching would help. Implement with [REDIS]. Address cache invalidation. [CODE]

Python to TypeScript Translate Python to TypeScript. Preserve behavior. Use [STRICT TYPES]. [CODE] Cobol to Modern Translate this Cobol to [TARGET LANGUAGE]. Preserve business logic. [CODE]

Best Claude Prompts for Coding 2026 — Guide

Best Claude Prompts for Coding 2026

50+ battle-tested Claude prompts for coding tasks. Refactoring Improve Code Quality Refactor this code to be more readable and maintainable. Don't change behavior. Highlight any potential issues you find. CODE Apply SOLID Principles Refactor this code to follow SOLID principles. Explain each change. CODE Extract Functions Break this function into smaller, focused functions. Each should do one thi…

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