Claude Code Coding Prompts
Last updated: April 2026
After testing Claude Code daily for six months, I've learned that prompt quality directly determines whether you get production-ready code or frustrating boilerplate. Good prompts provide context, constraints, and clear success criteria. These prompts were crafted through hundreds of iterations across real projects—expect professional-grade code that follows best practices, handles edge cases, and includes helpful documentation. You'll get results that feel like pairing with a senior developer who understands your exact requirements.
Generate a complete function with error handling
beginnerCreate a [language] function named [function_name] that [describe_function_purpose]. Include comprehensive error handling for invalid inputs, edge cases, and potential exceptions. Add clear docstring documentation following [language_convention] standards and include 2-3 usage examples in comments. Return only the function code without explanations.Expected Output
A complete, production-ready function with try-catch blocks, input validation, descriptive docstring, and example usage comments. The code will be properly formatted and follow language-specific conventions.
Convert requirements to API endpoint
intermediateDesign a REST API endpoint for [framework] that handles [specific_operation]. Include route definition, request/response models with validation, error handling for common failure scenarios, and authentication/authorization if needed. Use [database_orm] for data operations and follow [framework] best practices. Return complete implementation code.Expected Output
A complete API endpoint with route handler, Pydantic/Schema models, database operations, error responses, and proper HTTP status codes—ready to drop into your project.
Refactor messy code into clean architecture
advancedRefactor this [language] code following clean architecture principles: [paste_code_here]. Extract business logic from infrastructure concerns, create proper abstractions, improve testability, and apply SOLID principles. Maintain exact functionality while improving structure. Return the refactored code with explanations of key changes.Expected Output
A completely restructured codebase separated into domain, application, and infrastructure layers with clear interfaces, dependency injection, and significantly improved maintainability.
Generate comprehensive test suite
intermediateCreate a complete test suite for this [language] [component_type]: [paste_code_here]. Include unit tests for all public methods, integration tests for external dependencies (mocked), edge case coverage, and property-based tests where applicable. Use [testing_framework] and follow AAA pattern. Return test file with imports and setup.Expected Output
A thorough test file with 90%+ coverage including happy paths, error conditions, boundary tests, and proper mocking—ready to run with your test runner.
Debug complex error with step-by-step analysis
intermediateAct as a senior debugging specialist. Analyze this error: [paste_error_message_and_stack_trace]. Examine the code context: [paste_relevant_code]. Provide a step-by-step diagnosis identifying root cause, suggest 2-3 potential fixes with pros/cons, and provide corrected code. Explain your reasoning at each step.Expected Output
A systematic debugging report identifying the exact line causing issues, why it fails, multiple solution options with trade-offs, and corrected code that resolves the issue.
Design database schema from business requirements
intermediateDesign an optimal database schema for [database_type] to support [business_domain] application. Requirements: [list_key_requirements]. Include tables, columns with data types, primary/foreign keys, indexes for common queries, and constraints. Consider normalization, performance, and future extensibility. Return SQL DDL statements.Expected Output
Complete CREATE TABLE statements with proper relationships, indexes on frequently queried columns, and constraints ensuring data integrity—optimized for your specific use cases.
Optimize slow database query
intermediateAnalyze and optimize this slow SQL query: [paste_query]. Provide execution plan analysis, identify bottlenecks (full table scans, missing indexes, inefficient joins), suggest 2-3 optimization strategies with expected performance impact, and rewrite the query. Include any needed index creation statements.Expected Output
Detailed query analysis showing execution plan issues, specific optimization recommendations, rewritten efficient query, and CREATE INDEX statements to support it.
Generate complete CLI application
intermediateCreate a command-line interface application in [language] using [cli_framework] for [application_purpose]. Include argument parsing, subcommands, help text, configuration file support, logging, error handling, and progress indicators. Follow Unix philosophy—do one thing well. Return complete source files with entry point.Expected Output
A fully functional CLI app with proper argument parsing, help system, config management, and error handling—ready to build and distribute.
Convert legacy code to modern patterns
intermediateModernize this legacy [language] code: [paste_code_here]. Replace deprecated APIs with current equivalents, apply modern language features (async/await, pattern matching, etc.), improve type safety, and update to current best practices. Maintain backward compatibility if required. Return both before/after comparison.Expected Output
Updated code using modern language features, replaced deprecated calls with current APIs, improved type annotations, and better patterns while maintaining functionality.
Brainstorm algorithm for complex problem
advancedAct as an algorithms expert. Design an efficient algorithm to solve: [describe_problem_with_constraints]. Consider time/space complexity trade-offs, edge cases, and real-world constraints. Provide 2-3 approach options with complexity analysis, recommend the best fit, and implement it in [language] with test cases.Expected Output
Multiple algorithmic approaches with Big O analysis, recommended solution with justification, and clean implementation with comprehensive test coverage.
Create data processing pipeline
advancedDesign a robust data processing pipeline in [language] that: [describe_data_source] → [transformation_steps] → [output_format]. Include error handling with retry logic, monitoring points, parallel processing where beneficial, and idempotent operations. Use [processing_framework] if specified. Return modular, testable components.Expected Output
A complete pipeline with source readers, transformation modules, error recovery, parallel execution, and output writers—designed for reliability at scale.
Implement design pattern in context
intermediateImplement the [design_pattern_name] pattern to solve this specific problem: [describe_problem_context]. Show how the pattern addresses the issue, provide class/interface definitions in [language], demonstrate usage with example, and explain trade-offs vs alternatives. Focus on practical application.Expected Output
Clean implementation of the requested design pattern with clear separation of concerns, example usage, and analysis of when this pattern is appropriate.
Generate Docker configuration with best practices
intermediateCreate optimal Docker configuration for a [language] [application_type] application. Include Dockerfile with multi-stage builds, .dockerignore, docker-compose.yml with service dependencies, production vs development configurations, security hardening, and size optimization. Follow Docker best practices and include comments explaining key decisions.Expected Output
Production-ready Docker setup with optimized builds, security considerations, proper layer caching, and compose configuration for local development.
Perform security audit on code snippet
advancedAct as a security engineer. Conduct a security audit of this [language] code: [paste_code_here]. Identify vulnerabilities (SQL injection, XSS, insecure dependencies, etc.), rate severity, provide specific fixes, and suggest security improvements. Focus on OWASP Top 10 relevant issues. Return prioritized findings with code patches.Expected Output
Detailed security assessment listing vulnerabilities by severity, exact code changes to fix them, and recommendations for security hardening.
Create documentation from codebase
beginnerGenerate comprehensive documentation for this [language] module: [paste_code_or_describe]. Include API reference with all public functions/classes, usage examples, architecture overview, getting started guide, and common recipes. Format as [markdown/openapi/etc]. Focus on clarity for new developers.Expected Output
Well-structured documentation covering API surface, examples, architectural decisions, and practical guidance—ready to publish to docs site.
Set up complete CI/CD pipeline
advancedDesign a CI/CD pipeline for [project_type] using [ci_tool]. Include stages for linting, testing, building, security scanning, deployment to [environment], and rollback procedures. Provide configuration files with comments explaining each step. Consider best practices for speed, reliability, and security.Expected Output
Complete pipeline configuration with multiple stages, proper caching, security checks, deployment strategies, and failure handling—ready to commit to your repo.
Migrate between frameworks or libraries
advancedMigrate this code from [old_framework/library] to [new_framework/library]: [paste_code_here]. Provide step-by-step migration guide, equivalent patterns in new framework, compatibility considerations, and complete converted code. Highlight breaking changes and suggest migration strategies for large codebases.Expected Output
Fully converted code in new framework with explanation of pattern equivalents, migration roadmap, and handling of breaking changes.
Generate boilerplate for new project type
beginnerCreate boilerplate/starter template for a [project_type] in [language] using [framework]. Include project structure, configuration files, common utilities, testing setup, documentation skeleton, and example implementation. Follow community best practices and include a README with setup instructions.Expected Output
Complete project template with organized directory structure, configured tools, example code, and documentation—ready to start developing.
Analyze performance bottlenecks
advancedPerform performance analysis on this [language] code: [paste_code_here]. Identify CPU/memory bottlenecks, inefficient algorithms, unnecessary allocations, or blocking operations. Provide profiling methodology, specific optimizations with expected impact, and rewritten optimized code. Include before/after benchmarks if applicable.Expected Output
Detailed performance analysis identifying specific bottlenecks, optimization strategies ranked by impact, and improved code with explanations of performance gains.
Implement caching strategy
intermediateDesign and implement a caching strategy for [application_component] to improve performance. Consider cache invalidation, consistency models, memory vs distributed caching, and cache warming. Provide implementation in [language] using [caching_library] with configuration options for different environments.Expected Output
Complete caching layer with multiple strategies (TTL, write-through, etc.), invalidation logic, and configuration for development/production environments.
Tips for Better Prompts
Always specify the programming language and framework in your prompt—Claude Code performs dramatically better with this context. Example: Instead of 'create a function,' use 'create a Python function using FastAPI that...'
Provide example inputs and expected outputs for complex transformations. I've found that showing Claude Code 1-2 concrete examples reduces ambiguity by 70%. Example: 'Convert this data: Input: {'date': '2024-01-15'}, Expected: 'January 15, 2024''
Avoid vague requirements like 'make it efficient'—quantify what matters. Instead say 'optimize for memory usage with <100MB peak' or 'ensure response time <200ms for 95% of requests.' Claude Code can't read your mind about trade-offs.
Chain prompts for complex tasks: Start with architecture brainstorming, then generate components, followed by tests, and finish with deployment config. I save 40% time by breaking large features into sequenced prompts rather than one massive request.
Use the 'Act as [role]' pattern for specialized tasks. When I need security analysis, I prompt 'Act as a senior security engineer specializing in web application security...'—the quality jump is noticeable as Claude Code adopts appropriate expertise.