11 systematic skills for Claude Code — structured protocols for debugging, code review, security, refactoring, testing, deployment, and more. No vibes, just discipline.
Skill Claude CodeCodex
API design standards — consistent, predictable, documented endpoints. Use this skill whenever the user is building, reviewing, or planning an API. Also use when they mention REST endpoints, API routes, request/response shapes, status codes, pagination, versioning, or say things like 'design the API', 'what should this…
Skill Claude CodeCodex
New project initialization protocol — from empty directory to production-ready foundation in one session. Use this skill whenever the user wants to start a new project, initialize a repo, scaffold an application, or set up a codebase from scratch. Also use when they say 'new project', 'start fresh', 'initialize a…
Skill Claude CodeCodex
Systematic code review protocol — review code with rigor and specificity. Use this skill whenever the user asks you to review code, check a PR, audit a file, look over changes, or give feedback on implementation quality. Also use when they say 'review this', 'is this code good', 'check my work', 'what do you think of…
Skill Claude CodeCodex
Systematic debugging protocol — diagnose, isolate, and fix bugs with discipline. Use this skill whenever the user reports a bug, error, crash, or unexpected behavior. Also use when they say things like 'this is broken', 'not working', 'something's wrong', 'fix this', 'why is this failing', or share an error message or…
Skill Claude CodeCodex
Deployment protocol — safe, observable, reversible releases from main to production. Use this skill whenever the user is deploying, releasing, shipping, or pushing to production. Also use when they say 'deploy this', 'ship it', 'push to production', 'release', 'go live', 'pre-deploy check', 'rollback', 'feature…
Skill Claude CodeCodex
Documentation lifecycle protocol — living docs that stay current and traceable. Use this skill whenever the user needs to create, update, or organize project documentation. Also use when they say 'update the docs', 'write documentation', 'update the changelog', 'document this', 'add to the README', 'architecture…
Skill Claude CodeCodex
Data and schema migration protocol — safe, reversible, verified migrations. Use this skill whenever the user needs to do a database migration, schema change, data transformation, platform move, or major dependency upgrade. Also use when they say 'add a column', 'change the schema', 'upgrade the database', 'move to a…
Skill Claude CodeCodex
Performance optimization protocol — measure first, optimize second, verify always. Use this skill whenever the user reports something is slow, asks about performance, wants to optimize, or mentions load times, bundle size, rendering speed, memory usage, or database query performance. Also use when they say 'this is…
Skill Claude CodeCodex
Safe refactoring protocol — restructure code without breaking behavior. Use this skill whenever the user asks to refactor, restructure, reorganize, clean up, simplify, or decompose code. Also use when they say 'this file is too big', 'too much duplication', 'split this up', 'make this cleaner', 'reduce complexity', or…
Skill Claude CodeCodex
Security review protocol — systematic checks for common vulnerabilities and security hygiene. Use this skill whenever the user asks about security, wants a security audit, mentions vulnerabilities, OWASP, XSS, SQL injection, authentication issues, or secrets management. Also use when they say 'is this secure', 'check…
Skill Claude CodeCodex
Testing strategy and implementation protocol — structured quality assurance that catches real bugs. Use this skill whenever the user asks to write tests, add test coverage, set up a testing strategy, or asks 'how should I test this'. Also use when they say 'add tests', 'write tests for this', 'test coverage', 'what…