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Agent Skills

Agent-Skills.md is a agent skills marketplace, to find the right agent skills for you.

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root-cause-tracing

Use when errors occur deep in execution and you need to trace back to find the original trigger - systematically traces bugs backward through call stack, adding instrumentation when needed, to identify source of invalid data or incorrect behavior

NickCrew
NickCrew
124

webapp-testing

Toolkit for interacting with and testing local web applications using Playwright. Use when verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.

NickCrew
NickCrew
124

api-gateway-patterns

API Gateway patterns for routing, authentication, rate limiting, and service composition in microservices architectures. Use when implementing API gateways, building BFF layers, or managing service-to-service communication at scale.

NickCrew
NickCrew
124

finishing-a-development-branch

Use when implementation is complete, all tests pass, and you need to decide how to integrate the work - guides completion of development work by presenting structured options for merge, PR, or cleanup

NickCrew
NickCrew
124

threat-modeling-techniques

Threat modeling methodologies using STRIDE, attack trees, and risk assessment for proactive security analysis. Use when designing secure systems, conducting security reviews, or identifying potential attack vectors in applications.

NickCrew
NickCrew
124

writing-skills

Use when creating new skills, editing existing skills, or verifying skills work before deployment - applies TDD to process documentation by testing with subagents before writing, iterating until bulletproof against rationalization

NickCrew
NickCrew
124

database-design-patterns

Database schema design patterns and optimization strategies for relational and NoSQL databases. Use when designing database schemas, optimizing query performance, or implementing data persistence layers at scale.

NickCrew
NickCrew
124

cqrs-event-sourcing

CQRS and Event Sourcing patterns for scalable, auditable systems with separated read/write models. Use when building audit-required systems, implementing temporal queries, or designing high-scale applications with complex domain logic.

NickCrew
NickCrew
124

event-driven-architecture

Event-driven architecture patterns with event sourcing, CQRS, and message-driven communication. Use when designing distributed systems, microservices communication, or systems requiring eventual consistency and scalability.

NickCrew
NickCrew
124

tutorial-design

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NickCrew
NickCrew
124

dispatching-parallel-agents

Use when facing 3+ independent failures that can be investigated without shared state or dependencies - dispatches multiple Claude agents to investigate and fix independent problems concurrently

NickCrew
NickCrew
124

development-estimation

Use when estimating time, effort, or complexity for features or projects - provides structured estimation workflows with breakdowns, risks, and confidence intervals.

NickCrew
NickCrew
124

dev-workflows

Use when running builds, executing tests, or improving developer experience workflows - provides structured guidance for build/test execution and DX improvement.

NickCrew
NickCrew
124

async-python-patterns

Python asyncio and concurrent programming patterns for high-performance applications. Use when building async APIs, concurrent systems, or I/O-bound applications requiring non-blocking operations.

NickCrew
NickCrew
124

defense-in-depth

Use when invalid data causes failures deep in execution, requiring validation at multiple system layers - validates at every layer data passes through to make bugs structurally impossible

NickCrew
NickCrew
124

canvas-design

Create beautiful visual art in .png and .pdf documents using design philosophy. Use when the user asks to create a poster, piece of art, design, or other static piece. Create original visual designs, never copying existing artists' work to avoid copyright violations.

NickCrew
NickCrew
124

kubernetes-deployment-patterns

Kubernetes deployment strategies and workload patterns for production-grade applications. Use when deploying to Kubernetes, implementing rollout strategies, or designing cloud-native application architectures.

NickCrew
NickCrew
124

internal-comms

A set of resources to help write all kinds of internal communications, using company-specific formats. Use when asked to write internal communications (status reports, leadership updates, 3P updates, company newsletters, FAQs, incident reports, project updates, etc.).

NickCrew
NickCrew
124

implementation-workflow

Use when turning PRDs or feature specs into actionable implementation workflows - provides structured task decomposition, dependency mapping, and validation gates.

NickCrew
NickCrew
124

helm-chart-patterns

Helm chart development patterns for packaging and deploying Kubernetes applications. Use when creating reusable Helm charts, managing multi-environment deployments, or building application catalogs for Kubernetes.

NickCrew
NickCrew
124

gitops-workflows

GitOps workflows and patterns using ArgoCD and Flux for declarative Kubernetes deployments. Use when implementing CI/CD for Kubernetes, managing multi-environment deployments, or adopting declarative infrastructure practices.

NickCrew
NickCrew
124

condition-based-waiting

Use when tests have race conditions, timing dependencies, or inconsistent pass/fail behavior - replaces arbitrary timeouts with condition polling to wait for actual state changes, eliminating flaky tests from timing guesses

NickCrew
NickCrew
124

code-quality-workflow

Use when assessing or improving code quality, maintainability, performance, or security hygiene - provides workflows for analysis, code review, and systematic improvements with validation steps.

NickCrew
NickCrew
124

feature-implementation

Use when implementing a feature or multi-file code change - provides structured implementation flow with persona selection, validation, and testing guidance.

NickCrew
NickCrew
124

requesting-code-review

Use when completing tasks, implementing major features, or before merging to verify work meets requirements - dispatches superpowers:code-reviewer subagent to review implementation against plan or requirements before proceeding

NickCrew
NickCrew
124

code-explanation

Use when explaining code, concepts, or system behavior to a specific audience level - provides a structured explanation workflow with depth control and validation steps.

NickCrew
NickCrew
124

test-driven-development

Use when implementing any feature or bugfix, before writing implementation code - write the test first, watch it fail, write minimal code to pass; ensures tests actually verify behavior by requiring failure first

NickCrew
NickCrew
124

git-ops

Use when performing git operations or generating smart commit messages - provides safe git workflow guidance, validation checks, and conventional commit formatting.

NickCrew
NickCrew
124

owasp-top-10

OWASP Top 10 security vulnerabilities with detection and remediation patterns. Use when conducting security audits, implementing secure coding practices, or reviewing code for common security vulnerabilities.

NickCrew
NickCrew
124

microservices-patterns

Comprehensive microservices architecture patterns covering service decomposition, communication, data management, and resilience strategies. Use when designing distributed systems, breaking down monoliths, or implementing service-to-service communication.

NickCrew
NickCrew
124

api-design-patterns

Comprehensive REST and GraphQL API design patterns with versioning, pagination, error handling, and HATEOAS principles. Use when designing APIs, defining endpoints, or architecting service contracts requiring production-grade patterns.

NickCrew
NickCrew
124

kubernetes-security-policies

Kubernetes security policies, RBAC, and Pod Security Standards for hardened cluster deployments. Use when implementing cluster security, defining network policies, or enforcing security compliance in Kubernetes environments.

NickCrew
NickCrew
124

testing-anti-patterns

Use when writing or changing tests, adding mocks, or tempted to add test-only methods to production code - prevents testing mock behavior, production pollution with test-only methods, and mocking without understanding dependencies

NickCrew
NickCrew
124

quality-audit

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NickCrew
NickCrew
124

documentation-production

Use when generating, updating, or organizing documentation (component/API docs, project indexes, diagrams, tutorials, learning paths) - provides structured workflows and references for docs generation, indexing, diagrams, and teaching.

NickCrew
NickCrew
124

repo-cleanup

Use when a repository needs cleanup of dead code, build artifacts, unused dependencies, outdated docs, or stale tests - provides safe cleanup workflows, validation steps, and reporting templates for code, deps, docs, tests, and sprint archives.

NickCrew
NickCrew
124

typescript-advanced-patterns

Advanced TypeScript patterns for type-safe, maintainable code using sophisticated type system features. Use when building type-safe APIs, implementing complex domain models, or leveraging TypeScript's advanced type capabilities.

NickCrew
NickCrew
124

user-journey-mapping

Create comprehensive user journey maps that identify pain points, opportunities, and emotional states across touchpoints. Use when mapping user experiences or analyzing conversion flows.

NickCrew
NickCrew
124

using-git-worktrees

Use when starting feature work that needs isolation from current workspace or before executing implementation plans - creates isolated git worktrees with smart directory selection and safety verification

NickCrew
NickCrew
124

using-superpowers

Use when starting any conversation - establishes mandatory workflows for finding and using skills, including using Skill tool before announcing usage, following brainstorming before coding, and creating TodoWrite todos for checklists

NickCrew
NickCrew
124

ux-review

Multi-perspective UX review combining usability, accessibility, and interaction design analysis.

NickCrew
NickCrew
124

verification-before-completion

Use when about to claim work is complete, fixed, or passing, before committing or creating PRs - requires running verification commands and confirming output before making any success claims; evidence before assertions always

NickCrew
NickCrew
124

vibe-security

This skill helps Claude write secure web applications. Use when working on any web application to ensure security best practices are followed.

NickCrew
NickCrew
124

visual-modes

Use when activating visual showcase modes (supersaiyan, kamehameha, over9000) for UI or interaction design - provides mode-specific enhancement checklists.

NickCrew
NickCrew
124

workflow-bug-fix

Systematic approach to identifying, fixing, and validating bug fixes. Use when fixing bugs, resolving issues, or addressing errors.

NickCrew
NickCrew
124

workflow-feature

Complete feature development workflow from design to deployment. Use when implementing new features or functionality.

NickCrew
NickCrew
124

workflow-performance

Systematic performance analysis and optimization. Use when things are slow, need optimization, or preparing for scale.

NickCrew
NickCrew
124

workflow-security-audit

Comprehensive security assessment and remediation. Use for security reviews, compliance checks, vulnerability assessments.

NickCrew
NickCrew
124

workflow-feature-development

Complete workflow for developing new features from design to deployment. Use when starting a new feature, adding functionality, or building something new.

NickCrew
NickCrew
124

tool-selection

Use when selecting between MCP tools based on task complexity and requirements - provides a structured selection workflow and decision rationale.

NickCrew
NickCrew
124

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Adoption

Agent Skills are supported by leading AI development tools.

FAQ

Frequently asked questions about Agent Skills.

01

What are Agent Skills?

Agent Skills are reusable, production-ready capability packs for AI agents. Each skill lives in its own folder and is described by a SKILL.md file with metadata and instructions.

02

What does this agent-skills.md site do?

Agent Skills is a curated directory that indexes skill repositories and lets you browse, preview, and download skills in a consistent format.

03

Where are skills stored in a repo?

By default, the site scans the skills/ folder. You can also submit a URL that points directly to a specific skills folder.

04

What is required inside SKILL.md?

SKILL.md must include YAML frontmatter with at least name and description. The body contains the actual guidance and steps for the agent.

05

How can I submit a repo?

Click Submit in the header and paste a GitHub URL that points to a skills folder. We’ll parse it and add any valid skills to the directory.