harness-engineering
Repository structure methodology for maximum AI agent effectiveness. Three pillars — context engineering (repo as knowledge product), architectural constraints (deterministic enforcement), garbage collection (active entropy fighting). Use when setting up repos for AI development, diagnosing repeated agent failures, writing AGENTS.md, or designing CI gates and structural tests.
hetzner-coder
This skill guides provisioning Hetzner Cloud infrastructure with OpenTofu/Terraform. Use when creating servers, networks, firewalls, load balancers, or volumes on Hetzner Cloud.
hierarchical-agents
Generate hierarchical AGENTS.md structure for codebases to optimize AI agent token usage. Use when creating AGENTS.md files, documenting codebase structure, setting up agent guidance, organizing project documentation for AI tools, implementing JIT indexing, or working with monorepos that need lightweight root guidance with detailed sub-folder documentation. Covers repository analysis, root AGENTS.md generation, sub-folder AGENTS.md creation, and token-efficient documentation patterns.
hotwire-coder
Use when implementing Hotwire features with Turbo Drive, Turbo Frames, and Turbo Streams. Applies Rails 8 conventions, morphing, broadcasts, lazy loading, and real-time update patterns.
inertia-coder
Build modern SPAs with Inertia.js and Rails using React, Vue, or Svelte. Use when creating Inertia pages, handling forms with useForm, managing shared props, or implementing client-side routing. Triggers on Inertia.js setup, SPA development, or React/Vue/Svelte with Rails.
infra-security-review
Security patterns and checklists for reviewing Infrastructure-as-Code. Covers Terraform/OpenTofu state, secrets, network, compute, database, and storage security.
init-agents-config
Generate .agents.yml config from user answers. Provides tech stack templates for Rails, Python, Node, and Generic projects.
kamal-coder
This skill guides deploying Rails applications with Kamal 2. Use when configuring deploy.yml, setting up kamal-proxy, managing secrets, accessories, or preparing servers for container deployment.
layered-rails
Design Rails applications using layered architecture. Use when analyzing codebases for architecture violations, planning feature implementations, deciding where code belongs, or extracting abstractions from fat models/controllers. Complements dhh-coder (which keeps things simple) with guidance for when complexity demands structure.
lint
Run linting and code quality checks on Ruby and ERB files. Use before pushing to origin.
litestream-coder
This skill guides configuring Litestream for continuous SQLite backup in Rails 8+ apps. Use when setting up production backups for SQLite databases (Solid Queue, Solid Cache, Solid Cable).
mcp-oauth-setup
Implement MCP server authentication with OAuth Dynamic Client Registration (RFC 7591), Authorization Server Metadata Discovery (RFC 8414), and per-agent credential support. Use when building admin UIs that let users connect to third-party MCP servers using OAuth (Linear, Sentry, Granola), bearer tokens (Render, custom APIs), or API keys. Covers metadata discovery, client registration, PKCE authorization, token exchange, token refresh, tool sync, and credential storage patterns.
mermaid-builder
Expert guidance for creating syntactically correct Mermaid diagrams. Use when creating flowcharts, sequence diagrams, class diagrams, state diagrams, Gantt charts, ER diagrams, or data lineage visualizations.
minitest-coder
Write Minitest tests for Ruby and Rails applications. Use when creating test files, writing test cases, or testing new features. Not for RSpec — use rspec-coder instead. Covers both traditional and spec styles, fixtures, mocking, and Rails integration testing patterns.
multi-agent-architecture
Patterns for designing multi-agent systems with Claude Code - job description method, shared folder communication, handbook consolidation, context management. Use when building complex agent orchestrations.
onepassword-cli-coder
This skill guides integrating 1Password CLI (op) for secret management in development workflows. Use when loading secrets for infrastructure, deployments, or local development.
opentofu-coder
This skill guides writing Infrastructure as Code using OpenTofu (open-source Terraform fork). Use when creating .tf files, managing cloud infrastructure, configuring providers, or designing reusable modules.
pandas-coder
DataFrame manipulation with chunked processing, memory optimization, and vectorized operations.
pandera-validation
DataFrame schema validation using pandera. Schema definitions, column checks, and decorator-based validation.
parquet-coder
Columnar file patterns including partitioning, predicate pushdown, and schema evolution.
performance-reviewer
Analyze Rails code for performance issues, optimize queries, identify bottlenecks, and ensure scalability. Apply after implementing features or when performance concerns arise.
plan-builder
Write implementation plans with appropriate templates based on complexity. Use when planning features or changes. Provides minimal, standard, and full templates for different scope levels.
plan-review
Review development plans for issues, missing considerations, architectural violations, and alternatives. Includes SOLID compliance, circular dependency detection, and coupling analysis.
pragmatic-rails-reviewer
Review Rails code with high quality bar. Strict for modifications, pragmatic for new isolated code.
pr-comment-resolver
Address PR review comments by implementing reviewer feedback and suggestions.
privacy-reviewer
Review PII handling, encryption, and GDPR/CCPA compliance in Rails applications.
pr-screenshot-docs
Capture and document UI changes with before/after screenshots for pull requests. Use when creating PRs that include visual changes to ensure reviewers can assess design modifications.
pydantic-validation
Record-level data validation using Pydantic models. Field validators, model validators, and batch validation patterns.
pytest-coder
Write pytest tests with fixtures, parametrization, mocking, async testing, and modern patterns. Use when creating or updating Python test files. Not for unittest — use standard library patterns instead.
python-coder
Modern Python 3.12+ development with uv, ruff, and production-ready practices. Routes to specialized skills for frameworks and testing.
python-debugger
Debug Python errors, exceptions, and unexpected behavior. Analyzes tracebacks, reproduces issues, identifies root causes, and provides fixes.
python-reviewer
Review Python code with high quality bar for type hints, Pythonic patterns, and maintainability.
rails-activity-timeline
Use when adding polymorphic activity timelines with live Turbo Stream updates to any Rails model. Covers migration, model, concern, shared partials, broadcasting, and optional AI-generated change summaries. Triggers on activity feed, audit trail, timeline, field change tracking, or Turbo Stream broadcasting patterns.
rails-conventions
Rails code patterns and conventions following rubocop-rails-omakase style.
rails-debugger
Use proactively when encountering Rails errors, test failures, build issues, or unexpected behavior. Analyzes errors, reproduces issues, and identifies root causes.
rails-refactorer
Use proactively when refactoring Ruby on Rails code. Applies Rails conventions, Sandi Metz rules, and idiomatic Ruby patterns while maintaining test coverage.
rails-tiptap-autosave
Use when adding Tiptap rich text editing with debounced autosave to Rails models. Stores markdown in text columns (not ActionText). Triggers on rich text editor, Tiptap, autosave, inline editing, or markdown content fields. Not for ActionText or basic textarea inputs.
react-coder
Write modern React components with TypeScript, hooks, and best practices. Creates functional components, custom hooks, and follows composition patterns.
react-patterns
Expert guidance on modern React patterns including hooks, composition, state management, and concurrent features. Use when implementing React components or refactoring existing code.
react-testing
Testing patterns for Vitest, React Testing Library, and Jest. Routes to component, hook, and integration test examples.
readme-craft
Production-grade README.md patterns for any project type. Use when creating project documentation, writing README files, or improving existing docs. Covers hero sections, quick start examples, comparison tables, troubleshooting guides, and limitation transparency. Triggers on README, documentation, project setup, open source.
reasoning-verifier
Verify LLM reasoning using Reverse Chain-of-Thought (RCoT) to detect overlooked conditions.
research-compound
Automatically check and update folder-specific AGENTS.md during research. Before investigating a domain, read nearest AGENTS.md for existing context. After discovering valuable patterns, append learnings to that file.
rp-reviewer
Code review using RepoPrompt MCP (chat_send mode=review). Returns structured verdict.
rspec-coder
Write RSpec tests for Ruby and Rails applications. Use when creating spec files, writing test cases, or testing new features. Not for Minitest — use minitest-coder instead. Covers RSpec syntax, describe/context organization, subject/let patterns, fixtures, mocking with allow/expect, and shoulda matchers.
rubocop-fixer
Use when fixing Rubocop violations. Runs Rubocop to identify issues, applies fixes following project conventions, and explains non-obvious corrections.
ruby-coder
This skill guides writing of new Ruby code following modern Ruby 3.x syntax, Sandi Metz's 4 Rules for Developers, and idiomatic Ruby best practices. Use when creating new Ruby files, writing Ruby methods, or refactoring Ruby code to ensure adherence to clarity, simplicity, and maintainability standards.
schema-discoverer
Infer schema from sample data files (CSV, JSON, Parquet) and generate type definitions.
session-checkpoint
Save session state to ledger file for continuity across crashes, context switches, or /clear + reload cycles.
simplicity-reviewer
Final review for code simplicity. Identifies anti-patterns, code smells, and YAGNI violations.
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