Claude Code Skills·Claude Skills·The open SKILL.md registry for Claude
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134 Claude Code skills authored by marvinrichter.

updated 2026-07-06 · showing 1–60 of 134 by quality score

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CLI tool design patterns for Node.js (yargs/commander), Python (click/typer/argparse), Go (cobra/pflag), and Rust (clap).
Argo Rollouts patterns for canary and blue/green deployments — traffic splitting, automated analysis with Prometheus metrics, rollback triggers, and GitOps integration.
How the agent evolution system works — capturing instincts, promoting them to agent overlays, approval workflow, rollback, and the full continuous-learning flywheel pipeline
ExUnit testing patterns, Mox for mocking, StreamData for property-based testing, and Phoenix test cases for Elixir applications.
Full product development lifecycle from raw idea to shipped implementation. Covers idea capture, evaluation (Go/No-Go), solution design (ADR), PRD writing, and handoff to the…
Bash script testing with BATS (Bash Automated Testing System): test structure, assertions, setup/teardown, mocking external commands, CI integration, and coverage strategies.
Idiomatic Scala patterns: ADTs with sealed traits and case classes, typeclass pattern, Option/Either/Try error handling, for-comprehensions, Cats Effect (IO, Resource, Ref,…
Open source project governance: GitHub issue/PR templates, CODEOWNERS, CONTRIBUTING.md structure, community health files, label taxonomy, branch protection rules, and automated…
Micro-frontend patterns — team topology decisions, Module Federation (webpack/Vite), integration strategies (iframe/web components/JS orchestration), shared state minimization,…
Agent reliability anti-patterns — retrying non-retryable errors, fixed sleep vs exponential backoff with jitter, single timeout for all call stack levels, aggressive circuit…
CLI user experience patterns: error messages that guide (not just report), help text design, autocomplete setup, config file hierarchy (~/.config/<tool>), environment variable…
Advanced Go patterns — hexagonal architecture with full working examples, struct design (functional options, embedding), memory optimization, Go tooling (golangci-lint), Go 1.21+…
C testing patterns: Unity framework (TEST_ASSERT_*), CMocka mocking with __wrap_ and linker flag, Valgrind leak checking, AddressSanitizer, CMake CTest integration, test…
Domain-Driven Design tactical patterns for Java 25+. Value Objects, Entities, Aggregates, Domain Services, Domain Events, Ubiquitous Language, and Bounded Contexts.
Backstage patterns: Software Catalog (catalog-info.yaml, kinds, relations, lifecycle), TechDocs (MkDocs, techdocs-cli), Scaffolder templates (CSF3, steps, fetch:template,…
Write CFP (Call for Papers/Proposals) abstracts and speaker bios that get accepted. Covers hook sentences, problem framing, audience-fit statements, concrete takeaways, and…
Real-time communication patterns: WebSocket with reconnection and presence, Server-Sent Events (SSE) for one-way streaming, long polling fallback, room-based pub/sub, connection…
MLOps lifecycle patterns — experiment tracking (MLflow/W&B), model registry, FastAPI serving with canary deployments, drift detection, fine-tuning workflows, retraining pipelines,…
Cursor and offset pagination, filtering operators, multi-field sorting, full-text search, and sparse fieldsets for REST APIs.
Domain-Driven Design tactical patterns for TypeScript. Value Objects, Entities, Aggregates, Domain Services, Domain Events, Ubiquitous Language, and Bounded Contexts.
Advanced Hexagonal Architecture anti-patterns for TypeScript — domain importing framework dependencies, use cases depending on concrete adapters, HTTP handlers bypassing use…
Advanced Android/Jetpack Compose patterns — Compose performance optimization (@Stable/@Immutable, derivedStateOf, key in LazyColumn, lambda capture hoisting), Coroutines with…
Agent Reliability Patterns: retry with exponential backoff and jitter, timeout hierarchies (tool < agent < workflow), fallback chains, circuit breaker for agent calls, cost…
Hexagonal architecture (ports & adapters) for Java Spring Boot. Package structure, port definitions, use case implementation, adapter patterns, and testing strategy.
Staged learning path for clarc — Day 1 survival commands, Week 1 workflow integration, Month 1 advanced agents. Includes solo, team, and role-specific paths.
Playwright E2E test patterns for Web3 and blockchain features — mocking wallet providers (MetaMask, Phantom), testing wallet connection flows, and handling async blockchain…
Claude API cost awareness — token estimation, cost drivers, and efficiency strategies for Claude Code sessions
Motion and animation patterns for web: CSS transitions for simple interactions, Framer Motion for complex orchestrated animations, meaningful vs.
Advanced Ruby patterns — DDD with domain objects, Sorbet type system, value objects, event sourcing, background jobs, and API response standards with RFC 7807.
Test data management patterns: factory functions, fixtures, database seeders, test isolation strategies, and safely anonymizing production data for testing.
Engineering effectiveness metrics: DORA Four Keys (Deployment Frequency, Lead Time, Change Failure Rate, MTTR), SPACE Framework (Satisfaction, Performance, Activity,…
Idiomatic Dart patterns: Sound Null Safety (?, !, ??, ??=, ?.), Extension Methods, Mixins with constraints, Sealed Classes (Dart 3) with exhaustive pattern matching,…
Visual layout and composition principles: grid systems (column, baseline, modular), Gestalt principles (proximity, alignment, contrast, repetition, enclosure), whitespace as an…
Verification loop for FastAPI projects: type checking, linting, tests with coverage, security scans, and API schema validation before release or PR.
Local development environment patterns: runtime version pinning with mise/asdf, environment variables with direnv, Dev Containers for consistent team environments, Docker Compose…
Advanced Micro-Frontend patterns — testing strategy (unit per-remote, integration with mocked remotes, E2E full composition via Playwright), CI/CD independent deployments per…
Data Mesh architecture patterns — domain ownership, data products with SLOs, self-serve platform design, Delta Lake vs Iceberg, federated Trino queries, data contracts,…
Strategic Domain-Driven Design — Subdomain classification (Core/Supporting/Generic), Context Mapping (7 relationship patterns), Bounded Context design, and Event Storming.
UX micro-patterns for every product state: Empty States, Loading States (skeleton screens, spinners, optimistic UI), Error States, Success States, Confirmation Dialogs, Onboarding…
Advanced Swift patterns — property wrappers, result builders, Combine basics, opaque & existential types, macro system, advanced generics, and performance optimization.
Advanced Elixir/Phoenix patterns — distributed Erlang clusters, CRDT-based state, Ecto multi-tenancy, event sourcing, Commanded framework, and RFC 7807 API errors.
Visual Regression Testing: tool comparison (Chromatic/Percy/Playwright screenshots/BackstopJS), pixel-diff vs AI-based comparison, baseline management, flakiness strategies…
Advanced C++ standards — concurrency (CP.*), templates & C++20 concepts (T.*), standard library (SL.*), enumerations (Enum.*), source files & naming (SF.*/NL.*), performance…
Full lifecycle management for clarc instincts — capture, scoring, decay, conflict resolution, promotion, and removal
Advanced TypeScript — mapped types, template literal types, conditional types, infer, type guards, decorators, async patterns, testing with Vitest/Jest, and performance.
Brand identity development: color palette construction (primary/secondary/semantic/neutral), logo concept brief writing, typeface pairings, brand voice definition, mood board…
TypeScript monorepo patterns with Turborepo + pnpm workspaces. Covers package structure, shared configs, task pipeline caching, build orchestration, and publishing strategy.
Hexagonal architecture (ports & adapters) for TypeScript Node.js backends. Package structure, port definitions, use case implementation, adapter patterns, DI wiring, and testing…
Patterns for using clarc MCP server in multi-agent workflows, CI pipelines, and external tools
GraphQL API patterns: schema-first design, resolvers, DataLoader for N+1 prevention, subscriptions, error handling, pagination, auth, and performance.
DevSecOps patterns — shift-left security, SAST (semgrep/CodeQL), secrets detection (gitleaks/trufflehog), dependency scanning (trivy/grype), DAST, OPA/Falco policy-as-code,…
PHP 8.4+ patterns: readonly classes/properties, enums, named arguments, match expressions, value objects, repository pattern, service layer with command/handler, Laravel…
TDD anti-patterns — writing code before tests, testing implementation details instead of behavior, using waitForTimeout as a sync strategy, chaining tests that share state,…
Create zero-dependency, animation-rich HTML presentations from scratch or by converting PowerPoint/PPTX files.
C++ coding standards (C++ Core Guidelines). Core rules for philosophy, interfaces, functions, classes, resource management, error handling, and immutability.
Terraform in CI/CD — plan on PR, apply on merge, OIDC auth, drift detection, importing existing resources, common CLI commands, anti-patterns, and Terraform vs Pulumi vs CDK…
Domain-Driven Design tactical patterns for Python — entities, value objects, aggregates, repositories, domain events, and application services using dataclasses and Pydantic.
C programming patterns (C11/C17): opaque pointer encapsulation, error handling via return codes and out-parameters, resource cleanup with goto, memory management discipline…
Workflow Starter-Packs — 6 battle-tested project archetypes (REST API, React SPA, Python Pipeline, Go Service, Flutter App, Spring Boot).
Prepare a talk from scratch: audience analysis, time boxing per section, outline structure, speaker notes, rehearsal strategy, Q&A preparation, and nervous system management.
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