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Writing developer-facing prose that can be skimmed first and trusted enough to finish — READMEs, guides, tutorials, reference docs, proposals, PR descriptions, release notes. Load before drafting, rewriting, restructuring, or editing technical documents, when…
Quellsprache: Englisch
Compose installed agent skills into one orchestrated multi-agent run: an agent graph where each node is a sub-agent that loads exactly one skill, edges carry structured data, and stages fan work out, adversarially verify it, and synthesize one deliverable.…
Quellsprache: Englisch
Composable multi-agent code review of any change boundary — the working tree mid-development, a branch diff, a stacked layer, or a pull request: one orchestrator fans out sub-agents, each loading exactly one installed skill as a review lens…
Quellsprache: Englisch
Design and protect browser-facing BFF and backend HTTP entry points: an explicit public/protected access classification for every production route, a composition-prepared endpoint registrar that installs session, Origin, Fetch Metadata, CSRF, and content-type…
Quellsprache: Englisch
Design and evaluate deep modules: cohesive responsibility behind a small, stable caller-facing contract, with information hiding, justified seams, explicit effects, dependency strategy, and behavior-focused tests. Use when designing or changing an in-process…
Quellsprache: Englisch
Functional programming patterns with immutable data. Use when writing logic, data transformations, or encountering mutation bugs — including any feature request that builds, merges, filters, sorts, prices or otherwise reshapes records, lists, carts, orders or…
Quellsprache: Englisch
Observability as an engineering discipline — wide events / canonical log lines, OpenTelemetry instrumentation (traces, metrics, context propagation, sampling, Collector), SLIs/SLOs/error budgets, symptom-based alerting with burn rates, telemetry hygiene, and…
Quellsprache: Englisch
Reduce total mechanism in a selected existing system or behavior path while conserving its agreed observable behavior and non-functional guarantees. Use when the user explicitly wants fewer branches, states, dependencies, layers, flags, retries, jobs,…
Quellsprache: Englisch
Refactoring assessment and behavior-preserving patterns for code with a passing baseline and proportionate preservation evidence. Use when the user asks to clean up, tidy, simplify, restructure, deduplicate, collapse, or merge look-alike code in a selected…
Quellsprache: Englisch
Design, audit, and evolve physical source and package structures that expose real architectural boundaries while keeping related behavior together. Use when creating or reviewing repository trees, deciding where files or packages belong, reducing flat…
Quellsprache: Englisch
Stable consumer-facing API and interface design patterns. Use when designing REST endpoints, cross-team boundaries, or any externally consumed or versioned service contract. Covers contract-first development, error semantics (RFC 9457), REST conventions,…
Quellsprache: Englisch
Unix-composable CLI design patterns. Use when building CLI tools, designing command trees, implementing output layers, or testing CLI behavior. Covers stream separation (stdout/stderr), format flags (--json/--plain), exit codes, TTY detection, composability,…
Quellsprache: Englisch
Design, implement, audit, test, troubleshoot, or migrate secure OAuth 2.0 and OpenID Connect (OIDC) systems using RFC 9700 / BCP 240. Use for authorization servers and OpenID Providers, OAuth clients and OIDC relying parties, resource servers, native apps,…
Quellsprache: Englisch
Twelve-Factor App patterns for software-as-a-service and long-running process applications. Use when configuring deploy-time environment, backing services, process startup/shutdown, or operational parity. Apply individual principles to frontends, serverless…
Quellsprache: Englisch
Discover and, with authorization, install agent skills from the open skills ecosystem. Use when the user explicitly asks to find or install a skill from the external skills ecosystem, asks whether an installable agent skill exists for a task, or wants to…
Quellsprache: Englisch
Draft release notes from Git history.
Quellsprache: Englisch
Patterns for prerelease Effect applications.
Quellsprache: Englisch
Behavior-driven UI testing patterns across Vitest Browser Mode, Playwright E2E evidence boundaries, and DOM Testing Library. Use when testing any front-end application, writing UI or end-to-end tests, querying DOM elements, simulating user interactions, or…
Quellsprache: Englisch
Make React and Next.js performance changes that are measured, evidence-backed, and behaviorally safe. Routes to the right rule catalogue — vercel-react-best-practices for the 72 prioritized React/Next rules, vercel-composition-patterns for component API…
Quellsprache: Englisch
React component testing patterns including components, hooks, context, and forms. Covers Vitest Browser Mode with vitest-browser-react and @testing-library/react. Use when testing React applications. For general UI testing patterns, see the front-end-testing…
Quellsprache: Englisch
RED-GREEN-REFACTOR for production behavior changes, followed by mutation testing or alternate evidence once at the end-of-phase PR-readiness gate. Use before implementing new features, bug fixes, or any changed observable behavior, and as the governing…
Quellsprache: Englisch
Model front-end and workflow logic as XState v5 statecharts and actors — when finite states earn their place (and when @xstate/store or a discriminated union is honest), event-first machine design, guards/actions/delays, invoke vs spawn, app-level actor…
Quellsprache: Englisch
Use when modifying existing code that lacks tests and you need to document its actual current behavior before making changes -- the legacy code dilemma where you need tests to refactor safely but the code was not written for testability. Specifically for…
Quellsprache: Englisch
Use when existing code has untestable dependencies that prevent writing tests -- direct construction of collaborators, static or global function calls, tight coupling to external systems, or singleton access patterns. Specifically for identifying substitution…
Quellsprache: Englisch
Set up and run mutation testing with Stryker, including full-project and focused diff runs against the current review base, then use surviving mutants to strengthen weak or missing tests. Use as the end-of-phase PR-readiness gate after implementation and…
Quellsprache: Englisch
Testing patterns for behavior-driven tests. Use when writing tests, creating test factories, structuring test files, or deciding what to test. Do NOT use for UI-specific testing (see front-end-testing or react-testing skills).
Quellsprache: Englisch
TypeScript strict mode patterns including schema-first development, branded types, type vs interface guidance, and tsconfig strict flags. Use when writing TypeScript code, defining types or schemas, or reviewing type safety. For immutability and pure function…
Quellsprache: Englisch
Domain-Driven Design patterns for TypeScript. Use when implementing ubiquitous language, value objects, entities, aggregates, domain events, domain services, or bounded contexts. Only applies to projects that explicitly use DDD. Do NOT use for simple CRUD or…
Quellsprache: Englisch
Decide where a learning, gotcha, or decision should live so it is not lost, and capture it there while context is fresh. Use when the user says they just discovered, learned, or found out something non-obvious, asks where a fact should be recorded, written…
Quellsprache: Englisch
Use when the user or project explicitly adopts hexagonal (ports and adapters) architecture — a README, CLAUDE.md, or ADR that says so is the opt-in. Once a project has opted in, load this for every code change in it, not only architecture work — a new…
Quellsprache: Englisch
Render the shape of code — module boundaries, the types that cross them, signatures, and a cited call graph — for code that already exists or a change about to be built. Every name, type, and path is read from source and cited, or marked NEW; bodies collapse…
Quellsprache: Englisch
Get a rigorous read-only second opinion on finished work through the host's available reviewer capabilities, preferably from a different model provider. Falls back to a fresh same-provider agent only when necessary and labels the reduced independence. Every…
Quellsprache: Englisch
Planning work as vertical slices or an explicitly selected mechanism-reduction program in small, known-good increments, with independent pull requests or an optional stacked-PR topology across one or more ordered slices. Use when starting significant work,…
Quellsprache: Englisch
WHEN deciding whether a PR, branch, diff, or current implementation satisfies an authoritative issue, specification, or decision contract; NOT for improving the written artifact, reconstructing meetings, general code review, or implementing fixes. Returns a…
Quellsprache: Englisch
Systematic CI/CD failure diagnosis using hypothesis-first investigation, local reproduction, and environment delta analysis. Use when a CI pipeline, GitHub Actions workflow, or build job fails; when tests pass locally but fail in CI; when diagnosing flaky…
Quellsprache: Englisch
WHEN diagnosing a reproducible or observable software failure outside a CI-pipeline-specific workflow; NOT for speculative cleanup, general code review, or speculative behavior changes presented as fixes. Preserves evidence, tests one causal hypothesis at a…
Quellsprache: Englisch
Create or audit maintainable diagrams when relationships, sequence, state, hierarchy, or quantitative comparisons are materially clearer visually than in prose. Selects a format the destination actually renders, preserves source authority, validates output,…
Quellsprache: Englisch
Research and compare established libraries, open-source tools and applications, managed services, and standard, framework, or platform primitives against an explicit bespoke baseline before committing to a material generic mechanism. Use for library/tool…
Quellsprache: Englisch
Event sourcing patterns for functional TypeScript — persist state as an append-only log of past events and rebuild it by folding them. Use when implementing a Decider write model, an event store, projections and read models, event versioning, or snapshots.…
Quellsprache: Englisch
Adversarially review an existing written artifact — stories, plans, acceptance criteria, specs, or design mocks — to surface missing states, unhandled edge cases, unstated assumptions, unverifiable criteria, and slices still too broad or horizontal. Works…
Quellsprache: Englisch
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