Software Development Skills

Validate code against accessibility standards: WCAG 2.1 Level AA, EN 301 549, and the European Accessibility Act (EAA / Directive EU 2019/882). Covers semantics, text alternatives, keyboard/focus, color/contrast, forms, media, ARIA, motion, mobile, and EAA documentation requirements. Framework-aware (React/Next/Nuxt/Astro/Gatsby/SvelteKit/Remix/Angular/Vue/React Native/Flutter/static HTML).

Mandatory engineering, security, testing, git, performance, quality, and response rules. Claude MUST load this skill for every technical, coding, debugging, review, architecture, DevOps, data, or file-editing task in Chat or Cowork.

Scans codebase for business opportunities by analyzing database schemas, API endpoints, tracking events, and feature flags to surface underutilized capabilities, missing KPIs, and monetization gaps. Use when the user asks about revenue opportunities, business metrics, KPI coverage, analytics gaps, or monetization analysis of a codebase.

Provides CI/CD pipeline best practices for GitHub Actions, deployment strategies, and pipeline optimization. Use when setting up pipelines, configuring GitHub Actions, managing deployments, or when user mentions 'CI', 'CD', 'pipeline', 'GitHub Actions', 'deploy', 'workflow', 'build'.

Loaded when user builds content moderation, safety filters, or policy enforcement with Claude. Covers pre-filter vs LLM-classify, category design, confidence thresholds, and human-in-the-loop.

C++ coding rules from ai-toolkit: coding-style, frameworks, patterns, security, testing. Triggers: .cpp, .cc, .cxx, .hpp, .h, CMakeLists.txt, Makefile, GoogleTest, clang-tidy. Load when writing, reviewing, or editing C++ code.

C/.NET coding rules from ai-toolkit: coding-style, frameworks, patterns, security, testing. Triggers: .cs, .csproj, .sln, ASP.NET, ASP.NET Core, EF Core, LINQ, NUnit, xUnit, dotnet. Load when writing, reviewing, or editing C/.NET code.

Dart/Flutter coding rules from ai-toolkit: coding-style, frameworks, patterns, security, testing. Triggers: .dart, pubspec.yaml, Flutter, Riverpod, Bloc, widget, StatelessWidget, StatefulWidget. Load when writing, reviewing, or editing Dart/Flutter code.

E-commerce domain patterns: cart, checkout flow, payment providers (Stripe/Adyen), order state machine, inventory, promotions, tax, B2B vs B2C. Triggers: cart, checkout, product, SKU, inventory, payment, Stripe, Shopify, Medusa, Magento, order status, promotion, tax calculation, coupon, refund. Load when working on any e-commerce feature.

Advanced Git workflows: interactive rebase, bisect, reflog, cherry-pick, worktrees, history rewriting, submodules, large-file migration (LFS/filter-repo). Triggers: git rebase, bisect, cherry-pick, reflog, force push, history rewrite, detached HEAD, merge conflict, worktree, squash, fixup, submodule. Load when user needs non-trivial Git operations.

Go coding rules from ai-toolkit: coding-style, frameworks, patterns, security, testing. Triggers: .go, go.mod, go.sum, Gin, Echo, Gorilla, testing, gofmt. Load when writing, reviewing, or editing Go code.

Validate code against HIPAA policy: PHI exposure, missing audit logging, unencrypted transmission/storage, access control gaps, temp file exposure, and missing BAA…

Review, promote, or remove learned instincts extracted from past sessions (.claude/instincts/.md). Use when the user wants to curate the instinct list — not to extract new instincts or edit memory.

Java development patterns: Spring Boot, CompletableFuture, records, sealed types, streams, JPA/Hibernate, Maven/Gradle, virtual threads (Loom). Triggers: Java, Spring, Spring Boot, JPA, Hibernate, Maven, Gradle, CompletableFuture, record type, sealed class, virtual thread. Load when writing or reviewing Java code.

Java coding rules from ai-toolkit: coding-style, frameworks, patterns, security, testing. Triggers: .java, pom.xml, build.gradle, Spring, Spring Boot, JPA, Hibernate, JUnit, Maven, Gradle. Load when writing, reviewing, or editing Java code.

Loaded when user needs structured JSON output from Claude. Covers tool-use-as-JSON-mode, schema design, parsing, partial recovery, and validation.

Kotlin coding rules from ai-toolkit: coding-style, frameworks, patterns, security, testing. Triggers: .kt, .kts, build.gradle.kts, Ktor, Jetpack Compose, coroutines, kotlinx. Load when writing, reviewing, or editing Kotlin code.

Medplum (FHIR healthcare) coding rules from ai-toolkit: coding-style, frameworks, patterns, security, testing. Triggers: medplum.config.mts, medplum.config.ts, FHIR, Medplum, Bot, Subscription, Questionnaire. Load when writing, reviewing, or editing Medplum (FHIR healthcare) code.

Run autonomous maintenance tasks (dependency updates, dead code removal, small refactors) in an isolated branch. Use only when the user triggers it explicitly — typically off-hours; never auto-invoked.

Observability: structured logging, metrics (RED/USE/four golden signals), distributed tracing (OpenTelemetry), correlation IDs, log aggregation, SLO/SLI. Triggers: logging, log level, metrics, Prometheus, Grafana, OpenTelemetry, trace, span, structured log, observability, monitoring, SLO, SLI, alerting. Load when adding or reviewing logs, metrics, or traces.

Emergency kill switch that halts all agent activity via a lockfile gate. Use when agents are looping, misbehaving, or the user wants to stop everything NOW — not for normal workflow interruptions.

Loaded when user builds with Anthropic API and needs to cut cost or latency via prompt caching. Covers TTL, cache breakpoints, stacking, invalidation, and measuring hit rate.

Python coding rules from ai-toolkit: coding-style, frameworks, patterns, security, testing. Triggers: .py, .pyi, pyproject.toml, requirements.txt, Pipfile, FastAPI, Django, Flask, pytest, SQLAlchemy, ruff, mypy. Load when writing, reviewing, or editing Python code.

Interactive QA session where user reports bugs conversationally and agent files GitHub issues with domain language. Explores codebase in background for context. Use when user wants to report bugs, do QA, file issues conversationally, or mentions QA session.