Claude Skills by TerminalSkills

Find edge-case bugs with property-based testing using fast-check — generate thousands of random inputs automatically. Use when someone asks to "find edge cases", "fast-check", "property-based testing", "fuzz testing in TypeScript", "generate random test data", "QuickCheck for JavaScript", or "test with random inputs". Covers property definitions, arbitraries, shrinking, model-based testing, and integration with Vitest/Jest.

FastAPI is a modern, high-performance Python web framework for building APIs. It leverages Python type hints and Pydantic for automatic validation, serialization, and OpenAPI documentation generation with async/await support out of the box.

Fastify is a high-performance Node.js web framework focused on developer experience and low overhead. It features JSON Schema validation, a powerful plugin system, lifecycle hooks, and automatic serialization for blazing-fast APIs.

Automate mobile app builds, signing, and deployment with Fastlane — CI/CD for iOS and Android. Use when someone asks to "automate App Store deployment", "Fastlane", "automate iOS build", "CI/CD for mobile", "automate Play Store upload", "code signing automation", or "mobile release pipeline". Covers build automation, code signing, TestFlight, Play Store, screenshots, and CI.

When the user needs to implement feature flags, gradual rollouts, or experiment bucketing. Use when the user mentions "feature flag," "feature toggle," "gradual rollout," "canary release," "percentage rollout," "kill switch," "user bucketing," "experiment assignment," or "dark launch." Covers flag evaluation, deterministic user assignment, targeting rules, and flag lifecycle management. For experiment design, see ab-test-setup. For event tracking, see analytics-tracking.

Collect, categorize, and synthesize user feedback from multiple channels into actionable product insights. Use when tasks involve analyzing support tickets, app store reviews, NPS survey responses, social media mentions, user interviews, feature request prioritization, sentiment analysis, churn prediction from feedback patterns, or building voice-of-customer reports. Covers multi-channel feedback aggregation and data-driven product decisions.

Use fff (Fast File Finder) — a blazing-fast file search tool built in Rust with Node.js bindings, optimized for AI agents and Neovim integration. Supports fuzzy matching, regex, gitignore-aware filtering, and sub-millisecond search across large codebases. Use when tasks involve fast file discovery, AI agent tooling, or Neovim file navigation.

Transcode, convert, edit, and process audio and video with FFmpeg. Use when a user asks to convert video formats (webm to mp4, mkv to mp4), extract audio from video, compress video files, trim or cut clips, concatenate videos, add subtitles, create thumbnails, apply filters, change resolution or bitrate, re-encode media, create GIFs from video, add watermarks, normalize audio, stream media, or build automated media processing pipelines.

Discover hidden content, directories, subdomains, and API endpoints with ffuf — the fastest web fuzzer. Use when someone asks to "find hidden directories", "fuzz URLs", "discover API endpoints", "subdomain enumeration", "content discovery", "ffuf", "brute force paths", or "find hidden files on a website". Covers directory fuzzing, parameter fuzzing, subdomain discovery, virtual host enumeration, and recursive scanning.

Expert guidance for Amazon Q Developer (formerly Fig), the terminal tool that provides IDE-style autocomplete, AI chat, and CLI builder capabilities. Helps developers create custom completion specs, build CLI tools with autocomplete, and configure terminal productivity features.

Interact with the Figma REST API to read design files, export assets, extract components, and pull design tokens programmatically. Use when tasks involve automating design handoff, syncing design tokens to code, exporting icons/images from Figma, or building integrations between Figma and development pipelines.

Convert Figma designs into production-ready frontend code. Use when someone shares a Figma URL, design screenshot, or exported design tokens and needs React/Vue/HTML components, responsive layouts, or design system code. Trigger words: Figma, design to code, mockup, wireframe, UI implementation, pixel perfect, design handoff, component from design.

Organize and rename files based on content analysis. Use when a user asks to sort files into folders, rename files by pattern, organize a messy directory, categorize documents by type or content, deduplicate files, or clean up a downloads folder. Handles smart renaming, content-based sorting, and duplicate detection.

When the user needs to build file upload functionality for a web application. Use when the user mentions "file upload," "image upload," "upload endpoint," "multipart upload," "presigned URL," "S3 upload," "file validation," "upload to cloud storage," or "accept user files." Handles upload endpoints, file validation (type, size, magic bytes), cloud storage integration, and upload status tracking. For image/video processing after upload, see media-transcoder.

Find and build a community around your product — identify where your users gather, engage authentically, and grow a loyal user base. Use when: building community-led growth, finding early adopters, creating a brand community.

Expert guidance for Firebase, Google's platform for building and scaling web and mobile applications. Helps developers set up authentication, Firestore/Realtime Database, Cloud Functions, hosting, storage, and analytics using Firebase's SDK and CLI.

Convert any website into clean, structured data with Firecrawl — API-first web scraping service. Use when someone asks to "turn a website into markdown", "scrape website for LLM", "Firecrawl", "extract website content as clean text", "crawl and convert to structured data", or "scrape website for RAG". Covers single-page scraping, full-site crawling, structured extraction, and LLM-ready output.

Expert guidance for Fireworks AI, the platform for running open-source LLMs (Llama, Mixtral, Qwen, etc.) with enterprise-grade speed and reliability. Helps developers integrate Fireworks' inference API, fine-tune models, and deploy custom model endpoints with function calling and structured output support.

Find and convert your first 10-100 customers using founder-led sales, community engagement, and early adopter strategies. Use when: launching a new product, acquiring first users, building initial traction before scaling.

Flask is a lightweight Python micro web framework that provides the essentials for web development without imposing structure. It uses Jinja2 templates and Werkzeug WSGI toolkit, with a rich ecosystem of extensions for databases, auth, and more.

Process real-time data streams with Apache Flink. Use when a user asks to build real-time analytics, process event streams with low latency, implement complex event processing, or run stateful stream processing at scale.

Configure Fluentd for unified log collection, routing, filtering, and forwarding across distributed systems. Use when a user needs to aggregate logs from multiple sources, transform log data with filters, route logs to different destinations, or set up Fluentd as a Kubernetes log collector.

Expert guidance for Flutter, Google's UI toolkit for building natively compiled applications for mobile, web, and desktop from a single Dart codebase. Helps developers build performant cross-platform apps with custom widgets, state management, platform channels, and production deployment.

FLUX image generation models — Flux Pro, Dev, and Schnell via fal.ai, Replicate, or Black Forest Labs API. Use when generating high-quality or photorealistic images, applying LoRA fine-tuning for custom styles, or building production image generation pipelines.

Assists with deploying applications globally on Fly.io edge infrastructure. Use when deploying Docker-based apps, configuring multi-region machines, setting up persistent storage, or managing global databases. Trigger words: fly.io, fly deploy, fly machines, fly launch, multi-region, edge deployment, flyctl.

Recover deleted files and carve artifacts from disk images and memory dumps with Foremost. Use when a user asks to extract files from a raw disk image, recover accidentally deleted photos, pull embedded files out of a CTF blob, or carve artifacts from unallocated space.

When the user wants to optimize any form that is NOT signup/registration — including lead capture forms, contact forms, demo request forms, application forms, survey forms, or checkout forms. Also use when the user mentions "form optimization," "lead form conversions," "form friction," "form fields," "form completion rate," or "contact form." For signup/registration forms, see signup-flow-cro. For popups containing forms, see popup-cro.

Collect user feedback and run in-app surveys with Formbricks — open-source experience management platform. Use when someone asks to "add surveys to my app", "Formbricks", "in-app feedback", "NPS survey", "user research", "product feedback tool", or "open-source Typeform alternative". Covers in-app surveys, website popups, link surveys, targeting, and analytics.

Build forms in React with Formik. Use when creating complex forms with validation, multi-step forms, dynamic form fields, or handling form submission with error states.

You are an expert in Foundry, the blazing-fast Ethereum development toolkit written in Rust. You help developers write, test, deploy, and debug Solidity smart contracts using Forge (testing), Cast (CLI interactions), Anvil (local node), and Chisel (Solidity REPL) — with native Solidity testing (no JavaScript), fuzz testing, gas optimization, and fork testing against mainnet state.

When the user wants to plan, evaluate, or build a free tool for marketing purposes — lead generation, SEO value, or brand awareness. Also use when the user mentions "engineering as marketing," "free tool," "marketing tool," "calculator," "generator," "interactive tool," "lead gen tool," "build a tool for leads," or "free resource." This skill bridges engineering and marketing — useful for founders and technical marketers.

Expert frontend design guidelines for creating beautiful, modern UIs. Use when a user asks to design a landing page, create a dashboard layout, build a modern UI, style a web application, design a hero section, create a responsive layout, implement frontend design patterns, or improve AI-generated UI quality with design-system-level controls.

Implement function/tool calling with LLMs — define tools, handle calls, and return results in a loop. Use when building AI agents with tools, letting LLMs interact with APIs or databases, creating agentic workflows, or enabling models to take real-world actions.

Download images and media galleries from websites with gallery-dl. Use when a user asks to download images from Instagram, Twitter/X, Reddit, Pixiv, DeviantArt, Danbooru, Tumblr, Flickr, ArtStation, or other image hosting sites, bulk download image galleries, archive artist portfolios, scrape images with metadata, download from image boards, save entire user profiles or tagged collections, or build image dataset pipelines.

Expert guidance for Gatus, the lightweight, self-hosted health check and status page tool written in Go. Helps developers set up endpoint monitoring with conditions, alerting, and a beautiful status page — all configured via a single YAML file with no database required.

Google Cloud CLI for managing GCP resources. Use when the user needs to work with Compute Engine, Cloud Storage, Cloud Functions, IAM, GKE, and other Google Cloud services from the terminal.

Provision and manage AlloyDB for PostgreSQL clusters and instances on Google Cloud — a managed, PostgreSQL-compatible database with disaggregated compute/storage, columnar engine, and AlloyDB AI for vector search and natural-language queries. Use for HA clusters, read pools, IAM database auth, and Terraform-managed AlloyDB deployments.

Configure authentication and authorization for Google Cloud — Application Default Credentials (ADC), service account impersonation, Workload Identity Federation for GKE and external clouds, and OIDC ID tokens for service-to- service auth. Use when setting up local dev access, deploying to Cloud Run / Cloud Functions / GKE, or calling private Google Cloud APIs.

Analyze massive datasets with Google BigQuery. Run SQL queries on petabytes of data, load and stream data in real-time, create materialized views, and use BigQuery ML for machine learning models directly in SQL.

Build serverless functions on Google Cloud Functions. Deploy HTTP and event-driven functions triggered by Pub/Sub, Cloud Storage, and Firestore. Configure runtime settings, manage dependencies, and connect to other GCP services.

Deploy serverless containers on Google Cloud Run — services for HTTP traffic, jobs for batch and scheduled tasks, and worker pools for always-on pull-based background processing. Build and push container images, configure auto-scaling from zero, split traffic for canary deploys, and set up custom domains with managed TLS.

Provision and manage Cloud SQL instances on Google Cloud for MySQL, PostgreSQL, and SQL Server. Configure high availability, read replicas, automated backups, IAM database authentication, the Cloud SQL Auth Proxy, and Terraform deployments. Use for managed relational databases on GCP.

Manage Google Cloud Storage for scalable object storage. Create and configure buckets, upload and organize objects, generate signed URLs for secure temporary access, set lifecycle rules for cost optimization, and configure access control.

Build real-time applications with Google Cloud Firestore. Model data with collections and documents, execute queries with composite indexes, set up real-time listeners for live updates, enable offline persistence, and write security rules for client-side access control.

Provision and operate production-ready Google Kubernetes Engine (GKE) clusters using Autopilot as the golden path. Covers Autopilot vs Standard, private clusters, Workload Identity, autoscaling, GPU/TPU node pools for AI inference, cost optimization with Spot VMs, and observability via Managed Prometheus.

Investigate Google Cloud networking issues by analyzing VPC Flow Logs, firewall logs, Cloud NAT logs, threat logs, and networking metrics. Run Connectivity Tests for path diagnostics and use BigQuery linked datasets for high-volume traffic analysis. Use when troubleshooting connection failures, latency, packet loss, or top-talkers.

Apply the Google Cloud Well-Architected Framework's Cost Optimization pillar to evaluate workloads and recommend FinOps practices — billing exports, budgets, rightsizing via Active Assist, Spot VMs, Committed Use Discounts, storage lifecycle policies, and serverless adoption. Use for cloud cost reviews, monthly billing analysis, and architecture cost decisions.

Apply the Google Cloud Well-Architected Framework's Reliability pillar — define user-centric SLOs, eliminate single points of failure with multi-zone/region redundancy, configure horizontal autoscaling, observability via Cloud Monitoring, graceful degradation patterns, DR testing, and blameless postmortems. Use for production readiness reviews and SRE practices.

Apply the Google Cloud Well-Architected Framework's Security pillar — security by design, zero trust with IAP and BeyondCorp, shift-left scanning in CI/CD, Binary Authorization, VPC Service Controls, Cloud Armor, Sensitive Data Protection, and Security Command Center. Use for security architecture reviews, hardening checklists, and compliance evaluations.

Automate GDPR and privacy compliance for web applications. Use when someone asks to "make the app GDPR compliant", "add cookie consent", "handle data deletion requests", "audit PII", "data subject access request", or "privacy policy generator". Covers PII auditing, consent management, data subject request endpoints, retention policies, and privacy policy generation.