Yellow Network and Nitrolite (ERC-7824) development best practices for building state channel applications. Use when building apps with Yellow SDK, implementing state channels, connecting to ClearNodes, managing off-chain transactions, or working with application sessions.

Run the Vale prose linter on CircleCI documentation files to identify and fix style errors, then create pull requests for review. Use this skill when the user explicitly asks to "run vale", "fix vale errors", "lint docs with vale", or mentions vale linting. This skill processes documentation files, fixes error-level Vale issues, and creates individual PRs per file for easier review.

Build Text User Interface (TUI) applications using the Textual Python framework (v0.86.0+). Use when creating terminal-based applications, prototyping card games or interactive CLIs, or when the user mentions Textual, TUI, or terminal UI. Includes comprehensive reference documentation, card game starter template, and styling guides.

Common Clerk SDK patterns and best practices. Use when implementing authentication flows, accessing user data, or integrating Clerk SDK methods in your application. Trigger with phrases like "clerk SDK", "clerk patterns", "clerk best practices", "clerk API usage".

Apollo.io data management and compliance. Use when handling contact data, implementing GDPR compliance, or managing data exports and retention. Trigger with phrases like "apollo data", "apollo gdpr", "apollo compliance", "apollo data export", "apollo data retention", "apollo pii".

Manage Firebase/Firestore operations including CRUD, queries, batch processing, and index/rule guidance. Use when you need to create/update/query Firestore documents, run batch writes, troubleshoot missing indexes, or plan migrations. Trigger with phrases like "firestore operations", "create firestore document", "batch write", "missing index", or "fix firestore query".

Browser automation and E2E testing with Playwright. Auto-detects dev servers, writes clean test scripts. Test pages, fill forms, take screenshots, check responsive design, validate UX, test login flows, check links, automate any browser task. Use for cross-browser testing, visual regression, API testing, component testing in TypeScript/JavaScript and Python projects.

Google Gemini File Search for managed RAG with 100+ file formats. Use for document Q&A, knowledge bases, or encountering immutability errors, quota issues, polling failures. Supports Gemini 3 Pro/Flash (Gemini 2.5 legacy).

AWS EventBridge serverless event bus for event-driven architectures. Use when creating rules, configuring event patterns, setting up scheduled events, integrating with SaaS, or building cross-account event routing.

Creates an isolated git worktree workspace with smart directory selection, gitignore safety verification, dependency installation, and baseline test validation. Use when starting feature work, beginning a new branch, needing workspace isolation, setting up before plan execution, or the user says "new feature", "set up a worktree", or "isolate this work". DO NOT TRIGGER for worktree cleanup or removal — use kit:worktree-cleanup instead.

Design and build native-feeling macOS application UIs. Use this skill whenever the user asks to create a desktop app, macOS app, Mac-style interface, Apple-style UI, system utility, or anything that should look and feel like a native Mac application. Also trigger when users mention "native feel", "desktop app design", "Apple design patterns", "sidebar layout", "traffic lights", or want to build tools/utilities that feel like they belong on macOS. This skill covers layout, composition, interaction patterns, animations, light/dark mode, and all the subtle details that make an app feel like Apple built it.

Configure Langfuse enterprise organization management and access control. Use when implementing team access controls, configuring organization settings, or setting up role-based permissions for Langfuse projects. Trigger with phrases like "langfuse RBAC", "langfuse teams", "langfuse organization", "langfuse access control", "langfuse permissions".

Implement Juicebox rate limiting. Trigger: "juicebox rate limit", "juicebox 429", "juicebox throttle".

Set up Juicebox monitoring. Trigger: "juicebox monitoring", "juicebox metrics".

Optimize Gamma usage costs and manage API spending. Use when reducing API costs, implementing usage quotas, or planning for scale with budget constraints. Trigger with phrases like "gamma cost", "gamma billing", "gamma budget", "gamma expensive", "gamma pricing".

Implement content policy enforcement, domain filtering, and usage guardrails for Exa. Use when setting up content safety rules, restricting search domains, or enforcing query and budget policies for Exa integrations. Trigger with phrases like "exa policy", "exa content filter", "exa guardrails", "exa domain allowlist", "exa content moderation".

Implement Deepgram rate limiting and backoff strategies. Use when handling API quotas, implementing request throttling, or dealing with 429 rate limit errors. Trigger: "deepgram rate limit", "deepgram throttling", "429 error deepgram", "deepgram quota", "deepgram backoff", "deepgram concurrency".

Fetches web content with intelligent content extraction, converting HTML to clean markdown. Use for documentation, articles, and reference pages http/https URLs.

Repository-specific Cerebro review invariants and triage guidance for Droid code and security reviews.