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Found 129 Skills
Autonomous mobile dev subagent that implements a single user story from a PRD for Expo / React Native apps. Use when you need parallel, independent mobile implementation tasks — screens, native components, data fetching, navigation. Designed to run alongside other ralph-mobile instances. Receives a specific task ID and PRD path. Returns a structured completion signal. Does NOT commit or modify the PRD — those are handled by the documenter. Loads expo, building-native-ui, vercel-react-native-skills, native-data-fetching, and expo-dev-client skills automatically.
Apply bulletproof-react conventions when writing, organizing, or reviewing React or TypeScript apps. Covers feature-based folder structure, API layers, state management categories, testing strategy, error handling, auth, and performance. Use whenever the user creates a new React feature, sets up project structure, asks "where does this go" or "how should I organize this", decides where state lives, writes data-fetching or auth code, or asks for a React architecture review. Triggers on "feature folder", "React project structure", "should I use Redux", "how to structure API calls".
React useEffect best practices from official docs. Use when writing/reviewing useEffect, useState for derived values, data fetching, or state synchronization. Teaches when NOT to use Effect and better alternatives.
Manage server state in React with TanStack Query v5. Covers useMutationState, simplified optimistic updates, throwOnError, network mode (offline/PWA), and infiniteQueryOptions. Use when setting up data fetching, fixing v4→v5 migration errors (object syntax, gcTime, isPending, keepPreviousData), or debugging SSR/hydration issues with streaming server components.
An Instagram API alternative on fetcher.sh — pay-per-call in USDC via x402, or prepaid credits with a Bearer key, no login and no session cookies. Use when the user wants to resolve an Instagram profile by @handle, search users by keyword, pull a profile's posts, reels, stories, tagged posts, followers, or followings, look up a single post by its shortcode, read a post's comments, fetch posts under a hashtag or reel-only hashtag feed, pull posts from a location, or pull posts using a specific audio/music track. Also covers Instagram follower export, hashtag and location monitoring, influencer discovery, competitor content tracking, and Instagram data pipelines without an official Graph API business verification or a headless browser.
A TikTok API alternative on fetcher.sh — pay-per-call in USDC via x402, or prepaid credits with a Bearer key, no login and no app review. Use when the user wants to search TikTok posts by keyword and sort by most-liked or most recent within a date range, look up a post by its share URL or ID, scrape a TikTok profile by @username, pull a user's posts, followers, or followings, fetch a hashtag's posts, pull posts using a specific sound/music track, get posts from a location, or read a post's comments and comment replies. Also covers TikTok trend tracking, hashtag monitoring, influencer discovery, competitor content analysis, and TikTok data pipelines without official TikTok API access or a scraping browser.
A Twitter API alternative and X API alternative on fetcher.sh — pay-per-call in USDC via x402, or prepaid credits with a Bearer key, no OAuth and no developer application. Use when the user wants to search tweets by keyword, hashtag, or advanced operators (from:, to:, since:, until:, min_faves:, filter:), scrape a Twitter/X profile by handle, pull a user's tweets, replies, followers, or followings, fetch a single tweet with its replies or retweeters, read a Twitter List's members or tweets, check trending topics by country, or search for X accounts by name. Also covers Twitter data pipelines, competitor monitoring, hashtag tracking, sentiment analysis input, or follower export without the official X API's pricing tiers or app-review process.
Master Next.js 14+ App Router with Server Components, streaming, parallel routes, and advanced data fetching. Use when building Next.js applications, implementing SSR/SSG, or optimizing React Server Components.
API no oficial de Yahoo Finance: precios, históricos, fundamentales, opciones, noticias en JSON puro sin wrappers.
Use the polymarket_book tool to fetch Polymarket CLOB order book depth (YES/NO) via Gamma + CLOB and expose best bid/ask/mid.
Fetch upcoming economic events and data releases using FMP API. Retrieve scheduled central bank decisions, employment reports, inflation data, GDP releases, and other market-moving economic indicators for specified date ranges (default: next 7 days). The script outputs raw JSON or text; the assistant filters, assesses impact, and generates the Markdown report.
Fetch hot finance news, unified trends, and prediction financial market data. Use when the user needs real-time financial news, trend reports from multiple finance sources (Weibo, Zhihu, WallstreetCN, etc.), or Polymarket finance market prediction data.