Skills
98,639 packaged capabilities and playbooks for agents. Install any of them with one command.
Development
Implement pull-to-refresh with Riverpod using RefreshIndicator and ref.refresh; show spinner on initial load, show previous data during refresh, AsyncValue pattern matching. Use when the user asks about pull-to-refresh, RefreshIndicator with Riverpod, or refreshing async providers.
Scope Riverpod providers to a subtree using overrides and dependencies; page-specific behavior, ListView optimization, avoiding passing family parameters. Use when changing provider behavior for one page or widget, or when optimizing rebuilds. Use this skill when the user asks about scoping providers or provider scope.
Hedera Schedule Service (HSS) smart contract development. Use when creating or interacting with scheduled transactions from Solidity via the Schedule Service system contract at 0x16b (e.g. scheduleNative for token creation, scheduleCall for generalized contract calls, authorizeSchedule, signSchedule, deleteSchedule, or querying scheduled token info).
Image optimization analysis for SEO and performance. Checks alt text, file sizes, formats, responsive images, lazy loading, and CLS prevention. Use when user says "image optimization", "alt text", "image SEO", "image size", or "image audit".
When structuring code into layers and modules with clear boundaries. Use when the user says "this function does too much," "fat controller," "mixed concerns," "where should this logic go," or "separate the layers." For interface-level design, see solid. For object-level coupling, see law-of-demeter.
Set up and manage the Sentry development environment using devenv. Handles fresh setup, updating existing environments, starting dev services, resetting the database, per-worktree environment setup (each worktree needs its own devenv sync/.venv), and troubleshooting. Use when asked to "set up sentry", "setup dev environment", "get sentry running", "start dev server", "devenv setup", "devservices not working", "sentry won't start", "reset the database", "new worktree venv/devenv setup", or any development environment issue.
Expert guidance for shadcn-svelte, a Svelte 5 port of shadcn/ui. Use this skill when working with shadcn-svelte components, installing UI components via CLI, implementing forms with Superforms/Formsnap, adding dark mode with mode-watcher, creating data tables with TanStack Table, theming with Tailwind CSS v4 and OKLCH colors, or building custom component registries. Triggers on mentions of shadcn-svelte, Bits UI components, or SvelteKit UI component libraries.
Shopify development skills: Admin GraphQL, Storefront, Hydrogen, Liquid, Polaris, Functions, POS, and more. Use when building, querying, or validating code for Shopify's development ecosystem (e.g. Admin API queries, Hydrogen components, Liquid themes, checkout extensions). Skills are installable via the `npx skill` CLI and provide Claude Code with API-specific context, documentation search, and code validation for each Shopify surface.
Master SQL query optimization, indexing strategies, and EXPLAIN analysis to dramatically improve database performance and eliminate slow queries. Use when debugging slow queries, designing database schemas, or optimizing application performance.
Generate the v2 -> v3 sync mapping for a Stream Activity Feeds app by sampling its live v2 activities and reactions and, when the app's v2 integration code is available, reading its write paths; use that code to plan how the app moves from v2 to v3. Use when setting up a Feeds v2 to v3 migration, building, reviewing, or debugging a v3 sync mapping, asking "what mapping do we need for our app?", asking how to port an app's v2 Feeds code to v3, or when a migrated activity in v3 has missing text or attachments, comments that are not comments, or missing bookmarks. Triggers on v3sync, v2 to v3, feeds migration, activity feeds migration, sync mapping, extra_context, reaction kinds, comments and bookmarks mapping, porting plan. The same mapping drives both the live syncer and the bulk exporter
Build private dapps on Starknet through the Starknet Wallet API. Covers shield/unshield, private transfers, shielded balances, private DeFi calls, shadow-account actions, and AVNU private swaps from TypeScript or React. Use whenever an app asks the user's privacy-enabled wallet to perform STRK20 actions (starknet.js WalletAccountV6, useStrk20 hooks, strk20InvokeTransaction, STRK20_ACTION, open notes, openNoteIds placeholders). For the Cairo helper side use strk20-anonymizer-contracts, for wallets or backends holding their own keys use strk20-privacy-sdk, for concepts and route choice use strk20-privacy.
Sequential subagent execution with two-stage review gates for implementation plans. Use when executing multi-task plans in current session, when tasks need fresh subagent context to avoid pollution, when formal review cycles (spec compliance then code quality) are required between tasks, or when you need diff-based validation of each task before proceeding.
Review or implement interface accessibility for semantics, keyboard operation, focus, contrast, status communication, zoom, and assistive technology. Use when accessibility is explicitly requested, required by the product contract, or a changed interaction creates substantial accessibility risk. Do not activate for every visual edit or use it as a generic design audit.
Spec-first, TDD, subagent-driven software development workflow. Use when: (1) building any new feature or app — triggers brainstorm → plan → subagent execution loop, (2) debugging a bug or test failure — triggers systematic root-cause process, (3) user says "let's build", "help me plan", "I want to add X", or "this is broken", (4) completing a feature branch — triggers test verification + merge/PR options. NOT for: one-liner fixes (just edit), reading code, or non-code tasks. Requires exec tool and sessions_spawn.
Expert guidance on Swift library and framework design. Use when developers mention: (1) designing a Swift library or framework, (2) public API design patterns, (3) protocol-oriented architecture or associated types, (4) result builders or DSL design, (5) performance optimization for libraries, (6) @inlinable or @usableFromInline, (7) noncopyable types for APIs, (8) progressive disclosure in API design, (9) ResponseGenerator or builder patterns.
Implements Syncfusion Vue Grid component for feature-rich data tables and grids. Use this when working with data display, sorting, filtering, grouping, aggregates, editing, or exporting. This skill covers grid configuration, CRUD operations, virtual scrolling or infinite scrolling, hierarchy grids, state persistence, and advanced data management features for data-intensive applications.
Implement event scheduling, calendar views, and appointment management using Syncfusion Vue Scheduler component. Use this skill when working with calendars, event scheduling, appointment booking systems, resource management, timeline views, recurring events, drag-and-drop event handling, or any scenario involving time-based event visualization and management in Vue applications. Trigger for scheduler implementations, calendar integrations, booking systems, meeting planners, task schedulers, or resource allocation tools.
Provides comprehensive Tailwind CSS utility-first styling patterns including responsive design, layout utilities, flexbox, grid, spacing, typography, colors, and modern CSS best practices. Use when styling React/Vue/Svelte components, building responsive layouts, implementing design systems, or optimizing CSS workflow.
Typed chart grammar guidance for marks, scales, layouts, interaction, accessibility, rendering, and framework adapters. Use when a project uses TanStack Charts or when the task needs its setup, implementation, debugging, testing, migration, or integration guidance.
Type-safe form guidance for fields, validation, composition, submission, SSR, devtools, and framework adapters. Use when a project uses TanStack Form or when the task needs its setup, implementation, debugging, testing, migration, or integration guidance.
Tencent Maps JavaScript GL (JSAPIGL) development guide. Applies to writing map applications or tools. Use this skill when writing, reviewing or debugging code that uses the Tencent Maps API. Applies to tasks involving map initialization, overlay display, layer control, event handling, control interaction, visual rendering, map tools, search, route planning, address lookup, administrative divisions, IP location, geometry calculation, 3D model display and performance optimization. Triggers automatically when the user mentions 腾讯地图, jsapi, jsapi-gl or related map development needs.
Use when TYPO3 extension documentation has to render on docs.typo3.org, which builds a manual from Documentation/guides.xml and reads no Settings.cfg (a single README.rst serves an extension too small for one): when an extension has no documentation yet, or when creating, editing or reviewing Documentation/*.rst, guides.xml, README.md or XLF translations, rendering docs with Docker, TYPO3 RST directives, screenshots, or XLIFF 2-space indentation (TYPO3 v14+).
Extract a DDD-style ubiquitous language glossary from the current conversation, flagging ambiguities and proposing canonical terms. Saves to UBIQUITOUS_LANGUAGE.md. Use when user wants to define domain terms, build a glossary, harden terminology, create a ubiquitous language, or mentions "domain model" or "DDD".
Unity async and coroutine correctness patterns. Catches common mistakes with Awaitable double-await, missing cancellation tokens, thread context after BackgroundThreadAsync, coroutine error swallowing, batch mode WaitForEndOfFrame, and Addressables handle leaks. PATTERN format: WHEN/WRONG/RIGHT/GOTCHA. Based on Unity 6.3 LTS documentation.
Unity 6 multiplayer and networking guide. Use when building multiplayer games, working with Netcode for GameObjects, NetworkManager, NetworkObject, NetworkBehaviour, RPCs (ServerRpc, ClientRpc), NetworkVariables, or Unity multiplayer services (Relay, Lobby). Covers client-server architecture, state synchronization, and scene management. Based on Unity 6.3 LTS documentation.
React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance improvements.
Implement and deliver an authorized change end to end — verify, open the PR, merge, and confirm post-merge state — using live-state gates, durable interruption handoffs, and live-state-first resumption. Use when a user grants end-to-end delivery authority for a specific change and the work may cross tool-call limits, context exhaustion, worker loss, or session interruptions before the delivery boundary is reached. Do not use for plain fixes with no delivery directive, for granting merge or post-merge authority the user did not grant, or for designing release pipelines (use release-engineering for that).
Use this skill to gate DDD and ubiquitous-language quality with a pass/fail adversarial review — a single blind reviewer subagent judges a diff, a module/bounded context, or a DSL/semantic-model surface against 20 decidable rules across glossary lifecycle (a recorded ubiquitous language is required once domain concepts exist — absence is FAIL; code must conform; entries stay live and carry business meaning), language consistency (one name per concept, one meaning per name, no Manager/Helper/Data names on domain rules, transitions named as operations, one vocabulary across code, tests, docs, UI copy), domain model integrity (anemic models, valid-on-construction, value types over primitives, named states over flag piles), context boundaries (foreign-model reach, vendor-type absorption, infrastructure in the domain, multiple writers), and DSL surfaces. Language-agnostic; repeated runs converge code, team, and stakeholders on one recorded vocabulary. Verdicts only.
New to MCP?
From what the protocol is to installing your first server, these answers cover most first questions.
An open protocol that defines how AI applications connect to external tools and data in a uniform way. Clients talk to the model; MCP servers provide tools, resources and prompt templates. They exchange standard messages, so one server can be reused by many clients.