io.github.tabler/tabler/html-diff

Prove that a refactor changes no rendered HTML, using the `html-diff` harness over every preview page. Use before and after any change that is meant to be output-neutral — extracting or renaming a component, replacing hand-written markup with a `shared/ui` component, reordering props, restructuring a layout, migrating SCSS class emission — and whenever the user asks whether a change is safe or byte-identical. Covers capturing the baseline, reading the diff, and what counts as an acceptable difference.

io.github.prisma/orm/prisma-8

Comprehensive guide for building with Prisma 8 (Prisma Next), the contract-first data layer. Use whenever working on Prisma code in a project that uses it — authoring or editing the data contract (contract.prisma, PSL, TypeScript builders), migrations, queries (db.orm / db.sql), runtime wiring (db.ts, middleware, DATABASE_URL), build-tool integration, Supabase / RLS, reading PN-* structured errors, or filing feedback — and for orientation questions like "what is Prisma Next" or comparisons to other ORMs. Signals that this skill applies: @internal/* imports, prisma.config.ts, contract.prisma / contract.json / contract.d.ts, the prisma-next CLI, PN-* error codes. Also covers upgrading Prisma in a project — "upgrade Prisma 8", "bump Prisma Next", "move to Prisma Next X.Y", or dealing with an @internal/* version bump, in a consumer app or in an extension package. Does not apply to Prisma ORM 7 or earlier (schema.prisma + @prisma/client projects).

io.github.PostHog/posthog/splitting-oversized-modules

Split an oversized Python module (a thousand-plus-line logic.py, models.py, api.py, or its test file) into a package of one module per concern, mechanically and provably without changing behavior. Use on a request to split / break up / decompose a god module or move functions out of one, once a human has agreed to split one before some other change, or before restructuring code inside a module already over roughly a thousand lines — breaking up a long function or extracting helpers in place leaves everything in the same file, so check the worth-it gate and propose the split first. Covers that gate, assigning symbols to concerns with an acyclic dependency graph, the AST plus tokenize move script, and proving the result is a pure move. Python only — for frontend files use writing-ui-components. Not for extracting a shared helper into common/, and not for moving code between products, which is isolating-product-facade-contracts.

io.github.vercel-labs/agent-skills/react-view-transitions

Guide for implementing smooth, native-feeling animations using React's View Transition API (`<ViewTransition>` component, `addTransitionType`, and CSS view transition pseudo-elements). Use this skill whenever the user wants to add page transitions, animate route changes, create shared element animations, animate enter/exit of components, animate list reorder, implement directional (forward/back) navigation animations, or integrate view transitions in Next.js. Also use when the user mentions view transitions, `startViewTransition`, `ViewTransition`, transition types, or asks about animating between UI states in React without third-party animation libraries.

io.github.sickn33/agentic-awesome-skills/cursor-delegate

Delegate coding tasks to the Cursor Agent CLI (`cursor-agent`) only when the user explicitly requests it, while the orchestrator retains review and landing responsibility.

io.github.addyosmani/agent-skills/performance-optimization

Optimizes application performance across frontend, backend, queries, and databases. Use when performance requirements exist, when you suspect performance regressions, when Core Web Vitals or load times need improvement, when N+1 query patterns need fixing, or when profiling reveals bottlenecks.

io.github.gradio-app/gradio/gradio

Build Gradio web UIs and demos in Python. Use when creating, modifying, debugging, or answering questions about Gradio and its capabilties, components, event listeners, or layouts.

io.github.Agents365-ai/drawio-skill/drawio-skill

Use when the user requests diagrams, flowcharts, architecture diagrams, ER diagrams, UML / sequence / class diagrams, SysML / MBSE diagrams (block definition, internal block, requirement, parametric), BPMN business process diagrams, swimlane / cross-functional flowcharts, network topology, cloud architecture from Terraform or Kubernetes manifests, ML/DL model figures (Transformer/CNN/LSTM), mind maps, or any visualization. Also use proactively when explaining systems with 3+ components, complex data flows, or relationships that benefit from visual representation. Best suited when the diagram needs custom styling, rich shape vocabulary, swimlanes, or exportable images (PNG/SVG/PDF/JPG). Generates .drawio XML and exports locally via the native draw.io desktop CLI.

io.github.vercel/next.js/deploy-release-test

Validate a commit-specific Next.js preview package and manually trigger the entire Next.js deployment test suite through the test_e2e_deploy_release.yml GitHub Actions workflow. Use only when asked to run the full deploy test suite or this workflow specifically from an internal vercel/next.js PR branch. Do not use for focused deployment-test sanity checks; run the relevant tests locally with pnpm test-deploy instead. Covers resolving the latest branch SHA, waiting for vercel-packages, preserving default workflow inputs, dispatching the workflow, and verifying the run.

io.github.vercel/next.js/next-partial-prefetching-adoption

Turn on Partial Prefetching in a Next.js app and work through the insights it surfaces. Use when the user wants to enable or adopt Partial Prefetching, flip the `partialPrefetching` flag, opt routes in with `export const prefetch = 'partial'`, audit `Link prefetch={true}` behavior, preserve existing prefetched UI with `instant()` tests, or resolve the instant-link-prefetch-partial and instant-shell-url-data insights.

io.github.vercel/next.js/next-cache-components-optimizer

Drive a Next.js route to instant navigation by setting up an agentic loop, under Cache Components / PPR, on initial load (hard navigation) and client-side navigation (soft navigation). Encode the goal as a failing @next/playwright instant() e2e and work it to green, one verified route at a time; the shipped test then guards against regression. Use when asked to make a route's navigation instant (its static shell commits immediately), fix a route whose static shell isn't prerendered/served/prefetched, grow a route's static shell or fix its slow first paint, diagnose which Suspense boundary keeps a route out of its static shell, or write the instant() e2e guard for one. Requires Next.js 16.3+ with cacheComponents; directs an upgrade if older.

io.github.microsoft/vscode/agent-customization

**WORKFLOW SKILL** — Create, update, review, fix, or debug VS Code agent customization files (.instructions.md, .prompt.md, .agent.md, SKILL.md, copilot-instructions.md, AGENTS.md). USE FOR: saving coding preferences; troubleshooting why instructions/skills/agents are ignored or not invoked; configuring applyTo patterns; defining tool restrictions; creating custom agent modes or specialized workflows; packaging domain knowledge; fixing YAML frontmatter syntax. DO NOT USE FOR: general coding questions (use default agent); runtime debugging or error diagnosis; MCP server configuration (use MCP docs directly); VS Code extension development. INVOKES: file system tools (read/write customization files), ask-questions tool (interview user for requirements), subagents for codebase exploration. FOR SINGLE OPERATIONS: For quick YAML frontmatter fixes or creating a single file from a known pattern, edit the file directly — no skill needed.

io.github.garrytan/gbrain/postgres-adopt

Detect which gbrain engine is in use (PGLite vs Postgres), prefer Postgres for agent-harness installs, install/provision Postgres (Supabase discovery via SUPABASE_ACCESS_TOKEN, local Postgres, opt-in Docker), and move an existing PGLite brain with the guarded engine migration. Detection is one engine-free command; the install ladder is one flag.

io.github.deepseek-ai/deepseek-harness/editing-cordis-compositions

Use when creating, changing, or validating a Cordis composition for this harness — writing or editing an agent preset, adding or removing a plugin row, deciding whether something belongs to the host composition or to one session, checking whether a preset you authored actually mounts, or diagnosing a row that mounted but contributed nothing.

io.github.NousResearch/hermes-agent/publish-site

Versioned site deploys to GitHub/Cloudflare/Netlify Pages.

io.github.NousResearch/hermes-agent/agentmail

Use when an agent needs AgentMail CLI email inboxes.

io.github.browser-use/browser-use/open-source

Documentation reference for writing Python code using the browser-use open-source library. Use this skill whenever the user needs help with Agent, Browser, or Tools configuration, is writing code that imports from browser_use, asks about @sandbox deployment, supported LLM models, Actor API, custom tools, lifecycle hooks, MCP server setup, or monitoring/observability with Laminar or OpenLIT. Also trigger for questions about browser-use installation, prompting strategies, or sensitive data handling. Do NOT use this for Cloud API/SDK usage or pricing — use the cloud skill instead. Do NOT use this for directly automating a browser via CLI commands — use the browser-use skill instead.

io.github.PostHog/posthog/exploring-llm-traces

Debug and inspect LLM/AI agent traces using PostHog's MCP tools. Use when the user pastes a trace or session URL (e.g. /ai-observability/traces/<id> or /ai-observability/sessions/<id>), asks to debug a trace, figure out what went wrong, check if an agent used a tool correctly, verify context/files were surfaced, inspect subagent behavior, investigate LLM decisions, or analyze token usage and costs. Also use when raw SQL/HogQL against `events.properties.$ai_input` / `$ai_output_choices` returns empty — message content lives only on the dedicated `posthog.ai_events` table.

io.github.PostHog/posthog/maintaining-python-tests

Maintains existing pytest and Django test suites without weakening correctness. Use when asked to reduce Python test runtime or CI work, investigate slow pytest families, remove stale migration tests, consolidate repeated setup, improve Python test ownership, or measure whether a test optimization worked after merge. Ranks work by measured cost, applies the writing-tests value gate to existing coverage, preserves distinct behavior cases, validates isolation after shared-fixture changes, and separates testcase work from pytest-suite wall time. For an intermittent failure, use fixing-flaky-tests instead.

io.github.CherryHQ/cherry-studio/code-mate-hermes

Runs Hermes Agent in one-shot mode for bounded local tasks. Use when the user explicitly asks to delegate work to Hermes and accepts its automatic tool approval behavior.

io.github.openclaw/openclaw/clawdtributor

Clawtributor PRs here, last week or another window: discover conversation refs, recheck GitHub, rank by impact.

io.github.slopus/happy/release

Release pipeline for CLI, mobile, web, and server. Guides through version bumping, building, testing, publishing, and deploying. Replaces the old interactive release-it flow with a Claude Code-native experience. Use when user types /release or asks to release, publish, deploy, or ship any component.

io.github.lobehub/lobehub/compose-atoms

Decompose a heavy domain feature into mountable capability atoms. Use when a Viewer/Page/index.tsx owns fetch, filters, mutations, modals, and host integrations together; a visual split still leaves store calls and actions on the page; a portal, embed, share, mobile, or micro-app needs a subset of the same domain; or a new capability is landing as another `readOnly`/`mode`/`variant` flag. Triggers on `compose-atoms`, sink state, 状态下沉, 重业务拆分, 拆成原子, 原子组件, 组装, god component, fat viewer, module graph, slot composition, host seam.

io.github.dotnet/aspnetcore/validate-blazor-feature

Validate a Blazor feature or behavior interactively in a browser using the canonical Components samples in this repo, before writing E2E tests. USE FOR exercising a Blazor change in src/Components (a render-mode behavior, an interactive component, enhanced navigation, forms, streaming, prerendering), deciding which sample to use, where to add a test page, how to set the render mode (Server/WebAssembly/Auto/static SSR), how to confirm the app is actually interactive (not just static SSR), and how to inspect the browser console and network for errors. Covers BlazorWebAppGlobal, BlazorWebAppPerPage, and BlazorWebAssemblyStandalone, launching them against the in-tree framework, and driving them with the Playwright MCP browser tools. DO NOT USE FOR writing permanent E2E/Selenium or unit tests, non-Components areas, comparative alternatives research, or isolated native-browser API/HTML/CSS experiments when no Blazor feature implementation is being validated; prefer a minimal browser probe instead.