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Accepts two URLs (file:\u002F\u002F, http:\u002F\u002F, https:\u002F\u002F) or two image paths.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},"vercel-labs","Vercel Labs","https:\u002F\u002Fpexgzepcugksgbtrxkhf.supabase.co\u002Fstorage\u002Fv1\u002Fobject\u002Fpublic\u002Forg-logos\u002Fvercel-labs.png",[12,16,19],{"name":13,"slug":14,"type":15},"Screenshots","screenshots","tag",{"name":17,"slug":18,"type":15},"Testing","testing",{"name":20,"slug":21,"type":15},"Frontend","frontend",200,"https:\u002F\u002Fgithub.com\u002Fvercel-labs\u002Fbefore-and-after","2026-07-17T06:06:04.452007",null,9,[],{"repoUrl":23,"stars":22,"forks":26,"topics":29,"description":25},[],"https:\u002F\u002Fgithub.com\u002Fvercel-labs\u002Fbefore-and-after\u002Ftree\u002FHEAD\u002Fskill","---\nname: before-and-after\ndescription: Captures before\u002Fafter screenshots of web pages or elements for visual comparison. Use when user says \"take before and after\", \"screenshot comparison\", \"visual diff\", \"PR screenshots\", \"compare old and new\", or needs to document UI changes. Accepts two URLs (file:\u002F\u002F, http:\u002F\u002F, https:\u002F\u002F) or two image paths.\nallowed-tools:\n  - Bash(npx @vercel\u002Fbefore-and-after *)\n  - Bash(before-and-after *)\n  - Bash(which before-and-after)\n  - Bash(npm install -g @vercel\u002Fbefore-and-after)\n  - Bash(*\u002Fupload-and-copy.sh *)\n  - Bash(curl -s -o \u002Fdev\u002Fnull -w *)\n  - Bash(gh pr view *)\n  - Bash(gh pr edit *)\n  - Bash(vercel inspect *)\n  - Bash(vercel whoami)\n  - Bash(which vercel)\n  - Bash(which gh)\n---\n\n# Before-After Screenshot Skill\n\n> **Package:** `@vercel\u002Fbefore-and-after`\n> Never use `before-and-after` (wrong package).\n\n## Agent Behavior Rules\n\n**DO NOT:**\n- Switch git branches, stash changes, start dev servers, or assume what \"before\" is\n- Use `--full` unless user explicitly asks for full page \u002F full scroll capture\n\n**DO:**\n- Use `--markdown` when user wants PR integration or markdown output\n- Use `--mobile` \u002F `--tablet` if user mentions phone, mobile, tablet, responsive, etc.\n- Assume current state is **After**\n- If user provides only one URL or says \"PR screenshots\" without URLs, **ASK**: \"What URL should I use for the 'before' state? (production URL, preview deployment, or another local port)\"\n\n## Execution Order (MUST follow)\n\n1. **Pre-flight** — `which before-and-after || npm install -g @vercel\u002Fbefore-and-after`\n2. **Protection check** — if `.vercel.app` URL: `curl -s -o \u002Fdev\u002Fnull -w \"%{http_code}\" \"\u003Curl>\"` (401\u002F403 = protected)\n3. **Capture** — `before-and-after \"\u003Cbefore-url>\" \"\u003Cafter-url>\"`\n4. **Upload** — `.\u002Fscripts\u002Fupload-and-copy.sh \u003Cbefore.png> \u003Cafter.png> --markdown`\n5. **PR integration** — optionally `gh pr edit` to append markdown\n\n**Never skip steps 1-2.**\n\n## Quick Reference\n\n```bash\n# Basic usage\nbefore-and-after \u003Cbefore-url> \u003Cafter-url>\n\n# With selector\nbefore-and-after url1 url2 \".hero-section\"\n\n# Different selectors for each\nbefore-and-after url1 url2 \".old-card\" \".new-card\"\n\n# Viewports\nbefore-and-after url1 url2 --mobile    # 375x812\nbefore-and-after url1 url2 --tablet    # 768x1024\nbefore-and-after url1 url2 --full      # full scroll\n\n# From existing images\nbefore-and-after before.png after.png --markdown\n\n# Via npx (use full package name!)\nnpx @vercel\u002Fbefore-and-after url1 url2\n```\n\n| Flag | Description |\n|------|-------------|\n| `-m, --mobile` | Mobile viewport (375x812) |\n| `-t, --tablet` | Tablet viewport (768x1024) |\n| `--size \u003CWxH>` | Custom viewport |\n| `-f, --full` | Full scrollable page |\n| `-s, --selector` | CSS selector to capture |\n| `-o, --output` | Output directory (default: ~\u002FDownloads) |\n| `--markdown` | Upload images & output markdown table |\n| `--upload-url \u003Curl>` | Custom upload endpoint (default: 0x0.st) |\n\n## Image Upload\n\n```bash\n# Default (0x0.st - no signup needed)\n.\u002Fscripts\u002Fupload-and-copy.sh before.png after.png --markdown\n\n# GitHub Gist\nIMAGE_ADAPTER=gist .\u002Fscripts\u002Fupload-and-copy.sh before.png after.png --markdown\n```\n\n## Vercel Deployment Protection\n\nIf `.vercel.app` URL returns 401\u002F403:\n\n1. Check Vercel CLI: `which vercel && vercel whoami`\n2. If available: `vercel inspect \u003Curl>` to get bypass token\n3. 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Use when asked to \"dogfood\", \"QA\", \"exploratory test\", \"find issues\", \"bug hunt\", \"test this app\u002Fsite\u002Fplatform\", or review the quality of a web application. Produces a structured report with full reproduction evidence -- step-by-step screenshots, repro videos, and detailed repro steps for every issue -- so findings can be handed directly to the responsible teams.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1329,1330,1333,1336],{"name":1279,"slug":1280,"type":15},{"name":1331,"slug":1332,"type":15},"Debugging","debugging",{"name":1334,"slug":1335,"type":15},"QA","qa",{"name":17,"slug":18,"type":15},"2026-07-17T06:07:41.421482",{"slug":1339,"name":1339,"fn":1340,"description":1341,"org":1342,"tags":1343,"stars":1281,"repoUrl":1282,"updatedAt":1349},"electron","automate Electron desktop applications","Automate Electron desktop apps (VS Code, Slack, Discord, Figma, Notion, Spotify, etc.) using agent-browser via Chrome DevTools Protocol. Use when the user needs to interact with an Electron app, automate a desktop app, connect to a running app, control a native app, or test an Electron application. Triggers include \"automate Slack app\", \"control VS Code\", \"interact with Discord app\", \"test this Electron app\", \"connect to desktop app\", or any task requiring automation of a native Electron application.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1344,1345,1346],{"name":1273,"slug":1274,"type":15},{"name":1279,"slug":1280,"type":15},{"name":1347,"slug":1348,"type":15},"Desktop","desktop","2026-07-17T06:08:28.007783",{"slug":1351,"name":1351,"fn":1352,"description":1353,"org":1354,"tags":1355,"stars":1281,"repoUrl":1282,"updatedAt":1362},"slack","interact with Slack workspaces","Interact with Slack workspaces using browser automation. Use when the user needs to check unread channels, navigate Slack, send messages, extract data, find information, search conversations, or automate any Slack task. Triggers include \"check my Slack\", \"what channels have unreads\", \"send a message to\", \"search Slack for\", \"extract from Slack\", \"find who said\", or any task requiring programmatic Slack interaction.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1356,1357,1360],{"name":1279,"slug":1280,"type":15},{"name":1358,"slug":1359,"type":15},"Messaging","messaging",{"name":1361,"slug":1351,"type":15},"Slack","2026-07-17T06:08:27.679015",{"slug":1364,"name":1364,"fn":1365,"description":1366,"org":1367,"tags":1368,"stars":1281,"repoUrl":1282,"updatedAt":1375},"vercel-sandbox","run browser automation in Vercel Sandbox","Run agent-browser + Chrome inside Vercel Sandbox microVMs for browser automation from any Vercel-deployed app. Use when the user needs browser automation in a Vercel app (Next.js, SvelteKit, Nuxt, Remix, Astro, etc.), wants to run headless Chrome without binary size limits, needs persistent browser sessions across commands, or wants ephemeral isolated browser environments. Triggers include \"Vercel Sandbox browser\", \"microVM Chrome\", \"agent-browser in sandbox\", \"browser automation on Vercel\", or any task requiring Chrome in a Vercel Sandbox.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1369,1370,1371,1372],{"name":1276,"slug":1277,"type":15},{"name":1279,"slug":1280,"type":15},{"name":17,"slug":18,"type":15},{"name":1373,"slug":1374,"type":15},"Vercel","vercel","2026-07-17T06:08:28.349899",{"slug":1377,"name":1377,"fn":1378,"description":1379,"org":1380,"tags":1381,"stars":1386,"repoUrl":1387,"updatedAt":1388},"deploy-to-vercel","deploy applications to Vercel","Deploy applications and websites to Vercel. Use when the user requests deployment actions like \"deploy my app\", \"deploy and give me the link\", \"push this live\", or \"create a preview deployment\".",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1382,1385],{"name":1383,"slug":1384,"type":15},"Deployment","deployment",{"name":1373,"slug":1374,"type":15},28993,"https:\u002F\u002Fgithub.com\u002Fvercel-labs\u002Fagent-skills","2026-07-17T06:08:41.18374",{"slug":1390,"name":1390,"fn":1391,"description":1392,"org":1393,"tags":1394,"stars":1386,"repoUrl":1387,"updatedAt":1400},"vercel-cli-with-tokens","manage Vercel projects via CLI","Deploy and manage projects on Vercel using token-based authentication. Use when working with Vercel CLI using access tokens rather than interactive login — e.g. \"deploy to vercel\", \"set up vercel\", \"add environment variables to vercel\".",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1395,1398,1399],{"name":1396,"slug":1397,"type":15},"CLI","cli",{"name":1383,"slug":1384,"type":15},{"name":1373,"slug":1374,"type":15},"2026-07-17T06:08:41.84179",{"slug":1402,"name":1402,"fn":1403,"description":1404,"org":1405,"tags":1406,"stars":1386,"repoUrl":1387,"updatedAt":1417},"vercel-composition-patterns","implement scalable React composition patterns","React composition patterns that scale. Use when refactoring components with boolean prop proliferation, building flexible component libraries, or designing reusable APIs. Triggers on tasks involving compound components, render props, context providers, or component architecture. Includes React 19 API changes.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1407,1410,1411,1414],{"name":1408,"slug":1409,"type":15},"Best Practices","best-practices",{"name":20,"slug":21,"type":15},{"name":1412,"slug":1413,"type":15},"React","react",{"name":1415,"slug":1416,"type":15},"UI Components","ui-components","2026-07-17T06:05:40.576913",{"slug":1419,"name":1419,"fn":1420,"description":1421,"org":1422,"tags":1423,"stars":1386,"repoUrl":1387,"updatedAt":1432},"vercel-optimize","optimize Vercel project performance and costs","Use for Vercel cost and performance optimization on deployed projects, especially Next.js, SvelteKit, Nuxt, and limited Astro apps. Collect Vercel metrics, usage, project config, and code scan results first; investigate only metric-backed candidates; produce ranked recommendations grounded in verified files and version-aware Vercel\u002Fframework docs. Trigger for Vercel bill reduction, slow or expensive routes, caching opportunities, Function Invocations, Build Minutes, Fast Data Transfer, Core Web Vitals, Bot Management, Fluid compute, or cost breakdown requests.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1424,1427,1428,1431],{"name":1425,"slug":1426,"type":15},"Cost Optimization","cost-optimization",{"name":1383,"slug":1384,"type":15},{"name":1429,"slug":1430,"type":15},"Performance","performance",{"name":1373,"slug":1374,"type":15},"2026-07-17T06:04:08.327515",100]