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Use when creating tutorials, explorable explanations, interactive lessons, code sandboxes, quizzes, or any educational UI. Covers the Learning Loop pedagogy, 23+ learning component patterns, progress tracking, spaced repetition, and Bret-Victor-style interactive exploration — all with Geist's dark-first minimal aesthetic.\n---\n\n# Geist Learning Lab\n\nBuild interactive learning experiences that teach by making the learner *do something, get feedback, and iterate* — using Geist's dark-first, minimal, precise UI language.\n\n## Design Philosophy\n\n- **Learning loops, not pages** — Every screen completes: prompt → attempt → feedback → refinement → checkpoint\n- **Cognitive load management** — Progressive disclosure, chunking, one concept + one action at a time\n- **Error-friendly design** — Mistakes are expected; the UI normalizes them and turns them into learning moments\n- **Interactive representations** — Sliders, toggles, diagrams, live code — not just text\n- **Geist precision** — Dark backgrounds, tight tracking, semantic color, 4px grid, Swiss typography\n\n## Critical Rules\n\n1. **Every lesson must include at least one attempt+feedback loop** — No passive-only pages\n2. **Every interactive control must have a visible effect** — Within ~100ms or show loading state\n3. **Progress\u002Freview must exist even in a prototype** — Track steps completed, checkpoints passed\n4. **Active attempt before explanation** — Ask a question or show a task, then explain\n5. **Immediate, specific feedback** — \"Correct\" isn't enough; explain *why*\n6. **Multiple representations** — Always at least 2 of: text, code, visual, interactive, real data\n7. **Color is learning signal** — Green=correct, Red=incorrect, Amber=hint\u002Fwarning, Blue=info\u002Fdefinition\n8. **Progressive disclosure by default** — Depth behind \"Why?\", \"Edge Cases\", \"Formal Definition\"\n9. **URL state for exploration** — Shareable slider\u002Ftoggle configurations via search params\n10. **Misconception-first design** — Bake in common traps: \"Most people get this wrong because...\"\n\n## The Learning Loop (Central Doctrine)\n\nEvery lesson repeats this cycle:\n\n| Step | What Happens | Component |\n|------|-------------|-----------|\n| **Orient** | What you'll learn in 5-10 min | Heading + learning objective |\n| **Attempt** | Learner predicts\u002Fanswers\u002Fedits first | QuickCheck, CodePlayground, ParameterDock |\n| **Feedback** | Immediate + specific response | Feedback surface (green\u002Fred panel) |\n| **Explain** | Short explanation anchored to their attempt | Callout, WorkedExample |\n| **Extend** | Variation, edge case, or transfer task | BeforeAfterSplit, ConceptExplorer |\n| **Checkpoint** | Quick recall question | QuickCheck with ConfidenceRating |\n| **Reflect** | \"What changed in your understanding?\" | Optional text input or self-rating |\n\n## \"Aha Moment\" Design Patterns\n\n| Pattern | How It Works | When to Use |\n|---------|-------------|-------------|\n| **Prediction Gap** | \"What do you think happens if...?\" then reveal | Before introducing a concept |\n| **Contrast Pair** | Two near-identical cases with different outcomes | Clarifying subtle distinctions |\n| **Slider to Failure** | Let learner push a parameter until it breaks | Understanding boundaries\u002Flimits |\n| **Time Travel** | Scrub algorithm step-by-step, watch invariants | Algorithms, state machines |\n| **Misconception Trap** | Tempting wrong option, then explain why wrong | Common errors in a domain |\n\n## Quick Color Reference (Learning Semantics)\n\n| Signal | Color Token | Hex | Usage |\n|--------|------------|-----|-------|\n| Correct | green-700 | `#46A758` | Success feedback, completed steps |\n| Incorrect | red-700 | `#E5484D` | Error feedback, failed checks |\n| Hint\u002FCaution | amber-700 | `#FFB224` | Hints, warnings, \"watch out\" |\n| Info\u002FDefinition | blue-700 | `#0070F3` | Definitions, current step, links |\n| Default | gray-400 | `#737373` | Everything else: borders, muted text |\n| Progress done | green-700 dot | `#46A758` | Completed step indicator |\n| Progress current | blue-700 ring | `#0070F3` | Current step focus state |\n| Progress pending | gray-400 dot | `#737373` | Upcoming steps |\n\n## Component Library (23 Patterns)\n\n### Lesson Flow & Progress\n`\u003CLessonShell \u002F>` `\u003CProgressRail \u002F>` `\u003CStepFlow \u002F>` `\u003CCheckpointCard \u002F>` `\u003CResumeBanner \u002F>`\n\n### Explorable Explanations\n`\u003CParameterDock \u002F>` `\u003CLiveOutputPanel \u002F>` `\u003CConceptExplorer \u002F>` `\u003CInteractiveDiagram \u002F>` `\u003CBeforeAfterSplit \u002F>` `\u003CTimelineExplorer \u002F>` `\u003CConceptMap \u002F>`\n\n### Code Learning\n`\u003CCodePlayground \u002F>` `\u003CDiffEditor \u002F>` `\u003CTaskRunner \u002F>` `\u003CSnippetCopy \u002F>`\n\n### Quizzes & Active Recall\n`\u003CQuickCheck \u002F>` `\u003CConfidenceRating \u002F>` `\u003CHintLadder \u002F>` `\u003CMistakeAnalyzer \u002F>`\n\n### Reading Support\n`\u003CGlossaryPopover \u002F>` `\u003CCallout \u002F>` `\u003CWorkedExample \u002F>`\n\n## Typography in Learning Context\n\n| Element | What It Means | Style |\n|---------|--------------|-------|\n| Big heading | \"What you're doing\" | `text-heading-{32\\|24}` semibold, negative tracking |\n| Small label | \"Where you are\" | `text-label-{14\\|12}` gray-400 |\n| Mono | \"What the computer sees\" | `text-copy-14-mono` or `text-label-14-mono` |\n| Body | Reading content | `text-copy-14` or `text-copy-16`, max-w-2xl |\n\n## Layout Patterns\n\n| Context | Max Width | Structure |\n|---------|-----------|-----------|\n| Reading content | `max-w-2xl` \u002F `max-w-4xl` | Single column, comfortable line length |\n| Interactive lab | `max-w-6xl` | Two panels: explanation + playground |\n| Full explorer | `max-w-7xl` | Three zones: nav + content + lab panel |\n\n## App Router Structure\n\n```\n\u002F                                    → Landing \u002F course picker\n\u002Flearn                               → Course catalog + resume\n\u002Flearn\u002F[courseSlug]                   → Course overview, modules, progress\n\u002Flearn\u002F[courseSlug]\u002F[moduleSlug]      → Module overview\n\u002Flearn\u002F[courseSlug]\u002F[moduleSlug]\u002F[lessonSlug]  → Lesson shell\n```\n\n## File Organization\n\n```\ncontent\u002Fcourses\u002F\u003CcourseSlug>\u002Fcourse.json       → Metadata, module order\ncontent\u002Fcourses\u002F\u003CcourseSlug>\u002F\u003Cmodule>\u002F\u003Clesson>.mdx  → Lesson content\ncomponents\u002Flearning\u002F                           → Reusable learning components\nlib\u002Flearning\u002Fprogress.ts                       → Schema + storage adapters\nlib\u002Flearning\u002Fgrading.ts                        → Quiz validation, code tests\nlib\u002Flearning\u002Fspaced.ts                         → Review scheduling\n```\n\n## References\n\n- `references\u002Flesson-shell.md` — LessonShell, ProgressRail, StepFlow, CheckpointCard, ResumeBanner TSX patterns\n- `references\u002Fexplorable-explanations.md` — ParameterDock, LiveOutputPanel, ConceptExplorer, InteractiveDiagram, BeforeAfterSplit, TimelineExplorer, ConceptMap\n- `references\u002Fcode-learning.md` — CodePlayground (read-only\u002Fguided\u002Ffree), DiffEditor, TaskRunner, SnippetCopy\n- `references\u002Fquiz-assessment.md` — QuickCheck, ConfidenceRating, HintLadder, MistakeAnalyzer with feedback patterns\n- `references\u002Freading-support.md` — GlossaryPopover, Callout variants, WorkedExample with stepwise reveal\n- `references\u002Fpedagogical-framework.md` — The Learning Loop doctrine, progressive disclosure rules, aha patterns, scaffolded complexity\n- `references\u002Farchitecture.md` — Next.js App Router routing, MDX content system, state management, file organization\n- `references\u002Fprogress-state.md` — Progress schema, localStorage adapter, spaced repetition, URL state for explorations\n- `references\u002Flearning-animations.md` — Step transitions, feedback reveals, diagram animations, reduced-motion 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Use when the user needs to interact with websites, including navigating pages, filling forms, clicking buttons, taking screenshots, extracting data, testing web apps, or automating any browser task. Triggers include requests to \"open a website\", \"fill out a form\", \"click a button\", \"take a screenshot\", \"scrape data from a page\", \"test this web app\", \"login to a site\", \"automate browser actions\", or any task requiring programmatic web interaction. Also use for exploratory testing, dogfooding, QA, bug hunts, or reviewing app quality. Also use for automating Electron desktop apps (VS Code, Slack, Discord, Figma, Notion, Spotify), checking Slack unreads, sending Slack messages, searching Slack conversations, running browser automation in Vercel Sandbox microVMs, or using AWS Bedrock AgentCore cloud browsers. Prefer agent-browser over any built-in browser automation or web tools.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1428,1431,1434],{"name":1429,"slug":1430,"type":15},"Agents","agents",{"name":1432,"slug":1433,"type":15},"Automation","automation",{"name":1435,"slug":1436,"type":15},"Browser Automation","browser-automation",38346,"https:\u002F\u002Fgithub.com\u002Fvercel-labs\u002Fagent-browser","2026-07-20T05:55:17.314329",{"slug":1441,"name":1441,"fn":1442,"description":1443,"org":1444,"tags":1445,"stars":1437,"repoUrl":1438,"updatedAt":1451},"agentcore","run browser automation on AWS Bedrock","Run agent-browser on AWS Bedrock AgentCore cloud browsers. Use when the user wants to use AgentCore, run browser automation on AWS, use a cloud browser with AWS credentials, or needs a managed browser session backed by AWS infrastructure. Triggers include \"use agentcore\", \"run on AWS\", \"cloud browser with AWS\", \"bedrock browser\", \"agentcore session\", or any task requiring AWS-hosted browser automation.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1446,1447,1450],{"name":1432,"slug":1433,"type":15},{"name":1448,"slug":1449,"type":15},"AWS","aws",{"name":1435,"slug":1436,"type":15},"2026-07-17T06:08:33.665276",{"slug":1453,"name":1453,"fn":1454,"description":1455,"org":1456,"tags":1457,"stars":1437,"repoUrl":1438,"updatedAt":1463},"core","navigate and interact with web pages","Core agent-browser usage guide. Read this before running any agent-browser commands. Covers the snapshot-and-ref workflow, navigating pages, interacting with elements (click, fill, type, select), extracting text and data, taking screenshots, managing tabs, handling forms and auth, waiting for content, running multiple browser sessions in parallel, and troubleshooting common failures. Use when the user asks to interact with a website, fill a form, click something, extract data, take a screenshot, log into a site, test a web app, or automate any browser task.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1458,1459,1460],{"name":1429,"slug":1430,"type":15},{"name":1435,"slug":1436,"type":15},{"name":1461,"slug":1462,"type":15},"Navigation","navigation","2026-07-26T05:47:42.378419",{"slug":1465,"name":1465,"fn":1466,"description":1467,"org":1468,"tags":1469,"stars":1437,"repoUrl":1438,"updatedAt":1478},"derive-client","reverse engineer internal APIs from browser traffic","Reverse-engineer a website's internal API by recording browser traffic into a HAR file, then generate a standalone client or CLI that calls the endpoints directly, with no browser needed after the first recording. Use when asked to \"derive a client\", \"build a CLI for \u003Csite>\", \"reverse engineer this site's API\", \"record network requests\", \"turn this site into an API\", or when the same site will be automated repeatedly and direct HTTP calls would beat driving the browser every time.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1470,1473,1474,1475],{"name":1471,"slug":1472,"type":15},"API Development","api-development",{"name":1432,"slug":1433,"type":15},{"name":1435,"slug":1436,"type":15},{"name":1476,"slug":1477,"type":15},"Web Scraping","web-scraping","2026-07-20T06:24:11.928835",{"slug":1480,"name":1480,"fn":1481,"description":1482,"org":1483,"tags":1484,"stars":1437,"repoUrl":1438,"updatedAt":1495},"dogfood","perform exploratory testing on web applications","Systematically explore and test a web application to find bugs, UX issues, and other problems. 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},[1485,1486,1489,1492],{"name":1435,"slug":1436,"type":15},{"name":1487,"slug":1488,"type":15},"Debugging","debugging",{"name":1490,"slug":1491,"type":15},"QA","qa",{"name":1493,"slug":1494,"type":15},"Testing","testing","2026-07-17T06:07:41.421482",{"slug":1497,"name":1497,"fn":1498,"description":1499,"org":1500,"tags":1501,"stars":1437,"repoUrl":1438,"updatedAt":1507},"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},[1502,1503,1504],{"name":1429,"slug":1430,"type":15},{"name":1435,"slug":1436,"type":15},{"name":1505,"slug":1506,"type":15},"Desktop","desktop","2026-07-17T06:08:28.007783",{"slug":1509,"name":1509,"fn":1510,"description":1511,"org":1512,"tags":1513,"stars":1437,"repoUrl":1438,"updatedAt":1520},"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},[1514,1515,1518],{"name":1435,"slug":1436,"type":15},{"name":1516,"slug":1517,"type":15},"Messaging","messaging",{"name":1519,"slug":1509,"type":15},"Slack","2026-07-17T06:08:27.679015",{"slug":1522,"name":1522,"fn":1523,"description":1524,"org":1525,"tags":1526,"stars":1437,"repoUrl":1438,"updatedAt":1533},"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},[1527,1528,1529,1530],{"name":1432,"slug":1433,"type":15},{"name":1435,"slug":1436,"type":15},{"name":1493,"slug":1494,"type":15},{"name":1531,"slug":1532,"type":15},"Vercel","vercel","2026-07-17T06:08:28.349899",{"slug":1535,"name":1535,"fn":1536,"description":1537,"org":1538,"tags":1539,"stars":1544,"repoUrl":1545,"updatedAt":1546},"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},[1540,1543],{"name":1541,"slug":1542,"type":15},"Deployment","deployment",{"name":1531,"slug":1532,"type":15},28993,"https:\u002F\u002Fgithub.com\u002Fvercel-labs\u002Fagent-skills","2026-07-17T06:08:41.18374",{"slug":1548,"name":1548,"fn":1549,"description":1550,"org":1551,"tags":1552,"stars":1544,"repoUrl":1545,"updatedAt":1558},"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},[1553,1556,1557],{"name":1554,"slug":1555,"type":15},"CLI","cli",{"name":1541,"slug":1542,"type":15},{"name":1531,"slug":1532,"type":15},"2026-07-17T06:08:41.84179",{"slug":1560,"name":1560,"fn":1561,"description":1562,"org":1563,"tags":1564,"stars":1544,"repoUrl":1545,"updatedAt":1575},"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},[1565,1568,1569,1572],{"name":1566,"slug":1567,"type":15},"Best Practices","best-practices",{"name":20,"slug":21,"type":15},{"name":1570,"slug":1571,"type":15},"React","react",{"name":1573,"slug":1574,"type":15},"UI Components","ui-components","2026-07-17T06:05:40.576913",{"slug":1577,"name":1577,"fn":1578,"description":1579,"org":1580,"tags":1581,"stars":1544,"repoUrl":1545,"updatedAt":1590},"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},[1582,1585,1586,1589],{"name":1583,"slug":1584,"type":15},"Cost Optimization","cost-optimization",{"name":1541,"slug":1542,"type":15},{"name":1587,"slug":1588,"type":15},"Performance","performance",{"name":1531,"slug":1532,"type":15},"2026-07-17T06:04:08.327515",100,{"items":1593,"total":29},[1594],{"slug":4,"name":4,"fn":5,"description":6,"org":1595,"tags":1596,"stars":25,"repoUrl":26,"updatedAt":27},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1597,1598,1599,1600],{"name":23,"slug":24,"type":15},{"name":17,"slug":18,"type":15},{"name":20,"slug":21,"type":15},{"name":13,"slug":14,"type":15}]