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Own the runtime: reuse or background-start d3k non-interactively, wait for readiness, use its project-stable managed Chrome profile, and inspect unified browser\u002Fserver evidence.\"\n---\n\n# d3k Agent Runtime\n\nd3k is the local web runtime for this task. It starts the dev server behind a stable Portless URL, owns a project-stable Chrome profile, and records server logs, browser console output, network activity, interactions, and screenshots in one timeline.\n\nWhen this skill triggers, operate d3k. Do not merely tell the user how to run it.\n\n## Interpret the Request\n\n- \"Let me test\u002Fdev my project with d3k\": prepare the runtime and headed browser, confirm it is ready, then hand control to the user. Wait for them to reproduce the issue before inspecting evidence.\n- \"Test\u002Fdebug\u002Ffix this with d3k\": prepare the runtime, then drive the managed browser and investigate autonomously.\n- If ambiguous, start the runtime and browser first. That action is safe and useful for either path.\n\n## Start or Reuse d3k\n\nRun from the project root.\n\n1. Check for an existing project runtime:\n\n```bash\nd3k status --json\n```\n\nIf it reports `\"running\": true`, reuse it. Do not start a second dev server or browser.\n\n2. If d3k is not installed, install it:\n\n```bash\nbun install -g dev3000\n```\n\nUse `npm install -g dev3000` only when Bun is unavailable.\n\n3. Start d3k with the agent's shell\u002Fprocess tool as a retained background or yielded session:\n\n```bash\nd3k --no-agent --no-tui -t\n```\n\nDo not wait for this long-running command to exit. Keep its process\u002Fsession handle so you can monitor or stop it later. Prefer the execution tool's background\u002Fsession support over shelling with `&`.\n\nIf the target URL is already known, pass it so the managed browser opens there:\n\n```bash\nd3k --no-agent --no-tui -t --app-url \"\u003Curl>\"\n```\n\nLet d3k auto-detect the package manager, dev command, and port. Add `--command`, `--script`, or `--port` only when detection is wrong or the user specified them.\n\n4. Poll until the runtime is ready:\n\n```bash\nd3k status --json\n```\n\nA successful status response is the readiness boundary. Prefer the reported Portless `appUrl`; the underlying app port may change between runs. If startup fails, inspect the retained process output and `d3k logs --type server`; do not launch a separate dev server.\n\n## User-Driven Testing\n\nWhen the user says \"let me test\":\n\n1. Confirm the status response includes the app URL and `\"browserConnected\": true`.\n2. Tell the user the monitored browser is ready.\n3. Keep the d3k process running and wait for the user to reproduce the behavior.\n4. When they report that it happened, begin with:\n\n```bash\nd3k errors --context\nd3k logs -n 200\n```\n\nDo not replace the headed browser with automation while the user is testing.\n\n## Agent-Driven Testing\n\nDrive the exact browser d3k is monitoring:\n\n```bash\nd3k agent-browser snapshot -i\nd3k agent-browser click @e2\nd3k agent-browser fill @e3 \"text\"\nd3k errors --context\n```\n\nUse `--require-d3k-browser` when opening a URL so failure cannot silently create another browser:\n\n```bash\nd3k agent-browser --require-d3k-browser open \"\u003Curl>\"\n```\n\nAfter every reproduction or code change, replay the relevant interaction and check `d3k errors --context` again.\n\n## Evidence Commands\n\nPrefer these over ad-hoc log scraping:\n\n```bash\nd3k status --json\nd3k errors --context\nd3k logs -n 200\nd3k logs --type browser\nd3k logs --type server\n```\n\nArtifacts live under `~\u002F.d3k\u002F\u003Cproject>\u002F`, including `session.json`, logs, screenshots, and the Chrome profile.\n\n## Browser and Auth Safety\n\nd3k must own browser startup by default. Its per-project Chrome profile preserves login state, cookies, and local storage.\n\nFor Google OAuth, Supabase auth, and other auth-sensitive flows, never substitute raw Chrome, Playwright, a browser MCP session, manual CDP attachment, or `agent-browser --profile`. Those paths use a different browser\u002Fprofile and can trigger \"This browser or app may not be secure.\"\n\nIf the managed browser is unavailable, stop or interrupt the retained d3k process and restart d3k cleanly. Do not work around it by creating another browser.\n\nUse `--headless` only for CI or when explicitly requested. Use `--servers-only` only when browser monitoring is intentionally unwanted.\n\n## Operating Rules\n\n- Do not run `npm run dev`, `bun run dev`, or another dev server alongside d3k.\n- Do not start a second d3k when `d3k status --json` reports an active one.\n- Keep d3k alive across edits and retests.\n- Preserve the project-stable Chrome profile unless the user explicitly asks for a fresh profile.\n- Leave the runtime running when handing a headed browser to the user; stop it only when asked or when the task requires a clean restart.\n- Portless routing is the default. 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server\n",[676],{"type":45,"tag":120,"props":677,"children":678},{"__ignoreMap":117},[679,694,709,728,749],{"type":45,"tag":124,"props":680,"children":681},{"class":126,"line":127},[682,686,690],{"type":45,"tag":124,"props":683,"children":684},{"style":131},[685],{"type":51,"value":4},{"type":45,"tag":124,"props":687,"children":688},{"style":136},[689],{"type":51,"value":139},{"type":45,"tag":124,"props":691,"children":692},{"style":136},[693],{"type":51,"value":144},{"type":45,"tag":124,"props":695,"children":696},{"class":126,"line":160},[697,701,705],{"type":45,"tag":124,"props":698,"children":699},{"style":131},[700],{"type":51,"value":4},{"type":45,"tag":124,"props":702,"children":703},{"style":136},[704],{"type":51,"value":453},{"type":45,"tag":124,"props":706,"children":707},{"style":136},[708],{"type":51,"value":458},{"type":45,"tag":124,"props":710,"children":711},{"class":126,"line":212},[712,716,720,724],{"type":45,"tag":124,"props":713,"children":714},{"style":131},[715],{"type":51,"value":4},{"type":45,"tag":124,"props":717,"children":718},{"style":136},[719],{"type":51,"value":470},{"type":45,"tag":124,"props":721,"children":722},{"style":136},[723],{"type":51,"value":475},{"type":45,"tag":124,"props":725,"children":726},{"style":478},[727],{"type":51,"value":481},{"type":45,"tag":124,"props":729,"children":730},{"class":126,"line":345},[731,735,739,744],{"type":45,"tag":124,"props":732,"children":733},{"style":131},[734],{"type":51,"value":4},{"type":45,"tag":124,"props":736,"children":737},{"style":136},[738],{"type":51,"value":470},{"type":45,"tag":124,"props":740,"children":741},{"style":136},[742],{"type":51,"value":743}," --type",{"type":45,"tag":124,"props":745,"children":746},{"style":136},[747],{"type":51,"value":748}," browser\n",{"type":45,"tag":124,"props":750,"children":752},{"class":126,"line":751},5,[753,757,761,765],{"type":45,"tag":124,"props":754,"children":755},{"style":131},[756],{"type":51,"value":4},{"type":45,"tag":124,"props":758,"children":759},{"style":136},[760],{"type":51,"value":470},{"type":45,"tag":124,"props":762,"children":763},{"style":136},[764],{"type":51,"value":743},{"type":45,"tag":124,"props":766,"children":767},{"style":136},[768],{"type":51,"value":769}," server\n",{"type":45,"tag":54,"props":771,"children":772},{},[773,775,781,783,789],{"type":51,"value":774},"Artifacts live under ",{"type":45,"tag":120,"props":776,"children":778},{"className":777},[],[779],{"type":51,"value":780},"~\u002F.d3k\u002F\u003Cproject>\u002F",{"type":51,"value":782},", including ",{"type":45,"tag":120,"props":784,"children":786},{"className":785},[],[787],{"type":51,"value":788},"session.json",{"type":51,"value":790},", logs, screenshots, and the Chrome profile.",{"type":45,"tag":65,"props":792,"children":794},{"id":793},"browser-and-auth-safety",[795],{"type":51,"value":796},"Browser and Auth Safety",{"type":45,"tag":54,"props":798,"children":799},{},[800],{"type":51,"value":801},"d3k must own browser startup by default. Its per-project Chrome profile preserves login state, cookies, and local storage.",{"type":45,"tag":54,"props":803,"children":804},{},[805,807,813],{"type":51,"value":806},"For Google OAuth, Supabase auth, and other auth-sensitive flows, never substitute raw Chrome, Playwright, a browser MCP session, manual CDP attachment, or ",{"type":45,"tag":120,"props":808,"children":810},{"className":809},[],[811],{"type":51,"value":812},"agent-browser --profile",{"type":51,"value":814},". Those paths use a different browser\u002Fprofile and can trigger \"This browser or app may not be secure.\"",{"type":45,"tag":54,"props":816,"children":817},{},[818],{"type":51,"value":819},"If the managed browser is unavailable, stop or interrupt the retained d3k process and restart d3k cleanly. Do not work around it by creating another browser.",{"type":45,"tag":54,"props":821,"children":822},{},[823,824,830,832,838],{"type":51,"value":201},{"type":45,"tag":120,"props":825,"children":827},{"className":826},[],[828],{"type":51,"value":829},"--headless",{"type":51,"value":831}," only for CI or when explicitly requested. Use ",{"type":45,"tag":120,"props":833,"children":835},{"className":834},[],[836],{"type":51,"value":837},"--servers-only",{"type":51,"value":839}," only when browser monitoring is intentionally unwanted.",{"type":45,"tag":65,"props":841,"children":843},{"id":842},"operating-rules",[844],{"type":51,"value":845},"Operating Rules",{"type":45,"tag":72,"props":847,"children":848},{},[849,869,882,887,892,897],{"type":45,"tag":76,"props":850,"children":851},{},[852,854,860,861,867],{"type":51,"value":853},"Do not run ",{"type":45,"tag":120,"props":855,"children":857},{"className":856},[],[858],{"type":51,"value":859},"npm run dev",{"type":51,"value":326},{"type":45,"tag":120,"props":862,"children":864},{"className":863},[],[865],{"type":51,"value":866},"bun run dev",{"type":51,"value":868},", or another dev server alongside d3k.",{"type":45,"tag":76,"props":870,"children":871},{},[872,874,880],{"type":51,"value":873},"Do not start a second d3k when ",{"type":45,"tag":120,"props":875,"children":877},{"className":876},[],[878],{"type":51,"value":879},"d3k status --json",{"type":51,"value":881}," reports an active one.",{"type":45,"tag":76,"props":883,"children":884},{},[885],{"type":51,"value":886},"Keep d3k alive across edits and retests.",{"type":45,"tag":76,"props":888,"children":889},{},[890],{"type":51,"value":891},"Preserve the project-stable Chrome profile unless the user explicitly asks for a fresh profile.",{"type":45,"tag":76,"props":893,"children":894},{},[895],{"type":51,"value":896},"Leave the runtime running when handing a headed browser to the user; stop it only when asked or when the task requires a clean restart.",{"type":45,"tag":76,"props":898,"children":899},{},[900,902,908,910,916],{"type":51,"value":901},"Portless routing is the default. Use ",{"type":45,"tag":120,"props":903,"children":905},{"className":904},[],[906],{"type":51,"value":907},"--no-portless",{"type":51,"value":909}," or ",{"type":45,"tag":120,"props":911,"children":913},{"className":912},[],[914],{"type":51,"value":915},"PORTLESS=0",{"type":51,"value":917}," only when direct localhost routing is explicitly required.",{"type":45,"tag":919,"props":920,"children":921},"style",{},[922],{"type":51,"value":923},"html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}",{"items":925,"total":1095},[926,944,956,968,983,998,1010,1023,1036,1049,1061,1080],{"slug":927,"name":927,"fn":928,"description":929,"org":930,"tags":931,"stars":941,"repoUrl":942,"updatedAt":943},"agent-browser","automate browser interactions for AI agents","Browser automation CLI for AI agents. 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},[932,935,938],{"name":933,"slug":934,"type":15},"Agents","agents",{"name":936,"slug":937,"type":15},"Automation","automation",{"name":939,"slug":940,"type":15},"Browser Automation","browser-automation",38346,"https:\u002F\u002Fgithub.com\u002Fvercel-labs\u002Fagent-browser","2026-07-20T05:55:17.314329",{"slug":945,"name":945,"fn":946,"description":947,"org":948,"tags":949,"stars":941,"repoUrl":942,"updatedAt":955},"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},[950,951,954],{"name":936,"slug":937,"type":15},{"name":952,"slug":953,"type":15},"AWS","aws",{"name":939,"slug":940,"type":15},"2026-07-17T06:08:33.665276",{"slug":957,"name":957,"fn":958,"description":959,"org":960,"tags":961,"stars":941,"repoUrl":942,"updatedAt":967},"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},[962,963,964],{"name":933,"slug":934,"type":15},{"name":939,"slug":940,"type":15},{"name":965,"slug":966,"type":15},"Navigation","navigation","2026-07-26T05:47:42.378419",{"slug":969,"name":969,"fn":970,"description":971,"org":972,"tags":973,"stars":941,"repoUrl":942,"updatedAt":982},"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},[974,977,978,979],{"name":975,"slug":976,"type":15},"API Development","api-development",{"name":936,"slug":937,"type":15},{"name":939,"slug":940,"type":15},{"name":980,"slug":981,"type":15},"Web Scraping","web-scraping","2026-07-20T06:24:11.928835",{"slug":984,"name":984,"fn":985,"description":986,"org":987,"tags":988,"stars":941,"repoUrl":942,"updatedAt":997},"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},[989,990,991,994],{"name":939,"slug":940,"type":15},{"name":23,"slug":24,"type":15},{"name":992,"slug":993,"type":15},"QA","qa",{"name":995,"slug":996,"type":15},"Testing","testing","2026-07-17T06:07:41.421482",{"slug":999,"name":999,"fn":1000,"description":1001,"org":1002,"tags":1003,"stars":941,"repoUrl":942,"updatedAt":1009},"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},[1004,1005,1006],{"name":933,"slug":934,"type":15},{"name":939,"slug":940,"type":15},{"name":1007,"slug":1008,"type":15},"Desktop","desktop","2026-07-17T06:08:28.007783",{"slug":1011,"name":1011,"fn":1012,"description":1013,"org":1014,"tags":1015,"stars":941,"repoUrl":942,"updatedAt":1022},"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},[1016,1017,1020],{"name":939,"slug":940,"type":15},{"name":1018,"slug":1019,"type":15},"Messaging","messaging",{"name":1021,"slug":1011,"type":15},"Slack","2026-07-17T06:08:27.679015",{"slug":1024,"name":1024,"fn":1025,"description":1026,"org":1027,"tags":1028,"stars":941,"repoUrl":942,"updatedAt":1035},"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},[1029,1030,1031,1032],{"name":936,"slug":937,"type":15},{"name":939,"slug":940,"type":15},{"name":995,"slug":996,"type":15},{"name":1033,"slug":1034,"type":15},"Vercel","vercel","2026-07-17T06:08:28.349899",{"slug":1037,"name":1037,"fn":1038,"description":1039,"org":1040,"tags":1041,"stars":1046,"repoUrl":1047,"updatedAt":1048},"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},[1042,1045],{"name":1043,"slug":1044,"type":15},"Deployment","deployment",{"name":1033,"slug":1034,"type":15},28993,"https:\u002F\u002Fgithub.com\u002Fvercel-labs\u002Fagent-skills","2026-07-17T06:08:41.18374",{"slug":1050,"name":1050,"fn":1051,"description":1052,"org":1053,"tags":1054,"stars":1046,"repoUrl":1047,"updatedAt":1060},"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},[1055,1058,1059],{"name":1056,"slug":1057,"type":15},"CLI","cli",{"name":1043,"slug":1044,"type":15},{"name":1033,"slug":1034,"type":15},"2026-07-17T06:08:41.84179",{"slug":1062,"name":1062,"fn":1063,"description":1064,"org":1065,"tags":1066,"stars":1046,"repoUrl":1047,"updatedAt":1079},"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},[1067,1070,1073,1076],{"name":1068,"slug":1069,"type":15},"Best Practices","best-practices",{"name":1071,"slug":1072,"type":15},"Frontend","frontend",{"name":1074,"slug":1075,"type":15},"React","react",{"name":1077,"slug":1078,"type":15},"UI Components","ui-components","2026-07-17T06:05:40.576913",{"slug":1081,"name":1081,"fn":1082,"description":1083,"org":1084,"tags":1085,"stars":1046,"repoUrl":1047,"updatedAt":1094},"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},[1086,1089,1090,1093],{"name":1087,"slug":1088,"type":15},"Cost Optimization","cost-optimization",{"name":1043,"slug":1044,"type":15},{"name":1091,"slug":1092,"type":15},"Performance","performance",{"name":1033,"slug":1034,"type":15},"2026-07-17T06:04:08.327515",100,{"items":1097,"total":127},[1098],{"slug":4,"name":4,"fn":5,"description":6,"org":1099,"tags":1100,"stars":25,"repoUrl":26,"updatedAt":27},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1101,1102,1103,1104],{"name":23,"slug":24,"type":15},{"name":20,"slug":21,"type":15},{"name":13,"slug":14,"type":15},{"name":17,"slug":18,"type":15}]