How do I install reins?

Run these in Claude Code: npx -y skills add karnstack/reins. Then prompt normally.

Does reins auto-invoke its skills?

Not yet. It is indexed on Flowy as a plain plugin. Request auto-invocation on its page and Flowy will route its skills for you as you prompt.

Yes. Flowy is free and open source, with nothing gated. You can read every skill in full before you install.

Automation

reins

Take the reins of your real browser

FLOW.md

karnstack@karnstack

GitHub

Plugin Signal56/100Fair

terminal

$ npx -y skills add karnstack/reins --agent claude-code

Stats

TypeScript Node Bash GitHub Playwright

What's inside

Skills

/reinsDrive the user's real, logged-in browser from the shell via the reins CLI. Because it's their actual browser, every site is already authenticated — so you can scrape behind logins, read cookies/tokens/localStorage, watch and replay live API traffic, call a site's own API as the

FAQ

reins is a Claude Code plugin with 1 hand-picked skill for automation work, indexed on Flowy. Install it with the command on its page. It includes reins. Its skills do not fire on their own yet. Request auto-invocation to have Flowy route them as you prompt. Free and open source.

What is reins?: Take the reins of your real browser
How do I install reins?: Run these in Claude Code: npx -y skills add karnstack/reins. Then prompt normally.
Does reins auto-invoke its skills?: Not yet. It is indexed on Flowy as a plain plugin. Request auto-invocation on its page and Flowy will route its skills for you as you prompt.
Is reins free?: Yes. Flowy is free and open source, with nothing gated. You can read every skill in full before you install.

Flowy

Quick start

npm i -g @karnstack/reins # the CLI (daemon included, starts on demand) npx skills add karnstack/reins # the skill, into your agent(s) of choice

Then install the extension in every Chromium browser you want agents to reach — Chrome, Brave, Edge, Arc, Dia:

Add reins from the Chrome Web Store — it finds the local daemon and connects on its own.

No store access? reins extension installs it via Load unpacked instead — see docs/SIDELOAD.md. That's the whole setup; reins status shows what's connected.

The loop

reins snapshot # list interactive elements with refs → e5: button "Submit" reins click --ref e5 # act by ref reins text # verify (or: reins screenshot → prints an image path)

Every command takes --tab <id> (default: active tab), --browser <id> (only when several are connected), and --json. reins help is self-describing; reins cdp is the escape hatch to the full Chrome DevTools Protocol.

Learn more

The full story lives on the site:

Docs — getting started, architecture, and the complete command reference

How it compares — vs agent-browser, dev3000, and playwright-mcp

Security — per-site permissions, 127.0.0.1-only binding, and the threat model

Site permissions — the deny / read / full tiers and how to tighten them

Develop

mise install # Node 24.18.0 + pnpm 11.9.0 (exact, via mise) pnpm install pnpm dev # watch-build all packages (extension → dist/) pnpm test # protocol + cli + extension unit/integration tests pnpm lint && pnpm typecheck && pnpm build pnpm reins tabs # build + run any CLI command

Local walkthrough (load unpacked, allow the dev ID, drive tabs): docs/RUNNING.md. Releasing: docs/RELEASING.md.

Packages: protocol (shared zod frames), cli (@karnstack/reins, bin reins), extension (MV3), web (reins.tech), and skills/reins (the agent skill).

.changeset/ audit-log.md config.json README.md .github/ assets/ browser-dark.png browser-light.png workflows/ ci.yml release.yml .gitignore .npmrc biome.json docs/ CHROME_WEB_STORE.md PRIVACY.md RELEASING.md ROADMAP.md RUNNING.md SECURITY.md SIDELOAD.md superpowers/ plans/ 2026-07-11-audit-log.md 2026-07-11-permission-model.md specs/ 2026-07-04-reins-cli-skill-design.md 2026-07-06-sideload-install-design.md 2026-07-11-audit-log-design.md 2026-07-11-permission-model-design.md LICENSE mise.toml package.json packages/ cli/ CHANGELOG.md LICENSE package.json README.md scripts/ bundle-extension.mjs sideload-key.json src/ allowlist.test.ts allowlist.ts args.test.ts args.ts audit-cli.test.ts audit-cli.ts audit.test.ts audit.ts bridge.test.ts bridge.ts cli-commands.test.ts cli-commands.ts cli.ts commands.test.ts commands.ts config.test.ts config.ts daemon.test.ts daemon.ts ensure.test.ts ensure.ts integration.test.ts log.test.ts log.ts policy-cli.test.ts policy-cli.ts rpc.test.ts rpc.ts serve.ts sideload.test.ts sideload.ts version.ts tsconfig.json tsdown.config.ts extension/ CHANGELOG.md icons/ icon-128.png icon-16.png icon-32.png icon-48.png icon.svg manifest.config.ts package.json scripts/ generate-icons.mjs zip.mjs src/ background.ts css.d.ts lib/ backoff.test.ts backoff.ts bridge-client.test.ts bridge-client.ts cdp.test.ts cdp.ts dispatch.test.ts dispatch.ts event-filter.test.ts event-filter.ts keys.test.ts keys.ts monitor.test.ts monitor.ts page-actions.test.ts page-actions.ts policy-view.test.ts policy-view.ts policy.test.ts policy.ts ring-buffer.test.ts ring-buffer.ts settings.test.ts settings.ts status.test.ts status.ts tab-handler.test.ts tab-handler.ts offscreen.html offscreen.ts popup.css popup.html popup.ts store-assets/ generate.py marquee-1400x560.png screenshot-1280x800.png small-tile-440x280.png tsconfig.json vite.config.ts vitest.config.ts protocol/ package.json src/ bridge.test.ts bridge.ts cdp.test.ts cdp.ts frames.test.ts frames.ts index.ts policy.test.ts policy.ts ports.test.ts ports.ts tsconfig.json tsdown.config.ts web/ components.json package.json public/ 404.html favicon.png favicon.svg llms.txt og.png robots.txt sitemap.xml src/ components/ animated-terminal.tsx code-block.tsx command-menu.tsx copy-command.tsx copy-markdown.tsx docs-toc.tsx hero.tsx icons.tsx ideas-section.tsx logo.tsx popup-mock.tsx release-list.tsx reveal.tsx site-footer.tsx site-header.tsx terminal.tsx theme-toggle.tsx ui/ accordion.tsx button.tsx command.tsx sheet.tsx lib/ changelog.ts dom-to-markdown.ts highlight.ts motion.ts pagefind.ts seo.ts site.ts use-copy.ts use-github-stars.ts utils.ts router.tsx routes/ __root.tsx changelog/ extension.tsx index.tsx route.tsx docs/ architecture.tsx commands.tsx comparison.tsx faq.tsx index.tsx permissions.tsx route.tsx security.tsx sideload.tsx index.tsx privacy.tsx routeTree.gen.ts styles.css vite-env.d.ts tsconfig.json vite.config.ts worker/ index.ts wrangler.jsonc pnpm-lock.yaml pnpm-workspace.yaml README.md skills/ reins/ SKILL.md tsconfig.base.json turbo.json

reins

Skills

reins

Skills

README

Quick start

The loop

Learn more

Develop

License

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