Description
portless is an agent skill from the vercel-labs portless project for setting up named local development URLs. Instead of addresses like localhost:3000, your app gets a stable name such as https://myapp.localhost, which removes many common problems. The skill lists the problems portless addresses: port conflicts when two projects default to the same port, the difficulty of remembering which app runs on which port, stale tabs that show the wrong app after a server restarts on the same port, and monorepos where every issue scales with each service. It also covers AI agents testing the wrong port, cookies and localStorage clashing between apps on localhost, and hardcoded ports in CORS allowlists, OAuth redirects and .env files that break when ports change. Sharing a stable URL with teammates is easier than explaining a port number. The skill's installation guidance recommends installing portless globally, and it advises against npx or pnpm dlx for one-off runs. It is listed on skills.sh, where the page shows install counts, GitHub stars and security audit results. Install it with npx skills add https://github.com/vercel-labs/portless --skill portless.…
Highlights
- Named .localhost URLs for dev servers
- Fixes port conflicts and stale tabs
- Helps monorepos and AI agents hit the right port
- Keeps cookies and storage apart between apps
- Recommends a global install
- Installs from skills.sh
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portless FAQ
What does portless do?
It replaces port numbers with stable, named .localhost URLs, such as https://myapp.localhost, for local dev servers.
Which problems does it solve?
Port conflicts, remembering which app uses which port, stale tabs after a restart, cookie and storage clashes, hardcoded ports, and AI agents testing the wrong port.
How should I install it?
The skill recommends a global install, and says not to use npx or pnpm dlx for one-off execution.
How do I install the skill?
Run npx skills add https://github.com/vercel-labs/portless --skill portless.
What are the security audit results?
skills.sh lists three audits: Gen Agent Trust Hub Pass, Socket Pass and Snyk Pass.
How popular is it?
The page shows about 5.9K installs, and the portless repository has 12.7K GitHub stars.
What are the best portless alternatives?
Popular alternatives to portless include agent-browser, hyperframes and ponytail. See all portless alternatives