MCPInstall

domain

by railwayapp

This skill should be used when the user wants to add a domain, generate a railway domain, check current domains, get the URL for a service, or remove a domain.

Installs
766
Last 24h
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Trending rank
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Security
Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/railwayapp/railway-skills --skill domain
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads domain automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Domain Management

Add, view, or remove domains for Railway services.

When to Use

  • User asks to "add a domain", "generate a domain", "get a URL"
  • User wants to add a custom domain
  • User asks "what's the URL for my service"
  • User wants to remove a domain

Add Railway Domain

Generate a railway-provided domain (max 1 per service):

railway domain --json

For a specific service:

railway domain --json --service backend

Response

Returns the generated domain URL. Service must have a deployment.

Add Custom Domain

railway domain example.com --json

Response

Returns required DNS records:

{
  "domain": "example.com",
  "dnsRecords": [
    { "type": "CNAME", "host": "@", "value": "..." }
  ]
}

Tell user to add these records to their DNS provider.

Read Current Domains

Use environment skill to see configured domains, or query directly:

query domains($envId: String!) {
  environment(id: $envId) {
    config(decryptVariables: false)
  }
}

Domains are in config.services.<serviceId>.networking:

  • serviceDomains - Railway-provided domains
  • customDomains - User-provided domains

Remove Domain

Use environment skill to remove domains:

Remove custom domain

{
  "services": {
    "<serviceId>": {
      "networking": {
        "customDomains": { "<domainId>": null }
      }
    }
  }
}

Remove railway domain

{
  "services": {
    "<serviceId>": {
      "networking": {
        "serviceDomains": { "<domainId>": null }
      }
    }
  }
}

Then use environment skill to apply and commit the change.

CLI Options

FlagDescription
[DOMAIN]Custom domain to add (omit for railway domain)
-p, --port <PORT>Port to connect
-s, --service <NAME>Target service (defaults to linked)
--jsonJSON output

Composability

  • Read domains: Use environment skill
  • Remove domains: Use environment skill
  • Apply removal: Use environment skill
  • Check service: Use service skill

Error Handling

No Service Linked

No service linked. Use --service flag or run `railway service` to select one.

Domain Already Exists

Service already has a railway-provided domain. Maximum 1 per service.

No Deployment

Service has no deployment. Deploy first with `railway up`.

Invalid Domain

Invalid domain format. Use a valid domain like "example.com" or "api.example.com".

FAQ

What does the domain skill do?

This skill should be used when the user wants to add a domain, generate a railway domain, check current domains, get the URL for a service, or remove a domain.

How do I install domain?

Run npx skills add https://github.com/railwayapp/railway-skills --skill domain in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/domain/ (personal) or .claude/skills/domain/ (project).

Which AI agents can use domain?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is domain safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains domain?

It is published by railwayapp in railwayapp/railway-skills. It has 766 recorded installs.

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