Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add rocky2431/ultra-builder-pro --skill use-railwaygit clone --depth 1 https://github.com/rocky2431/ultra-builder-proWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/rocky2431/ultra-builder-pro/use-railway)<a href="https://agentmods.dev/skills/rocky2431/ultra-builder-pro/use-railway"><img src="https://agentmods.dev/badge/skills/rocky2431/ultra-builder-pro/use-railway/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/rocky2431/ultra-builder-pro/use-railway"><img src="https://agentmods.dev/badge/skills/rocky2431/ultra-builder-pro/use-railway.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00074 | $0.01447 |
| Opus 5 | $0.00037 | $0.00724 |
| Sonnet 5 | $0.00015 | $0.00289 |
| Haiku 4.5 | $0.00007 | $0.00145 |
Grade A, and why
use-railway scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
allowed-tools: Bash(railway:*), Bash(which:*), Bash(command:*), Bash(npm:*), Bash(npx:*), Bash(curl:*) How it starts
The opening of the file, as written. The whole thing — 125 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Use Railway
Railway resource model
Railway organizes infrastructure in a hierarchy:
- Workspace is the billing and team scope. A user belongs to one or more workspaces.
- Project is a collection of services under one workspace. It maps to one deployable unit of work.
- Environment is an isolated configuration plane inside a project (for example,
production,staging). Each environment has its own variables, config, and deployment history. - Service is a single deployable unit inside a project. It can be an app from a repo, a Docker image, or a managed database.
- Deployment is a point-in-time release of a service in an environment. It has build logs, runtime logs, and a status lifecycle.
Most CLI commands operate on the linked project/environment/service context. Use railway status --json to see the context, and --project, --environment, --service flags to override.
Preflight
Before any mutation, verify context:
command -v railway # CLI installed
railway whoami --json # authenticated
railway --version # check CLI version
railway status --json # linked project/environment/service
If the CLI is missing, guide the user to install it.
bash <(curl -fsSL cli.new) # Shell script (macOS, Linux, Windows via WSL)
brew install railway # Homebrew (macOS)
npm i -g @railway/cli # npm (macOS, Linux, Windows). Requires Node.js version 16 or higher.
If not authenticated, run railway login. If not linked, run railway link --project <id-or-name>.
If a command is not recognized (for example, railway environment edit), the CLI may be outdated. Upgrade with:
railway upgrade
Common quick operations
These are frequent enough to handle without loading a reference:
railway status --json # current context
railway whoami --json # auth and workspace info
railway project list --json # list projects
railway service status --all --json # all services in current context
railway variable list --service <svc> --json # list variables
railway variable set KEY=value --service <svc> # set a variable
railway logs --service <svc> --lines 200 --json # recent logs
railway up --detach -m "<summary>" # deploy current directory
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 125 lines · 74 tokens per session scan A 82cf3d7276ce
use-railway is a skill published in the GitHub repository rocky2431/ultra-builder-pro (11 stars, last pushed 1mo ago), licensed MIT. It adds 74 tokens to every session and 1,447 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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