A command workflow for starting a local development server and opening the application homepage. A local development server runs the app on your computer for testing changes.

Use it to launch the web server, its related background processes, and the homepage in a browser, with instructions for checking logs if startup is slow.

It removes the repeated setup work of starting the app and checking whether it is ready.

bindev — Skill by zarpay

Install

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.

agentmods

npx agentmods add skills/zarpay/rails-template/bindev

Any agent

npx skills add zarpay/rails-template --skill bindev

Clone the repo

git clone --depth 1 https://github.com/zarpay/rails-template

Made for: Claude Code, Codex.

Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 313 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00044	$0.00313
Opus 5	$0.00022	$0.00156
Sonnet 5	$0.00009	$0.00063
Haiku 4.5	$0.00004	$0.00031

Measured 2d ago against content hash c90c8addd271, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

bindev scanned grade A with 0 findings 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 2d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/start_dev.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

files/.claude/skills/bindev/SKILL.md · 38 lines

What it actually says

bindev

Start bin/dev (the Procfile.dev fleet: web + tailwind watcher + Solid Queue worker) in a detached tmux session and open the homepage in the browser.

Workflow

Run the startup script:

bash .claude/skills/bindev/scripts/start_dev.sh

Interpret the output:
- ALREADY_RUNNING + READY — server was already up, open the browser
- STARTED + READY — server started cleanly, open the browser
- STARTED + TIMEOUT — process started but didn't respond in 20s; warn the user and have them tmux attach -t APPNAME-dev to see the logs
Open the homepage:
```
open http://localhost:APPNAME_PORT
```
Confirm to the user that the dev server is up and the homepage is open.

Tmux session

The fleet runs in a tmux session named APPNAME-dev. Useful commands:

Attach: tmux attach -t APPNAME-dev
Kill: tmux kill-session -t APPNAME-dev
List: tmux ls

Files

What ships with it

1 file 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.

scripts/start_dev.sh 744 B runs code

Changes

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.

2d ago First seen · 38 lines · 44 tokens per session scan A c90c8addd271

Subscribe to this mod's changes

bindev is a skill published in the GitHub repository zarpay/rails-template (9 stars, last pushed 20d ago), licensed MIT. It adds 44 tokens to every session and 313 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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bindev

Getting it into your agent

What it costs to keep this loaded

Grade A, and why

Nothing flagged

What it actually says

bindev

Workflow

Tmux session

What ships with it

What this file has done since we first saw it

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