visual-development

A visual development workflow for Rails applications that uses system tests and screenshots. Rails is a Ruby framework for building web applications.

In plain words
What is it for?
Use it to develop and check Rails interfaces with system tests and captured screenshots.
Why use it?
It helps developers inspect the visible result of changes instead of relying only on code or automated test output.

Command

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 commands/verygoodplugins/ai-editor-rules/visual-development
Clone the repo
git clone --depth 1 https://github.com/verygoodplugins/ai-editor-rules
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,678 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.02678
Opus 5 $0.00000 $0.01339
Sonnet 5 $0.00000 $0.00536
Haiku 4.5 $0.00000 $0.00268

Measured yesterday against content hash 412aa8d5a28b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

visual-development 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 yesterday.

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.

claude-code/rails/commands/visual-development.md · 299 lines

The source is not reproduced here

Licensed GPL-3.0

The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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.

  1. yesterday First seen · 299 lines · 0 tokens per session scan A 412aa8d5a28b

Subscribe to this mod's changes

visual-development is a command published in the GitHub repository verygoodplugins/ai-editor-rules (2 stars, last pushed 1y ago), licensed GPL-3.0. It costs nothing until one of its globs matches a file; then it loads 2,678 tokens. 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.