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.
git clone --depth 1 https://github.com/ItamarZand88/awesome-agent-conventionsWrote 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/rules/itamarzand88/awesome-agent-conventions/rails-cursorrules-prompt-file)<a href="https://agentmods.dev/rules/itamarzand88/awesome-agent-conventions/rails-cursorrules-prompt-file"><img src="https://agentmods.dev/badge/rules/itamarzand88/awesome-agent-conventions/rails-cursorrules-prompt-file/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/rules/itamarzand88/awesome-agent-conventions/rails-cursorrules-prompt-file"><img src="https://agentmods.dev/badge/rules/itamarzand88/awesome-agent-conventions/rails-cursorrules-prompt-file.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 | $0.00190 | $0.00190 |
| Opus 5 | $0.00095 | $0.00095 |
| Sonnet 5 | $0.00038 | $0.00038 |
| Haiku 4.5 | $0.00019 | $0.00019 |
Grade A, and why
rails-cursorrules-prompt-file 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 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.
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.
This is a copy
91% identical to rails-cursorrules-prompt-file — 1 line differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
description: "Cursor rules for Rails development with basic setup." globs: */ alwaysApply: false
Rails 8 Development Guidelines
- Prefer Rails command-line generators over hand-written boilerplate.
- Use
bin/devfor local development and check logs after significant changes. - Follow Rails 8 conventions for Solid Queue, Solid Cache, Solid Cable, Propshaft, and Kamal where appropriate.
- Keep controllers RESTful and focused; use service objects for complex business logic.
- Use PostgreSQL, proper indexes, connection pooling, and safe migrations.
- Write Minitest coverage for models, controllers, and integration flows.
- Use Hotwire for standard Rails interactivity and Vite only when npm-managed JavaScript is needed.
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 · 16 lines · 190 tokens per session scan A 81e618729d7c
rails-cursorrules-prompt-file is a cursor rule published in the GitHub repository ItamarZand88/awesome-agent-conventions (31 stars, last pushed 1mo ago), licensed MIT. It adds 190 tokens to every session, about $0.0010 per session on Opus 5. A static security scan graded it A with 0 findings. It is 91% identical to rails-cursorrules-prompt-file, differing in 1 line, and is treated as a copy.
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