Borrowing it
Nothing to install: this file belongs to davidteren/hotwire-codex-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/davidteren/hotwire-codex-skills/main/AGENTS.mdgit clone --depth 1 https://github.com/davidteren/hotwire-codex-skillsWrote 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/instructions/davidteren/hotwire-codex-skills/agents-md)<a href="https://agentmods.dev/instructions/davidteren/hotwire-codex-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/davidteren/hotwire-codex-skills/agents-md.svg" alt="Measured on agentmods" 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 | $0.01062 | $0.01062 |
| Opus 5 | $0.00531 | $0.00531 |
| Sonnet 5 | $0.00212 | $0.00212 |
| Haiku 4.5 | $0.00106 | $0.00106 |
Grade A, and why
hotwire-codex-skills AGENTS.md 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 7d 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.
How it starts
The opening of the file, as written. The whole thing — 83 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md — hotwire-codex-skills
A suite of Claude Code skills + tools for Rails + Hotwire apps that target web/PWA + iOS + Android. See README.md for the catalog.
Unofficial skillset inspired by The Rails and Hotwire Codex by Ayush Newatia, published with his permission. Not an official product of the book; reuses none of its text or source code.
What this is
Knowledge extracted from building the Piazza app (the Rails and Hotwire Codex
example) across three platforms, packaged as reusable skills. The companion app
repos hold the source + the code-grounded analysis notes this suite is distilled
from: piazza-web, piazza-ios, piazza-android (each has wip/analysis/).
How a skill is structured
skills/<name>/
SKILL.md # YAML frontmatter: name + description (the trigger). Then usage.
references/*.md # the contract/conventions reference (traceable to path:line)
templates/*.tmpl # code templates; placeholder tokens like __COMPONENT_NAME__
scripts/*.sh # runnable bash (generators + linters); 3 linters also need ruby
Conventions for adding/editing skills
- Ground every claim in real code. A reference statement should trace to a
path:linein one of the app repos. No invented APIs. - Scripts are plain bash (no deps beyond bash; 3 linters also require
ruby), and mustset -euo pipefail(or document why not). A generator must refuse to overwrite. A linter must exit non-zero on drift and name its ceiling (e.g. "heuristic scan, not a parser"). - Verify before shipping. Run a new linter against the real Piazza repos and
confirm it catches the known divergence (the
nav-menuicondrop) with no false positives. Test a generator end-to-end (dry-run + real-write + overwrite guard) before committing. - One built and verified beats five stubs. Build a new skill on demand from its source analysis note — don't scaffold empty dirs.
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.
- 7d ago First seen · 83 lines · 1,062 tokens per session scan A da42972dce69
hotwire-codex-skills AGENTS.md is an instructions file published in the GitHub repository davidteren/hotwire-codex-skills (3 stars, last pushed 2mo ago), licensed MIT. It adds 1,062 tokens to every session, about $0.0053 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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