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 agentmods add rules/dalehurley/codewithphp/chapter-validationgit clone --depth 1 https://github.com/dalehurley/codewithphpWhat 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 | $0.00000 | $0.02126 |
| Opus 5 | $0.00000 | $0.01063 |
| Sonnet 5 | $0.00000 | $0.00425 |
| Haiku 4.5 | $0.00000 | $0.00213 |
Grade A, and why
chapter-validation 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.
How it starts
The opening of the file, as written. The whole thing — 264 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Chapter Validation Checklist
This rule provides a systematic checklist for validating all tutorial chapters before publication. Every chapter in the /docs/series/*/chapters/ directory should pass these checks.
Frontmatter Validation
Every chapter MUST have complete and valid frontmatter:
- Title Format:
"NN: Chapter Title"(zero-padded chapter number + colon + title) - Description: Single sentence, present tense, no period at end
- Series: Matches the series directory name exactly
- Chapter Number: Matches the filename number (e.g.,
01-filename.mdhaschapter: 1) - Order: Usually matches chapter number (may differ for special chapters like
15b) - Difficulty: One of:
Beginner,Intermediate,Advanced - Prerequisites: Valid links to existing chapters (if applicable)
Example of valid frontmatter:
---
title: "01: Your First PHP Script"
description: "Write and execute your first PHP program"
series: "php-basics"
chapter: 1
order: 1
difficulty: "Beginner"
prerequisites: []
---
Content Structure Validation
-
Hero Image: Present after frontmatter, before main heading
- Format:
 - Image exists at
/docs/public/images/{series}/
- Format:
-
Main Heading: Single H1 heading matching title format
- Should be:
# NN: Chapter Title
- Should be:
-
Overview Section: 2-4 paragraphs explaining what will be learned
- States learning objectives clearly
- Connects to previous chapters
- Previews final outcome
-
Prerequisites Section: Lists requirements before starting
- Software versions specified
- Previous chapters linked
- Estimated Time: Included
-
What You'll Build: Bulleted deliverables
-
Objectives: 4-7 action-oriented learning goals
-
Step-by-Step Sections: Each step includes:
- Goal (one sentence)
- Actions (numbered list)
- Expected Result (code output or behavior)
- Why It Works (2-4 sentence explanation)
- Troubleshooting (2-3 common errors)
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.
- yesterday First seen · 264 lines · 0 tokens per session scan A d8ef0bdcd029
chapter-validation is a cursor rule published in the GitHub repository dalehurley/codewithphp (5 stars, last pushed 6mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 2,126 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.
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