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-hero-imagesgit 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 | $0.01410 |
| Opus 5 | $0.00000 | $0.00705 |
| Sonnet 5 | $0.00000 | $0.00282 |
| Haiku 4.5 | $0.00000 | $0.00141 |
Grade A, and why
chapter-hero-images 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.
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 — 199 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Hero Image Generation for Tutorial Chapters
When creating or editing tutorial chapter files, always include a hero image at the top of the content.
Hero Image Requirements
Every chapter MUST have a hero image placed immediately after the frontmatter and before the main heading.
Placement Format
---
title: "NN: Chapter Title"
description: "Chapter description"
series: "series-slug"
chapter: N
order: N
difficulty: "Beginner|Intermediate|Advanced"
prerequisites: []
---
# Chapter NN: Chapter Title
## Overview
...
Generating Hero Images
Using the MCP Imagen Tool
When creating a new chapter, generate the hero image using the mcp_imagen_generate_image tool:
mcp_imagen_generate_image({
prompt:
"Contextual description based on chapter topic, technical illustration",
series: "php-basics" | "ai-ml-php-developers",
chapter: "00" | "01" | "15b", // Zero-padded chapter number
slug: "descriptive-slug-hero", // Kebab-case based on chapter title
creative_mode: false,
sizes: ["full", "thumbnail"],
});
Prompt Generation Guidelines
Create prompts based on the chapter topic:
PHP Basics Examples:
- Chapter 00 (Environment Setup): "PHP development environment setup with code editor and terminal, technical illustration, computer workspace"
- Chapter 02 (Variables): "Variables and data types symbols, programming variables visualization, technical illustration"
- Chapter 08 (OOP): "Object-oriented programming PHP classes and objects, OOP concepts diagram, technical illustration"
- Chapter 14 (Databases): "Database connection with PDO PHP, database tables and SQL queries, technical illustration"
AI/ML Examples:
- Chapter 01 (AI Intro): "Artificial intelligence and machine learning concepts, AI technology visualization, technical illustration"
- Chapter 05 (Linear Regression): "Linear regression model graph, first ML model visualization, technical illustration"
- Chapter 13 (NLP): "Natural language processing text analysis, NLP word clouds and text, technical illustration"
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 · 199 lines · 0 tokens per session scan A 68033c840e5d
chapter-hero-images 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 1,410 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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