A reference for CodeIgniter 4, a PHP framework for building web applications using routes, controllers, models, views, and databases.

It supports routing, controllers, database queries, models, views, filters, migrations, command-line tasks, and authentication with Shield.

It helps avoid confusing CodeIgniter 4 with other PHP frameworks and gives project work a consistent reference for its documented patterns.

ci4 — Skill for Claude Code and Codex by enlivenapp

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.

Any agent

npx skills add enlivenapp/Codeigniter4-App-and-API-Skills-for-Claude-Code --skill ci4

Clone the repo

git clone --depth 1 https://github.com/enlivenapp/Codeigniter4-App-and-API-Skills-for-Claude-Code

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/enlivenapp/codeigniter4-app-and-api-skills-for-claude-code/ci4.svg)](https://agentmods.dev/skills/enlivenapp/codeigniter4-app-and-api-skills-for-claude-code/ci4)

Your own site

<a href="https://agentmods.dev/skills/enlivenapp/codeigniter4-app-and-api-skills-for-claude-code/ci4"><img src="https://agentmods.dev/badge/skills/enlivenapp/codeigniter4-app-and-api-skills-for-claude-code/ci4.svg" alt="Measured on agentmods" height="20"></a>

Per session 88 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,763 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original 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.

Model	Per session	Once invoked
Fable 5.1	$0.00088	$0.02763
Opus 5	$0.00044	$0.01381
Sonnet 5	$0.00018	$0.00553
Haiku 4.5	$0.00009	$0.00276

Measured 8d ago against content hash ea37ce872736, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

ci4 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 8d 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.

ci4/SKILL.md · 358 lines

How it starts

The opening of the file, as written. The whole thing — 358 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CodeIgniter 4 — Framework Reference

CodeIgniter 4 is a full-stack PHP 8+ MVC framework. It is not Laravel. Do not apply Laravel APIs, method names, or conventions here. When in doubt, check this skill and its references — not memory of another framework.

Related skills: ci4-api for REST API patterns, ci4-shield for authentication/authorization.

Reference Documents

For deep dives, read the relevant reference from references/:

Reference	When to read
`references/routing.md`	Route groups, placeholders, named routes, resource routes
`references/controllers.md`	ResourceController, request data, validation, redirects, flash data
`references/models.md`	CRUD, soft deletes, timestamps, validation, pagination, scopes, callbacks, entities
`references/query-builder.md`	SELECT, WHERE, JOIN, GROUP BY, batch ops, subqueries, transactions, debugging
`references/views.md`	Layouts, sections, partials, escaping, view cells
`references/filters.md`	Creating, registering, applying, global filters, filter arguments
`references/database.md`	Migrations, seeds, forge, field types, adding/dropping columns
`references/validation.md`	All validation rules, custom rules, file upload validation
`references/services-helpers.md`	Services, helpers, caching, email, sessions, encryption
`references/spark-cli.md`	All spark commands, generators, custom commands
`references/testing.md`	PHPUnit, feature tests, database tests, mocking
`references/gotchas.md`	Critical pitfalls, CI4 vs Laravel comparison table

Directory Structure

app/
  Config/         # All configuration classes (Routes, Database, Filters, Auth, etc.)
  Controllers/    # HTTP controllers
  Database/
    Migrations/   # Migration files (timestamped)
    Seeds/        # Seeder classes
  Filters/        # Before/after request filters
  Libraries/      # Custom libraries
  Models/         # Model classes
  Services/       # Custom service classes
  Views/          # View templates (.php)
    layouts/      # Layout templates
    partials/     # Reusable partials
public/           # Web root — index.php entry point lives here
writable/         # Cache, logs, sessions (must be writable)
tests/
vendor/
.env              # Environment config (copy from `env`)
spark             # CLI entry point

Read the full file on GitHub · 358 lines

Files

What ships with it

12 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

8d ago First seen · 358 lines · 88 tokens per session scan A ea37ce872736

Subscribe to this mod's changes

ci4 is a skill published in the GitHub repository enlivenapp/Codeigniter4-App-and-API-Skills-for-Claude-Code (22 stars, last pushed 4mo ago), licensed MIT. It adds 88 tokens to every session and 2,763 once invoked, about $0.0004 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 2026-08-30.

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