What is ai-development-patterns CLAUDE.md?

A codebase guide for a repository of software development patterns organized by experience level and by stages such as foundation, development, and operations.

Use it when adding or updating patterns, checking repository conventions, running validation, or reviewing machine-verified adoption evidence.

It shows agents where to find patterns, examples, experiments, documentation, automation scripts, tests, and verification records.

How PaulDuvall/ai-development-patterns configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to PaulDuvall/ai-development-patterns. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/PaulDuvall/ai-development-patterns/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/PaulDuvall/ai-development-patterns

Made for: Claude Code.

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/instructions/paulduvall/ai-development-patterns/claude-md/github.svg)](https://agentmods.dev/instructions/paulduvall/ai-development-patterns/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/paulduvall/ai-development-patterns/claude-md"><img src="https://agentmods.dev/badge/instructions/paulduvall/ai-development-patterns/claude-md/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/paulduvall/ai-development-patterns/claude-md"><img src="https://agentmods.dev/badge/instructions/paulduvall/ai-development-patterns/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,361 This file is loaded in full into every session.

When invoked 1,361 The same file — it is already loaded in full.

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	$0.01361	$0.01361
Opus 5.5	$0.00544	$0.00544
Sonnet 5.5	$0.00272	$0.00272
Haiku 4.5	$0.00136	$0.00136

Measured 2mo ago against content hash fe9867f87d9a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ai-development-patterns CLAUDE.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 2mo 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.

CLAUDE.md · 112 lines

How it starts

The opening of the file, as written. The whole thing — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Repository Overview

This is the AI Development Patterns repository - a comprehensive collection of patterns for building software with AI assistance. The patterns are organized by implementation maturity (Beginner/Intermediate/Advanced) and development lifecycle phases (Foundation → Development → Operations).

Repository Structure

├── README.md                    # Main pattern documentation
├── pattern-spec.md              # Pattern creation specification and formatting rules
├── PATTERN_MIGRATION_GUIDE.md   # Naming/anchor migration reference (historical + mapping)
├── index.html                   # GitHub Pages landing page
├── docs/                        # Additional documentation
├── examples/                    # Working implementations of stable patterns
├── experiments/                 # Experimental patterns + examples
├── scripts/                     # Repo automation scripts (validation, updates)
├── tests/                       # Pytest-based validation suite
├── verification/                # Machine-verified pattern adoption evidence (see verification/README.md)
└── .github/                     # GitHub Actions workflows

Key Architectural Principles

Pattern Architecture

Three-tier organization: Foundation → Development → Operations patterns
Dependency-driven: Patterns have explicit dependencies shown in the reference table
Maturity-based progression: Beginner patterns enable Intermediate, which enable Advanced
Anti-pattern inclusion: Every pattern includes what NOT to do with specific examples

Pattern Reference System

Hyperlinked navigation: Every pattern reference must link to its section using #pattern-name-in-lowercase-with-hyphens
Comprehensive reference table: See "Complete Pattern Reference" in README.md
Related patterns: Each pattern explicitly lists dependencies and related patterns

Read the full file on GitHub · 112 lines

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.

2mo ago First seen · 112 lines · 1,361 tokens per session scan A fe9867f87d9a

Subscribe to this mod's changes

ai-development-patterns CLAUDE.md is an instructions file published in the GitHub repository PaulDuvall/ai-development-patterns (673 stars, last pushed 4d ago), licensed MIT. It adds 1,361 tokens to every session, about $0.0054 per session on Opus 5.5. 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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ai-development-patterns CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
ai-development-patterns CLAUDE.mdPaulDuvall/ai-development-patterns	Instructions file	673	4d ago	MIT	A	1,361	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

ai-development-patterns: Instructions file for Claude Code