What is contentful.php AGENTS.md?

A repository guide for coding agents working on the Contentful PHP library. It points to the files that explain the code structure, development process, decisions, and review rules.

Use it to find architecture and testing instructions, understand integration points, and avoid breaking namespace, client, link-resolution, or compatibility rules.

It reduces guesswork before making changes and highlights rules that could otherwise cause broken APIs or unsafe behavior.

How contentful/contentful.php configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to contentful/contentful.php. 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/contentful/contentful.php/master/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/contentful/contentful.php

Made for: Codex, OpenCode.

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/contentful/contentful.php/agents-md/github.svg)](https://agentmods.dev/instructions/contentful/contentful.php/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/contentful/contentful.php/agents-md"><img src="https://agentmods.dev/badge/instructions/contentful/contentful.php/agents-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/contentful/contentful.php/agents-md"><img src="https://agentmods.dev/badge/instructions/contentful/contentful.php/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,176 This file is loaded in full into every session.

When invoked 1,176 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	$0.01176	$0.01176
Opus 5.5	$0.00470	$0.00470
Sonnet 5.5	$0.00235	$0.00235
Haiku 4.5	$0.00118	$0.00118

Measured 2mo ago against content hash 9b20ee1e0642, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

contentful.php 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 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.

AGENTS.md · 68 lines

How it starts

The opening of the file, as written. The whole thing — 68 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent Guide

Read this file first. It tells you where to find context in this repo.

Quick Reference

What you need	Where to look
How this repo is structured	ARCHITECTURE.md
How to build/test/run	CONTRIBUTING.md
Why decisions were made	docs/ADRs/
What this repo does	README.md
PR review rules	.bito/guidelines/
Active specs/work	docs/specs/

Sharp Edges & Invariants

Namespace is Contentful\Delivery\* — all public types live under this namespace. Do not add classes to Contentful\Core\* or any other namespace; cross-SDK concerns belong in contentful/core.
One Client = one space + one environment. The space ID and environment ID are constructor arguments and immutable. There is no "multi-space client" — callers must instantiate multiple Client objects.
MAX_DEPTH = 20 — link resolution is recursive. Exceeding depth 20 throws. Do not raise this limit without understanding the memory implications on large entry graphs.
Backward compatibility is enforced by CI (roave/backward-compatibility-check). Any removal or signature change to a public API method is a breaking change requiring a major version bump. Even dropping a PHP version is a breaking change (major bump required).
ResourcePool is the identity map — do not instantiate domain resources directly outside of mappers. Always go through ResourceBuilder::build() so the pool is correctly populated and duplicates are deduplicated.
php-vcr cassettes are fragile — the Contentful space used to record existing integration test cassettes no longer exists. Do not delete cassettes, but do not record new cassettes against the old space. New integration tests should mock at the HTTP layer directly or use a live test space. See ADR-0005.
PSR-6 cache keys are generated by the resource pool — do not construct or hard-code cache keys. Always call ResourcePool::generateKey().
Locale wildcard '*' is used internally when a resource is fetched without an explicit locale (meaning "all locales"). Never strip or override the locale to null when serializing to cache.
phpstan level 5 must pass. There is a known warning about LocalizedResource::$sys undefined property on PHP 8.1 — it is intentionally left unresolved (fixing it breaks backward compat with PHP ≤ 8.1). Do not suppress it globally; see ADR-0004.
php-cs-fixer auto-fixes style — always run tools/php-cs-fixer/vendor/bin/php-cs-fixer fix -v before committing. CI will fail on unfixed style. The warning about running on a newer PHP version than the minimum supported is cosmetic and expected.

Read the full file on GitHub · 68 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 · 68 lines · 1,176 tokens per session scan A 9b20ee1e0642

Subscribe to this mod's changes

contentful.php AGENTS.md is an instructions file published in the GitHub repository contentful/contentful.php (119 stars, last pushed 7d ago), licensed MIT. It adds 1,176 tokens to every session, about $0.0047 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.

PHP contentful sdk

contentful.php AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
contentful.php AGENTS.mdcontentful/contentful.php	Instructions file	119	7d ago	MIT	A	1,176	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	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

contentful.php: Instructions file for Codex