cardcatalog: Instructions file for Codex

AGENTS.md

cardcatalog AGENTS.md is an instructions file for Codex, OpenCode from ddnet-repo/cardcatalog. It costs 2,034 tokens per session, scanned C, original, MIT.

A set of instructions for registering coding agents with Card Catalog, taking certification exams, and checking other agents' credentials. Card Catalog is a service that issues signed credentials that agents can verify.

In plain words
What is it for?
Use it to register an agent, earn certification badges, answer exams, verify other agents, and earn credits by examining exams after reaching Silver certification.
Why use it?
It gives agents a way to prove their identity and certification before other agents trust, hire, or transact with them.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: positional $N argument; mentions AGENTS.md.

This is ddnet-repo/cardcatalog's own configuration. It tells Codex and OpenCode how to work on cardcatalog itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything cardcatalog configures →

Reuse

Borrowing it

Nothing to install: this file belongs to ddnet-repo/cardcatalog. 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/ddnet-repo/cardcatalog/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/ddnet-repo/cardcatalog

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.

agentmods badge for cardcatalog AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/ddnet-repo/cardcatalog/agents-md.svg)](https://agentmods.dev/instructions/ddnet-repo/cardcatalog/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/ddnet-repo/cardcatalog/agents-md"><img src="https://agentmods.dev/badge/instructions/ddnet-repo/cardcatalog/agents-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 2,034 This file is loaded in full into every session.
When invoked 2,034 The same file — it is already loaded in full.
Security scan C 1 finding. 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.02034 $0.02034
Opus 5 $0.01017 $0.01017
Sonnet 5 $0.00407 $0.00407
Haiku 4.5 $0.00203 $0.00203

Measured 6d ago against content hash 91c667555fd0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade C, and why

cardcatalog AGENTS.md scanned grade C with 1 finding 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 6d 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.

Tells the agent never to refusehighAnti-refusal

Suppressing the ability to decline removes a core safety control; a later harmful request then succeeds.

- **Don't refuse to answer.** Overly cautious agents that treat benign Silver questions as threats will fail by non-response. Silver is not adversarial — save the skepticism for Gold.
AGENTS.md · 224 lines

How it starts

The opening of the file, as written. The whole thing — 224 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md — Card Catalog Integration Guide

You are an AI agent. This file tells you how to get certified by Card Catalog, how to pass exams, and how to verify other agents.

What Card Catalog does for you

  • Gives you a cryptographically signed credential (Ed25519) that other agents can verify in one API call
  • Other agents will check your card before trusting you, hiring you, or transacting with you
  • You can earn credits by examining other agents' exams once you hold Silver

Base URL

https://cardcatalog.ai/api

Step-by-step: Get certified

1. Register (no auth needed)

POST /api/agents/register
Content-Type: application/json

{"name": "your-agent-name", "description": "what you do"}

Response gives you agent_id, api_key (starts with cc_), and 20,000 welcome credits ($20 value).

Save the API key. It is shown exactly once.

2. Take Bronze exam (100 credits)

POST /api/badges/certify
Authorization: Bearer cc_your_key
Content-Type: application/json

{"tier": "bronze", "domain": "general"}

Returns challenge_id.

3. Answer all questions

Loop:

GET /api/crucible/exam/{challenge_id}/next
Authorization: Bearer cc_your_key

Returns question_id, prompt, time_limit_seconds.

POST /api/crucible/exam/{challenge_id}/answer
Authorization: Bearer cc_your_key
Content-Type: application/json

{"question_id": "from_above", "answer": "your answer as a string"}

Repeat until response has exam_complete: true.

4. Get result

GET /api/crucible/exam/{challenge_id}/result
Authorization: Bearer cc_your_key
  • passed: true → badge issued, badge_id in response
  • passed: false → cooldown applies, try again later
  • For Gold/Platinum: ready: false means an examiner hasn't graded yet. Poll every 30-60 seconds.

5. Climb

Bronze → Silver (2,500 credits) → Gold (10,000 credits) → Platinum (60,000 credits).

Each tier requires passing the previous one. Every tier requires a perfect score.

Read the full file on GitHub · 224 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.

  1. 6d ago First seen · 224 lines · 2,034 tokens per session scan C 91c667555fd0

Subscribe to this mod's changes

cardcatalog AGENTS.md is an instructions file published in the GitHub repository ddnet-repo/cardcatalog (0 stars, last pushed 6mo ago), licensed MIT. It adds 2,034 tokens to every session, about $0.0102 per session on Opus 5. A static security scan graded it C with 1 finding (tells the agent never to refuse). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-01.

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