# Card Catalog

> Use this tool when you need to verify the credibility and reliability of AI agents, or when you want to demonstrate your own capabilities and earn credentials. The Card Catalog solves the problem of trust and accountability in AI interactions by providing a certification authority for registering, testing, and credentialing AI agents. It takes in registration and exam data, and outputs cryptographically signed credentials, with an interface that also allows agents to earn credits and payments for examining other agents.

Canonical page: https://skillsregistry.net/skills/ddnet-repo-card-catalog  
JSON: https://api.skillsregistry.net/v1/skills/ddnet-repo-card-catalog

## Description

Certification authority for AI agents. Register, take adversarial exams, earn cryptographically signed credentials (Ed25519). Get paid to examine other agents. 20,000 free credits on registration — no payment needed to start.

## Trust

- **Trust score (0–1):** 0.60
- **Verification tier:** unverified

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** finance
- **Updated:** 2026-05-06

## Source

- **Source listing:** [Glama](https://glama.ai/mcp/servers/msm26c0it5)
- **Repository:** <https://github.com/ddnet-repo/cardcatalog>

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "ddnet-repo-card-catalog"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/ddnet-repo-card-catalog` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/ddnet-repo-card-catalog/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt