---
title: "AI Catalog defined | Agent Ready Checklist"
description: "AI Catalog: JSON file at /.well-known/ai-catalog.json listing every agent-facing resource a site ships. AR-FIND-04 (MAY). Uses the ARD data model."
canonical: https://agentreadychecklist.com/glossary/ai-catalog
site: "Agent Ready Checklist"
last_updated: 2026-11-05
section: "Glossary"
---

# AI Catalog defined | Agent Ready Checklist

> AI Catalog: JSON file at /.well-known/ai-catalog.json listing every agent-facing resource a site ships. AR-FIND-04 (MAY). Uses the ARD data model.

Source: https://agentreadychecklist.com/glossary/ai-catalog
Site: Agent Ready Checklist
Last reviewed: 2026-11-05
Agent endpoints: https://agentreadychecklist.com/llms.txt (index), https://agentreadychecklist.com/openapi.json (API), https://agentreadychecklist.com/mcp (MCP server), https://agentreadychecklist.com/ask (search)
Access: https://agentreadychecklist.com/auth.md (no key). Pricing: https://agentreadychecklist.com/pricing.md (free).

# AI Catalog

JSON file at /.well-known/ai-catalog.json listing every agent-facing resource a site ships. AR-FIND-04 (MAY). Uses the ARD data model. Example: {"specVersion":"1.0","entries":\[{"identifier":"urn:air:example.com:server:docs","displayName":"Docs MCP","type":"application/mcp-server-card+json","url":"https://example.com/.well-known/mcp/server-card.json"}\]}. Related row: AR-FIND-04 (AI Catalog at .well-known). Cloudflare's scanner wants HTTP 200, Content-Type application/json and Access-Control-Allow-Origin: \*. The Verify Kit check ai-catalog tests AI Catalog.

## Definition

JSON file at /.well-known/ai-catalog.json listing every agent-facing resource a site ships. AR-FIND-04 (MAY). Uses the ARD data model.

## Example

```json
{"specVersion":"1.0","entries":[{"identifier":"urn:air:example.com:server:docs","displayName":"Docs MCP","type":"application/mcp-server-card+json","url":"https://example.com/.well-known/mcp/server-card.json"}]}
```

## Where it appears on the checklist

-   [AR-FIND-04](https://agentreadychecklist.com/checklist/ar-find-04/)AI Catalog at .well-known: Publish an AI Catalog at /.well-known/ai-catalog.json listing every agent-facing resource (MCP server card, OpenAPI, A2A card, docs, llms.txt, skills), linked with <link rel="ai-catalog"> and an HTTP Link header.

## Asked about it

### What is the difference between the AI Catalog and the API catalog?

The AI Catalog (AR-FIND-04) at /.well-known/ai-catalog.json lists every agent resource, MCP cards and skills included. The API catalog (RFC 9727) at /.well-known/api-catalog lists APIs with links to OpenAPI and docs.

## Sources

-   [isitagentready.com/.well-known/agent-skills/ard/SKILL.md](https://isitagentready.com/.well-known/agent-skills/ard/SKILL.md)read 2026-11-04

Last reviewed 2026-11-05. AgentReady v2.0, read 2026-11-04.