---
title: "For AI agents: llms.txt, Markdown, JSON and an MCP server | agentcomposability.com"
url: https://agentcomposability.com/agents
description: "How AI agents can read agentcomposability.com: llms.txt, Markdown copies of every page, the compatibility matrix as JSON, and a read-only Model Context Protocol server."
last_checked: 2026-10-21
license: CC BY 4.0
---

# This site is built the way it argues.

Every page is a part with an open interface. People read the HTML. Agents read the same facts as Markdown, as JSON or through a Model Context Protocol (MCP) server. All of it is read-only, free and needs no key.

## Interfaces

- **/llms.txt** (Summary): A curated summary of the site and the matrix (llmstxt.org format).
- **/llms-full.txt** (Full text): Every page in one Markdown file.
- **Accept: text/markdown** (Markdown): Every page has a Markdown copy at the same path plus .md (/index.md for the home page). Send the header Accept: text/markdown to any page URL and you get the Markdown copy.
- **/matrix.json** (Data): The compatibility matrix: one entry per client, with the status, source URL and check date of each cell. CORS is open.
- **/mcp** (MCP): A read-only MCP server over Streamable HTTP. No sign-in. Four tools, listed below.
- **/robots.txt and /sitemap.xml** (Crawl): AI crawlers and search crawlers are welcome. Content signals: search, AI input and AI training are all allowed.

## MCP tools

- `define_agent_composability`: The sourced definition, with its quotes and URLs.
- `get_compatibility_matrix`: Which agents an official source lists for each standard. Optional filters: client and standard.
- `list_standards`: The standards layer: AGENTS.md, MCP, A2A, Agent Skills and the rest, with status and sources.
- `read_page`: Any page of this site as Markdown: why, standards, work, agents, domain, sources.

## Connect

Terminal · Claude Code:

```
claude mcp add --transport http agentcomposability https://agentcomposability.com/mcp
```

JSON · MCP client configuration:

```
{
  "mcpServers": {
    "agentcomposability": {
      "type": "http",
      "url": "https://agentcomposability.com/mcp"
    }
  }
}
```

Terminal · Test with curl:

```
curl -s https://agentcomposability.com/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'
```

## Rules for citing

- Cite the source URL of a matrix cell, not only this site. Each cell names its source and check date.
- “Not listed” means that the source we checked does not name the client. It is not proof that the client has no support.
- For the newest state, follow the source link. Our check dates are in matrix.json.