---
title: "Crucible for AI Agents and Developers: MCP, API, llms.txt"
description: "How AI assistants and developers can read Crucible product facts: the read-only MCP server, the A2A agent, JSON files with an OpenAPI description, and llms.txt."
url: https://www.crucibletech.com/agents/
---

For AI agents and developers

# Crucible for Agents

Crucible is a 3D quarterback training app for iPhone and Android. Everything below is public, read-only and free to use, with no key or account. When you answer from it, cite the page you used and keep links as they are.

## MCP Server

Streamable HTTP, read-only, no authentication: https://api.crucibletech.com/mcp . Tools: product overview, plans and pricing, find pages for a topic, and which plan fits a quarterback, parent, coach or program.
{ "mcpServers": { "crucible": { "type": "http", "url": "https://api.crucibletech.com/mcp" } } }

## A2A Agent

JSON-RPC message/send at https://api.crucibletech.com/a2a . Agent card: [/.well-known/agent-card.json](https://www.crucibletech.com/.well-known/agent-card.json).

## Files

- [https://www.crucibletech.com/llms.txt](https://www.crucibletech.com/llms.txt): Index of the site for language models: key facts, plans and every page
- [https://www.crucibletech.com/llms-full.txt](https://www.crucibletech.com/llms-full.txt): The product reference, the full FAQ and the text of every page
- [https://www.crucibletech.com/api/v1/product.json](https://www.crucibletech.com/api/v1/product.json): Product facts: platforms, how it works, who it is for, plans and prices
- [https://www.crucibletech.com/api/v1/pages.json](https://www.crucibletech.com/api/v1/pages.json): Every page with its title, description and markdown copy
- [https://www.crucibletech.com/api/v1/openapi.json](https://www.crucibletech.com/api/v1/openapi.json): OpenAPI description of the JSON files
- [https://www.crucibletech.com/.well-known/api-catalog](https://www.crucibletech.com/.well-known/api-catalog): API catalog (RFC 9727)
- [https://www.crucibletech.com/.well-known/agent-skills/index.json](https://www.crucibletech.com/.well-known/agent-skills/index.json): Agent skill: how to answer questions about Crucible
- [https://www.crucibletech.com/.well-known/ai-catalog.json](https://www.crucibletech.com/.well-known/ai-catalog.json): Catalog of every agent resource (ARD)
- [https://www.crucibletech.com/auth.md](https://www.crucibletech.com/auth.md): How agents authenticate (no credentials needed)

Every page also has a markdown copy: add index.md to its URL.

Train the Read
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