# Build path 3: direct API + MCP

The leanest stack: one LLM API with tool use, plus MCP servers exposing your systems. Host an MCP server for your product and every MCP-compatible assistant can act on it. This is agent distribution, not just construction.

Canonical: https://robauto.ai/learn/ai-agents/12

_AI Agents: Software That Does the Work — lesson 12 of 24 (PLAYBOOK)_

The leanest stack: one LLM API with tool use, plus MCP servers exposing your systems. Host an MCP server for your product and every MCP-compatible assistant can act on it. This is agent distribution, not just construction.

Source: [Model Context Protocol docs](https://modelcontextprotocol.io?utm_source=robauto)

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Machine surfaces: https://robauto.ai/llms.txt · https://robauto.ai/llms-full.txt · https://robauto.ai/.well-known/api-catalog