# System Architecture

The architecture follows a gateway pattern where all client requests: whether from the web frontend, the Python SDK, CodeXero, or external AI agents: hit a single Fastify-based API gateway. The gateway handles authentication, billing, rate limiting, and request routing.

<figure><img src="/files/5HocuO7PIL4RCqzKmD2k" alt=""><figcaption></figcaption></figure>


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