Automated traffic is where post-hoc moderation fails hardest: there is nobody to warn, and volume outruns review. So the check runs before the model, on the same code path the website uses, and the API returns a 403 naming the rule rather than a generic error.
An agent reads the boundary set as structured JSON, composes a request it can already tell will pass, and dry-runs it against /api/v1/check if it wants certainty before spending. There is no configuration of the client that loosens enforcement, because enforcement is not in the client.
The MCP server exposes the same surface as tools, so an assistant can browse the directory, read a boundary set and generate without bespoke HTTP glue.