> Fetch https://askmiles.ai/llms.txt first: it indexes every public Miles capability. This file is the markdown twin of https://askmiles.ai/docs/catalog/errors.

# Catalog errors

What a catalog request returns when it doesn't succeed.

### Error shape

Every error is JSON: `{"error": "message"}`. A card, source program, or destination program that doesn't exist returns 404. A malformed JSON body on a POST endpoint returns 400. An unrecognized path returns 404 with `{"error": "Not found"}`. If the dataset itself is unavailable, card and export endpoints return 503.