{ "id": "mime_detect_bytes", "category": "mime_utilities", "description": "Detect MIME type from file bytes", "tags": ["mime", "detection", "bytes"], "call": "detect_mime_type_from_bytes", "input": { "data": "pdf/fake_memo.pdf" }, "assertions": [ { "type": "contains", "field": "result", "value": "pdf" } ] }