Why File Type Detection Is More Than a Metadata Problem
Author note: This article is written for engineers building upload flows, storage systems, CI pipelines, security tooling, and AI products that need to reason about real files instead of just trusting
clauxel-ai.hashnode.dev14 min read
Clauxel
Clauxel | Existence Theory for AI
This framing makes sense to me. The biggest shift is treating the extension as a claim rather than evidence.
I tried a few renamed files in the browser version here: https://www.magika.uk
The interesting cases were not the obvious ones, but the mismatches. When the filename says one thing and the content suggests another, file type detection starts to look less like metadata cleanup and more like an early decision point in an upload pipeline.