On Anthropic’s source code leak, the supply chain trap hiding in plain sight, and what 512,000 lines of TypeScript can and cannot tell you about how a language model thinks

Someone at Anthropic had a bad day at the end of March 2026. Not a catastrophic day — no servers went down, no model weights escaped, no customer records leaked. But somebody changed a build configuration, probably in the ordinary course of trying to ship a software release, and accidentally included a file they weren’t supposed to include. The file was a source map. Source maps are mundane things. They exist so that developers can debug minified, compressed JavaScript by tracing cryptic gibberish back to the readable TypeScript it was compiled from. They are the footnotes of the software world, meant only for the author’s eyes.

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