Claude Code Is Steganographically Marking Requests

Security, Reverse Engineering, Privacy(thereallo.dev)view on HackerNews

Claude CodeAIsteganographyprompt engineeringprivacysecurityreverse engineering

Author: kirushik

Date: 6/30/2026

Article Summary:

The author discovers that the Claude Code AI tool is embedding hidden system prompt markers based on API base URL and timezone in its requests, which could be used to identify and classify users.