Claude Code v2.1.100 Silently Injects ~20K Invisible Tokens Per Request — 40% Billing Overhead

Hacker News·medium signal

Efficienist documents that Claude Code v2.1.100 silently adds approximately 20,000 invisible tokens to every request via server-side injection (likely expanded system prompts, safety classifiers, or tool schemas). Max subscribers at $200/month report hitting quota in as little as 19 minutes instead of 5 hours. The hidden tokens also fill the model's actual context window, diluting custom CLAUDE.md instructions and degrading output quality in long sessions. Community workaround: downgrade to v2.1.98.