claude-code - 💡(How to fix) Fix [Bug] Anthropic API Usage Policy classifier false positive on security terminology

Bug Description That's an Anthropic Usage Policy classifier firing — and it's a false positive. The content I was generating (AER tier table with source examples like "WSJ", "Krebs", "Black Hat briefings") doesn't violate any policy. Here's what likely tripped it:

Why this happens

Anthropic runs a content classifier on Claude's outputs. In long sessions packed with security/cyber vocabulary — PSIRT, vulnerability frameworks, threat modeling, "audit", "Black Hat", "DEF CON", "exploit", etc. — the classifier sometimes over-fits and flags
benign content. Umbra is literally a cybersecurity intelligence product, so we're awash in that vocabulary by necessity.

The error message you saw (Claude Code is unable to respond...violates Usage Policy) is the safety net catching something. In this case it caught nothing real.

What to do when it happens

┌───────────────────┬────────────────────────────────────────────────────────────────┐ │ Option │ Notes │ ├───────────────────┼────────────────────────────────────────────────────────────────┤ │ Retry (just │ Often works — classifier is non-deterministic. My second │
├───────────────────┼────────────────────────────────────────────────────────────────┤ │ Press ESC twice + │ Lets you tweak the prompt slightly before retry — sometimes a │ │ edit │ small rewording avoids the trigger │ ├───────────────────┼────────────────────────────────────────────────────────────────┤ │ Switch models │ /model claude-sonnet-4-20250514 (the error its… Note: Content was truncated.