Prompt Guard v2.5.1 Advanced prompt injection defense + operational security system for AI agents. 🚨 What's New in v2.5.1 (2026-01-31) CRITICAL: System Prompt Mimicry Detection Added detection for attacks that mimic LLM internal system prompts: - , — Anthropic internal tag patterns - , , — Claude artifact system - , , — LLaMA/GPT internal tokens - , , — Famous jailbreak keywords - , — Filter evasion via leetspeak Real-world incident (2026-01-31): An attacker sent fake Claude system prompts in 3 consecutive messages, completely poisoning the session context and causing all subsequent response…