prompt-guard
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:
<claude_*>,</claude_*>— Anthropic internal tag patterns<artifacts_info>,<antthinking>,<antartifact>— Claude artifact system[INST],<<SYS>>,<|im_start|>— LLaMA/GPT internal tokensGODMODE,DAN,JAILBREAK— Famous jailbreak keywordsl33tspeak,unr3strict3d— 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 responses to error. This patch detects and blocks such attacks at CRITICAL severity.
🆕 What's New in v2.5.0
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