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 - **[Guardrails](https://github.com/guardrails-ai/guardrails)** - A Python framework for validating LLM outputs against structural and semantic rules (e.g., "must return valid JSON," "must not contain PII").
 - **[LiteLLM Guardrails](https://github.com/BerriAI/litellm)** - While known for model proxying, LiteLLM includes built-in guardrail features to filter requests and responses across multiple LLM providers.
 - **[OWASP Agent Memory Guard](https://github.com/OWASP/www-project-agent-memory-guard)** - An official OWASP project that detects and blocks AI agent memory poisoning attacks (OWASP ASI06). Provides a drop-in middleware for LangChain, AutoGen, and CrewAI pipelines with real-time threat detection, sanitization hooks, and audit logging. `pip install agent-memory-guard`.
+- **[Reapproval Gate](https://github.com/selfradiance/reapproval-gate)** - A deterministic local gate that evaluates a proposed agent action against human-approved scope and returns allow, deny, or reapproval_required on escalation thresholds.
 
 ## 📊 Benchmarks & Datasets
 *Resources to evaluate agent security performance.*