AgentArmor – open-source 8-layer security framework for AI agents

Detects and mitigates prompt injection attacks across 8 distinct security layers using pattern matching, semantic analysis, and input sanitization techniques. Each layer targets specific attack vectors (direct injection, indirect injection, jailbreaks, token smuggling) with progressive filtering that escalates from syntax-level checks to LLM-based semantic validation, preventing malicious instructions from reaching the agent's core reasoning engine.

Validates and authorizes agent-initiated actions (tool calls, API requests, state modifications) against a configurable policy engine before execution. The framework intercepts agent outputs, parses intended actions, checks them against role-based access control (RBAC) rules and action whitelists, and either permits, blocks, or requires human approval based on risk level and policy configuration.

Filters and redacts sensitive information from agent outputs before returning to users, using pattern matching, PII detection, and semantic analysis to identify and mask credentials, personal data, internal IDs, and other sensitive content. The framework supports configurable redaction rules, regex patterns, and LLM-based semantic detection to prevent accidental data leakage through agent responses.

Enforces rate limits and resource quotas on agent execution to prevent abuse, DoS attacks, and runaway costs. The framework tracks agent invocations, token consumption, API calls, and compute time per user/session/agent, enforcing configurable limits and throttling or rejecting requests that exceed thresholds. Supports sliding window rate limiting, token bucket algorithms, and per-resource quotas.

Monitors agent execution patterns and detects anomalous behavior that may indicate compromise, misconfiguration, or drift from intended behavior. The framework tracks metrics like action frequency, tool usage patterns, response latency, error rates, and semantic drift, comparing against baseline profiles and flagging deviations using statistical methods and ML-based anomaly detection.

Isolates agent context and memory to prevent cross-contamination between concurrent agent instances, users, or sessions. The framework enforces strict separation of execution contexts, ensuring that one agent's state, memory, and cached data cannot leak into another agent's execution. Implements context managers, thread-local storage, and optional process-level isolation for high-security deployments.

Verifies the authenticity and integrity of LLM responses and API calls to prevent man-in-the-middle attacks, model substitution, or response tampering. The framework validates cryptographic signatures on API responses, checks model identity, and verifies that responses come from expected providers using certificate pinning, response signing, and optional hardware attestation.

Provides detailed tracing and explainability for agent decisions, showing which inputs, rules, and reasoning steps led to specific actions or outputs. The framework logs decision paths through the security layers, captures reasoning chains from the LLM, and generates human-readable explanations of why certain actions were approved, denied, or flagged. Supports integration with explainability frameworks (LIME, SHAP) for model-agnostic explanations.

Validates security configuration at deployment time and enforces policy compliance throughout the agent lifecycle. The framework checks configuration files for security misconfigurations (disabled layers, overly permissive rules, weak quotas), validates policy definitions against a schema, and continuously monitors for policy drift or unauthorized changes. Supports policy-as-code with version control and approval workflows.