AgentGuard – Transaction guardrails for AI agents that hold wallets

AgentGuard is an open-source (Apache 2.0) transaction guardrail layer for AI agents holding crypto wallets: before signing or broadcasting, an agent submits the proposed transaction to AgentGuard, which simulates it against live chain state, evaluates the effects against an operator-defined policy, and returns allow, block or escalate with an explanation, a 0–100 risk score and an immutable audit record. It supports EVM chains and Solana, decodes common drain vectors (unlimited approvals, setApprovalForAll, permits, zero-minimum-output swaps, SetAuthority, never-seen contracts), and ships a conservative default policy plus a TypeScript SDK that wraps any signer so signTransaction/sendTransaction are checked transparently. An optional separately licensed @agentguard/behavior package adds per-agent behavioral anomaly scoring, and both it and the reputation layer fail closed on outages or unreadable profiles.