Refund escrowed funds back to the buyer. Only the buyer can call this. Use when the seller fails to deliver. Requires DEPLOYER_PRIVATE_KEY env var.
AI agents use refund_escrow to commit financial operations through Base Escrow — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool directly moves cryptocurrency funds (ETH or ERC-20 tokens) from escrow back to a buyer. It commits irreversible financial transactions on a blockchain and represents the highest-severity misuse risk: an AI agent with access could unilaterally refund arbitrary escrow deals, causing financial loss to sellers and unauthorized movement of potentially large asset values.
From the tool's definition Tool description states 'Refund escrowed funds back to the buyer' and 'Requires DEPLOYER_PRIVATE_KEY env var', indicating direct movement of cryptocurrency/escrowed funds.
Attacks that exploit this kind of access
Refund escrowed funds back to the buyer. Only the buyer can call this. Use when the seller fails to deliver. Requires DEPLOYER_PRIVATE_KEY env var. It is categorised as a Financial tool in the Base Escrow MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Base Escrow MCP server in PolicyLayer and add a rule for refund_escrow: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Base Escrow. Nothing to install.
refund_escrow is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the refund_escrow rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for refund_escrow. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
refund_escrow is provided by the Base Escrow MCP server (lordbasilaiassistant-sudo/base-escrow-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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