AI agents call crypto.address-screen to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves and checks data (OFAC SDN list status for an address) without modifying, deleting, executing code, or moving funds. It is purely informational/query-based, matching the Read category. Severity is low because misuse would only result in incorrect screening information, with no irreversible consequences or financial impact.
From the tool's definition Tool performs 'sanctions-screen' operation which queries/compares a crypto wallet address against the US Treasury OFAC SDN list. This is a lookup and comparison operation with no side effects on data or systems.
Attacks that exploit this kind of access
Sanctions-screen a crypto wallet address against the US Treasury OFAC SDN list. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for crypto.address-screen: 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 Mcp. Nothing to install.
crypto.address-screen is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the crypto.address-screen 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 crypto.address-screen. 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.
crypto.address-screen is provided by the MCP server (@2sio/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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