Cancel an order onchain, preventing it from ever being fulfilled.
AI agents call cancel_opensea_order to permanently remove resources in SEI MCP Server V2 — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Cancelling an on-chain order is irreversible — once the cancellation transaction is confirmed on the blockchain, the order is permanently invalidated and can never be fulfilled. This is a destructive action with high blast radius since it could destroy active marketplace orders potentially representing significant value.
From the tool's definition Cancel an order onchain, preventing it from ever being fulfilled.
Attacks that exploit this kind of access
Cancel an order onchain, preventing it from ever being fulfilled. It is categorised as a Destructive tool in the SEI MCP Server V2 MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the SEI MCP Server V2 MCP server in PolicyLayer and add a rule for cancel_opensea_order: 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 SEI MCP Server V2. Nothing to install.
cancel_opensea_order is a Destructive 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 cancel_opensea_order 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 cancel_opensea_order. 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.
cancel_opensea_order is provided by the SEI MCP Server V2 MCP server (testinguser1111111/sei-mcp-server). 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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