Cancel all open orders across all markets. Use with caution.
AI agents call cancel_all_orders to permanently remove resources in Polymarket MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool irreversibly destroys all open orders in a user's portfolio without requiring individual confirmation per order. While 'cancel' is technically reversible (orders can be re-placed), the automatic bulk cancellation of all positions across all markets represents a destructive action with severe financial consequences. The 'Use with caution' warning reinforces the high-risk nature.
From the tool's definition Tool name: 'cancel_all_orders'. Description states: 'Cancel all open orders across all markets. Use with caution.' The phrase 'cancel all' combined with 'all markets' indicates irreversible bulk cancellation of financial positions.
Attacks that exploit this kind of access
Cancel all open orders across all markets. Use with caution. It is categorised as a Destructive tool in the Polymarket MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Polymarket MCP Server MCP server in PolicyLayer and add a rule for cancel_all_orders: 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 Polymarket MCP Server. Nothing to install.
cancel_all_orders 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_all_orders 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_all_orders. 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_all_orders is provided by the Polymarket MCP Server MCP server (nancheng582-jpg/polymarket-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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