purchase_orders_cancel
A destructive tool on the ServiceTitan MCP server.
This record as markdown: /tools/jordandalton-servicetitanmcpserver/purchase-orders-cancel.md
What purchase_orders_cancel does on ServiceTitan MCP Server
AI agents call purchase_orders_cancel to permanently remove resources in ServiceTitan MCP Server, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Why purchase_orders_cancel is rated Critical
Canceling purchase orders is a destructive operation that permanently changes the state of business documents. While not strictly deletion, it irreversibly removes the validity of a purchase order, preventing its execution. In a ServiceTitan context (a field service management platform handling business operations), this has cascading business impacts.
From the tool's definition Tool name 'purchase_orders_cancel' indicates irreversible cancellation of purchase orders. The 'cancel' action on financial documents removes their active status and cannot be easily undone without creating new compensating transactions.
Attacks that exploit this kind of access
The rule that runs purchase_orders_cancel safely
PolicyLayer is an MCP gateway: it sits between your AI agents and ServiceTitan MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For purchase_orders_cancel, this is the rule to start with:
purchase_orders_cancel is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect ServiceTitan MCP Server, apply this rule, and every purchase_orders_cancel call is checked against it from then on.
Questions about purchase_orders_cancel
purchase_orders_cancel is a destructive tool on the ServiceTitan MCP Server MCP server. It is categorised as a Destructive tool in the ServiceTitan MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the ServiceTitan MCP Server MCP server in PolicyLayer and add a rule for purchase_orders_cancel: 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 ServiceTitan MCP Server. Nothing to install.
purchase_orders_cancel 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 purchase_orders_cancel 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 purchase_orders_cancel. 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.
purchase_orders_cancel is provided by the ServiceTitan MCP Server MCP server (jordandalton/servicetitanmcpserver). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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