Delete an option from a list-type custom field.
AI agents call delete_custom_field_option to permanently remove resources in Mycase — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently removes data (a custom field option) that cannot be restored. Even though the scope is narrower than deleting entire records, the irreversible nature of deletion places it in the Destructive category.
From the tool's definition Tool name contains 'delete' and description states it will 'Delete an option from a list-type custom field', indicating irreversible removal of data.
Attacks that exploit this kind of access
Delete an option from a list-type custom field. It is categorised as a Destructive tool in the Mycase MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Mycase MCP server in PolicyLayer and add a rule for delete_custom_field_option: 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 Mycase. Nothing to install.
delete_custom_field_option 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 delete_custom_field_option 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 delete_custom_field_option. 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.
delete_custom_field_option is provided by the Mycase MCP server (rosenadvertising/mycase-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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