AI agents call unlink_file to permanently remove resources in Kanban — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
The name 'unlink_file' strongly suggests removing a file association or link from a kanban item. 'Unlink' operations are generally not easily reversible (the association is deleted). Given the empty description, confidence is reduced, but the naming convention and context of sibling tools like 'delete_item', 'delete_tag', 'delete_decision' suggest this is a destructive removal operation.
From the tool's definition Tool name 'unlink_file' — 'unlink' typically means removing a file link or association, which may be irreversible; description is empty.
Documented attack patterns abuse exactly the kind of access unlink_file gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Kanban, and nothing reaches the server without passing your rules. This is the rule we recommend for unlink_file:
{
"version": "1",
"default": "deny",
"hide": [
"unlink_file"
]
}unlink_file disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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unlink_file. It is categorised as a Destructive tool in the Kanban MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Kanban MCP server in PolicyLayer and add a rule for unlink_file: 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 Kanban. Nothing to install.
unlink_file 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 unlink_file 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 unlink_file. 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.
unlink_file is provided by the Kanban MCP server (multidimensionalcats/kanban-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Kanban, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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45 Kanban tools catalogued and risk-classified — across an index of 43,000+ MCP servers.