AI agents call delete_folder to permanently remove resources in Joplin MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Deleting a folder irreversibly removes data and cannot be undone. This is a destructive operation with high blast radius if triggered unintentionally by an AI agent—it could wipe entire collections of notes and subfolders.
From the tool's definition Tool name 'delete_folder' and sibling tool 'delete_note' indicate irreversible deletion operations. The empty description is consistent with a destructive action. Context shows this is part of a note-taking system where folders contain user data.
Documented attack patterns abuse exactly the kind of access delete_folder gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Joplin MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for delete_folder:
{
"version": "1",
"default": "deny",
"hide": [
"delete_folder"
]
}delete_folder 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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delete_folder. It is categorised as a Destructive tool in the Joplin MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Joplin MCP Server MCP server in PolicyLayer and add a rule for delete_folder: 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 Joplin MCP Server. Nothing to install.
delete_folder 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_folder 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_folder. 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_folder is provided by the Joplin MCP Server MCP server (jakubfrieb/mcp-joplin). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Joplin MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
13 Joplin MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.