Delete a folder/notebook from Joplin (requires confirmation)
AI agents call delete_folder to permanently remove resources in Joplin — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Deletion of folders/notebooks is an irreversible destructive action that removes all contained notes and hierarchical data. Even with confirmation required, the outcome is permanent data loss, placing this in the Destructive category.
From the tool's definition Tool name is 'delete_folder' and description states 'Delete a folder/notebook from Joplin' – irreversible deletion operation. The sibling tools include many reversible operations (create, edit, read) but this one permanently removes data.
Attacks that exploit this kind of access
Delete a folder/notebook from Joplin (requires confirmation). It is categorised as a Destructive tool in the Joplin MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Joplin 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. 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 (joplin-mcp-server). 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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