Delete a note and optionally clean up all references to it in other notes.
AI agents call delete_note to permanently remove resources in Obsidian Knowledge Management MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool irreversibly removes data (markdown files) from the Obsidian vault. Deletion cannot be undone through the tool itself, and the optional cleanup of references means the operation can have cascading effects throughout the vault. In the context of an AI agent, misuse could result in permanent loss of user knowledge/notes.
From the tool's definition Tool name is 'delete_note' and description states 'Delete a note and optionally clean up all references to it in other notes.' The verb 'delete' combined with the irreversible nature of removing a note from a vault matches the Destructive category definition.
Attacks that exploit this kind of access
Delete a note and optionally clean up all references to it in other notes. It is categorised as a Destructive tool in the Obsidian Knowledge Management MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Obsidian Knowledge Management MCP Server MCP server in PolicyLayer and add a rule for delete_note: 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 Obsidian Knowledge Management MCP Server. Nothing to install.
delete_note 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_note 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_note. 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_note is provided by the Obsidian Knowledge Management MCP Server MCP server (theoutcastvirus/obsidian-knowledge-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
delete_note is one line of Obsidian Knowledge Management MCP Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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