Move a document to the trash (soft delete; restorable from the web UI within the retention window).
AI agents call delete_document to permanently remove resources in Ai Brain — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool falls under Destructive rather than Write because it deletes data rather than modifying it reversibly through normal operations. While the soft-delete nature and restoration window lower the severity from critical to high (compared to permanent hard deletion), it remains a destructive action that removes access to documents.
From the tool's definition Tool description states 'Move a document to the trash' which removes a document from the knowledge base. Although described as a 'soft delete' with restoration capability, the tool performs an irreversible operation from the API perspective—the document is no…
Attacks that exploit this kind of access
Move a document to the trash (soft delete; restorable from the web UI within the retention window). It is categorised as a Destructive tool in the Ai Brain MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Ai Brain MCP server in PolicyLayer and add a rule for delete_document: 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 Ai Brain. Nothing to install.
delete_document 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_document 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_document. 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_document is provided by the Ai Brain MCP server (thejoshgriffith/ai-brain). 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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