Delete multiple documents by their IDs
AI agents call delete_documents to permanently remove resources in MCP Knowledge Base Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Deletion of documents cannot be undone and represents permanent loss of data. The ability to delete multiple documents by ID means an agent could systematically wipe knowledge base contents. This is more severe than Write (reversible modification) and warrants Destructive classification.
From the tool's definition Tool name is 'delete_documents' and description states 'Delete multiple documents by their IDs' — this irreversibly removes data from the knowledge base without a reversible operation.
Attacks that exploit this kind of access
Delete multiple documents by their IDs. It is categorised as a Destructive tool in the MCP Knowledge Base Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the MCP Knowledge Base Server MCP server in PolicyLayer and add a rule for delete_documents: 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 MCP Knowledge Base Server. Nothing to install.
delete_documents 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_documents 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_documents. 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_documents is provided by the MCP Knowledge Base Server MCP server (maxsmosarski/mcp-knowledge-base). 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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