Reset the knowledge graph.
AI agents call prune to permanently remove resources in cognee MCP server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Resetting a knowledge graph is a destructive action that cannot be easily undone. This represents data loss at scale and meets the criteria for the Destructive category (irreversibly deletes or overwrites data).
From the tool's definition Tool description states 'Reset the knowledge graph' — reset implies clearing or reinitializing the entire knowledge graph, which is an irreversible operation that removes all stored data.
Attacks that exploit this kind of access
Reset the knowledge graph. It is categorised as a Destructive tool in the cognee MCP server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the cognee MCP server MCP server in PolicyLayer and add a rule for prune: 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 cognee MCP server. Nothing to install.
prune 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 prune 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 prune. 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.
prune is provided by the cognee MCP server MCP server (jeromyjsmith/cognee-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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