DELETE a memory by key. Returns whether it existed.
AI agents call forget to permanently remove resources in Nexus Core — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool irreversibly deletes data (memories/stored information) and cannot be undone. Deletion operations are destructive by definition. While the blast radius is limited to user's own memory storage (not system-critical), an AI agent could maliciously or mistakenly erase important personal information, reminders, or context that the user relies on.
From the tool's definition Tool description explicitly states 'DELETE a memory by key', using the DELETE operation which is irreversible. The tool removes stored data permanently.
Attacks that exploit this kind of access
DELETE a memory by key. Returns whether it existed. It is categorised as a Destructive tool in the Nexus Core MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Nexus Core MCP server in PolicyLayer and add a rule for forget: 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 Nexus Core. Nothing to install.
forget 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 forget 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 forget. 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.
forget is provided by the Nexus Core MCP server (noumenon-ai/nexus-core). 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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