Remove a webhook subscription by its id (returned from subscribe).
AI agents call unsubscribe to permanently remove resources in Nexus Memory — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Unsubscribing removes a webhook subscription irreversibly — the subscription is deleted and any future webhook deliveries tied to it cease. This is a non-reversible deletion action, placing it in the Destructive category. Severity is medium because losing a subscription may cause missed events but does not destroy core data.
From the tool's definition Remove a webhook subscription by its id
Attacks that exploit this kind of access
Remove a webhook subscription by its id (returned from subscribe). It is categorised as a Destructive tool in the Nexus Memory MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Nexus Memory MCP server in PolicyLayer and add a rule for unsubscribe: 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 Memory. Nothing to install.
unsubscribe 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 unsubscribe 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 unsubscribe. 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.
unsubscribe is provided by the Nexus Memory MCP server (neboy72/nexus-memory). 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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