Revoke an IOC by its value hash, pushing the expiration event to all active subscriptions in real-time. Call this when an IOC is determined to be a false positive, expired, or superseded. Subscribed agents receive the revocation event on their next drain_subscription() call with event_type="revoc...
Part of the Nullcone Threat Intelligence server.
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AI agents may call revoke_ioc to permanently remove or destroy resources in Nullcone Threat Intelligence. Without a policy, an autonomous agent could delete critical data in a loop with no way to undo the damage. PolicyLayer blocks destructive tools by default and requires explicit human approval before enabling them.
Without a policy, an AI agent could call revoke_ioc in a loop, permanently destroying resources in Nullcone Threat Intelligence. There is no undo for destructive operations. PolicyLayer blocks this tool by default and only allows it when a human explicitly approves the action.
Destructive tools permanently remove data. Block by default. Only enable with explicit approval workflows.
{
"version": "1",
"default": "deny",
"hide": [
"revoke_ioc"
]
}See the full Nullcone Threat Intelligence policy for all 30 tools.
These attack patterns abuse exactly the kind of access revoke_ioc gives an agent. Each links to the full case and the policy that stops it:
Other destructive tools across the catalogue. The same approach applies to each: deny by default, or require human approval.
Revoke an IOC by its value hash, pushing the expiration event to all active subscriptions in real-time. Call this when an IOC is determined to be a false positive, expired, or superseded. Subscribed agents receive the revocation event on their next drain_subscription() call with event_type="revocation". Args: value_hash: SHA256 of {ioc_type}:{value.lower()} — same format as IOC.value_hash(). Obtainable from list_revocations() or the threat signature record. reason: One of: false_positive, expired, superseded, attribution_error, retracted. ioc_type: Original IOC type (optional, for subscriber filtering). Returns: event: Revocation event details. pushed: Number of active subscriptions notified.. It is categorised as a Destructive tool in the Nullcone Threat Intelligence MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Nullcone Threat Intelligence MCP server in PolicyLayer and add a rule for revoke_ioc: 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 Nullcone Threat Intelligence. Nothing to install.
revoke_ioc 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 revoke_ioc 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 revoke_ioc. 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.
revoke_ioc is provided by the Nullcone Threat Intelligence MCP server (https://nullcone.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 30 Nullcone Threat Intelligence tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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