Retract all facts matching a pattern in a single call. Use ?-prefixed variables as wildcards to retract multiple facts at once. Returns the count and list of retracted facts. Side effects: DESTRUCTIVE — removes multiple facts and cascades TMS retraction for each removed fact (irreversible). Auth:...
Part of the Nocturnusai server.
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AI agents may call retract_pattern to permanently remove or destroy resources in Nocturnusai. 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 retract_pattern in a loop, permanently destroying resources in Nocturnusai. 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": [
"retract_pattern"
]
}See the full Nocturnusai policy for all 16 tools.
These attack patterns abuse exactly the kind of access retract_pattern 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.
Retract all facts matching a pattern in a single call. Use ?-prefixed variables as wildcards to retract multiple facts at once. Returns the count and list of retracted facts. Side effects: DESTRUCTIVE — removes multiple facts and cascades TMS retraction for each removed fact (irreversible). Auth: requires X-Tenant-ID header; FACT_WRITE permission when auth is enabled. Rate-limited per principal. Errors: VALIDATION_ERROR on bad args.. It is categorised as a Destructive tool in the Nocturnusai MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Nocturnusai MCP server in PolicyLayer and add a rule for retract_pattern: 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 Nocturnusai. Nothing to install.
retract_pattern 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 retract_pattern 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 retract_pattern. 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.
retract_pattern is provided by the Nocturnusai MCP server (nocturnusai-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 16 Nocturnusai tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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