AI agents call delete_series_by_uid to permanently remove resources in Prometheus MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
The tool performs deletion of time series data by unique identifier. This is an irreversible destructive action that removes monitoring data permanently. Although the description is empty, the function name is explicit enough to warrant high confidence classification as Destructive rather than Write.
From the tool's definition Tool name 'delete_series_by_uid' contains the verb 'delete', which indicates irreversible removal of data. In a Prometheus context, deleting time series is a destructive operation that cannot be undone.
Documented attack patterns abuse exactly the kind of access delete_series_by_uid gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Prometheus MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for delete_series_by_uid:
{
"version": "1",
"default": "deny",
"hide": [
"delete_series_by_uid"
]
}delete_series_by_uid disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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delete_series_by_uid. It is categorised as a Destructive tool in the Prometheus MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Prometheus MCP Server MCP server in PolicyLayer and add a rule for delete_series_by_uid: 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 Prometheus MCP Server. Nothing to install.
delete_series_by_uid 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 delete_series_by_uid 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 delete_series_by_uid. 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.
delete_series_by_uid is provided by the Prometheus MCP Server MCP server (awslabs.prometheus-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Prometheus MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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805 Prometheus MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.