AI agents call uptimekuma_metrics to retrieve information from Crow without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves uptime and monitoring metrics from Uptime Kuma, a status monitoring system. It has no side effects, does not modify data, and poses minimal risk if misused by an AI agent—at worst, an agent could spam requests or gather information about system availability. No destructive, financial, or execution capabilities are present.
From the tool's definition Tool name 'uptimekuma_metrics' and description 'Fetch Uptime Kuma' indicate data retrieval. The verb 'Fetch' is a classic read operation that queries monitoring metrics without modification.
Documented attack patterns abuse exactly the kind of access uptimekuma_metrics gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Crow, and nothing reaches the server without passing your rules. This is the rule we recommend for uptimekuma_metrics:
{
"version": "1",
"default": "deny",
"tools": {
"uptimekuma_metrics": {}
}
}uptimekuma_metrics is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Fetch Uptime Kuma. It is categorised as a Read tool in the Crow MCP Server, which means it retrieves data without modifying state.
Register the Crow MCP server in PolicyLayer and add a rule for uptimekuma_metrics: 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 Crow. Nothing to install.
uptimekuma_metrics is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the uptimekuma_metrics 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 uptimekuma_metrics. 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.
uptimekuma_metrics is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Crow, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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576 Crow tools catalogued and risk-classified — across an index of 43,000+ MCP servers.