AI agents invoke StartAHORun to trigger actions in Prometheus MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
StartAHORun is classified as Execute because it triggers an external operation (likely a scheduled or on-demand analysis/query run in AWS Prometheus). While not destructive by name, starting an automated run can have side effects depending on what the run does—resources may be consumed, queries may execute, and data may be affected.
From the tool's definition Tool name 'StartAHORun' combined with server context (AWS Managed Prometheus) suggests initiation of an automated operation. The prefix 'Start' and suffix 'Run' indicate execution of a process. Empty description reduces confidence but the action verb is clear.
Documented attack patterns abuse exactly the kind of access StartAHORun 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 StartAHORun:
{
"version": "1",
"default": "deny",
"tools": {
"StartAHORun": {
"limits": [
{
"counter": "startahorun_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}StartAHORun stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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StartAHORun. It is categorised as a Execute tool in the Prometheus MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Prometheus MCP Server MCP server in PolicyLayer and add a rule for StartAHORun: 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.
StartAHORun is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the StartAHORun 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 StartAHORun. 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.
StartAHORun 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.