Returns a Timestream for InfluxDB DB instance details by the instance-identifier
AI agents call GetDbInstance to retrieve information from Prometheus MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
GetDbInstance retrieves database instance metadata/configuration details without creating, modifying, deleting, or executing any operations. The operation is read-only with no side effects, matching the Read category definition of 'retrieves or queries data; no side effects'. Severity is low as exposure would only leak instance configuration information rather than enable destructive or financial actions.
From the tool's definition Tool description states 'Returns a Timestream for InfluxDB DB instance details' - uses passive 'returns' indicating retrieval/query operation with no modification capability.
Documented attack patterns abuse exactly the kind of access GetDbInstance 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 GetDbInstance:
{
"version": "1",
"default": "deny",
"tools": {
"GetDbInstance": {}
}
}GetDbInstance is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Returns a Timestream for InfluxDB DB instance details by the instance-identifier. It is categorised as a Read tool in the Prometheus MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Prometheus MCP Server MCP server in PolicyLayer and add a rule for GetDbInstance: 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.
GetDbInstance 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 GetDbInstance 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 GetDbInstance. 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.
GetDbInstance 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.