Get metadata for metrics
AI agents call get-metadata to retrieve information from Prometheus without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves metadata about metrics from Prometheus—a pure read operation that queries existing data without creating, modifying, deleting, or executing code. No side effects or irreversible actions are possible. The metadata retrieved would include information such as metric type, help text, and cardinality, which are informational in nature.
From the tool's definition Tool name 'get-metadata' combined with description 'Get metadata for metrics' indicates a retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
Get metadata for metrics. It is categorised as a Read tool in the Prometheus MCP Server, which means it retrieves data without modifying state.
Register the Prometheus MCP server in PolicyLayer and add a rule for get-metadata: 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. Nothing to install.
get-metadata 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 get-metadata 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 get-metadata. 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.
get-metadata is provided by the Prometheus MCP server (mateusdata/prometheus-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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