List users from Grafana OnCall. Can retrieve all users, a specific user, or filter by username
AI agents call list_oncall_users to retrieve information from Mcp Grafana without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves user information from Grafana OnCall without any side effects. It performs data queries and filtering operations only, matching the Read category definition of retrieving or querying data with no side effects. The severity is low because listing users is non-sensitive operational data that does not grant elevated access, modify systems, or trigger actions.
From the tool's definition Tool description explicitly states 'List users' and 'retrieve all users, a specific user, or filter by username' - these are read-only query operations with no modification, deletion, or execution of commands.
Attacks that exploit this kind of access
List users from Grafana OnCall. Can retrieve all users, a specific user, or filter by username. It is categorised as a Read tool in the Mcp Grafana MCP Server, which means it retrieves data without modifying state.
Register the Mcp Grafana MCP server in PolicyLayer and add a rule for list_oncall_users: 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 Mcp Grafana. Nothing to install.
list_oncall_users 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 list_oncall_users 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 list_oncall_users. 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.
list_oncall_users is provided by the Mcp Grafana MCP server (@leval/mcp-grafana). 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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