list_oncall_users

List users from Grafana OnCall. Can retrieve all users, a specific user, or filter by username

SERVERGrafana MCP Server SOURCE0xteamhq/mcp-grafana

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade C, identity unverified Pull the record →

This record as markdown: /tools/0xteamhq-mcp-grafana/list-oncall-users.md

WHAT IT DOES

What list_oncall_users does on Grafana MCP Server

AI agents call list_oncall_users to retrieve information from Grafana MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why list_oncall_users is rated Low

This tool performs read-only data retrieval from Grafana OnCall's user database. It supports listing and filtering users but does not create, modify, delete, or execute any actions. The blast radius of misuse is minimal—an attacker could enumerate oncall users but cannot compromise systems or data through this tool alone.

From the tool's definition Tool description states 'List users' and 'retrieve all users, a specific user, or filter by username' — these are query operations with no modification, deletion, or execution of side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_oncall_users safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Grafana MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For list_oncall_users, this is the rule to start with:

list_oncall_users Allowed

list_oncall_users is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_oncall_users": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Grafana MCP Server, apply this rule, and every list_oncall_users call is checked against it from then on.

FAQ

Questions about list_oncall_users

What does the list_oncall_users tool do? +

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 Grafana MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_oncall_users? +

Register the Grafana MCP Server 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 Grafana MCP Server. Nothing to install.

What risk level is list_oncall_users? +

list_oncall_users is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_oncall_users? +

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.

How do I block list_oncall_users completely? +

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.

What MCP server provides list_oncall_users? +

list_oncall_users is provided by the Grafana MCP Server MCP server (0xteamhq/mcp-grafana). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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