Get the list of users currently on-call for a specific Grafana OnCall schedule
AI agents call get_current_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 queries and returns oncall schedule information without creating, modifying, deleting, executing commands, or triggering external operations. It is a straightforward data retrieval operation with minimal blast radius if misused by an AI agent.
From the tool's definition Tool name 'get_current_oncall_users' and description 'Get the list of users currently on-call' use the verb 'get' and explicitly retrieve data with no modification or side effects.
Attacks that exploit this kind of access
Get the list of users currently on-call for a specific Grafana OnCall schedule. 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 get_current_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.
get_current_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 get_current_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 get_current_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.
get_current_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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