Check if a datasource exists by UID or name
AI agents call check_datasource_exists to retrieve information from Grafana MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a lookup/existence check on datasources, which is a read-only operation with no side effects. It returns boolean or status information without creating, modifying, executing, or destroying any resources. The low severity reflects minimal blast radius if misused by an AI agent—at worst, it reveals datasource configuration details that may already be accessible through normal Grafana UI exploration.
From the tool's definition Tool name 'check_datasource_exists' and description 'Check if a datasource exists by UID or name' indicate a query operation that retrieves status information without modifying, executing, or deleting any data.
Attacks that exploit this kind of access
Check if a datasource exists by UID or name. It is categorised as a Read tool in the Grafana MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Grafana MCP Server MCP server in PolicyLayer and add a rule for check_datasource_exists: 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.
check_datasource_exists 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 check_datasource_exists 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 check_datasource_exists. 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.
check_datasource_exists is provided by the Grafana MCP Server MCP server (quanticsoul4772/grafana-mcp). 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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