AI agents call list-sql-instances to retrieve information from GCP MCP 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 Cloud SQL instances (listing/enumeration) with no side effects. It is a read-only operation that returns existing data. While the sibling tools include destructive and financial categories (billing info, cost forecasts), this specific tool only queries instance information.
From the tool's definition Tool name 'list-sql-instances' and description 'List all Cloud SQL instances in the current project' indicate a query operation that retrieves information without modifying or deleting resources.
Attacks that exploit this kind of access
List all Cloud SQL instances in the current project. It is categorised as a Read tool in the GCP MCP MCP Server, which means it retrieves data without modifying state.
Register the GCP MCP server in PolicyLayer and add a rule for list-sql-instances: 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 GCP MCP. Nothing to install.
list-sql-instances 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-sql-instances 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-sql-instances. 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-sql-instances is provided by the GCP MCP server (radiumgu/gcp-ops-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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