Retrieve a list of all regions that support workspaces
AI agents call list_regions to retrieve information from SingleStore MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves informational data about available regions. It performs no side effects, makes no modifications, executes no code, and poses minimal risk if misused by an AI agent. It falls squarely into the Read category as a data retrieval operation.
From the tool's definition Tool name 'list_regions' and description 'Retrieve a list of all regions that support workspaces' indicate a query operation that fetches metadata without modifying any data.
Documented attack patterns abuse exactly the kind of access list_regions gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and SingleStore MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_regions:
{
"version": "1",
"default": "deny",
"tools": {
"list_regions": {}
}
}list_regions is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Retrieve a list of all regions that support workspaces. It is categorised as a Read tool in the SingleStore MCP Server MCP Server, which means it retrieves data without modifying state.
Register the SingleStore MCP Server MCP server in PolicyLayer and add a rule for list_regions: 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 SingleStore MCP Server. Nothing to install.
list_regions 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_regions 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_regions. 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_regions is provided by the SingleStore MCP Server MCP server (singlestore-labs/mcp-server-singlestore). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 24 SingleStore MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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24 SingleStore MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.