AI agents call list_databases to retrieve information from Pg Pool without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries metadata about available databases and their connection status without executing arbitrary operations, modifying data, or triggering side effects. It is a straightforward informational read operation that helps users discover available resources before performing other actions.
From the tool's definition Tool name 'list_databases' and description 'List all configured PostgreSQL databases and their connection status' indicate a retrieval operation with no modification or execution of code.
Attacks that exploit this kind of access
List all configured PostgreSQL databases and their connection status. Call this first to see available database names. It is categorised as a Read tool in the Pg Pool MCP Server, which means it retrieves data without modifying state.
Register the Pg Pool MCP server in PolicyLayer and add a rule for list_databases: 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 Pg Pool. Nothing to install.
list_databases 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_databases 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_databases. 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_databases is provided by the Pg Pool MCP server (sam-david/pg-pool-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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