Lists all PostgreSQL databases via psql with owner, encoding, and size info.
AI agents call psql-list-databases to retrieve information from Make without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs database enumeration/introspection by querying PostgreSQL system catalogs. It returns informational data (owner, encoding, size) with no side effects. No data is created, modified, or deleted. The blast radius is minimal—an attacker gains knowledge of database structure but cannot alter or compromise data. This is clearly a Read operation.
From the tool's definition Tool name includes 'list' and description states 'Lists all PostgreSQL databases via psql with owner, encoding, and size info.' This is a read-only query operation that retrieves metadata about existing databases without modification.
Documented attack patterns abuse exactly the kind of access psql-list-databases gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Make, and nothing reaches the server without passing your rules. This is the rule we recommend for psql-list-databases:
{
"version": "1",
"default": "deny",
"tools": {
"psql-list-databases": {}
}
}psql-list-databases is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Lists all PostgreSQL databases via psql with owner, encoding, and size info. It is categorised as a Read tool in the Make MCP Server, which means it retrieves data without modifying state.
Register the Make MCP server in PolicyLayer and add a rule for psql-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 Make. Nothing to install.
psql-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 psql-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 psql-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.
psql-list-databases is provided by the Make MCP server (Dave-London/Pare). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Make, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
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