psql-list-databases

Lists all PostgreSQL databases via psql with owner, encoding, and size info.

SERVERNpm SOURCEDave-London/Pare

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-dave-london-npm/psql-list-databases.md

WHAT IT DOES

What psql-list-databases does on Npm

AI agents call psql-list-databases to retrieve information from Npm without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why psql-list-databases is rated Low

This tool retrieves and displays database information (owner, encoding, size) with no side effects. It is a pure read operation analogous to listing resources. The blast radius of misuse is minimal — exposure of database metadata could inform an attacker but does not directly compromise data integrity or cause financial harm.

From the tool's definition Tool name is 'psql-list-databases' and description states it 'Lists all PostgreSQL databases' — a query operation that retrieves metadata about existing databases without modifying them.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs psql-list-databases safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Npm, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For psql-list-databases, this is the rule to start with:

psql-list-databases Allowed

psql-list-databases is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "psql-list-databases": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Npm, apply this rule, and every psql-list-databases call is checked against it from then on.

FAQ

Questions about psql-list-databases

What does the psql-list-databases tool do? +

Lists all PostgreSQL databases via psql with owner, encoding, and size info. It is categorised as a Read tool in the Npm MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on psql-list-databases? +

Register the Npm 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 Npm. Nothing to install.

What risk level is psql-list-databases? +

psql-list-databases is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit psql-list-databases? +

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.

How do I block psql-list-databases completely? +

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.

What MCP server provides psql-list-databases? +

psql-list-databases is provided by the Npm MCP server (Dave-London/Pare). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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