mcp_list_databases

List all databases in the MongoDB instance.

SERVERMongo-MCP SOURCE441126098/mongo-mcp

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/441126098-mongo-mcp/mcp-list-databases.md

WHAT IT DOES

What mcp_list_databases does on Mongo-MCP

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

RISK

Why mcp_list_databases is rated Low

This tool retrieves metadata about databases without altering any data or triggering side effects. It is informational only and poses minimal risk even if called repeatedly or by an untrusted agent. The blast radius is restricted to information disclosure about database names, which is typically low-sensitivity metadata.

From the tool's definition Tool name is 'mcp_list_databases' and description states it 'List all databases in the MongoDB instance' — a pure query operation with no modification, deletion, or execution of code.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs mcp_list_databases safely

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

mcp_list_databases Allowed

mcp_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": {
    "mcp_list_databases": {}
  }
}

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

The button opens the PolicyLayer dashboard: create your workspace, connect Mongo-MCP, apply this rule, and every mcp_list_databases call is checked against it from then on.

FAQ

Questions about mcp_list_databases

What does the mcp_list_databases tool do? +

List all databases in the MongoDB instance. It is categorised as a Read tool in the Mongo-MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on mcp_list_databases? +

Register the Mongo MCP server in PolicyLayer and add a rule for mcp_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 Mongo-MCP. Nothing to install.

What risk level is mcp_list_databases? +

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

Can I rate-limit mcp_list_databases? +

Yes. Add a rate_limit block to the mcp_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 mcp_list_databases completely? +

Set action: deny in the PolicyLayer policy for mcp_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 mcp_list_databases? +

mcp_list_databases is provided by the Mongo MCP server (441126098/mongo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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