list_enums

A read tool on the Mcpg MCP server.

SERVERMcpg SOURCEpypi:mcpg

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-devopam-mcpg/list-enums.md

WHAT IT DOES

What list_enums does on Mcpg

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

RISK

Why list_enums is rated Low

The tool appears to query PostgreSQL system catalogs to list enum types, which is a read-only metadata retrieval operation. Even though the description is empty, the naming convention and context of a PostgreSQL MCP server strongly suggest this returns information rather than modifying data.

From the tool's definition Tool name 'list_enums' indicates retrieval of enumerated types from PostgreSQL. The 'list' prefix is characteristic of query operations that retrieve metadata without modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_enums safely

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

list_enums Allowed

list_enums 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": {
    "list_enums": {}
  }
}

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

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

FAQ

Questions about list_enums

What does the list_enums tool do? +

list_enums is a read tool on the Mcpg MCP server. It is categorised as a Read tool in the Mcpg MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_enums? +

Register the Mcpg MCP server in PolicyLayer and add a rule for list_enums: 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 Mcpg. Nothing to install.

What risk level is list_enums? +

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

Can I rate-limit list_enums? +

Yes. Add a rate_limit block to the list_enums 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 list_enums completely? +

Set action: deny in the PolicyLayer policy for list_enums. 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 list_enums? +

list_enums is provided by the Mcpg MCP server (pypi:mcpg). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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