list_roles

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-roles.md

WHAT IT DOES

What list_roles does on Mcpg

AI agents call list_roles 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_roles is rated Low

The tool retrieves role information from PostgreSQL for inspection purposes. No modification, deletion, or execution of arbitrary commands is possible. This is a standard read-only database operation with minimal blast radius if misused—it exposes role metadata but cannot alter system state or trigger external operations.

From the tool's definition Tool name 'list_roles' indicates a retrieval/query operation with no side effects. The function lists database roles, similar to read-only enumeration operations like 'list' or 'get'.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_roles 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_roles, this is the rule to start with:

list_roles Allowed

list_roles 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_roles": {}
  }
}

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_roles call is checked against it from then on.

FAQ

Questions about list_roles

What does the list_roles tool do? +

list_roles 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_roles? +

Register the Mcpg MCP server in PolicyLayer and add a rule for list_roles: 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_roles? +

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

Can I rate-limit list_roles? +

Yes. Add a rate_limit block to the list_roles 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_roles completely? +

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

list_roles 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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