gcp_iam_list_roles

List predefined and custom IAM roles

SERVERGCP MCP Server SOURCEahmedselimmansor-ctrl/gcp_mcp_server

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/ahmedselimmansor-ctrl-gcp-mcp-server/gcp-iam-list-roles.md

WHAT IT DOES

What gcp_iam_list_roles does on GCP MCP Server

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

RISK

Why gcp_iam_list_roles is rated Low

This tool retrieves metadata about IAM roles available in a GCP project. It performs a read-only operation that enumerates existing role definitions. While IAM information can be sensitive in some contexts, listing roles itself has no destructive capability and does not execute code or modify infrastructure.

From the tool's definition Tool name 'list_roles' and description 'List predefined and custom IAM roles' indicate querying/retrieving role definitions with no modification or execution.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs gcp_iam_list_roles safely

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

gcp_iam_list_roles Allowed

gcp_iam_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": {
    "gcp_iam_list_roles": {}
  }
}

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

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

FAQ

Questions about gcp_iam_list_roles

What does the gcp_iam_list_roles tool do? +

List predefined and custom IAM roles. It is categorised as a Read tool in the GCP MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on gcp_iam_list_roles? +

Register the GCP MCP Server MCP server in PolicyLayer and add a rule for gcp_iam_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 GCP MCP Server. Nothing to install.

What risk level is gcp_iam_list_roles? +

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

Can I rate-limit gcp_iam_list_roles? +

Yes. Add a rate_limit block to the gcp_iam_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 gcp_iam_list_roles completely? +

Set action: deny in the PolicyLayer policy for gcp_iam_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 gcp_iam_list_roles? +

gcp_iam_list_roles is provided by the GCP MCP Server MCP server (ahmedselimmansor-ctrl/gcp_mcp_server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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