gcp_iam_create_custom_role

Create a custom IAM role in the project

SERVERGCP MCP Server SOURCEahmedselimmansor-ctrl/gcp_mcp_server

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/ahmedselimmansor-ctrl-gcp-mcp-server/gcp-iam-create-custom-role.md

WHAT IT DOES

What gcp_iam_create_custom_role does on GCP MCP Server

AI agents use gcp_iam_create_custom_role to create or update resources in GCP MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your GCP MCP Server environment.

RISK

Why gcp_iam_create_custom_role is rated Medium

Creating custom IAM roles is a reversible write operation that modifies the project's identity and access management configuration. While it affects security posture significantly (hence high severity), it is not destructive (roles can be deleted), does not execute arbitrary code, and does not move money.

From the tool's definition Tool name contains 'create' and description states 'Create a custom IAM role in the project'. This creates new IAM role definitions that modify access control policies.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs gcp_iam_create_custom_role 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_create_custom_role, this is the rule to start with:

gcp_iam_create_custom_role Rate-limited

gcp_iam_create_custom_role stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "gcp_iam_create_custom_role": {
      "limits": [
        {
          "counter": "gcp_iam_create_custom_role_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT 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_create_custom_role call is checked against it from then on.

FAQ

Questions about gcp_iam_create_custom_role

What does the gcp_iam_create_custom_role tool do? +

Create a custom IAM role in the project. It is categorised as a Write tool in the GCP MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on gcp_iam_create_custom_role? +

Register the GCP MCP Server MCP server in PolicyLayer and add a rule for gcp_iam_create_custom_role: 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_create_custom_role? +

gcp_iam_create_custom_role is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit gcp_iam_create_custom_role? +

Yes. Add a rate_limit block to the gcp_iam_create_custom_role 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_create_custom_role completely? +

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

gcp_iam_create_custom_role 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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