gcp_storage_set_bucket_iam_policy

Set IAM policy for a bucket

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-storage-set-bucket-iam-policy.md

WHAT IT DOES

What gcp_storage_set_bucket_iam_policy does on GCP MCP Server

AI agents use gcp_storage_set_bucket_iam_policy 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_storage_set_bucket_iam_policy is rated Medium

Setting IAM policies modifies access control configurations on GCP storage buckets. This is a write operation because it creates or modifies data (policy documents) reversibly—policies can be updated or reverted.

From the tool's definition Tool name contains 'set_bucket_iam_policy' and description states 'Set IAM policy for a bucket'. IAM policy modifications alter access control rules, which is a reversible write operation that affects security permissions.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs gcp_storage_set_bucket_iam_policy 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_storage_set_bucket_iam_policy, this is the rule to start with:

gcp_storage_set_bucket_iam_policy Rate-limited

gcp_storage_set_bucket_iam_policy 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_storage_set_bucket_iam_policy": {
      "limits": [
        {
          "counter": "gcp_storage_set_bucket_iam_policy_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_storage_set_bucket_iam_policy call is checked against it from then on.

FAQ

Questions about gcp_storage_set_bucket_iam_policy

What does the gcp_storage_set_bucket_iam_policy tool do? +

Set IAM policy for a bucket. 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_storage_set_bucket_iam_policy? +

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

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

Can I rate-limit gcp_storage_set_bucket_iam_policy? +

Yes. Add a rate_limit block to the gcp_storage_set_bucket_iam_policy 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_storage_set_bucket_iam_policy completely? +

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

gcp_storage_set_bucket_iam_policy 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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