storage_generate_signed_url · Google Cloud MCP

WHAT IT DOES

What storage_generate_signed_url does on Google Cloud

AI agents invoke storage_generate_signed_url to trigger actions in Google Cloud. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why storage_generate_signed_url needs a policy

Generating a signed URL for Cloud Storage creates a time-limited, pre-authorized URL that grants access to a storage object without requiring authentication. This is an active operation that produces a shareable credential, potentially exposing private data to unintended parties.

From the tool's definition Tool name 'storage_generate_signed_url' — description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

storage_generate_signed_url Rate-limited

storage_generate_signed_url stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "storage_generate_signed_url": {
      "limits": [
        {
          "counter": "storage_generate_signed_url_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Google Cloud, so you can run agents against it safely.

FAQ

Questions about storage_generate_signed_url

What does the storage_generate_signed_url tool do? +

storage_generate_signed_url. It is categorised as a Execute tool in the Google Cloud MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on storage_generate_signed_url? +

Register the Google Cloud MCP server in PolicyLayer and add a rule for storage_generate_signed_url: 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 Google Cloud. Nothing to install.

What risk level is storage_generate_signed_url? +

storage_generate_signed_url is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit storage_generate_signed_url? +

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

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

storage_generate_signed_url is provided by the Google Cloud MCP server (lockon-n/google-cloud-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.