generate_object_url

THE RISK

Low Risk

Why generate_object_url needs a policy

Generating a pre-signed URL is a read operation that creates a temporary access URL without modifying the underlying object. However, it has medium severity because pre-signed URLs grant access to objects that may be private, potentially exposing sensitive data if misused by an AI agent.

From the tool's definition Generate a pre-signed URL for an object in a bucket

Documented attack patterns abuse exactly the kind of access generate_object_url gives an agent:

POLICY

How to control generate_object_url

PolicyLayer is an MCP gateway — it sits between your AI agents and Linode MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for generate_object_url:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "generate_object_url": {}
  }
}

generate_object_url is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Linode MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Linode MCP Server tools

Destructive cancel_account Cancel your account Destructive cancel_backups Cancel backups for a Linode instance Destructive cancel_object_storage Cancel Object Storage service Destructive delete_alert_definition Delete an alert definition Destructive delete_api_token Delete an API token Destructive delete_config_interface Delete an interface from a configuration profile Destructive delete_domain Delete a domain Destructive delete_domain_record Delete a domain record

All 416 Linode MCP Server tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about generate_object_url

What does the generate_object_url tool do? +

Generate a pre-signed URL for an object in a bucket. It is categorised as a Read tool in the Linode MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on generate_object_url? +

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

What risk level is generate_object_url? +

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

Can I rate-limit generate_object_url? +

Yes. Add a rate_limit block to the generate_object_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 generate_object_url completely? +

Set action: deny in the PolicyLayer policy for generate_object_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 generate_object_url? +

generate_object_url is provided by the Linode MCP Server MCP server (takashito/linode-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Linode MCP Server tool call.

Start from Linode MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →