update_sharegroup_image

THE RISK

Medium Risk

Why update_sharegroup_image needs a policy

This tool modifies (updates) an existing shared image resource, qualifying it as Write category. Severity is high because unauthorized updates to shared images could affect multiple users who depend on that image, potentially corrupting their deployments or exposing sensitive data embedded in the image. The blast radius extends beyond a single user to all share group members relying on that image.

From the tool's definition update_sharegroup_image updates a shared image in a share group, which modifies existing data in Linode's image sharing infrastructure.

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

POLICY

How to control update_sharegroup_image

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 update_sharegroup_image:

policy.json

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

update_sharegroup_image 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.

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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 416 Linode MCP Server tools →

Write 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.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about update_sharegroup_image

What does the update_sharegroup_image tool do? +

Update a shared image in a share group. It is categorised as a Write tool in the Linode 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 update_sharegroup_image? +

Register the Linode MCP Server MCP server in PolicyLayer and add a rule for update_sharegroup_image: 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 update_sharegroup_image? +

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

Can I rate-limit update_sharegroup_image? +

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

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

update_sharegroup_image 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 →