update_placement_group · Hcloud MCP: Risk & Policy

WHAT IT DOES

What update_placement_group does on Hcloud

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

WHY IT NEEDS A POLICY

Why update_placement_group needs a policy

This tool modifies existing cloud infrastructure metadata reversibly. Updating a placement group's name and labels are non-destructive write operations that can be reverted. While placement groups affect server organization and networking behavior, the action itself is a configuration update rather than creation, deletion, or code execution.

From the tool's definition Tool description states 'Update a placement group (name, labels)' - updates existing configuration data (name and labels) on a placement group resource without deleting or destroying it.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_placement_group Rate-limited

update_placement_group 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": {
    "update_placement_group": {
      "limits": [
        {
          "counter": "update_placement_group_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about update_placement_group

What does the update_placement_group tool do? +

Update a placement group (name, labels). It is categorised as a Write tool in the Hcloud 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_placement_group? +

Register the Hcloud MCP server in PolicyLayer and add a rule for update_placement_group: 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 Hcloud. Nothing to install.

What risk level is update_placement_group? +

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

Can I rate-limit update_placement_group? +

Yes. Add a rate_limit block to the update_placement_group 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_placement_group completely? +

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

update_placement_group is provided by the Hcloud MCP server (xodus-co/hcloud-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.