vm_agent_file_write

Write content to a file inside a VM via the guest agent.

SERVERProxmox MCP Server SOURCEgethosthewalrus/proxmox-mcp

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/gethosthewalrus-proxmox-mcp/vm-agent-file-write.md

WHAT IT DOES

What vm_agent_file_write does on Proxmox MCP Server

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

RISK

Why vm_agent_file_write is rated Medium

This tool creates or modifies file content within a guest VM, which is a reversible write operation. While it operates on infrastructure (a VM), it does not execute arbitrary code, delete files, or cause financial transactions.

From the tool's definition Tool name contains 'write' and description explicitly states 'Write content to a file inside a VM via the guest agent.'

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs vm_agent_file_write safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Proxmox MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For vm_agent_file_write, this is the rule to start with:

vm_agent_file_write Rate-limited

vm_agent_file_write 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": {
    "vm_agent_file_write": {
      "limits": [
        {
          "counter": "vm_agent_file_write_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 Proxmox MCP Server, apply this rule, and every vm_agent_file_write call is checked against it from then on.

FAQ

Questions about vm_agent_file_write

What does the vm_agent_file_write tool do? +

Write content to a file inside a VM via the guest agent. It is categorised as a Write tool in the Proxmox 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 vm_agent_file_write? +

Register the Proxmox MCP Server MCP server in PolicyLayer and add a rule for vm_agent_file_write: 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 Proxmox MCP Server. Nothing to install.

What risk level is vm_agent_file_write? +

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

Can I rate-limit vm_agent_file_write? +

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

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

vm_agent_file_write is provided by the Proxmox MCP Server MCP server (gethosthewalrus/proxmox-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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