Create a new startup script.
AI agents use create_startup_script to create or update resources in Vultr MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Vultr MCP environment.
This tool creates a new startup script, which is a Write operation. It stores a script that will execute on new instances, but the act of creating the script itself is reversible (it can be deleted). However, if misused, a malicious startup script could be attached to instances and execute harmful code, raising the severity to medium.
From the tool's definition "Create a new startup script" — creates a new resource (startup script) on the Vultr platform
Documented attack patterns abuse exactly the kind of access create_startup_script gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Vultr MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for create_startup_script:
{
"version": "1",
"default": "deny",
"tools": {
"create_startup_script": {
"limits": [
{
"counter": "create_startup_script_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_startup_script 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.
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Create a new startup script. It is categorised as a Write tool in the Vultr MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Vultr MCP server in PolicyLayer and add a rule for create_startup_script: 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 Vultr MCP. Nothing to install.
create_startup_script is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_startup_script 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.
Set action: deny in the PolicyLayer policy for create_startup_script. 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.
create_startup_script is provided by the Vultr MCP server (rsp2k/mcp-vultr). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Vultr MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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284 Vultr MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.