AI agents use update_stackscript to create or update resources in Linode MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Linode MCP Server environment.
This tool creates or modifies data reversibly—it updates an existing StackScript resource. While the modification is persistent, it does not irreversibly delete data (thus not Destructive) and does not directly execute code on instances (thus not Execute, though the updated script will eventually execute).
From the tool's definition Tool name is 'update_stackscript' and description states 'Update an existing StackScript'. StackScripts in Linode are deployment automation scripts that run on instance boot.
Documented attack patterns abuse exactly the kind of access update_stackscript gives an agent:
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_stackscript:
{
"version": "1",
"default": "deny",
"tools": {
"update_stackscript": {
"limits": [
{
"counter": "update_stackscript_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_stackscript 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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Update an existing StackScript. 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.
Register the Linode MCP Server MCP server in PolicyLayer and add a rule for update_stackscript: 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.
update_stackscript 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 update_stackscript 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 update_stackscript. 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.
update_stackscript 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.
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.
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416 Linode MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.