AI agents use attach_servers to create or update resources in Sacloud — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Sacloud environment.
The 'attach_servers' operation most likely attaches servers to load balancers, routers, or other infrastructure components, which is a reversible write operation that modifies cloud resource configurations.
From the tool's definition Tool name 'attach_servers' on Sakura Cloud MCP server with sibling tools including create_* and delete_* operations, indicating infrastructure management capabilities.
Documented attack patterns abuse exactly the kind of access attach_servers gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Sacloud, and nothing reaches the server without passing your rules. This is the rule we recommend for attach_servers:
{
"version": "1",
"default": "deny",
"tools": {
"attach_servers": {
"limits": [
{
"counter": "attach_servers_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}attach_servers 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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attach_servers. It is categorised as a Write tool in the Sacloud MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Sacloud MCP server in PolicyLayer and add a rule for attach_servers: 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 Sacloud. Nothing to install.
attach_servers 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 attach_servers 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 attach_servers. 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.
attach_servers is provided by the Sacloud MCP server (sacloud/sacloud-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Sacloud, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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37 Sacloud tools catalogued and risk-classified — across an index of 43,000+ MCP servers.