add_server · Otoinstall MCP: Risk & Policy

WHAT IT DOES

What add_server does on Otoinstall

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

WHY IT NEEDS A POLICY

Why add_server needs a policy

This tool is classified as Write rather than Execute or Destructive because it stores credentials without immediately executing operations or deleting data. However, severity is elevated to 'high' because compromised server credentials could enable unauthorized access to infrastructure, making this a high-impact Write operation. Confidence is 0.95 due to the clear description explicitly mentioning credential storage.

From the tool's definition The tool description states 'Save FTP/SFTP/SSH server credentials to the user', which involves storing sensitive authentication credentials. This creates new data (credential entries) in a reversible manner.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_server Rate-limited

add_server 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": {
    "add_server": {
      "limits": [
        {
          "counter": "add_server_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 Otoinstall, so you can run agents against it safely.

FAQ

Questions about add_server

What does the add_server tool do? +

Save FTP/SFTP/SSH server credentials to the user. It is categorised as a Write tool in the Otoinstall MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_server? +

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

What risk level is add_server? +

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

Can I rate-limit add_server? +

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

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

add_server is provided by the Otoinstall MCP server (otoinstall-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.