ssh_upload_and_execute · SSH MCP Server MCP: Risk & Policy

WHAT IT DOES

What ssh_upload_and_execute does on SSH MCP Server

AI agents invoke ssh_upload_and_execute to trigger actions in SSH MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why ssh_upload_and_execute needs a policy

This tool both uploads arbitrary content and immediately executes it on a remote server. The combination of file upload plus remote code execution represents maximum blast radius — an attacker or misconfigured agent could run any malicious script on a remote system.

From the tool's definition 'Upload a script file and execute it on the remote server'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

ssh_upload_and_execute Rate-limited

ssh_upload_and_execute stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "ssh_upload_and_execute": {
      "limits": [
        {
          "counter": "ssh_upload_and_execute_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches SSH MCP Server, so you can run agents against it safely.

FAQ

Questions about ssh_upload_and_execute

What does the ssh_upload_and_execute tool do? +

Upload a script file and execute it on the remote server. It is categorised as a Execute tool in the SSH MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on ssh_upload_and_execute? +

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

What risk level is ssh_upload_and_execute? +

ssh_upload_and_execute is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit ssh_upload_and_execute? +

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

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

ssh_upload_and_execute is provided by the SSH MCP Server MCP server (zibdie/ssh-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.