proc_exec · Mcp Ssh Tool MCP: Risk & Policy

WHAT IT DOES

What proc_exec does on Mcp Ssh Tool

AI agents invoke proc_exec to trigger actions in Mcp Ssh Tool. 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 proc_exec needs a policy

This tool runs arbitrary commands on a remote system via SSH. An AI agent could execute any shell command, including destructive operations, privilege escalation, data exfiltration, or system compromise. The blast radius is critical as it provides unrestricted remote code execution on external systems.

From the tool's definition "Executes a command on the remote system"

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

proc_exec Rate-limited

proc_exec 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": {
    "proc_exec": {
      "limits": [
        {
          "counter": "proc_exec_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 Mcp Ssh Tool, so you can run agents against it safely.

FAQ

Questions about proc_exec

What does the proc_exec tool do? +

Executes a command on the remote system. It is categorised as a Execute tool in the Mcp Ssh Tool MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on proc_exec? +

Register the Mcp Ssh Tool MCP server in PolicyLayer and add a rule for proc_exec: 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 Mcp Ssh Tool. Nothing to install.

What risk level is proc_exec? +

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

Can I rate-limit proc_exec? +

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

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

proc_exec is provided by the Mcp Ssh Tool MCP server (skot/mcp-ssh-tool). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.