run_expect_script · Command Line Interface Enhancer MCP

WHAT IT DOES

What run_expect_script does on Command Line Interface Enhancer

AI agents invoke run_expect_script to trigger actions in Command Line Interface Enhancer. 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 run_expect_script needs a policy

This tool executes expect/send automation scripts against interactive programs, giving an AI agent the ability to interact with any command-line tool or service through scripted automation. The blast radius is critical because expect scripts can execute arbitrary commands, modify system state, and interact with privileged programs.

From the tool's definition Tool named 'run_expect_script' on a server that 'Enables execution of shell commands' and 'handling interactive programs using expect/send sequences'.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

run_expect_script Rate-limited

run_expect_script 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": {
    "run_expect_script": {
      "limits": [
        {
          "counter": "run_expect_script_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 Command Line Interface Enhancer, so you can run agents against it safely.

FAQ

Questions about run_expect_script

What does the run_expect_script tool do? +

run_expect_script. It is categorised as a Execute tool in the Command Line Interface Enhancer MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on run_expect_script? +

Register the Command Line Interface Enhancer MCP server in PolicyLayer and add a rule for run_expect_script: 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 Command Line Interface Enhancer. Nothing to install.

What risk level is run_expect_script? +

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

Can I rate-limit run_expect_script? +

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

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

run_expect_script is provided by the Command Line Interface Enhancer MCP server (jon2allen/mcp_command_serv). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.