ensure_lines_in_file · Mcp Ssh Tool MCP: Risk & Policy

WHAT IT DOES

What ensure_lines_in_file does on Mcp Ssh Tool

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

WHY IT NEEDS A POLICY

Why ensure_lines_in_file needs a policy

This tool creates or modifies file contents by adding or removing lines. It is reversible (lines can be added back or removed again), so it is Write rather than Destructive. Severity is medium because an AI agent could unintentionally corrupt configuration files or application code on a remote system, but the effect is recoverable.

From the tool's definition Tool description states it 'Ensures specific lines are present or absent in a file,' which modifies file content. The server enables 'autonomous SSH operations' without manual prompts, allowing direct file manipulation on remote systems.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

ensure_lines_in_file Rate-limited

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

FAQ

Questions about ensure_lines_in_file

What does the ensure_lines_in_file tool do? +

Ensures specific lines are present or absent in a file. It is categorised as a Write tool in the Mcp Ssh Tool MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on ensure_lines_in_file? +

Register the Mcp Ssh Tool MCP server in PolicyLayer and add a rule for ensure_lines_in_file: 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 ensure_lines_in_file? +

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

Can I rate-limit ensure_lines_in_file? +

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

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

ensure_lines_in_file 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.