line_edit · MCP SmallEdit MCP: Risk & Policy

WHAT IT DOES

What line_edit does on MCP SmallEdit

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

WHY IT NEEDS A POLICY

Why line_edit needs a policy

This tool modifies file content by editing specific lines, which is a reversible Write operation. It doesn't execute arbitrary code (Execute), doesn't irreversibly delete data (Destructive), and doesn't create financial obligations (Financial).

From the tool's definition Tool description states 'Edit specific lines by number or range'. The server description emphasizes 'edits to files' and 'modifications', which are Write operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

line_edit Rate-limited

line_edit 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": {
    "line_edit": {
      "limits": [
        {
          "counter": "line_edit_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 SmallEdit, so you can run agents against it safely.

FAQ

Questions about line_edit

What does the line_edit tool do? +

Edit specific lines by number or range. It is categorised as a Write tool in the MCP SmallEdit MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on line_edit? +

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

What risk level is line_edit? +

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

Can I rate-limit line_edit? +

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

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

line_edit is provided by the MCP SmallEdit MCP server (mikeybeez/mcp-smalledit). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.