insert_lines · MCP Template MCP: Risk & Policy

WHAT IT DOES

What insert_lines does on MCP Template

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

WHY IT NEEDS A POLICY

Why insert_lines needs a policy

The tool creates or modifies data by inserting lines into pages, which is a reversible operation. It does not delete data (making it not Destructive), does not execute arbitrary code (not Execute), and does not involve financial transactions (not Financial). The sibling tools confirm this is a content management context where insert_lines is a standard Write operation.

From the tool's definition Tool description: 'insert_lines' performs insertion of new lines into a specified page. The Japanese description states it 'inserts new lines at specified lines of a designated page' and mentions 'appending to the end if line numbers are omitted' and…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

insert_lines Rate-limited

insert_lines 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": {
    "insert_lines": {
      "limits": [
        {
          "counter": "insert_lines_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 Template, so you can run agents against it safely.

FAQ

Questions about insert_lines

What does the insert_lines tool do? +

指定ページの指定行に新しい行を挿入。行番号を省略すると末尾に追記。WebSocket API経由で即時更新。. It is categorised as a Write tool in the MCP Template MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on insert_lines? +

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

What risk level is insert_lines? +

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

Can I rate-limit insert_lines? +

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

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

insert_lines is provided by the MCP Template MCP server (masseater/scrapbox-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.