add_investigation_comment · Rapid7 MCP: Risk & Policy

WHAT IT DOES

What add_investigation_comment does on Rapid7

AI agents use add_investigation_comment to create or update resources in Rapid7 — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Rapid7 environment.

WHY IT NEEDS A POLICY

Why add_investigation_comment needs a policy

This tool creates new data (comments/notes) and modifies the investigation record by appending information. It is reversible (comments can typically be edited or deleted). It does not execute code, delete data irreversibly, or move money.

From the tool's definition Tool name 'add_investigation_comment' and description 'Add a comment or note to an InsightIDR investigation' indicate creation/modification of comments within an investigation record.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_investigation_comment Rate-limited

add_investigation_comment 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": {
    "add_investigation_comment": {
      "limits": [
        {
          "counter": "add_investigation_comment_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 Rapid7, so you can run agents against it safely.

FAQ

Questions about add_investigation_comment

What does the add_investigation_comment tool do? +

Add a comment or note to an InsightIDR investigation. It is categorised as a Write tool in the Rapid7 MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_investigation_comment? +

Register the Rapid7 MCP server in PolicyLayer and add a rule for add_investigation_comment: 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 Rapid7. Nothing to install.

What risk level is add_investigation_comment? +

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

Can I rate-limit add_investigation_comment? +

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

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

add_investigation_comment is provided by the Rapid7 MCP server (solomonneas/rapid7-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.