commentOnUserWithId

Adds a comment to the user

SERVERFusionauth SOURCE@fusionauth/mcp-api

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-fusionauth-mcp-api/commentonuserwithid.md

WHAT IT DOES

What commentOnUserWithId does on Fusionauth

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

RISK

Why commentOnUserWithId is rated Medium

Adding a comment is a write operation that creates new data without irreversible deletion or financial impact. The 'WithId' suffix indicates it operates on a specific user by identifier. Severity is medium because malicious comments could harass users or pollute audit trails, but the action is reversible (comments can be deleted) and does not directly compromise core identity or access controls.

From the tool's definition Tool description states 'Adds a comment to the user' — this creates new data (a comment) associated with a user record, modifying the user's profile or history reversibly.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs commentOnUserWithId safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Fusionauth, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For commentOnUserWithId, this is the rule to start with:

commentOnUserWithId Rate-limited

commentOnUserWithId 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": {
    "commentOnUserWithId": {
      "limits": [
        {
          "counter": "commentonuserwithid_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Fusionauth, apply this rule, and every commentOnUserWithId call is checked against it from then on.

FAQ

Questions about commentOnUserWithId

What does the commentOnUserWithId tool do? +

Adds a comment to the user. It is categorised as a Write tool in the Fusionauth MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on commentOnUserWithId? +

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

What risk level is commentOnUserWithId? +

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

Can I rate-limit commentOnUserWithId? +

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

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

commentOnUserWithId is provided by the Fusionauth MCP server (@fusionauth/mcp-api). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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