actionUserWithId

Takes an action on a user. The user being actioned is called the

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/actionuserwithid.md

WHAT IT DOES

What actionUserWithId does on Fusionauth

AI agents use actionUserWithId 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 actionUserWithId is rated Medium

This tool applies a moderation or administrative action to a user account. Such actions (e.g., locking, suspending, warning) are Write operations that modify user state. They are potentially reversible (actions can typically be cancelled, as evidenced by the sibling 'cancelActionWithId' tool). The blast radius is high because misuse could affect user access and account status.

From the tool's definition 'Takes an action on a user' - modifies user state by applying an action (e.g., lock, warn, suspend)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs actionUserWithId 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 actionUserWithId, this is the rule to start with:

actionUserWithId Rate-limited

actionUserWithId 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": {
    "actionUserWithId": {
      "limits": [
        {
          "counter": "actionuserwithid_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 actionUserWithId call is checked against it from then on.

FAQ

Questions about actionUserWithId

What does the actionUserWithId tool do? +

Takes an action on a user. The user being actioned is called the. 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 actionUserWithId? +

Register the Fusionauth MCP server in PolicyLayer and add a rule for actionUserWithId: 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 actionUserWithId? +

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

Can I rate-limit actionUserWithId? +

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

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

actionUserWithId 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.

KEEP EXPLORING

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