createUserActionReason

Creates a user reason. This user action reason cannot be used when actioning a user until this call completes successfully. Anytime after that the user action reason can be used.

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/createuseractionreason.md

WHAT IT DOES

What createUserActionReason does on Fusionauth

AI agents use createUserActionReason 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 createUserActionReason is rated Medium

This tool creates a new user action reason resource in FusionAuth, which is a write operation that modifies system state by adding new data. While write operations are generally reversible (the reason can presumably be deleted or updated), the creation of action reasons could impact user management workflows if misconfigured.

From the tool's definition Tool description states it 'Creates a user reason' — a data creation operation with no indication of deletion or reversibility constraints.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

createUserActionReason Rate-limited

createUserActionReason 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": {
    "createUserActionReason": {
      "limits": [
        {
          "counter": "createuseractionreason_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 createUserActionReason call is checked against it from then on.

FAQ

Questions about createUserActionReason

What does the createUserActionReason tool do? +

Creates a user reason. This user action reason cannot be used when actioning a user until this call completes successfully. Anytime after that the user action reason can be used. 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 createUserActionReason? +

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

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

Can I rate-limit createUserActionReason? +

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

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

createUserActionReason 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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