createUserActionWithId
Creates a user action. This action cannot be taken on a user until this call successfully returns. Anytime after that the user action can be applied to any user.
This record as markdown: /tools/io-fusionauth-mcp-api/createuseractionwithid.md
What createUserActionWithId does on Fusionauth
AI agents use createUserActionWithId 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.
Why createUserActionWithId is rated Medium
This tool creates user actions (write operation), which are reversible configurations that can later be applied to users. It is Write rather than Execute because it does not directly perform actions on users—it merely establishes the action definition itself. It is not Destructive since creation is reversible.
From the tool's definition Tool description states 'Creates a user action' — a write operation that establishes new data (a user action) that persists and can subsequently be applied to users. The word 'Creates' directly indicates data creation.
Attacks that exploit this kind of access
The rule that runs createUserActionWithId 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 createUserActionWithId, this is the rule to start with:
createUserActionWithId 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Fusionauth, apply this rule, and every createUserActionWithId call is checked against it from then on.
Questions about createUserActionWithId
Creates a user action. This action cannot be taken on a user until this call successfully returns. Anytime after that the user action can be applied to any 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.
Register the Fusionauth MCP server in PolicyLayer and add a rule for createUserActionWithId: 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.
createUserActionWithId is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the createUserActionWithId 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.
Set action: deny in the PolicyLayer policy for createUserActionWithId. 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.
createUserActionWithId 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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