createEntityType

Creates a Entity Type. You can optionally specify an Id for the Entity Type, if not provided one will be generated.

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/createentitytype.md

WHAT IT DOES

What createEntityType does on Fusionauth

AI agents use createEntityType 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 createEntityType is rated Medium

This is a Write operation—it creates new data structures (Entity Types) in the FusionAuth system. The operation is reversible (created Entity Types can be deleted or modified). It is not Execute (doesn't run arbitrary code), Destructive (doesn't irreversibly delete), or Financial.

From the tool's definition Tool creates a new Entity Type in FusionAuth; description explicitly states 'Creates a Entity Type' with optional Id specification, indicating data creation that modifies the system state.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

createEntityType Rate-limited

createEntityType 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": {
    "createEntityType": {
      "limits": [
        {
          "counter": "createentitytype_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 createEntityType call is checked against it from then on.

FAQ

Questions about createEntityType

What does the createEntityType tool do? +

Creates a Entity Type. You can optionally specify an Id for the Entity Type, if not provided one will be generated. 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 createEntityType? +

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

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

Can I rate-limit createEntityType? +

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

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

createEntityType 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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