createEntityWithId

Creates an Entity. You can optionally specify an Id for the Entity. 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/createentitywithid.md

WHAT IT DOES

What createEntityWithId does on Fusionauth

AI agents use createEntityWithId 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 createEntityWithId is rated Medium

This tool creates new entities in FusionAuth, modifying state by adding records. It is reversible (entities can be deleted), so it is Write rather than Destructive. The severity is medium because entity creation could populate a system with unwanted data or create security/privacy issues if misused, but the impact is contained to entity records rather than system-wide data or financial transactions.

From the tool's definition Tool description states 'Creates an Entity' with optional Id specification. The verb 'Creates' and action of generating new resources without deletion or financial implications indicates a write operation.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

createEntityWithId Rate-limited

createEntityWithId 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": {
    "createEntityWithId": {
      "limits": [
        {
          "counter": "createentitywithid_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 createEntityWithId call is checked against it from then on.

FAQ

Questions about createEntityWithId

What does the createEntityWithId tool do? +

Creates an Entity. You can optionally specify an Id for the Entity. 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 createEntityWithId? +

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

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

Can I rate-limit createEntityWithId? +

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

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

createEntityWithId 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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