createTenant

Creates a tenant. You can optionally specify an Id for the tenant, 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/createtenant.md

WHAT IT DOES

What createTenant does on Fusionauth

AI agents use createTenant 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 createTenant is rated Medium

Creating a tenant is a write operation that persistently adds a new entity to the system. It is reversible (a tenant can be deleted), so it does not qualify as Destructive. However, in a multi-tenant identity/authentication system like FusionAuth, creating a tenant is a significant action with potentially broad blast radius: a new tenant represents a new isolated security boundary, namespace, and billing entity.

From the tool's definition Tool description states 'Creates a tenant' — this is a create operation that generates a new organizational entity in FusionAuth. The optional Id parameter allows customization of the created resource.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

createTenant Rate-limited

createTenant 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": {
    "createTenant": {
      "limits": [
        {
          "counter": "createtenant_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 createTenant call is checked against it from then on.

FAQ

Questions about createTenant

What does the createTenant tool do? +

Creates a tenant. You can optionally specify an Id for the tenant, 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 createTenant? +

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

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

Can I rate-limit createTenant? +

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

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

createTenant 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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