createTheme

Creates a Theme. You can optionally specify an Id for the theme, 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/createtheme.md

WHAT IT DOES

What createTheme does on Fusionauth

AI agents use createTheme 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 createTheme is rated Medium

This tool creates new data (themes) in the FusionAuth system. Theme creation is a Write operation because it generates new persistent data without irreversible consequences. Severity is medium because misconfigured themes could affect user experience or security posture, but can be deleted or modified afterward. Confidence is high because the 'Creates' verb and functional context clearly indicate a write operation.

From the tool's definition Tool description states 'Creates a Theme', which is a reversible create operation. The tool allows specifying an optional Id parameter to persist a new theme object in the FusionAuth system.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

createTheme Rate-limited

createTheme 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": {
    "createTheme": {
      "limits": [
        {
          "counter": "createtheme_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 createTheme call is checked against it from then on.

FAQ

Questions about createTheme

What does the createTheme tool do? +

Creates a Theme. You can optionally specify an Id for the theme, 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 createTheme? +

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

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

Can I rate-limit createTheme? +

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

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

createTheme 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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Guides

Govern customer-ops agents →Argument validation →Scoped token →