createMessageTemplate

Creates an message template. You can optionally specify an Id for the template, 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/createmessagetemplate.md

WHAT IT DOES

What createMessageTemplate does on Fusionauth

AI agents use createMessageTemplate 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 createMessageTemplate is rated Medium

This tool creates a new message template resource in FusionAuth. While creation is reversible (templates can be deleted), it modifies system state by adding new data. This is a Write operation with medium severity because misuse could flood the system with unwanted templates or create templates with malicious content (e.g., phishing messages), but the blast radius is limited compared to destructive operations since…

From the tool's definition Tool name is 'createMessageTemplate' and description states 'Creates an message template'. The verb 'creates' indicates data is being added to the system.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

createMessageTemplate Rate-limited

createMessageTemplate 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": {
    "createMessageTemplate": {
      "limits": [
        {
          "counter": "createmessagetemplate_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 createMessageTemplate call is checked against it from then on.

FAQ

Questions about createMessageTemplate

What does the createMessageTemplate tool do? +

Creates an message template. You can optionally specify an Id for the template, 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 createMessageTemplate? +

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

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

Can I rate-limit createMessageTemplate? +

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

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

createMessageTemplate 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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