patchMessageTemplateWithId

Updates, via PATCH, the message template with the given Id.

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/patchmessagetemplatewithid.md

WHAT IT DOES

What patchMessageTemplateWithId does on Fusionauth

AI agents use patchMessageTemplateWithId 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 patchMessageTemplateWithId is rated Medium

This tool creates or modifies data reversibly by updating a message template. It is Write rather than Execute because it does not run arbitrary code or trigger external operations—it only modifies a specific template resource. However, severity is high because message templates are trust-critical infrastructure; a compromised template could be used to deceive users or intercept credentials.

From the tool's definition Tool description states 'Updates, via PATCH, the message template with the given Id' — PATCH is a standard HTTP method for modifying existing resources.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

patchMessageTemplateWithId Rate-limited

patchMessageTemplateWithId 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": {
    "patchMessageTemplateWithId": {
      "limits": [
        {
          "counter": "patchmessagetemplatewithid_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 patchMessageTemplateWithId call is checked against it from then on.

FAQ

Questions about patchMessageTemplateWithId

What does the patchMessageTemplateWithId tool do? +

Updates, via PATCH, the message template with the given Id. 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 patchMessageTemplateWithId? +

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

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

Can I rate-limit patchMessageTemplateWithId? +

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

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

patchMessageTemplateWithId 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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