deleteMessageTemplateWithId
Deletes the message template for the given Id.
This record as markdown: /tools/io-fusionauth-mcp-api/deletemessagetemplatewithid.md
What deleteMessageTemplateWithId does on Fusionauth
AI agents call deleteMessageTemplateWithId to permanently remove resources in Fusionauth, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Why deleteMessageTemplateWithId is rated Critical
This tool performs an irreversible deletion of data (a message template). Deletion cannot be undone and will impact any systems or workflows that depend on that template. The high severity reflects the potential for an AI agent to inadvertently delete critical message templates used for user communications (welcome emails, password resets, notifications, etc.), causing service disruption.
From the tool's definition The tool name explicitly contains "delete" and the description states "Deletes the message template for the given Id." This operation is irreversible—once a message template is deleted, it cannot be recovered without a backup.
Attacks that exploit this kind of access
The rule that runs deleteMessageTemplateWithId 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 deleteMessageTemplateWithId, this is the rule to start with:
deleteMessageTemplateWithId is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect Fusionauth, apply this rule, and every deleteMessageTemplateWithId call is checked against it from then on.
Questions about deleteMessageTemplateWithId
Deletes the message template for the given Id. It is categorised as a Destructive tool in the Fusionauth MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Fusionauth MCP server in PolicyLayer and add a rule for deleteMessageTemplateWithId: 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.
deleteMessageTemplateWithId is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the deleteMessageTemplateWithId 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.
Set action: deny in the PolicyLayer policy for deleteMessageTemplateWithId. 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.
deleteMessageTemplateWithId 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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