retrieveMessageTemplatePreviewWithId
Creates a preview of the message template provided in the request, normalized to a given locale.
This record as markdown: /tools/io-fusionauth-mcp-api/retrievemessagetemplatepreviewwithid.md
What retrieveMessageTemplatePreviewWithId does on Fusionauth
AI agents call retrieveMessageTemplatePreviewWithId to retrieve information from Fusionauth without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why retrieveMessageTemplatePreviewWithId is rated Low
This tool retrieves a computed preview of a message template for a specific locale. It performs no write, modification, deletion, or external execution. The primary action is to render and return template content, which is a read operation.
From the tool's definition 'Creates a preview of the message template provided in the request' – the tool generates a preview (read-only output) without modifying or persisting any data. The operation is non-destructive and returns computed/rendered content.
Attacks that exploit this kind of access
The rule that runs retrieveMessageTemplatePreviewWithId 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 retrieveMessageTemplatePreviewWithId, this is the rule to start with:
retrieveMessageTemplatePreviewWithId is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Fusionauth, apply this rule, and every retrieveMessageTemplatePreviewWithId call is checked against it from then on.
Questions about retrieveMessageTemplatePreviewWithId
Creates a preview of the message template provided in the request, normalized to a given locale. It is categorised as a Read tool in the Fusionauth MCP Server, which means it retrieves data without modifying state.
Register the Fusionauth MCP server in PolicyLayer and add a rule for retrieveMessageTemplatePreviewWithId: 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.
retrieveMessageTemplatePreviewWithId is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the retrieveMessageTemplatePreviewWithId 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 retrieveMessageTemplatePreviewWithId. 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.
retrieveMessageTemplatePreviewWithId 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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