This record as markdown: /tools/io-fusionauth-mcp-api/deletethemewithid.md
What deleteThemeWithId does on Fusionauth
AI agents call deleteThemeWithId 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 deleteThemeWithId is rated Critical
This tool performs an irreversible deletion operation on a theme resource identified by its ID. Deletion cannot be undone without restoration from backups. The blast radius depends on how widely the theme is used in the FusionAuth system (e.g., if it's applied to multiple applications or tenants), but the action itself is inherently destructive and non-recoverable, warranting the Destructive category and high…
From the tool's definition Tool name contains 'delete' and description states 'Deletes the theme for the given Id.' The verb 'deletes' explicitly indicates irreversible removal of data.
Attacks that exploit this kind of access
The rule that runs deleteThemeWithId 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 deleteThemeWithId, this is the rule to start with:
deleteThemeWithId 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 deleteThemeWithId call is checked against it from then on.
Questions about deleteThemeWithId
Deletes the theme 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 deleteThemeWithId: 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.
deleteThemeWithId 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 deleteThemeWithId 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 deleteThemeWithId. 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.
deleteThemeWithId 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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