Remove a decal by index.
AI agents call remove_decal to permanently remove resources in Loenn — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Removing a decal from a map file by index is a destructive operation; once removed, the decal and its configuration are gone and cannot be recovered without a prior backup. Given this server operates on Celeste .bin map files without the Lönn editor, there is no implicit undo mechanism described, making this a Destructive action with high severity due to potential permanent loss of map content.
From the tool's definition 'Remove a decal by index' — the tool deletes a decal element from the map file by its index position, which is an irreversible removal of map data.
Attacks that exploit this kind of access
Remove a decal by index. It is categorised as a Destructive tool in the Loenn MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Loenn MCP server in PolicyLayer and add a rule for remove_decal: 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 Loenn. Nothing to install.
remove_decal 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 remove_decal 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 remove_decal. 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.
remove_decal is provided by the Loenn MCP server (magedeline/loenn-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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