Delete a list.
AI agents call list_delete to permanently remove resources in Mastodon — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Deleting a list is a destructive, irreversible action. Once a list is deleted, any organizational structure and membership associations are permanently lost. This warrants a high severity rating since an AI agent could mistakenly delete important curated lists that may be difficult or impossible to reconstruct.
From the tool's definition "Delete a list" — the tool explicitly deletes a list, which is an irreversible removal of data.
Attacks that exploit this kind of access
Delete a list. It is categorised as a Destructive tool in the Mastodon MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Mastodon MCP server in PolicyLayer and add a rule for list_delete: 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 Mastodon. Nothing to install.
list_delete 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 list_delete 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 list_delete. 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.
list_delete is provided by the Mastodon MCP server (vitexsoftware/mastodon-mcp-server). 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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