Dismiss (clear) a single notification.
AI agents call notification_dismiss 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.
Dismissing/clearing a notification is an irreversible action — once cleared, the notification is gone and cannot be recovered. This maps to the Destructive category. The blast radius is medium since it only affects notifications (not content or accounts), but the action cannot be undone.
From the tool's definition Dismiss (clear) a single notification
Attacks that exploit this kind of access
Dismiss (clear) a single notification. 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 notification_dismiss: 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.
notification_dismiss 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 notification_dismiss 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 notification_dismiss. 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.
notification_dismiss 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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