AI agents may call unbookmark_tweet to permanently remove or destroy resources in Xbird. Without a policy, an autonomous agent could delete critical data in a loop with no way to undo the damage. PolicyLayer blocks destructive tools by default and requires explicit human approval before enabling them.
Without a policy, an AI agent could call unbookmark_tweet in a loop, permanently destroying resources in Xbird. There is no undo for destructive operations. PolicyLayer blocks this tool by default and only allows it when a human explicitly approves the action.
Destructive tools permanently remove data. Block by default. Only enable with explicit approval workflows.
{
"version": "1",
"default": "deny",
"hide": [
"unbookmark_tweet"
]
}See the full Xbird policy for all 34 tools.
These attack patterns abuse exactly the kind of access unbookmark_tweet gives an agent. Each links to the full case and the policy that stops it:
Other destructive tools across the catalogue. The same approach applies to each: deny by default, or require human approval.
Remove a tweet bookmark. It is categorised as a Destructive tool in the Xbird MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Xbird MCP server in PolicyLayer and add a rule for unbookmark_tweet: 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 Xbird. Nothing to install.
unbookmark_tweet 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 unbookmark_tweet 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 unbookmark_tweet. 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.
unbookmark_tweet is provided by the Xbird MCP server (checkra1neth/xbirdmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 34 Xbird tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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