AI agents call unrepost to permanently remove resources in Bluesky — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Removing a repost deletes a previously created repost record on Bluesky. While not catastrophic (the original post remains), the repost itself is irreversibly removed without a clear undo mechanism, placing it in the Destructive category. Severity is medium because it only affects the user's own repost, not others' content.
From the tool's definition 'Remove your repost' — this action undoes/removes a repost, which is a deletion of an existing social action
Documented attack patterns abuse exactly the kind of access unrepost gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Bluesky, and nothing reaches the server without passing your rules. This is the rule we recommend for unrepost:
{
"version": "1",
"default": "deny",
"hide": [
"unrepost"
]
}unrepost disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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Remove your repost. It is categorised as a Destructive tool in the Bluesky MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Bluesky MCP server in PolicyLayer and add a rule for unrepost: 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 Bluesky. Nothing to install.
unrepost 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 unrepost 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 unrepost. 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.
unrepost is provided by the Bluesky MCP server (semioz/bluesky-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Bluesky, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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11 Bluesky tools catalogued and risk-classified — across an index of 43,000+ MCP servers.