Unblock a user.
AI agents call delete_block to permanently remove resources in Groupme — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Deleting a block is an irreversible removal of a block record (the original block is destroyed). While unblocking may seem benign, it permanently removes the block that was in place, which could expose a user to unwanted contact and cannot be automatically undone. This maps to Destructive rather than Write because the action destroys an existing record.
From the tool's definition 'delete_block' and 'Unblock a user' — removes an existing block relationship
Attacks that exploit this kind of access
Unblock a user. It is categorised as a Destructive tool in the Groupme MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Groupme MCP server in PolicyLayer and add a rule for delete_block: 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 Groupme. Nothing to install.
delete_block 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 delete_block 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 delete_block. 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.
delete_block is provided by the Groupme MCP server (kalebjs/groupme-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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