AI agents call list_former_groups to retrieve information from Groupme without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries historical group membership data and returns information without creating, modifying, or deleting any data. It is a straightforward read operation on the user's group history with minimal security risk.
From the tool's definition Tool name 'list_former_groups' and description 'List groups the authenticated user has previously left' indicate a retrieval operation with no modification capability.
Attacks that exploit this kind of access
List groups the authenticated user has previously left. It is categorised as a Read tool in the Groupme MCP Server, which means it retrieves data without modifying state.
Register the Groupme MCP server in PolicyLayer and add a rule for list_former_groups: 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.
list_former_groups is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_former_groups 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_former_groups. 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_former_groups 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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