Delete a Gemini CLI session by index number.
AI agents call gemini_delete_session to permanently remove resources in Gemini CLI MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently removes a session, which cannot be undone. While the blast radius is somewhat contained (only affects stored chat sessions rather than external data or systems), deletion of user data is irreversible and qualifies as Destructive. It is more severe than Write (which is reversible) and does not involve financial impact or code execution on external systems.
From the tool's definition The tool name is 'gemini_delete_session' and the description states it will 'Delete a Gemini CLI session by index number.' The verb 'Delete' and the irreversible nature of removing a session constitute a destructive action.
Attacks that exploit this kind of access
Delete a Gemini CLI session by index number. It is categorised as a Destructive tool in the Gemini CLI MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Gemini CLI MCP Server MCP server in PolicyLayer and add a rule for gemini_delete_session: 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 Gemini CLI MCP Server. Nothing to install.
gemini_delete_session 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 gemini_delete_session 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 gemini_delete_session. 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.
gemini_delete_session is provided by the Gemini CLI MCP Server MCP server (wminson/gemini_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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