AI agents call reset_session to permanently remove resources in Gemini — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Resetting/clearing a session irreversibly destroys session state, conversation history, and context. This action cannot be undone — the session data is gone once cleared. This qualifies as Destructive rather than Write because the operation is not reversible.
From the tool's definition Reset (clear) the ACP session for a workspace
Documented attack patterns abuse exactly the kind of access reset_session gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Gemini, and nothing reaches the server without passing your rules. This is the rule we recommend for reset_session:
{
"version": "1",
"default": "deny",
"hide": [
"reset_session"
]
}reset_session disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
Free to start. No card required.
Reset (clear) the ACP session for a workspace. It is categorised as a Destructive tool in the Gemini MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Gemini MCP server in PolicyLayer and add a rule for reset_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. Nothing to install.
reset_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 reset_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 reset_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.
reset_session is provided by the Gemini MCP server (shenyunhuan/gemini_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 Gemini tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4 Gemini tools catalogued and risk-classified — across an index of 42,500+ MCP servers.