clear_conversation · NanoBanana MCP: Risk & Policy

WHAT IT DOES

What clear_conversation does on NanoBanana MCP

AI agents call clear_conversation to permanently remove resources in NanoBanana MCP — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.

WHY IT NEEDS A POLICY

Why clear_conversation needs a policy

Clearing conversation history is an irreversible deletion of data (the conversation history). Once cleared, the history cannot be recovered, making this a destructive operation. The blast radius is medium since it only affects conversation history within this specific MCP server, not broader system data.

From the tool's definition Clear conversation history for a specific conversation ID

Attacks that exploit this kind of access

Questions about clear_conversation

What does the clear_conversation tool do? +

Clear conversation history for a specific conversation ID. It is categorised as a Destructive tool in the NanoBanana MCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on clear_conversation? +

Register the NanoBanana MCP server in PolicyLayer and add a rule for clear_conversation: 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 NanoBanana MCP. Nothing to install.

What risk level is clear_conversation? +

clear_conversation is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit clear_conversation? +

Yes. Add a rate_limit block to the clear_conversation 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.

How do I block clear_conversation completely? +

Set action: deny in the PolicyLayer policy for clear_conversation. 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.

What MCP server provides clear_conversation? +

clear_conversation is provided by the NanoBanana MCP server (pistachiomatt/nanobanana-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.