end_session · Luxxon MCP: Risk & Policy

WHAT IT DOES

What end_session does on Luxxon

AI agents use end_session to commit financial operations through Luxxon — usually the final step of a payment, billing, or trading workflow. A call moves real money.

WHY IT NEEDS A POLICY

Why end_session needs a policy

Ending a live session triggers an on-chain financial settlement in USDC on Base, committing a financial obligation based on the number of seconds used. This is a financial action because it finalizes and settles payment, making it the most severe applicable category.

From the tool's definition Closes the meter; computes cleanSeconds; the relayer settles on-chain shortly after

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

end_session Approval-gated

Any call to end_session is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "end_session": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Luxxon, so you can run agents against it safely.

FAQ

Questions about end_session

What does the end_session tool do? +

End a LIVE Luxxon session. Closes the meter; computes cleanSeconds; the relayer settles on-chain shortly after. For pre-LIVE sessions use cancel_session instead. It is categorised as a Financial tool in the Luxxon MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on end_session? +

Register the Luxxon MCP server in PolicyLayer and add a rule for end_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 Luxxon. Nothing to install.

What risk level is end_session? +

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

Can I rate-limit end_session? +

Yes. Add a rate_limit block to the end_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.

How do I block end_session completely? +

Set action: deny in the PolicyLayer policy for end_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.

What MCP server provides end_session? +

end_session is provided by the Luxxon MCP server (luxxon-dev/luxxon-sdk). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.