finish_session

THE RISK

Critical Risk

Why finish_session needs a policy

This tool initiates the checkout/payment flow by navigating to the payment page, directly enabling financial transactions (purchasing groceries). While it may require manual user confirmation to complete payment, it places the user in the payment flow, making it Financial in category. Misuse could lead to unintended purchases, hence critical severity.

From the tool's definition Opens the browser at the checkout page so you can select a delivery time and pay

Documented attack patterns abuse exactly the kind of access finish_session gives an agent:

POLICY

How to control finish_session

PolicyLayer is an MCP gateway — it sits between your AI agents and Frisco MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for finish_session:

policy.json

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

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

Create a free account and register Frisco MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More Frisco MCP tools

Destructive clear_cart Empties the Frisco cart using the site Destructive clear_session Clears the saved session and closes the browser. Destructive remove_item_from_cart Removes a specific product from the Frisco cart by name (partial match supported). Execute login Opens a visible Chromium browser to log in to Frisco manually. Run this first to establish Write add_items_to_cart Adds products to cart by selecting from the most recent search_products result page. No ad Write update_item_quantity Changes the quantity of a product already in the cart (partial name match supported). Read check_cart_issues Checks the cart for sold-out or unavailable products and lists available substitutes for e Read get_logs Returns persisted JSONL log events for the current or selected session.

All 15 Frisco MCP tools →

Financial tools on other servers

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Go deeper

Critical-risk tools in Frisco MCP → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about finish_session

What does the finish_session tool do? +

Opens the browser at the checkout page so you can select a delivery time and pay. It is categorised as a Financial tool in the Frisco MCP MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on finish_session? +

Register the Frisco MCP server in PolicyLayer and add a rule for finish_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 Frisco MCP. Nothing to install.

What risk level is finish_session? +

finish_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 finish_session? +

Yes. Add a rate_limit block to the finish_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 finish_session completely? +

Set action: deny in the PolicyLayer policy for finish_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 finish_session? +

finish_session is provided by the Frisco MCP server (mkidawa/frisco-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Frisco MCP tool call.

Start from Frisco MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →