# select_buy_offer

Select one immutable offer snapshot per Buy request line. Multi-line and multi-merchant requests must pass line_selections so downstream merchant purchases can be split correctly. Pass acknowledge_fee=true only after the buyer explicitly accepts a quoted Cargo success fee.

Agent View of the PolicyLayer registry record for `select_buy_offer`. HTML page: https://policylayer.com/tools/sankahq-sanka-mcp/select-buy-offer

## Facts

- Tool: `select_buy_offer`
- Server: Sanka MCP Server (`sankahq/sanka-mcp`) — https://policylayer.com/tools/sankahq-sanka-mcp.md
- Homepage: https://github.com/sankaHQ/sanka-mcp
- Risk category: Financial (Critical risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Approval-gated

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "select_buy_offer",
    "arguments": {}
  }
}
```

## Why select_buy_offer is rated Critical

This tool commits to purchasing offers and acknowledges financial fees, directly initiating or locking in financial transactions with merchants. The immutable nature of the offer snapshot and the explicit fee acknowledgment confirm this is a Financial action with critical severity, as misuse could result in unintended purchases or financial commitments across multiple merchants.

From the tool's own definition: "Select one immutable offer snapshot per Buy request line... downstream merchant purchases can be split correctly... acknowledge_fee=true only after the buyer explicitly accepts a quoted Cargo success fee"

## Use case

AI agents use select_buy_offer to commit financial operations through Sanka MCP Server, usually the final step of a payment, billing, or trading workflow. A call moves real money.

## Recommended policy (PolicyLayer)

Verdict: **Approval-gated**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Sanka MCP Server:

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

## Other tools on Sanka MCP Server (348)

- `cancel_buy_request` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/cancel-buy-request.md
- `cancel_export_job` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/cancel-export-job.md
- `cancel_import_job` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/cancel-import-job.md
- `cancel_workspace_invitation` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/cancel-workspace-invitation.md
- `delete_absence` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-absence.md
- `delete_approval_rule` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-approval-rule.md
- `delete_association` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-association.md
- `delete_attendance_record` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-attendance-record.md
- `delete_bill` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-bill.md
- `delete_company` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-company.md
- `delete_contact` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-contact.md
- `delete_deal` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-deal.md
- `delete_delivery_rule` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-delivery-rule.md
- `delete_disbursement` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-disbursement.md
- `delete_disbursement_allocation` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-disbursement-allocation.md
- `delete_estimate` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-estimate.md
- `delete_expense` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-expense.md
- `delete_ferry_diagram` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-ferry-diagram.md
- `delete_ferry_todo` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-ferry-todo.md
- `delete_inventory` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-inventory.md
- `delete_inventory_transaction` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-inventory-transaction.md
- `delete_invoice` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-invoice.md
- `delete_item` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-item.md
- `delete_location` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-location.md
- `delete_lock_rule` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-lock-rule.md
- `delete_order` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-order.md
- `delete_payment` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-payment.md
- `delete_project` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-project.md
- `delete_property` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-property.md
- `delete_purchase_order` — Destructive — https://policylayer.com/tools/sankahq-sanka-mcp/delete-purchase-order.md
- …and 318 more: https://policylayer.com/tools/sankahq-sanka-mcp.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

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Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=sankahq-sanka-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/sankahq-sanka-mcp