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.
This record as markdown: /tools/sankahq-sanka-mcp/select-buy-offer.md
What select_buy_offer does on Sanka MCP Server
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.
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 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
Attacks that exploit this kind of access
The rule that runs select_buy_offer safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Sanka MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For select_buy_offer, this is the rule to start with:
Any call to select_buy_offer is blocked until a human approves it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect Sanka MCP Server, apply this rule, and every select_buy_offer call is checked against it from then on.
Questions about 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. It is categorised as a Financial tool in the Sanka MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Sanka MCP Server MCP server in PolicyLayer and add a rule for select_buy_offer: 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 Sanka MCP Server. Nothing to install.
select_buy_offer is a Financial 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 select_buy_offer 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 select_buy_offer. 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.
select_buy_offer is provided by the Sanka MCP Server MCP server (sankahq/sanka-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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