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.
AI agents use select_buy_offer to create or update resources in Sanka MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Sanka MCP Server environment.
The tool creates or modifies purchase request data by selecting and locking in offer snapshots for buy orders. While it doesn't immediately execute payment (which would be Financial), it commits the buyer to specific terms and prices that drive downstream financial transactions. The term 'immutable offer snapshot' indicates this selection has permanent consequences for the transaction.
From the tool's definition Tool description states 'Select one immutable offer snapshot per Buy request line' and mentions 'downstream merchant purchases can be split correctly', indicating it modifies purchase order state by selecting/committing to specific offer terms.
Attacks that exploit this kind of access
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. It is categorised as a Write tool in the Sanka MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
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 Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
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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