buy_credit_pack
AI agents use buy_credit_pack to commit financial operations through Sablier MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
The name 'buy_credit_pack' indicates a purchase action, which constitutes a financial transaction. Even without a description, 'buy' in any financial/fintech context implies spending money or committing financial obligations. This falls squarely in the Financial category with critical severity because an AI agent misusing this tool could trigger unintended purchases.
From the tool's definition Tool name 'buy_credit_pack' — 'buy' strongly implies a financial transaction committing monetary obligation; description is empty and uninformative.
Attacks that exploit this kind of access
buy_credit_pack. It is categorised as a Financial tool in the Sablier MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Sablier MCP Server MCP server in PolicyLayer and add a rule for buy_credit_pack: 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 Sablier MCP Server. Nothing to install.
buy_credit_pack 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 buy_credit_pack 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 buy_credit_pack. 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.
buy_credit_pack is provided by the Sablier MCP Server MCP server (sablier-ai/sablier-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
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