AI agents call retrieve_lightning_charges to retrieve information from Zbd without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only operation that queries and returns data about a Lightning charge. However, the 'medium' severity reflects that Lightning charges in payment/financial systems typically contain sensitive transactional data (amounts, dates, payment status, user identifiers). Unauthorized retrieval of such data could expose financial information, though the tool itself performs no destructive or financial actions.
From the tool's definition Tool name 'retrieve_lightning_charges' and description 'Retrieve all data about a single Charge' indicate a data retrieval operation with no modification capability.
Attacks that exploit this kind of access
Retrieve all data about a single Charge. It is categorised as a Read tool in the Zbd MCP Server, which means it retrieves data without modifying state.
Register the Zbd MCP server in PolicyLayer and add a rule for retrieve_lightning_charges: 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 Zbd. Nothing to install.
retrieve_lightning_charges is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the retrieve_lightning_charges 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 retrieve_lightning_charges. 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.
retrieve_lightning_charges is provided by the Zbd MCP server (zebedeeio/zbd-payments-typescript-sdk). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
retrieve_lightning_charges is one line of Zbd's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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