Compute complete bill breakdown for a patient.
AI agents call get_total_cost to retrieve information from MCPDischarge without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and computes billing data (a read operation) rather than executing payment transactions, creating charges, or destructively modifying records. While it accesses sensitive PHI in a hospital discharge system, the core function is non-destructive data retrieval and calculation. The severity is low because misuse would expose information rather than cause irreversible harm or financial loss.
From the tool's definition Tool name 'get_total_cost' and description 'Compute complete bill breakdown for a patient' indicates retrieval and calculation of billing information without modifying financial data or committing payment obligations.
Attacks that exploit this kind of access
Compute complete bill breakdown for a patient. It is categorised as a Read tool in the MCPDischarge MCP Server, which means it retrieves data without modifying state.
Register the MCPDischarge MCP server in PolicyLayer and add a rule for get_total_cost: 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 MCPDischarge. Nothing to install.
get_total_cost 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 get_total_cost 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 get_total_cost. 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.
get_total_cost is provided by the MCPDischarge MCP server (prashantsingh1234/mcp_project). 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.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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