Look up the Taiwan NHI fee schedule (全民健康保險醫療服務給付項目及支付標準, current effective edition). Search by exact code (e.g.
AI agents call lookup_fee_code to retrieve information from Opdstar Nhi without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves reference data (fee schedule information) based on a fee code query. It performs a lookup operation without modifying, executing, or deleting any data. The blast radius of misuse is minimal — an agent could only retrieve fee information that is already public administrative data. This is a straightforward Read category tool.
From the tool's definition Tool description states 'Look up the Taiwan NHI fee schedule' — a search operation that retrieves data from a fee schedule reference.
Attacks that exploit this kind of access
Look up the Taiwan NHI fee schedule (全民健康保險醫療服務給付項目及支付標準, current effective edition). Search by exact code (e.g. It is categorised as a Read tool in the Opdstar Nhi MCP Server, which means it retrieves data without modifying state.
Register the Opdstar Nhi MCP server in PolicyLayer and add a rule for lookup_fee_code: 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 Opdstar Nhi. Nothing to install.
lookup_fee_code 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 lookup_fee_code 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 lookup_fee_code. 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.
lookup_fee_code is provided by the Opdstar Nhi MCP server (tatsuju/opdstar-nhi-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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