Look up Taiwan NHI drug payment rules (藥品給付規定) — when a drug class is / isn
AI agents call get_drug_rules 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 (drug payment rules from Taiwan's National Health Insurance system) without modifying, executing, or deleting anything. It is a simple read operation with no capability to alter state or trigger external actions.
From the tool's definition Tool name 'get_drug_rules' and description 'Look up Taiwan NHI drug payment rules' indicate a lookup/query operation with no side effects. The description is truncated ('when a drug class is / isn') but the verb 'Look up' clearly indicates retrieval.
Attacks that exploit this kind of access
Look up Taiwan NHI drug payment rules (藥品給付規定) — when a drug class is / isn. 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 get_drug_rules: 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.
get_drug_rules 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_drug_rules 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_drug_rules. 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_drug_rules 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.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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