Search hospital formulary by drug name or code.
AI agents call search_formulary to retrieve information from Pharmacy MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves drug information from a hospital formulary database without modifying, deleting, or executing any operations. It has no side effects and presents minimal risk even if misused by an AI agent, as it only returns reference data. The worst-case scenario is retrieving incorrect or irrelevant formulary information, which does not harm data integrity or enable harmful actions.
From the tool's definition Tool is explicitly described as 'Search hospital formulary by drug name or code' — a retrieval operation with no modification, deletion, or execution capability. The action verb is 'search', which is a read-only query.
Attacks that exploit this kind of access
Search hospital formulary by drug name or code. It is categorised as a Read tool in the Pharmacy MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Pharmacy MCP Server MCP server in PolicyLayer and add a rule for search_formulary: 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 Pharmacy MCP Server. Nothing to install.
search_formulary 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 search_formulary 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 search_formulary. 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.
search_formulary is provided by the Pharmacy MCP Server MCP server (u9401066/pharmacy-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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