Get mappings for a specific RxCUI
AI agents call get_mappings_by_rxcui to retrieve information from DailyMed 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 reference data mappings from a public FDA database without creating, modifying, deleting, or executing any operations. It is a simple data query with no side effects, fitting the 'Read' category. Severity is low because misuse would only expose publicly available pharmaceutical reference information.
From the tool's definition Tool name 'get_mappings_by_rxcui' and description 'Get mappings for a specific RxCUI' indicate a retrieval operation.
Attacks that exploit this kind of access
Get mappings for a specific RxCUI. It is categorised as a Read tool in the DailyMed MCP Server MCP Server, which means it retrieves data without modifying state.
Register the DailyMed MCP Server MCP server in PolicyLayer and add a rule for get_mappings_by_rxcui: 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 DailyMed MCP Server. Nothing to install.
get_mappings_by_rxcui 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_mappings_by_rxcui 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_mappings_by_rxcui. 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_mappings_by_rxcui is provided by the DailyMed MCP Server MCP server (rowanerasmus/dailymed-mcp-server). 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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