Get statistics about clinical trials
AI agents call get_study_statistics to retrieve information from ClinicalTrials 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 aggregated statistical information about clinical trials from ClinicalTrials.gov. It performs a query operation that returns computed metrics or summaries without creating, modifying, deleting, or executing any external operations. The data accessed is public clinical trial metadata and computed statistics, posing minimal security risk. Classification as Read is appropriate.
From the tool's definition Tool name is 'get_study_statistics' and description states 'Get statistics about clinical trials'. The verb 'Get' combined with 'statistics' indicates data retrieval with no modification or side effects.
Documented attack patterns abuse exactly the kind of access get_study_statistics gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and ClinicalTrials MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_study_statistics:
{
"version": "1",
"default": "deny",
"tools": {
"get_study_statistics": {}
}
}get_study_statistics is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get statistics about clinical trials. It is categorised as a Read tool in the ClinicalTrials MCP Server MCP Server, which means it retrieves data without modifying state.
Register the ClinicalTrials MCP Server MCP server in PolicyLayer and add a rule for get_study_statistics: 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 ClinicalTrials MCP Server. Nothing to install.
get_study_statistics 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_study_statistics 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_study_statistics. 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_study_statistics is provided by the ClinicalTrials MCP Server MCP server (jackkuo666/clinicaltrials-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from ClinicalTrials MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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7 ClinicalTrials MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.