Search clinical trials related to a health condition via PubMed. Finds clinical trial publications matching the condition and optional intervention. Returns trial titles, authors, and PubMed IDs. Args: condition: The health condition or disease (e.g. 'type 2 diabetes', 'breast cancer', 'depressio...
Part of the Cochrane Medical Reviews server.
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AI agents call search_clinical_trials to retrieve information from Cochrane Medical Reviews without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though search_clinical_trials only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"search_clinical_trials": {}
}
}See the full Cochrane Medical Reviews policy for all 3 tools.
These attack patterns abuse exactly the kind of access search_clinical_trials gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Search clinical trials related to a health condition via PubMed. Finds clinical trial publications matching the condition and optional intervention. Returns trial titles, authors, and PubMed IDs. Args: condition: The health condition or disease (e.g. 'type 2 diabetes', 'breast cancer', 'depression'). intervention: Optional treatment or intervention to include in search (e.g. 'metformin', 'cognitive behavioral therapy'). limit: Maximum number of results to return (default 20, max 100).. It is categorised as a Read tool in the Cochrane Medical Reviews MCP Server, which means it retrieves data without modifying state.
Register the Cochrane Medical Reviews MCP server in PolicyLayer and add a rule for search_clinical_trials: 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 Cochrane Medical Reviews. Nothing to install.
search_clinical_trials 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_clinical_trials 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_clinical_trials. 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_clinical_trials is provided by the Cochrane Medical Reviews MCP server (https://mcp.olyport.com/cochrane/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 3 Cochrane Medical Reviews tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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