Search for patients within the current workspace using a text prefix. The prefix is matched against patient username, mobile number, or full name. Recommended Usage Use this tool when implementing autocomplete, quick search, or typeahead functionality where users need to find patients by partial ...
Part of the Eka EMR server.
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AI agents call search_patients to retrieve information from Eka EMR 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_patients 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_patients": {}
}
}See the full Eka EMR policy for all 17 tools.
These attack patterns abuse exactly the kind of access search_patients 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 for patients within the current workspace using a text prefix. The prefix is matched against patient username, mobile number, or full name. Recommended Usage Use this tool when implementing autocomplete, quick search, or typeahead functionality where users need to find patients by partial input. This tool is workspace-scoped and optimized for prefix-based searches. For general patient lookup, use: - list_patients: View all patients with pagination, Do not use this for search - get_patient_by_mobile: Find by exact mobile number Trigger Keywords search patient, patient search, find patient, quick patient search Returns dict with success (bool) and data (dict). It is categorised as a Read tool in the Eka EMR MCP Server, which means it retrieves data without modifying state.
Register the Eka EMR MCP server in PolicyLayer and add a rule for search_patients: 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 Eka EMR. Nothing to install.
search_patients 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_patients 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_patients. 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_patients is provided by the Eka EMR MCP server (eka-care/emr). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 17 Eka EMR tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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