Look up a single patient by their unique patient ID.

Args: patient_id: The numeric ID of the patient (e.g. 1, 42, 200).

Returns: The patient record, or a "not found" message.

List all patients whose age is strictly greater than the given value.

Args: age: The age threshold. Returns patients older than this number.

Returns: A formatted list of matching patients, or a message if none match.

Find all patients diagnosed with a specific disease. The search is case-insensitive.

Args: disease: The disease name to search for (e.g. "Diabetes", "asthma").

Returns: A formatted list of matching patients.

List all unique diseases present in the patient dataset. Useful for discovering what diseases can be queried.

Returns: A sorted list of disease names.

Search for patients whose name contains the given text. The search is case-insensitive and supports partial matches.

Args: name: Full or partial patient name to search for (e.g. "john", "Smith").

Returns: A formatted list of matching patients.

Get summary statistics for the entire patient dataset. Includes total count, age statistics, gender breakdown, and disease distribution.

Returns: A formatted statistical summary.