Does the description clearly state what the tool does and how it differs from similar tools?
The description names a specific verb ('Search'), a specific resource (the mechoulam.de cannabis-medicine evidence register), and enumerates the searchable fields (indication, condition, drug, study title, author). It also states what it returns, clearly distinguishing it from the more targeted sibling tools get_indication, get_study, fetch, and list_indications.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.