Does the description clearly state what the tool does and how it differs from similar tools?
The description names a specific verb and resource ('Search public artifacts') and lists the exact filter dimensions (words, topic tag, format, ranking), making the tool's job clear. It does not explicitly differentiate from the sibling discover_snacks, so it loses the top point.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.