Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden but offers minimal behavioral insight. It hints at computational aspects ('BFS solver') and outputs ('unsolvable diagnostics'), but doesn't disclose critical traits like whether it modifies the level, requires authentication, has rate limits, or what the diagnostics entail. For a zero-parameter tool with no annotation coverage, this is insufficient.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.