Seems to indicate the need for a search interface, which was hinted at by the article.
Maybe the tool selection could happen after the initial query? The results from the default tool guessed by WA, then choices of other possible matches. The key word "weight" could suggest the weight query, then key word match "elephant" to give choices like Indian elephant, African elephant, etc. and allow the user to click which one she had in mind. Maybe some keyword matches for elephant from other databases listed after that.
The problem, though, is they don't have the amount of data Google can use to help predict what a user most likely wants from a given query.
Maybe the tool selection could happen after the initial query? The results from the default tool guessed by WA, then choices of other possible matches. The key word "weight" could suggest the weight query, then key word match "elephant" to give choices like Indian elephant, African elephant, etc. and allow the user to click which one she had in mind. Maybe some keyword matches for elephant from other databases listed after that.
The problem, though, is they don't have the amount of data Google can use to help predict what a user most likely wants from a given query.