What are Tree-of-Thoughts and LATS, and when is search-based planning worth the cost?

Linear agents commit to one path and can't backtrack. Tree-of-Thoughts and LATS add search over reasoning paths. The signal is knowing what they buy, what they cost, and when a cheaper loop wins.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Linear agents commit to one path and can't backtrack. Tree-of-Thoughts and LATS add search over reasoning paths. The signal is knowing what they buy, what they cost, and when a cheaper loop wins.

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