TRACEStep-by-step debugger reasoning. Walks through code execution like a debugger would.
Category: Batch 11 — Community Picks
Before / After
Why is this function returning undefined?
TRACE Why is this function returning undefined? [paste code + input]
What changes in Claude's response
Claude walks through the code line by line, tracking the value of every variable at each step. 'Line 1: items = [1,2,3]. Line 2: filtered = items.filter(x => x > 5) → []. Line 3: return filtered[0] → undefined.' The explicit trace makes the bug obvious in a way that 'review my code' never does.
Full deep dive locked
The complete analysis for TRACE — including when NOT to use it, the failure modes, and the codes it stacks with — is in the full cheat sheet along with 119 other tested prefixes.
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