Full debugging workflow — reproduce the bug with a failing test, perform root cause analysis, then implement a minimal fix.

Debug Debug a reported issue using a structured reproduction then fix approach. Phase 1: Reproduction & Root Cause Analysis 1. Investigate — Analyze the bug report for key symptoms and error messages 2. Trace — Search the codebase for error occurrence patterns, trace from symptom to source 3. Root cause — Identify the root cause through data flow analysis and edge case checking 4. Reproduce — Reproduce the exact error with the smallest useful check (a command, dry run, manual flow, or automated test) 5. Document — Clearly document the root cause and reproduction steps Phase 2: Fix Implementation 1. Plan — Analyze the optimal fix approach based on root cause, check for similar fixes in the codebase 2. Implement — Make the minimal, targeted fix that addresses the root cause 3. Verify — Repeat the reproduction to confirm the fix and run relevant existing checks. Follow verify and ship for proportionate scope; add a regression test only when the concrete failure warrants durable coverage Principles Minimal changes — Fix the bug, nothing more Targeted — Only touch affected code paths Verified — Confirm the reproduction succeeds after the fix and preserve relevant existing safeguards; a new test file is not mandatory No unrelated improvements — Stay focused on the specific bug