Agent #8 · 100 AI Agents ✦ No API Key Needed ✦ Step-Through Debugger

Bug Explainer

Paste broken code + error → animated execution trace, plain-English fix & study links. Free for students.

Your buggy code
Error message / traceback
✓ Auto-detected
⚡ The bug in one sentence
🧠 Why this happens
🔧 The fix
diff — old vs fixed
👁 How to spot this next time
    🎬 Step-Through Execution Trace

    Watch your code run line by line — see exactly where it breaks and what each variable holds at every step.

    code Step 0 / 0
    📦 Variable State
    Press Play to start
    Press Play or Step › to begin the trace.
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    📚 Study This Topic

    Resources to actually understand the concept behind this bug — not just fix it today.

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