Coding & Development / Debugging

Take a stack trace and identify the root cause, suggesting where to add logging or breakpoints.
Difficulty: Intermediate
Model: GPT-4 / Claude / Gemini
Use Case: Stack Trace Analysis, Debugging, Root Cause
Updated: May 2026
Why This Prompt Exists
Most developers see a stack trace and start at the top — which is rarely the root cause.

You get:

  • debugging from the wrong line (wasting time)
  • missing the root cause buried in the trace
  • no idea where to add logging or breakpoints
  • ignoring the call chain that led to the error
  • fixing symptoms instead of causes

But a stack trace is not random.

It is a map of the execution path.

  • First frame: where the error was thrown (not always the cause)
  • Your code frames: where your logic is (start here)
  • Framework/library frames: rarely the problem
  • Root cause: often several frames down

Without analysis, you fix the wrong line.

This framework forces AI to pinpoint the root cause.

The Prompt
Assume the role of a debugging expert who reads stack traces like a detective reads clues.

Your task is to analyze a stack trace and identify the root cause.

Generate:

1. ROOT CAUSE IDENTIFICATION
   - Which line/file is the actual cause
   - Why (not where) the error occurred

2. CALL CHAIN EXPLANATION
   - How execution got to the error
   - Which frames are relevant vs. irrelevant

3. LOGGING SUGGESTIONS
   - Where to add console.log or logging statements
   - What to log at each point

4. BREAKPOINT RECOMMENDATIONS
   - Which lines to set breakpoints
   - What to inspect at each breakpoint

5. FIX SUGGESTION
   - Specific code change

INPUTS:

Stack Trace (paste full trace):
[PASTE STACK TRACE]

Language/Framework:
[PYTHON / JAVASCRIPT / JAVA / C# / OTHER]

Known Recent Changes:
[LIST OR "NONE"]

Error Type (if known):
[E.G., "Null reference," "Index out of range," "Type mismatch"]

RULES:
- Identify the first line of YOUR code in the stack (not library code)
- Explain the call chain (how execution reached the error)
- Ignore framework/library frames for root cause
- Suggest specific logging (not "add more logs")
- Suggest specific breakpoints (not "debug it")
- Don't assume you know the fix without enough context
How To Use It
  • Paste the full stack trace (not just the error message).
  • Identify which lines are your code vs. library code.
  • The root cause is usually in your code, not the library.
  • Follow the logging suggestions to instrument your code.
  • Set breakpoints at the recommended lines and inspect variables.
Example Input

Stack Trace:
Traceback (most recent call last):
File “app.py”, line 45, in
result = process_data(user_input)
File “app.py”, line 32, in process_data
return [item.name for item in data_list]
File “app.py”, line 32, in return [item.name for item in data_list]
AttributeError: ‘NoneType’ object has no attribute ‘name’

Language/Framework: PYTHON

Known Recent Changes: Changed data_list to come from a new API endpoint instead of a local file

Error Type: AttributeError (‘NoneType’ object has no attribute ‘name’)

Why It Works
Most developers waste time on the wrong line.

This framework improves outcomes by forcing:

  • root cause identification (accuracy)
  • call chain explanation (understanding)
  • specific logging suggestions (instrumentation)
  • breakpoint recommendations (debugging)
  • fix suggestion (resolution)

Great stack trace analysis doesn’t just read — it interprets and prescribes.

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