What's the most cost-effective way to speed up debugging and code understanding using a pair programming assistant?

The most cost-effective approach is usually not to use the assistant as a “write the code for me” tool, but as a debugging copilot and code-explainer with a tight workflow.

Best value workflow

1. Paste the smallest failing slice

   • The exact error message
   • Relevant function/module
   • Minimal reproduction steps
   • Expected vs actual behavior

2. Ask for structured help Use prompts like:

   • “Explain this function line by line.”
   • “Find likely bug sources in this stack trace.”
   • “Suggest a minimal fix and why it works.”
   • “What assumptions is this code making?”
   • “How would you test this bug?”

3. Use it to narrow, not guess Have the assistant:

   • identify likely root causes
   • map data flow
   • explain unfamiliar library/framework behavior
   • propose hypotheses in order of probability

4. Request verification steps Ask:

   • “What logs would confirm this?”
   • “What unit test should fail before the fix?”
   • “What edge cases might still break?”

Most cost-effective usage pattern

• Short, focused prompts
• Only include relevant code
• Iterate on one issue at a time
• Use it to understand code before editing
• Ask for test cases and debugging checkpoints

High-ROI tasks for a pair programming assistant

• Reading unfamiliar code quickly
• Interpreting stack traces
• Finding likely null/typing/race-condition issues
• Generating minimal repros
• Suggesting tests
• Explaining third-party APIs or legacy code

Tasks that are usually lower ROI

• Asking it to rewrite large files
• Giving it the whole repo without context
• Using it to brainstorm before defining the bug
• Accepting fixes without understanding them

If you want a practical “cheap and effective” setup

• Use a tool/plan that supports:
  • codebase search
  • file context
  • inline diffs
  • session memory across the current task
• Pair that with a habit of:
  • asking for explanations first
  • then targeted fixes
  • then tests

A good prompt template

I’m debugging this issue. Here’s the error, the relevant code, and what I expected.
Please:

1. explain the code path,
2. identify the most likely bug,
3. propose the smallest fix,
4. suggest a test that would catch it.

If you want, I can also give you:

• a best-practice prompt pack for debugging,
• a workflow for reading unfamiliar code fast, or
• a cost comparison of common pair-programming assistants.