How to Debug With Claude Code: The Bug Triage Loop That Actually Works

Here is how to debug with Claude Code: run the Bug Triage Loop, a repeatable five-step method we teach at Claude Code Club. Instead of poking at code and hoping, you reproduce the bug, isolate where it breaks, form one hypothesis, apply the smallest fix, and verify it is actually gone. The loop turns a scary error into a short checklist.

The Bug Triage Loop is our own framework, and it is deliberately boring. Boring is good when something is broken. You are not trying to be clever. You are trying to change one thing, watch what happens, and keep the parts that work. Claude Code is the partner that reads the files and suggests the change, and you stay in control of what actually gets applied.

Start by reproducing the bug on purpose. A bug you can trigger every time is a bug you can fix. Tell Claude Code the exact steps: what you clicked, what you typed, what you expected, and what happened instead. Specifics matter more than feelings here, so write the real error text, not a summary of it.

In the Claude desktop app, describe the reproduction steps in plain words and paste the full error message if you have one. A bug that shows up reliably gives you something solid to test against. If you can only make it happen sometimes, spend a little more time nailing down the exact conditions before you move on, because an unpredictable bug is nearly impossible to verify as fixed later.

Once it reproduces reliably, isolate where it breaks. Ask Claude to trace the behavior back to the smallest possible spot: a single file, a single function, a single line. In the desktop app you can point Claude at your project and let it read the relevant code, then ask which piece is most likely responsible. Narrowing the search area is often ninety percent of the work.

Resist the urge to change anything yet. This step is only about finding the location, not fixing it. Ask Claude to point at the single most likely source and to explain how it reached that conclusion. When you know exactly where the problem lives, the fix almost writes itself, and you avoid touching parts of the project that were never broken.

Before you change a single line, form one hypothesis. A hypothesis is a plain-English guess you can test, like the date is being read as text instead of a number, or the button runs before the data has loaded. One guess, not five. This is the step most people skip, and skipping it is why debugging feels like flailing.

Ask Claude Code to give you its single best guess for the cause and to explain why in one or two sentences. If it lists several possibilities, ask it to rank them and pick the most likely one to test first. You are looking for a clear statement you can prove right or wrong, because a testable guess is what keeps the loop moving forward instead of in circles.

Now apply the smallest fix that could prove your hypothesis. Ask Claude Code for the minimal change, not a rewrite. A small fix has two gifts: it is easy to understand, and if it does not work, it is easy to undo. Review the change before you accept it so you know exactly what moved. You stay the decision-maker, and Claude does the typing.

Then verify it is actually gone. Run your original reproduction steps from step one and confirm the bug does not happen. This sounds obvious, but people constantly assume a fix worked without re-testing it. If the bug is still there, your hypothesis was wrong, which is fine. Go back to step three with what you just learned and form a new one.

That is the whole Bug Triage Loop. Reproduce, isolate, hypothesize, fix small, verify. When you get stuck on a bug that will not budge, bring it to the Claude Code Club community and post your steps and your hypothesis. Someone has almost certainly seen it, and the loop gives everyone a shared way to help you. ⚡