Interactive Debugger

Use when a program crashes, produces wrong output, or you need to understand exactly how execution reached a particular state — and running it again with more print statements won't give you the answer fast enough.

You can pause a running program at any point, read live variable values and the call stack at that exact moment, step forward line by line or jump to the next breakpoint, and evaluate arbitrary expressions against the live process — all without restarting.

Think like a developer sitting at a debugger. Each pause is an observation. Each observation either confirms your current theory about the bug or disproves it and points somewhere new. You're not guessing — you're surgically stopping execution where the truth lives and reading it directly.

Setup