My personal experience of Fable 5 doing its own thing has been very positive.
I was trying to find the root cause of a crash in a Python module which left no errors in the log or console. Fable wrote a test harness that simulated clicks in the UI, then bisected my code until it found the point where it started crashing. It exaggerated the cause of the crash, then ran a series of bash one-liners to make Python virtual environments under `/tmp` for each version of that Python module until it found one that did not crash.
It went way deeper to root cause discovery (a regression in the module causing a heap allocation overflow) than I could have done myself, provided enough info and a simplified example to raise a bug report and then wrote a work-around to prevent that from happening in my application.
I don't let it run completely loose; I review each CLI command it wants to run and I append answers to the "yes" continue action (if I have them) to prevent excessive token use.
Yeah, I think Fable is really good for debugging tricky bugs.
Setting boundaries in your prompt / markdowns helps; for example if I tell it to not use any web browser automation, I have seen Fable respect both the rule and the spirit of it (no weird hacks etc).
It does seem to treat some simple debugging tasks as more complicated than it actually is. OP’s post is probably a good example.
> I was trying to find the root cause of a crash in a Python module which left no errors in the log or console. Fable wrote a test harness that simulated clicks in the UI, then bisected my code until it found the point where it started crashing
Does this need an agent though is my question? Maybe generating a test case and a loop doing git bisect but why on earth would we want to run it through the internet and gpus and whatnot when it can be run on a single core celeron.
everyone is discovering everyone else's practices?
its handy to have that run locally yeah, but thinking of that as being the way is not straightforward
I think it is fine to create the scripts with the cloud based llm but it is definitely not a fable / opus level thing, and running the bisect loop itself has nothing to do with an agent, it is a simple shell script.