Is this GitHub repo safe to run?
Nobody can promise you that a repository is safe. What you can do is look at the things that go wrong most often, before the code gets a chance to run on your machine.
The risk is not usually a clever exploit. It is that installing a package runs code. An npm install can execute a postinstall script before you have read a single line, and that script has whatever access your shell has: your SSH keys, your cloud credentials, your environment variables, your session tokens.
So the questions worth asking are mechanical. Does anything run automatically on install? Does the code decode a blob of text and execute it, rather than doing something you can read? Does it reach for credential files or a cloud metadata endpoint? Does it phone somewhere you do not recognise? Do the dependencies come from the registry, or from a git URL or a mirror somebody could have swapped?
You can check most of that by reading, and reading is safe. xlogs downloads a public repo and inspects it statically. It never installs it and never runs it, which is the whole point: the dangerous step is the one you are trying to decide about.
Check a repo before you run it
Common questions
Does a lot of stars mean a repo is safe?
No. Stars measure attention, not review, and they can be bought. A popular project can also be compromised in a single release, which is what supply-chain attacks do: the repo that was safe last week is the same repo today, with one new commit.
What is actually dangerous about npm install?
Install hooks. A package can declare preinstall or postinstall scripts that run automatically, with your user's permissions, before you have used the library at all. You can disable them with --ignore-scripts, though some legitimate packages need them to build.
Can xlogs tell me a repo is definitely safe?
No, and it will not say so. It reports what these specific checks found and what they did not cover. A clean result means these checks found nothing, not that the code is harmless. Anyone claiming certainty about arbitrary code is overselling.