Signed commits and commitlint move the first governance gate onto the developer's laptop

Two controls arrive in one command, by different routes. `git commit -S` signs the object with the developer's SSH or ED25519 key, which is what establishes that he wrote it ^[2]. The message check runs only because Husky wired commitlint into the commit-msg hook ^[3]. The post notes that local hooks are bypassable with `--no-verify` ^[6], and the bypass takes out the hook; the signature came from a flag on the same command, so skipping hooks does not unsign anything ^[14].

So the same rule runs again on the runner. The post's own framing is that the hooks are the first fast filter and CI is the real guarantee ^[6]. Every commit that reaches a pull request therefore has its message parsed twice, once on the laptop and once in Actions ^[15].

Take the timing figures in the post as characterisations, offered without a published measurement. A local hook runs in milliseconds on the developer's machine and consumes no CI resources ^[4]. The same trivial formatting failure, caught only in CI, could cost several minutes of feedback loop and block integration until the developer fixes it ^[7]. For those minutes to transfer to your repository, two things have to hold: queue and checkout time have to dominate the check itself, and the tree has to be large enough that linting everything costs materially more than linting the staged files, which is the scoping the post recommends ^[8].

What pays for the friction sits downstream of the commit. With the convention in place, `git log --oneline` stops being noise and becomes a changelog, each entry saying what changed and, with a scope, where ^[10]. Changesets and semantic-release then derive major, minor and patch bumps from the commit types, and without the convention that bump is manual and error-prone ^[11]. In my view the release derivation is the reason to accept a hook that can abort a commit over a missing colon; if nothing downstream consumes the types, the rule only enforces tidiness.

The published post breaks off mid-sentence while describing `git bisect` across `fix(...)` and `feat(...)` commits ^[13], so the rest of its CI check list is not in the record. The rule it does state for placement is that each validation runs at the cheapest layer that can detect its failure ^[12].