mcpbeat

Running CI Preflight

posthog/running-ci-preflight

> Use when the pre-push hook blocks a push, before reporting a task done, or after editing Python, serializers, migrations, workflows, or dependency manifests — to avoid burning a CI matrix on a failure you could catch locally (formatting, lint, broken lockfiles, OpenAPI drift, migration conflict, stale branch).

995 tokens
context cost
the whole folder, loaded on every use
1
files
instructions only
0
copies elsewhere
how many repositories repackaged it
690
stars on the repo
on the repository, not the skill itself

Install

one command, takes just this skill from the repository
npx skills add https://github.com/PostHog/posthog --skill running-ci-preflight

The instruction itself

4 sections, as written by the author

Running ci:preflight

hogli ci:preflight scopes a curated set of checks to the files your branch touched — each mapped to a

CI failure class that has taken master down — plus an always-on branch-freshness check. It is the

pre-push counterpart to hogli ci:insights (what is _already_ broken on master).

The pre-push hook runs ci:preflight --strict automatically and blocks the push on failed checks.

Never bypass it with --no-verify — fix what it reports instead.

The loop (when the hook blocks, or before reporting done)

hogli ci:preflight --fix
  • Run with --fix — it formats, lints, and auto-fixes what is safe.
  • Read each line: ✓ pass, ✗ fail, → advisory (do it yourself), · skipped (capability absent).
  • Resolve every ✗ fail — these are what --fix could not (real lint error, broken lockfile, migration conflict). These block the push.
  • Act on every → advisory — e.g. openapi advisory → run hogli build:openapi and commit the drift; staleness advisory → git merge origin/master. Advisories never block, but ignoring them ships the failure to CI. Resolve them before pushing, including drift you didn't introduce — you own the branch state you push.
  • Re-run until clean, then push.

Notes

  • Strict = failures only. --strict (what the hook runs) exits non-zero only on ✗ fail — advisories are unverifiable-locally classes, so they warn without blocking. A clean exit means "nothing left to fix", not "CI will pass" — CI stays the authoritative gate. Non-blocking is a mechanism limit, not permission to skip.
  • type-check is a nudge, not a run. Only a repo-wide mypy run matches CI (mypy follows imports, so a changed-file subset misses reverse-dependency breakage), and that costs minutes cold — too much to tax every push with. So preflight names the command instead of running it: judge whether your change is type-risky and run it yourself. CI blocks on the same command, so a type error you skip here comes back as a full re-run.
  • Staleness is risk-based. It fires when merging master _now_ would actually break something — textual merge conflicts (computed via git merge-tree, working tree untouched), migrations added on both sides, generated-file inputs changed on both sides, or CI workflows changed on master — plus a behind/age backstop, aggressive by default (5 commits / 2 days; env-tunable via HOGLI_PREFLIGHT_STALE_COMMITS/HOGLI_PREFLIGHT_STALE_DAYS) so we over-warn to start and tune down from telemetry. Merge master in when it fires. Advisory only, never auto-merged.
  • · skipped (needs stack/node) is expected on a bare checkout or sandbox. Start the stack with hogli start to run those, or let CI cover them. No hooks in your environment (no node_modules)? Run the loop yourself before pushing.
  • Flags. --against <ref> diffs against an explicit base; --json emits a machine-readable summary.
  • Kill switch. HOGLI_PREFLIGHT_DISABLED=1 makes the command (and the hook) a no-op with exit 0. It is a rollout/emergency lever — respect it; never unset it to force a run.

Why it matters

Drafts already run a trimmed CI subset; the expensive waste is a ready PR that fails the full matrix on

something deterministic, gets fixed, and re-runs the whole matrix. Catching that locally is the cheapest

CI saving available.

How to use it

Copy the folder

Take posthog/running-ci-preflight from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.