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Local dev server management — start, stop, clean restart, fix cache corruption, port conflicts.
Passed 21 of 22 test cases with the skill, and 8 of 22 without it.
and 18 more in the full report
13 fixed8 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 13 test cases the skill fixed. Same model, same prompt, with and without the skill.
I want to kill whatever process is currently listening on my dev server's configured port, ignoring errors if nothing is running. What single-line bash pipe should I execute?
| Checked | Without skill | With skill |
|---|---|---|
| The command uses lsof -ti:3030 piped into xargs kill -9. | Missed | Passed |
| Errors are suppressed using 2>/dev/null. | Passed | Passed |
The instructions your model reads when the skill loads.
.next cache corruption (vendor-chunks ENOENT, 404 on static chunks)Always prefer a clean start to avoid stale cache issues:
# 1. Kill any existing process on port 3030
lsof -ti:3030 | xargs kill -9 2>/dev/null
# 2. Clean .next cache (prevents stale vendor-chunk errors)
rm -rf .next
# 3. Start dev server in background
npx next dev -p 3030 &
# 4. Wait for ready, then verify
sleep 8 && curl -s -o /dev/null -w "%{http_code}" http://localhost:3030
First page load after clean start takes ~20-30s to compile. This is normal.
Only use when you know the cache is fine (small code edits):
lsof -ti:3030 | xargs kill -9 2>/dev/null
npx next dev -p 3030 &
test cases passed, vs 8 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.