Posts on Codes

Claude Cloud Routine vs. GitHub Actions cron: they look the same but you manage them differently

Mon, 17 Aug 2026 00:00:00 +0000

A repo with no visible cron workflow isn’t proof there’s no automated publishing. The schedule and generation logic can live entirely outside the repo, on Claude’s side.

GitHub Pages custom subdomains: static/CNAME alone is never enough

Sun, 16 Aug 2026 00:00:00 +0000

The repo can have its CNAME file and the Pages API can have its cname field set — but without an actual DNS record at the registrar, certificate issuance stays blocked.

One subdomain = one GitHub Pages repo — running many sites off a single account

Fri, 14 Aug 2026 00:00:00 +0000

It’s easy to assume GitHub Pages only really serves one thing per account. In practice it’s the CNAME file that decides routing.

Commit message language is a per-repo decision — and the automation template needs updating too

Tue, 11 Aug 2026 00:00:00 +0000

An English-facing site had commits piling up in Korean. Switching new commits to English seemed simple, until one easy-to-miss spot turned up.

Adding an LLM feature to a static site without ever putting a token in the browser

Thu, 30 Jul 2026 00:00:00 +0000

Two options came up first — an API key in localStorage, or a Cloudflare Worker proxy — and neither was it. A GitHub-issue trigger pattern was requested instead.

npx skills add installs to ~/.agents/skills, not ~/.claude/skills

Sun, 26 Jul 2026 00:00:00 +0000

The install command exits clean and the files exist on disk, but the skill still won’t show up in the session — check the path first.

Hugo Hextra theme: in-content relative links must end in .md

Tue, 07 Jul 2026 00:00:00 +0000

An extensionless relative link like lab renders fine locally but 404s under GitHub Pages’ pretty URLs.

If Vercel deploy fails for no obvious reason, check for uppercase in the folder name

Mon, 06 Jul 2026 00:00:00 +0000

A project folder named CTI trips up both create-next-app and vercel deploy on name validation.

LaTeX just doesn't work under Docusaurus MDX v3 (future.v4) — stop fighting it

Tue, 16 Jun 2026 00:00:00 +0000

Installing remark-math + rehype-katex exactly by the book still breaks the build, because braces inside

$$...$$

get parsed as JSX expressions.

Finding the real doc ID for index.md in a Docusaurus manual sidebar

Mon, 15 Jun 2026 00:00:00 +0000

Every plausible-looking ID like 01-foundations/01-cryptography/index turned out wrong. The real ID was sitting in the build output the whole time.