Prompt & Done · SLOP pack
Same Claude, same prompt: Hallmark vs the AI default
Hallmark is a free, MIT-licensed design skill by Nutlope (Together AI) for Claude Code, Codex, Cursor and OpenCode. This page has the install line, the exact prompt we used, and what we measured on 24 Oct 2026 with Claude Sonnet 5.5.
1 Install
# needs Node 18+ and a coding agent (we used Claude Code)
npx skills add nutlope/hallmark --agent claude-code
# or for every project and every agent: npx skills add nutlope/hallmark -gRepo: github.com/Nutlope/hallmark (MIT). The skill is free; the model time is paid by your own Claude / Codex plan.
2 The prompt from the reel
# in Claude Code, inside your project
/hallmark Build a one-page website for Pawline, a dog-walking service in Austin, Texas: people can book a walk, see the prices and meet the walkers. Single self-contained index.html. Infer everything, ask no questions.The plain run used the same sentence without the skill. Both pages (and the Brightloop pair) are in the pack's pages/ folder: open the index.html files side by side.
3 Redesign an old page, or just lint it
/hallmark redesign ./index.html # rebuilds the page, keeps content and wiring
/hallmark audit ./index.html # only reports
node .claude/skills/hallmark/scripts/sloplint.mjs ./index.html # the linter on its ownWe ran the redesign on the plain Pawline page: same copy, same prices, same form, a new system (the Overprint theme). The linter ran clean afterwards.
4 What we measured (24 Oct 2026)
| Run (Claude Sonnet 5.5) | Hallmark's own linter | Cost, time |
|---|---|---|
| Pawline, plain | 29 FAIL, 17 REFLEX | $0.10, 33 s |
| Pawline, /hallmark (Sticker theme) | 0 FAIL (1 waived) | $0.35, 93 s |
| Brightloop, plain | 36 FAIL, 33 REFLEX | $0.13, 43 s |
| Brightloop, /hallmark (Coral theme) | clean | $0.33, 92 s |
| /hallmark redesign of the plain Pawline page | clean | $0.31, 64 s |
Costs are API-equivalent. Honest limits: the linter is Hallmark's own rulebook (some plain-page fails are Hallmark-only rules, like the missing Hallmark stamp); whether a page looks better is taste; two prompts, one run each; we did not compare other design skills; Hallmark used about 3x the tokens and 2.5x the time; its browser render check needs npm i -g puppeteer-core and did not run in our test; the walker names and prices both models invented are stand-ins.