# Contributing to Open Design Thanks for thinking about contributing. OD is small on purpose — most of the value lives in **files** (skills, design systems, prompt fragments) rather than framework code. That means the highest-leverage contributions are usually one folder, one Markdown file, or one PR-sized adapter. This guide tells you exactly where to look for each type of contribution and what bar a PR has to clear before we merge it.

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--- ## Three things you can ship in one afternoon | If you want to… | You're really adding | Where it lives | Ship size | |---|---|---|---| | Make OD render a new kind of artifact (an invoice, an iOS Settings screen, a one-pager…) | a **Skill** | [`skills//`](skills/) | one folder, ~2 files | | Make OD speak a new brand's visual language | a **Design System** | [`design-systems//DESIGN.md`](design-systems/) | one Markdown file | | Hook up a new coding-agent CLI | an **Agent adapter** | [`apps/daemon/src/agents.ts`](apps/daemon/src/agents.ts) | ~10 lines in one array | | Add a feature, fix a bug, lift a UX pattern from [`open-codesign`][ocod] | code | `apps/web/src/`, `apps/daemon/` | normal PR | | Improve docs, port a section to Français / Deutsch / 中文, fix typos | docs | `README.md`, `README.fr.md`, `README.de.md`, `README.zh-CN.md`, `docs/`, `QUICKSTART.md` | one PR | If you're not sure which bucket your idea is in, [open a discussion / issue first](https://github.com/nexu-io/open-design/issues/new) and we'll point you at the right surface. --- ## Local setup The full one-page setup lives in [`QUICKSTART.md`](QUICKSTART.md). The TL;DR for contributors: ```bash git clone https://github.com/nexu-io/open-design.git cd open-design corepack enable # selects the pinned pnpm from packageManager pnpm install pnpm tools-dev run web # daemon + web foreground loop pnpm typecheck # tsc -b --noEmit pnpm --filter @open-design/web build # web package build when needed ``` Node `~24` and pnpm `10.33.x` are required. `nvm` / `fnm` are optional; use `nvm install 24 && nvm use 24` or `fnm install 24 && fnm use 24` if you prefer managing Node that way. macOS, Linux, and WSL2 are the primary paths. Windows native should work but isn't a primary target — file an issue if it doesn't. You don't need any agent CLI on your `PATH` to develop OD itself — the daemon will tell you "no agents found" and fall back to the **Anthropic API · BYOK** path, which is the fastest dev loop anyway. --- ## Adding a new Skill A skill is a folder under [`skills/`](skills/) with a `SKILL.md` at the root, following Claude Code's [`SKILL.md` convention][skill] plus our optional `od:` extension. **No registration step.** Drop the folder in, restart the daemon, the picker shows it. ### Skill folder layout ```text skills/your-skill/ ├── SKILL.md # required ├── assets/template.html # optional but recommended — the seed file ├── references/ # optional — knowledge files the agent reads │ ├── layouts.md │ ├── components.md │ └── checklist.md └── example.html # strongly recommended — a real, hand-built sample ``` ### `SKILL.md` frontmatter The first three keys are the Claude Code base spec — `name`, `description`, `triggers`. Everything under `od:` is OD-specific and optional, but **`od.mode`** decides which group the skill shows up in (Prototype / Deck / Template / Design system). ```yaml --- name: your-skill description: | One-paragraph elevator pitch. The agent reads this verbatim to decide if the user's brief matches. Be concrete: surface, audience, what's in the artifact, what's not. triggers: - "your trigger phrase" - "another phrase" - "中文触发词" od: mode: prototype # prototype | deck | template | design-system platform: desktop # desktop | mobile scenario: marketing # free-form tag for grouping featured: 1 # any positive integer surfaces it under "Showcase examples" preview: type: html # html | jsx | pptx | markdown entry: index.html design_system: requires: true # does the skill read the active DESIGN.md? sections: [color, typography, layout, components] example_prompt: "A copy-pastable prompt that nicely shows what this skill does." --- # Your Skill Body is free-form Markdown describing the workflow the agent should follow… ``` The full grammar — typed inputs, slider parameters, capability gating — lives in [`docs/skills-protocol.md`](docs/skills-protocol.md). ### Bar for merging a new skill We're picky about skills because they're the user-facing surface. A new skill must: 1. **Ship a real `example.html`.** Hand-built, opens straight from disk, looks like something a designer would actually deliver. No lorem ipsum, no `` placeholder hero. If you can't build the example yourself, the skill probably isn't ready. 2. **Pass the anti-AI-slop checklist** in the body. No purple gradients, no generic emoji icons, no rounded card with a left-border accent, no Inter as a *display* face, no invented stats. Read the **Anti-AI-slop machinery** section of the README for the full list. 3. **Honest placeholders.** When the agent doesn't have a real number, write `—` or a labelled grey block, not "10× faster". 4. **Have a `references/checklist.md`** with at least P0 gates (the stuff the agent has to pass before emitting ``). Lift the format from [`skills/guizang-ppt/references/checklist.md`](skills/guizang-ppt/) or [`skills/dating-web/references/checklist.md`](skills/dating-web/). 5. **Add a screenshot** at `docs/screenshots/skills/.png` if the skill is featured. PNG, ~1024×640 retina, captured from the real `example.html` at zoomed-out browser scale. 6. **Be a single self-contained folder.** No CDN imports beyond what other skills already use; no fonts you didn't license; no images larger than ~250 KB. If you fork an existing skill (e.g. start from `dating-web` and remix into a `recruiting-web`), keep the original LICENSE and authorship in `references/` and call it out in your PR description. ### Skills that already ship — pick one to imitate - Visual showcase, single-screen prototype: [`skills/dating-web/`](skills/dating-web/), [`skills/digital-eguide/`](skills/digital-eguide/) - Multi-frame mobile flow: [`skills/mobile-onboarding/`](skills/mobile-onboarding/), [`skills/gamified-app/`](skills/gamified-app/) - Document / template (no design system required): [`skills/pm-spec/`](skills/pm-spec/), [`skills/weekly-update/`](skills/weekly-update/) - Deck mode: [`skills/guizang-ppt/`](skills/guizang-ppt/) (bundled verbatim from [op7418/guizang-ppt-skill][guizang]) and [`skills/simple-deck/`](skills/simple-deck/) --- ## Adding a new Design System A design system is a single [`DESIGN.md`](design-systems/README.md) file under `design-systems//`. **One file, no code.** Drop it in, restart the daemon, the picker shows it grouped by category. ### Design system folder layout ```text design-systems/your-brand/ └── DESIGN.md ``` ### `DESIGN.md` shape ```markdown # Design System Inspired by YourBrand > Category: Developer Tools > One-line summary that shows in the picker preview. ## 1. Visual Theme & Atmosphere … ## 2. Color - Primary: `#hex` / `oklch(...)` - … ## 3. Typography … ## 4. Spacing & Grid ## 5. Layout & Composition ## 6. Components ## 7. Motion & Interaction ## 8. Voice & Brand ## 9. Anti-patterns ``` The 9-section schema is fixed — that's what skill bodies grep for. The first H1 becomes the picker label (the `Design System Inspired by` prefix is stripped automatically), and the `> Category: …` line decides which group it lands in. Existing categories are listed in [`design-systems/README.md`](design-systems/README.md); if your brand truly doesn't fit, you can introduce a new one, but **try existing categories first**. ### Bar for merging a new design system 1. **All 9 sections present.** Empty section bodies are fine for hard-to-find data (e.g. motion tokens), but the headings have to be there or the prompt grep breaks. 2. **Hex codes are real.** Sample directly from the brand's site or product, not from memory or AI guesses. The README's "brand-spec extraction" 5-step protocol applies to maintainers too. 3. **OKLch values for accent colors** are nice-to-have. They make palettes lerp predictably across light/dark. 4. **No marketing fluff.** The brand's tagline is not a design token. Cut it. 5. **Slug uses ASCII** — `linear.app` becomes `linear-app`, `x.ai` becomes `x-ai`. The 69 imported systems already follow this convention; mirror it. The 69 product systems we ship are imported from [`VoltAgent/awesome-design-md`][acd2] via [`scripts/sync-design-systems.ts`](scripts/sync-design-systems.ts). If your brand belongs upstream, **send the PR there first** — we'll pick it up automatically on the next sync. The `design-systems/` folder is for systems that don't fit upstream, plus our two hand-authored starters. --- ## Adding a new coding-agent CLI Hooking up a new agent (e.g. some new shop's `foo-coder` CLI) is one entry in [`apps/daemon/src/agents.ts`](apps/daemon/src/agents.ts): ```javascript { id: 'foo', name: 'Foo Coder', bin: 'foo', versionArgs: ['--version'], buildArgs: (prompt) => ['exec', '-p', prompt], streamFormat: 'plain', // or 'claude-stream-json' if it speaks that } ``` That's it — daemon will detect it on `PATH`, the picker shows it, the chat path works. If the CLI emits **typed events** (like Claude Code's `--output-format stream-json`), wire a parser in [`apps/daemon/src/claude-stream.ts`](apps/daemon/src/claude-stream.ts) and set `streamFormat: 'claude-stream-json'`. Bar for merging: 1. **A real session works end-to-end** with the new agent — paste the daemon log into the PR description showing it streamed an artifact through. 2. **`docs/agent-adapters.md`** is updated with the CLI's quirks (does it require a key file? does it support image input? what's its non-interactive flag?). 3. **The README's "Supported coding agents" table** gets one row. --- ## Updating model `max_tokens` metadata API-mode chat sends `max_tokens` to the upstream provider on every request. The web client picks that number from a three-tier lookup in [`apps/web/src/state/maxTokens.ts`](apps/web/src/state/maxTokens.ts): 1. The user's explicit override in Settings, if set. 2. Otherwise, the per-model default in [`apps/web/src/state/litellm-models.json`](apps/web/src/state/litellm-models.json) — a vendored slice of [BerriAI/litellm][litellm]'s `model_prices_and_context_window.json` (MIT). It covers ~2k chat models across Anthropic, OpenAI, DeepSeek, Groq, Together, Mistral, Gemini, Bedrock, Vertex, OpenRouter, and friends. 3. Otherwise, `FALLBACK_MAX_TOKENS = 8192`. To pick up a newly-launched model, regenerate the vendored JSON: ```bash node --experimental-strip-types scripts/sync-litellm-models.ts ``` The script fetches LiteLLM's catalog, filters to `mode: 'chat'` entries, projects each to its `max_output_tokens` (or `max_tokens` fallback), and writes a sorted snapshot. Commit the regenerated `litellm-models.json` alongside whatever PR triggered the refresh. The OVERRIDES table in `maxTokens.ts` is for the rare case where LiteLLM is missing or wrong for a model id we actually use — for example, `mimo-v2.5-pro` (LiteLLM only ships MiMo via the `openrouter/xiaomi/...` and `novita/xiaomimimo/...` aliases, neither of which matches the canonical id Xiaomi's direct API uses). Keep it small; everything that LiteLLM gets right belongs upstream. [litellm]: https://github.com/BerriAI/litellm --- ## Localization maintenance German uses formal `Sie` because OD speaks to a mixed audience of solo creators, agencies, and engineering teams; until project feedback shows that an informal `du` voice fits better, formal German is the least surprising default. Locale PRs should translate UI chrome, core docs, and display-only gallery metadata in `apps/web/src/i18n/content.ts`, but should not translate `skills/`, `design-systems/`, or prompt bodies that agents execute. Those source prompts are maintained as workflow inputs, and keeping one source language avoids multiplying prompt QA across locales. When adding or renaming a skill, design system, or prompt template, update the German display metadata and run `pnpm --filter @open-design/web test`; `content.test.ts` fails if German display coverage drifts. Daemon errors, export filenames, and agent-generated artifact text are known limitations unless a PR explicitly scopes them. For step-by-step instructions on adding a new locale (UI dictionary, README, language switcher, regional terminology), see [`TRANSLATIONS.md`](TRANSLATIONS.md). --- ## Code style We're not pedantic about formatting (Prettier on save is fine), but two rules are non-negotiable because they show up in the prompt stack and the user-facing API: 1. **Single quotes in JS/TS.** Strings are single-quoted unless escaping makes them ugly. The codebase is already consistent — please match. 2. **Comments in English.** Even if the PR is translating something into Deutsch or 中文, code comments stay in English so we can keep one set of greppable references. Beyond that: - **Don't narrate.** No `// import the module`, no `// loop through items`. If the code reads obviously, the comment is noise. Save comments for non-obvious intent or constraints the code can't express. - **TypeScript** for `apps/web/src/`. The daemon (`apps/daemon/`) is plain ESM JavaScript with JSDoc when types matter — keep it that way. - **No new top-level dependencies** without a paragraph in the PR description on what we get vs. what bytes we ship. The dep list in [`package.json`](package.json) is small on purpose. - **Run `pnpm typecheck`** before pushing. CI runs it; failing it earns a "please fix" comment. --- ## Commits & pull requests - **One concern per PR.** Adding a skill + refactoring the parser + bumping a dep is three PRs. - **Title is imperative + scope.** `add dating-web skill`, `fix daemon SSE backpressure when CLI hangs`, `docs: clarify .od layout`. - **Body explains the why.** "What does this do" is usually obvious from the diff; "why does this need to exist" rarely is. - **Reference an issue** if there is one. If there isn't and the PR is non-trivial, open one first so we can agree the change is wanted before you spend the time. - **No squash-during-review.** Push fixups; we'll squash on merge. - **No force-push to a shared branch** unless the reviewer asked. We don't enforce a CLA. Apache-2.0 covers us; your contribution is licensed under the same. --- ## Reporting bugs Open an issue with: - What you ran (the exact `pnpm tools-dev ...` invocation). - Which agent CLI was selected (or whether you were on the BYOK path). - The skill + design system pair that triggered it. - The relevant **daemon stderr tail** — most "the artifact never rendered" reports get diagnosed in 30 seconds when we can see `spawn ENOENT` or the CLI's actual error. - A screenshot if it's UI. For prompt-stack bugs ("the agent emitted a purple gradient hero, the slop blacklist was supposed to forbid that"), include the **full assistant message** so we can see whether the violation was the model or the prompt. --- ## Asking questions - Architecture question, design question, "is this a bug or a misuse" → [GitHub Discussions](https://github.com/nexu-io/open-design/discussions) (preferred — searchable for the next person). - "How do I write a skill that does X" → Open a discussion. We'll answer it and turn the answer into [`docs/skills-protocol.md`](docs/skills-protocol.md) if it's a missing pattern. --- ## What we don't accept To keep the project focused, please don't open PRs that: - **Vendor a model runtime.** OD's whole bet is "your existing CLI is enough". We don't ship `pi-ai`, OpenAI keys, or model loaders. - **Rewrite the frontend away from the current stack without prior discussion.** Next.js 16 App Router + React 18 + TS is the line. No Astro, Solid, Svelte, or other framework rewrites unless maintainers explicitly want that migration. - **Replace the daemon with a serverless function.** The daemon's whole point is owning a real `cwd` and spawning a real CLI. Vercel deployment of the SPA is fine; the daemon stays a daemon. - **Add telemetry / analytics / phone-home.** OD is local-first. The only outbound calls are to providers the user explicitly configured. - **Bundle a binary** without a license file and authorship attribution next to it. If you're not sure whether your idea fits, open a discussion before writing the code. --- ## License By contributing, you agree your contribution is licensed under the [Apache-2.0 License](LICENSE) of this repository, with the exception of files inside [`skills/guizang-ppt/`](skills/guizang-ppt/), which retain their original MIT license and authorship attribution to [op7418](https://github.com/op7418). [skill]: https://docs.anthropic.com/en/docs/claude-code/skills [guizang]: https://github.com/op7418/guizang-ppt-skill [acd2]: https://github.com/VoltAgent/awesome-design-md [ocod]: https://github.com/OpenCoworkAI/open-codesign