Svelte Core Best Practices
rilldata/rill
Rules for writing idiomatic Svelte 5 code: when to reach for runes like state, derived and effect, and how to handle props, attachments and bindings.
House rules for reactive UI — the three state stores (React state, atoms, ECHO objects), the ECHO-to-atom bridge, and the anti-pattern catalog.
Install Reactivity
$ npx skills add dxos/dxos --skill reactivity -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install dxos/dxos reactivity --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/dxos/dxos.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/reactivity .claude/skills/reactivity && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "reactivity" agent skill from https://github.com/dxos/dxos/tree/main/.agents/skills/reactivity into .claude/skills/reactivity/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reactivity", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/dxos/dxos/tree/main/.agents/skills/reactivityType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add dxos/dxos --skill reactivity -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install dxos/dxos reactivity --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/dxos/dxos.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/reactivity .agents/skills/reactivity && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "reactivity" agent skill from https://github.com/dxos/dxos/tree/main/.agents/skills/reactivity into .agents/skills/reactivity/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reactivity", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add dxos/dxos --skill reactivity -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install dxos/dxos reactivity --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/dxos/dxos.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/reactivity .cursor/skills/reactivity && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "reactivity" agent skill from https://github.com/dxos/dxos/tree/main/.agents/skills/reactivity into .cursor/skills/reactivity/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reactivity", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/dxos/dxos.git --path .agents/skills/reactivity--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add dxos/dxos --skill reactivity -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install dxos/dxos reactivity --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/dxos/dxos.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/reactivity .gemini/skills/reactivity && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "reactivity" agent skill from https://github.com/dxos/dxos/tree/main/.agents/skills/reactivity into .gemini/skills/reactivity/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reactivity", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install dxos/dxos reactivityInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add dxos/dxos --skill reactivity -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/dxos/dxos.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/reactivity .github/skills/reactivity && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "reactivity" agent skill from https://github.com/dxos/dxos/tree/main/.agents/skills/reactivity into .github/skills/reactivity/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reactivity", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add dxos/dxos --skill reactivity -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install dxos/dxos reactivity --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/dxos/dxos.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/reactivity .opencode/skills/reactivity && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "reactivity" agent skill from https://github.com/dxos/dxos/tree/main/.agents/skills/reactivity into .opencode/skills/reactivity/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reactivity", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
reactivity- GitHub stars
- 525
- Token cost
- ~3.4k tokens
- SKILL.md length
- 1,671 words
- Files
- 1
- Skills in repo
- 41
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
House rules for reactive UI — the three state stores (React state, atoms, ECHO objects), the ECHO-to-atom bridge, and the anti-pattern catalog.
- Works in 3 steps: React state (useState / useReducer) —… → Atom state (@effect/atom) — shared or… → ECHO objects — persistent, shared,…
- Placing component state
- SKILL.md covers The three stores, The bridge, Process and Which API, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Reactivity is an agent skill from dxos/dxos. House rules for reactive UI — the three state stores (React state, atoms, ECHO objects), the ECHO-to-atom bridge, and the anti-pattern catalog. Use when adding or placing component state, reading ECHO objects or refs in a component, rendering a list of refs, deriving a value from several reactive sources, when UI shows stale data or doesn't update until you navigate away and back, or when reviewing a diff that touches plugin containers or components.
Its SKILL.md is about 3.4k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Frontend & Design, covering State management. The repository describes itself as: TypeScript implementation of the DXOS protocols, SDK, toolchain and Composer.
When your agent uses it
- Placing component state
- Reading ECHO objects
- Refs in a component
- Rendering a list of refs
Example prompts
- “/reactivity”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- React state (useState / useReducer) — ephemeral and component-local: an open/closed
- Atom state (@effect/atom) — shared or derived reactive state: anything two components
- ECHO objects — persistent, shared, collaborative data. An ECHO object is a singleton
What it can do on your machine
Read from SKILL.md and the folder at commit 2e6b92a. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Reactivity loads about 3.4k tokens when it runs. Until then it costs about 116 tokens; SKILL.md has 1,671 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,671 words (~3,396 tokens).
“How we build reactive UI, and the anti-pattern catalog that enforces it — applied while writing a component and as a review pass over a diff.”
- name
- reactivity
Files
Just SKILL.md in .agents/skills/reactivity of dxos/dxos.
Open the folder on GitHubat commit 2e6b92a
Compare with similar skills
Reactivity next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Reactivity this skilldxos/dxos | 525 | — | ~3.4k | Automated safety check: Pass | Custom licence | |
| Svelte Core Best Practicesrilldata/rill | 2.9k | 4 repos | ~1.8k | Automated safety check: Pass | Apache-2.0 | |
| Dify Component Writing Guidelanggenius/dify | 158k | — | ~626 | Automated safety check: Pass | Custom licence | |
| React State Managementinvolvex/youtube-music-cli | 456 | 13 repos | ~3k | Automated safety check: Pass | MIT | |
| Pierre Theming Librarypierrecomputer/pierre | 6.3k | — | ~661 | Automated safety check: Pass | Apache-2.0 | |
| Frontend Patternskurealnum/dotfiles | 290 | 19 repos | ~3.7k | Automated safety check: Pass | None |
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Related
Categories
Questions about Reactivity
What does Reactivity do?
House rules for reactive UI — the three state stores (React state, atoms, ECHO objects), the ECHO-to-atom bridge, and the anti-pattern catalog. Reactivity is an agent skill from dxos/dxos. House rules for reactive UI — the three state stores (React state, atoms, ECHO objects), the ECHO-to-atom bridge, and the anti-pattern catalog.
When should I use Reactivity?
Reactivity fits situations like: placing component state; reading ECHO objects; refs in a component; rendering a list of refs.
How do I install Reactivity in Claude Code?
Run `npx skills add dxos/dxos --skill reactivity -a claude-code`. Or copy the skill folder (.agents/skills/reactivity in dxos/dxos) into .claude/skills/reactivity in your project. Claude Code loads it when a task matches its description.
How do I install Reactivity in Codex?
Run `npx skills add dxos/dxos --skill reactivity -a codex`. Or copy the skill folder (.agents/skills/reactivity in dxos/dxos) into .agents/skills/reactivity in your project. Codex loads it when a task matches its description.
Can I use Reactivity in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add dxos/dxos --skill reactivity -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/reactivity, .gemini/skills/reactivity, .github/skills/reactivity and .opencode/skills/reactivity in your project.
What does Reactivity need to run?
SKILL.md names no scripts, command-line tools or credentials: Reactivity is instructions for the agent only.
Does Reactivity access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Reactivity safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Reactivity use?
Reactivity has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Reactivity use?
About 3.4k tokens (SKILL.md is roughly 14k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Reactivity?
Skills that share tags, products or a category with Reactivity: Svelte Core Best Practices (rilldata/rill, 2.9k stars), Dify Component Writing Guide (langgenius/dify, 158k stars), React State Management (involvex/youtube-music-cli, 456 stars) and Pierre Theming Library (pierrecomputer/pierre, 6.3k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Reactivity?
dxos (a GitHub organization) maintains it in dxos/dxos, which has 525 GitHub stars. The repository holds 41 skills in this directory. The repository was last updated on October 9, 2026.
Source: dxos/dxos on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.