React Useeffect
viclafouch/meme-studio
Audit React components for unnecessary useEffect hooks. An agent skill from viclafouch/meme-studio.
Manage application state with the @virtuoso.dev/reactive-engine- package family.
Install Reactive Engine
$ npx skills add petyosi/react-virtuoso --skill reactive-engine -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install petyosi/react-virtuoso reactive-engine --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/petyosi/react-virtuoso.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/reactive-engine .claude/skills/reactive-engine && 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 "reactive-engine" agent skill from https://github.com/petyosi/react-virtuoso/tree/main/skills/reactive-engine into .claude/skills/reactive-engine/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reactive-engine", 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/petyosi/react-virtuoso/tree/main/skills/reactive-engineType 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 petyosi/react-virtuoso --skill reactive-engine -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install petyosi/react-virtuoso reactive-engine --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/petyosi/react-virtuoso.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/reactive-engine .agents/skills/reactive-engine && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "reactive-engine" agent skill from https://github.com/petyosi/react-virtuoso/tree/main/skills/reactive-engine into .agents/skills/reactive-engine/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reactive-engine", 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 petyosi/react-virtuoso --skill reactive-engine -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install petyosi/react-virtuoso reactive-engine --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/petyosi/react-virtuoso.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/reactive-engine .cursor/skills/reactive-engine && 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 "reactive-engine" agent skill from https://github.com/petyosi/react-virtuoso/tree/main/skills/reactive-engine into .cursor/skills/reactive-engine/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reactive-engine", 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/petyosi/react-virtuoso.git --path skills/reactive-engine--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 petyosi/react-virtuoso --skill reactive-engine -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install petyosi/react-virtuoso reactive-engine --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/petyosi/react-virtuoso.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/reactive-engine .gemini/skills/reactive-engine && 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 "reactive-engine" agent skill from https://github.com/petyosi/react-virtuoso/tree/main/skills/reactive-engine into .gemini/skills/reactive-engine/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reactive-engine", 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 petyosi/react-virtuoso reactive-engineInstalls 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 petyosi/react-virtuoso --skill reactive-engine -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/petyosi/react-virtuoso.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/reactive-engine .github/skills/reactive-engine && 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 "reactive-engine" agent skill from https://github.com/petyosi/react-virtuoso/tree/main/skills/reactive-engine into .github/skills/reactive-engine/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reactive-engine", 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 petyosi/react-virtuoso --skill reactive-engine -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install petyosi/react-virtuoso reactive-engine --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/petyosi/react-virtuoso.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/reactive-engine .opencode/skills/reactive-engine && 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 "reactive-engine" agent skill from https://github.com/petyosi/react-virtuoso/tree/main/skills/reactive-engine into .opencode/skills/reactive-engine/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "reactive-engine", 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
reactive-engine- GitHub stars
- 6.5k
- Token cost
- ~4.1k tokens
- SKILL.md length
- 1,420 words
- Files
- 16 (incl. references)
- Skills in repo
- 5
- Repo updated
- First seen
- Licence
- None found
At a glance
Manage application state with the @virtuoso.dev/reactive-engine- package family.
- Works in 6 steps: Label the root, expected sink, and… → Attach at the correct lifecycle:… → Start with value capture disabled. Read… → …
- Defining reactive state with Cell
- SKILL.md covers Mental model: nodes are…, The three API flavors (most…, Wiring the graph and React integration, plus 7 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Reactive Engine is an agent skill from petyosi/react-virtuoso. Manage application state with the @virtuoso.dev/reactive-engine- package family. Use this skill when (1) defining reactive state with Cell, Stream, Trigger, or Resource nodes, (2) wiring React components through EngineProvider, useCellValue, useCellValues, or usePublisher, (3) fetching data with Query and Mutation from reactive-engine-query, (4) routing with Route, Layout, and Guard from reactive-engine-router, (5) persisting cells with linkCellToStorage, (6) architecting a component or library on top of the…
Its SKILL.md is about 4.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 21 other files, including reference files (for example `references/core/01.core-concepts.md`, `references/core/02.engine-and-lifecycle.md` and `references/core/03.transactions.md`).
It sits in Frontend & Design, covering React components and Event-driven systems. The repository describes itself as: The most powerful virtual list component for React.
When your agent uses it
- Defining reactive state with Cell
- Wiring React components through EngineProvider
- Fetching data with Query and Mutation from reactive-engine-query
- Routing with Route
Example prompts
- “No active engine found”
- “/reactive-engine”
Workflow steps
6 steps, taken from the first numbered list in SKILL.md.
- Label the root, expected sink, and intermediate nodes with describeNode. Add narrow summarize functions only for application-specific…
- Attach at the correct lifecycle: EngineProvider.diagnostics includes initFn; useEngineDiagnostics observes the nearest engine after…
- Start with value capture disabled. Read roots and events in order. Inspect distinct-suppressed, no-candidate, prune events, and…
- Compare engineInstanceId and engineLabel when state appears to come from the wrong instance. Use transactionId, origin, and parentCycle…
- Enable summaries only for the nodes needed to verify the hypothesis. Redact before exporting. Node summarizers receive live values and…
- Remove the observer after reproduction. Core and React retain no history; build any diagnostic UI on a bounded external store, not…
What it can do on your machine
Read from SKILL.md and the folder at commit b2a02d0. 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
Reactive Engine loads about 4.1k tokens when it runs, and up to ~26k if it reads all its reference files. Until then it costs about 221 tokens; SKILL.md has 1,420 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
Without a licence we can't republish the file, so here is its outline and opening line. It has 1,420 words (~4,126 tokens).
“A reactive state system built on a graph of typed nodes. Five packages compose:”
- name
- reactive-engine
Files
SKILL.md and 15 other files (references) in skills/reactive-engine of petyosi/react-virtuoso.
- SKILL.md
- references/core/01.core-concepts.md
- references/core/02.engine-and-lifecycle.md
- references/core/03.transactions.md
- references/core/04.operators-and-combinators.md
- references/core/05.building-on-the-engine.md
- references/core/06.diagnostics.md
- references/core/README.md
- references/query/01.queries-and-mutations.md
- references/query/README.md
- references/react/01.react-integration.md
- references/react/README.md
- references/router/01.routing.md
- references/router/README.md
- references/storage/01.storage-links.md
- … and 1 more
Open the folder on GitHubat commit b2a02d0
Compare with similar skills
Reactive Engine 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 |
|---|---|---|---|---|---|---|
| Reactive Engine this skillpetyosi/react-virtuoso | 6.5k | — | ~4.1k | Automated safety check: Pass | None | |
| React Useeffectviclafouch/meme-studio | 110 | — | ~375 | Automated safety check: Pass | None | |
| Web Artifacts Builderanthropics/skills | 180k | 41 repos | ~769 | Automated safety check: Pass | Apache-2.0 | |
| Tailwindcss Developmentanonaddy/anonaddy | 4.9k | 10 repos | ~865 | Automated safety check: Pass | MIT | |
| Core Component Library PatternsChrisWiles/claude-code-showcase | 6.1k | 8 repos | ~1.2k | Automated safety check: Pass | None | |
| React Router Developmentremix-run/react-router | 57k | 1 repos | ~1.5k | Automated safety check: Pass | MIT |
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Core Component Library Patterns
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Related
Categories
Questions about Reactive Engine
What does Reactive Engine do?
Manage application state with the @virtuoso.dev/reactive-engine- package family. Reactive Engine is an agent skill from petyosi/react-virtuoso.dev/reactive-engine- package family.
When should I use Reactive Engine?
Reactive Engine fits situations like: defining reactive state with Cell; wiring React components through EngineProvider; fetching data with Query and Mutation from reactive-engine-query; routing with Route.
How do I install Reactive Engine in Claude Code?
Run `npx skills add petyosi/react-virtuoso --skill reactive-engine -a claude-code`. Or copy the skill folder (skills/reactive-engine in petyosi/react-virtuoso) into .claude/skills/reactive-engine in your project. Claude Code loads it when a task matches its description.
How do I install Reactive Engine in Codex?
Run `npx skills add petyosi/react-virtuoso --skill reactive-engine -a codex`. Or copy the skill folder (skills/reactive-engine in petyosi/react-virtuoso) into .agents/skills/reactive-engine in your project. Codex loads it when a task matches its description.
Can I use Reactive Engine 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 petyosi/react-virtuoso --skill reactive-engine -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/reactive-engine, .gemini/skills/reactive-engine, .github/skills/reactive-engine and .opencode/skills/reactive-engine in your project.
What does Reactive Engine need to run?
SKILL.md names no scripts, command-line tools or credentials: Reactive Engine is instructions for the agent only.
Does Reactive Engine 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 Reactive Engine 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 Reactive Engine use?
No licence was found for Reactive Engine or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Reactive Engine use?
About 4.1k tokens (SKILL.md is roughly 17k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 22k tokens, read only when the agent opens those files.
What are the alternatives to Reactive Engine?
Skills that share tags, products or a category with Reactive Engine: React Useeffect (viclafouch/meme-studio, 110 stars), Web Artifacts Builder (anthropics/skills, 180k stars), Tailwindcss Development (anonaddy/anonaddy, 4.9k stars) and Core Component Library Patterns (ChrisWiles/claude-code-showcase, 6.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Reactive Engine?
petyosi (a GitHub user) maintains it in petyosi/react-virtuoso, which has 6,465 GitHub stars. The repository holds 5 skills in this directory. The repository was last updated on October 1, 2026.
Source: petyosi/react-virtuoso on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.