React State Management
involvex/youtube-music-cli
Master modern React state management with Redux Toolkit, Zustand, Jotai, and React Query.
Analyze and fix unnecessary useState, derived state, and server-state-in-local-state anti-patterns
Install You Might Not Need State
$ npx skills add simstudioai/sim --skill you-might-not-need-state -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install simstudioai/sim you-might-not-need-state --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/simstudioai/sim.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/you-might-not-need-state .claude/skills/you-might-not-need-state && 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 "you-might-not-need-state" agent skill from https://github.com/simstudioai/sim/tree/main/.agents/skills/you-might-not-need-state into .claude/skills/you-might-not-need-state/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "you-might-not-need-state", 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/simstudioai/sim/tree/main/.agents/skills/you-might-not-need-stateType 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 simstudioai/sim --skill you-might-not-need-state -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install simstudioai/sim you-might-not-need-state --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/simstudioai/sim.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/you-might-not-need-state .agents/skills/you-might-not-need-state && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "you-might-not-need-state" agent skill from https://github.com/simstudioai/sim/tree/main/.agents/skills/you-might-not-need-state into .agents/skills/you-might-not-need-state/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "you-might-not-need-state", 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 simstudioai/sim --skill you-might-not-need-state -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install simstudioai/sim you-might-not-need-state --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/simstudioai/sim.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/you-might-not-need-state .cursor/skills/you-might-not-need-state && 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 "you-might-not-need-state" agent skill from https://github.com/simstudioai/sim/tree/main/.agents/skills/you-might-not-need-state into .cursor/skills/you-might-not-need-state/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "you-might-not-need-state", 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/simstudioai/sim.git --path .agents/skills/you-might-not-need-state--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 simstudioai/sim --skill you-might-not-need-state -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install simstudioai/sim you-might-not-need-state --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/simstudioai/sim.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/you-might-not-need-state .gemini/skills/you-might-not-need-state && 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 "you-might-not-need-state" agent skill from https://github.com/simstudioai/sim/tree/main/.agents/skills/you-might-not-need-state into .gemini/skills/you-might-not-need-state/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "you-might-not-need-state", 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 simstudioai/sim you-might-not-need-stateInstalls 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 simstudioai/sim --skill you-might-not-need-state -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/simstudioai/sim.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/you-might-not-need-state .github/skills/you-might-not-need-state && 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 "you-might-not-need-state" agent skill from https://github.com/simstudioai/sim/tree/main/.agents/skills/you-might-not-need-state into .github/skills/you-might-not-need-state/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "you-might-not-need-state", 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 simstudioai/sim --skill you-might-not-need-state -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install simstudioai/sim you-might-not-need-state --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/simstudioai/sim.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/you-might-not-need-state .opencode/skills/you-might-not-need-state && 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 "you-might-not-need-state" agent skill from https://github.com/simstudioai/sim/tree/main/.agents/skills/you-might-not-need-state into .opencode/skills/you-might-not-need-state/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "you-might-not-need-state", 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
you-might-not-need-state- GitHub stars
- 30k
- Token cost
- ~672 tokens
- SKILL.md length
- 342 words
- Files
- 1
- Skills in repo
- 40
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Analyze and fix unnecessary useState, derived state, and server-state-in-local-state anti-patterns
- Works in 3 steps: https://react.dev/learn/choosing-the-stat… → https://tkdodo.eu/blog/dont-over-use-stat… → https://tkdodo.eu/blog/putting-props-to-u…
- Frontend & Design work in your project
- SKILL.md covers Context, References, Anti-patterns to detect and Steps
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
You Might Not Need State is an agent skill from simstudioai/sim. Analyze and fix unnecessary useState, derived state, and server-state-in-local-state anti-patterns
Its SKILL.md is about 670 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. It works with TanStack and Zustand. The repository describes itself as: Sim is the collaborative workspace to build, deploy, and monitor AI agents and workflows. Used by 100,000+ builders. The licence is Apache-2.0.
When your agent uses it
- Frontend & Design work in your project
Example prompts
- “/you-might-not-need-state”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- https://react.dev/learn/choosing-the-state-structure — 5 principles for structuring state
- https://tkdodo.eu/blog/dont-over-use-state — never store derived/computed values in state
- https://tkdodo.eu/blog/putting-props-to-use-state — never mirror props into state via useEffect
What it can do on your machine
Read from SKILL.md and the folder at commit 546d4e7. 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.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
tkdodo.eureact.dev
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
You Might Not Need State loads about 672 tokens when it runs. Until then it costs about 31 tokens; SKILL.md has 342 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
The full file from simstudioai/sim at commit 546d4e7, republished under its Apache-2.0 licence (© simstudioai). 342 words, ~672 tokens.
Download SKILL.mdSave it as
.claude/skills/you-might-not-need-state/SKILL.md (or your agent's skills folder).- name
- you-might-not-need-state
- description
- Analyze and fix unnecessary useState, derived state, and server-state-in-local-state anti-patterns
- argument-hint
- [scope] [fix=true|false]
You Might Not Need State
Arguments:
- scope: what to analyze (default: your current changes). Examples: "diff to main", "PR #123", "src/components/", "whole codebase"
- fix: whether to apply fixes (default: true). Set to false to only propose changes.
User arguments: $ARGUMENTS
Context
React Query owns server data, nuqs (URL) owns shareable view-state (tabs, filters, search, sort, pagination, selected id), Zustand owns global client state, and useState owns only ephemeral UI (open/closed, hover, local form input). Server data should never be copied into useState or Zustand — React Query is the single source of truth.
References
Read these before analyzing:
- https://react.dev/learn/choosing-the-state-structure — 5 principles for structuring state
- https://tkdodo.eu/blog/dont-over-use-state — never store derived/computed values in state
- https://tkdodo.eu/blog/putting-props-to-use-state — never mirror props into state via useEffect
Anti-patterns to detect
- Derived state stored in useState: If a value can be computed from props, other state, or query data, compute it inline during render instead of storing it in state.
- Server state copied into useState: Never
useState+useEffectto sync React Query data into local state. Use query data directly. The only exception is forms where users edit server data. - Props mirrored into state: Never
useState(prop)+useEffect(() => setState(prop)). Use the prop directly, reset with a remountkey, or — for seed-on-transition (e.g. a modal opening) — adjust during render with theuseStateprev-tracker in.claude/rules/sim-hooks.md"State shape" (mind its sentinel-on-mount and no-useRefrules). - Chained useEffect state updates: Never chain Effects that set state to trigger other Effects. Calculate all derived values in the event handler or inline during render.
- Storing objects when an ID suffices: Store
selectedIdnot a copy of the selected object. Derive the object:items.find(i => i.id === selectedId). - State that duplicates Zustand or React Query: If the data already lives in a store or query cache, don't create a parallel useState.
- Shareable view-state in useState: hand off to
/you-might-not-need-url-state.
Steps
- Read the references above to understand the guidelines
- Analyze the specified scope for the anti-patterns listed above
- If fix=true, apply the fixes. If fix=false, propose the fixes without applying.
© simstudioai, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .agents/skills/you-might-not-need-state of simstudioai/sim.
Open the folder on GitHubat commit 546d4e7
Compare with similar skills
You Might Not Need State 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 |
|---|---|---|---|---|---|---|
| You Might Not Need State this skillsimstudioai/sim | 30k | — | ~672 | Automated safety check: Pass | Apache-2.0 | |
| React State Managementinvolvex/youtube-music-cli | 456 | 13 repos | ~3k | Automated safety check: Pass | MIT | |
| I18nhuoshen80/ReinaManager | 693 | — | ~177 | Automated safety check: Pass | AGPL-3.0 | |
| Nextjs15 Initbear2u/my-skills | 933 | — | ~2.4k | Automated safety check: Pass | None | |
| Opik Frontend Patternscomet-ml/opik | 22k | — | ~1.1k | Automated safety check: Pass | Apache-2.0 | |
| Frontend Testhuoshen80/ReinaManager | 693 | — | ~180 | Automated safety check: Pass | AGPL-3.0 |
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Related
Categories
Questions about You Might Not Need State
What does You Might Not Need State do?
Analyze and fix unnecessary useState, derived state, and server-state-in-local-state anti-patterns. You Might Not Need State is an agent skill from simstudioai/sim.
When should I use You Might Not Need State?
You Might Not Need State fits situations like: frontend & Design work in your project.
How do I install You Might Not Need State in Claude Code?
Run `npx skills add simstudioai/sim --skill you-might-not-need-state -a claude-code`. Or copy the skill folder (.agents/skills/you-might-not-need-state in simstudioai/sim) into .claude/skills/you-might-not-need-state in your project. Claude Code loads it when a task matches its description.
How do I install You Might Not Need State in Codex?
Run `npx skills add simstudioai/sim --skill you-might-not-need-state -a codex`. Or copy the skill folder (.agents/skills/you-might-not-need-state in simstudioai/sim) into .agents/skills/you-might-not-need-state in your project. Codex loads it when a task matches its description.
Can I use You Might Not Need State 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 simstudioai/sim --skill you-might-not-need-state -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/you-might-not-need-state, .gemini/skills/you-might-not-need-state, .github/skills/you-might-not-need-state and .opencode/skills/you-might-not-need-state in your project.
What does You Might Not Need State need to run?
SKILL.md names no scripts, command-line tools or credentials: You Might Not Need State is instructions for the agent only.
Does You Might Not Need State access the network?
SKILL.md names 2 domains. As links in the text: tkdodo.eu and react.dev. This is read from the text; nothing was executed.
Is You Might Not Need State 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 You Might Not Need State use?
You Might Not Need State is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does You Might Not Need State use?
About 672 tokens (SKILL.md is roughly 2.7k 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 You Might Not Need State?
Skills that share tags, products or a category with You Might Not Need State: React State Management (involvex/youtube-music-cli, 456 stars), I18n (huoshen80/ReinaManager, 693 stars), Nextjs15 Init (bear2u/my-skills, 933 stars) and Opik Frontend Patterns (comet-ml/opik, 22k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains You Might Not Need State?
simstudioai (a GitHub organization) maintains it in simstudioai/sim, which has 29,792 GitHub stars. The repository holds 40 skills in this directory. The repository was last updated on October 8, 2026.
Source: simstudioai/sim on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.