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Agent skill

You Might Not Need A Memo

by simstudioai in simstudioai/sim

Analyze and fix useMemo/React.memo anti-patterns in your code

Apache-2.0Auto-check passed

Install You Might Not Need A Memo

skills CLI
$ npx skills add simstudioai/sim --skill you-might-not-need-a-memo -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install simstudioai/sim you-might-not-need-a-memo --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ 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-a-memo .claude/skills/you-might-not-need-a-memo && rm -rf skills-src

Use ~/.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/

Facts

Skill name
you-might-not-need-a-memo
GitHub stars
30k
Token cost
~657 tokens
SKILL.md length
359 words
Files
1
Skills in repo
40
Repo updated
First seen
Licence
Apache-2.0

At a glance

Analyze and fix useMemo/React.memo anti-patterns in your code

  • Works in 7 steps: Wrapping a slow component in React.memo… → Wrapping in React.memo when children can… → useMemo on cheap computations: Filtering… → …
  • SKILL.md covers References, Anti-patterns to detect, Patterns that ARE correct — do… and Steps
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

You Might Not Need A Memo is an agent skill from simstudioai/sim. Analyze and fix useMemo/React.memo anti-patterns in your code

Its SKILL.md is about 660 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It works with React. 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.

Example prompts

  • “/you-might-not-need-a-memo”

Workflow steps

7 steps, taken from the first numbered list in SKILL.md.

  1. Wrapping a slow component in React.memo when state can be moved down: If a component re-renders because of state it doesn't use, move that…
  2. Wrapping in React.memo when children can be lifted up: If a parent owns state that changes frequently, extract the stateful part and pass…
  3. useMemo on cheap computations: Filtering or mapping a small array, string concatenation, simple arithmetic — these don't need memoization…
  4. useMemo with constantly-changing deps: If the dependency array changes on every render, useMemo does nothing — it recalculates every time…
  5. useMemo to create objects/arrays passed as props: Instead of memoizing to prevent child re-renders, consider whether the child even needs…
  6. React.memo on components that always receive new props: If the parent always passes new objects, arrays, or callbacks, React.memo's…
  7. useMemo for derived state: If you're computing a value from props or state, just compute it inline during render. React renders are fast…

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):

    • overreacted.io

    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 A Memo loads about 657 tokens when it runs. Until then it costs about 22 tokens; SKILL.md has 359 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~22
When it runs · the whole SKILL.md, loaded when a task matches
~657

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). 359 words, ~657 tokens.

Download SKILL.mdSave it as .claude/skills/you-might-not-need-a-memo/SKILL.md (or your agent's skills folder).
name
you-might-not-need-a-memo
description
Analyze and fix useMemo/React.memo anti-patterns in your code
argument-hint
[scope] [fix=true|false]

You Might Not Need a Memo

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

References

Read before analyzing:

  1. https://overreacted.io/before-you-memo/ — two techniques to avoid memo entirely

Anti-patterns to detect

  1. Wrapping a slow component in React.memo when state can be moved down: If a component re-renders because of state it doesn't use, move that state into a smaller child component instead of memoizing. The slow component stops re-rendering without memo.
  2. Wrapping in React.memo when children can be lifted up: If a parent owns state that changes frequently, extract the stateful part and pass the expensive subtree as children. Children passed as props don't re-render when the parent's state changes.
  3. useMemo on cheap computations: Filtering or mapping a small array, string concatenation, simple arithmetic — these don't need memoization. Only memoize when you've measured a performance problem.
  4. useMemo with constantly-changing deps: If the dependency array changes on every render, useMemo does nothing — it recalculates every time. Fix the deps or remove the memo.
  5. useMemo to create objects/arrays passed as props: Instead of memoizing to prevent child re-renders, consider whether the child even needs referential stability. If the child doesn't use React.memo or pass it to a dep array, the memo is wasted.
  6. React.memo on components that always receive new props: If the parent always passes new objects, arrays, or callbacks, React.memo's shallow comparison always fails. Fix the parent instead of memoizing the child.
  7. useMemo for derived state: If you're computing a value from props or state, just compute it inline during render. React renders are fast. const fullName = first + ' ' + last doesn't need useMemo.
Show full SKILL.md (65 more words)Show less

Patterns that ARE correct — do not flag

  • A useMemo that builds a lookup Map/Set or a single-pass partition for list rendering (.claude/rules/sim-components.md "List-render performance").

Steps

  1. Read the reference above to understand the two core techniques (move state down, lift content up)
  2. Analyze the specified scope for the anti-patterns listed above
  3. 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-a-memo of simstudioai/sim.

Open the folder on GitHubat commit 546d4e7

Compare with similar skills

You Might Not Need A Memo 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.

You Might Not Need A Memo compared with similar skills
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React Composition Patternsvercel-labs/openreview1.7k58 repos~721Automated safety check: PassMIT
React Router Developmentremix-run/react-router57k1 repos~1.5kAutomated safety check: PassMIT
Electron Multi-Process ArchitectureiOfficeAI/AionUi33k1 repos~1.8kAutomated safety check: PassApache-2.0

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Works with

Questions about You Might Not Need A Memo

What does You Might Not Need A Memo do?

Analyze and fix useMemo/React.memo anti-patterns in your code. You Might Not Need A Memo is an agent skill from simstudioai/sim.

How do I install You Might Not Need A Memo in Claude Code?

Run `npx skills add simstudioai/sim --skill you-might-not-need-a-memo -a claude-code`. Or copy the skill folder (.agents/skills/you-might-not-need-a-memo in simstudioai/sim) into .claude/skills/you-might-not-need-a-memo in your project. Claude Code loads it when a task matches its description.

How do I install You Might Not Need A Memo in Codex?

Run `npx skills add simstudioai/sim --skill you-might-not-need-a-memo -a codex`. Or copy the skill folder (.agents/skills/you-might-not-need-a-memo in simstudioai/sim) into .agents/skills/you-might-not-need-a-memo in your project. Codex loads it when a task matches its description.

Can I use You Might Not Need A Memo 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-a-memo -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-a-memo, .gemini/skills/you-might-not-need-a-memo, .github/skills/you-might-not-need-a-memo and .opencode/skills/you-might-not-need-a-memo in your project.

What does You Might Not Need A Memo need to run?

SKILL.md names no scripts, command-line tools or credentials: You Might Not Need A Memo is instructions for the agent only.

Does You Might Not Need A Memo access the network?

SKILL.md names 1 domain. As links in the text: overreacted.io. This is read from the text; nothing was executed.

Is You Might Not Need A Memo 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 A Memo use?

You Might Not Need A Memo 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 A Memo use?

About 657 tokens (SKILL.md is roughly 2.6k 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 A Memo?

Skills that share tags, products or a category with You Might Not Need A Memo: Web Artifacts Builder (anthropics/skills, 180k stars), React Doctor (makeplane/plane, 60k stars), React Composition Patterns (vercel-labs/openreview, 1.7k stars) and React Router Development (remix-run/react-router, 57k 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 A Memo?

simstudioai (a GitHub organization) maintains it in simstudioai/sim, which has 29,785 GitHub stars. The repository holds 40 skills in this directory. The repository was last updated on October 7, 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.