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Avoiding Subcomposition Pitfalls

Category: General  ·  Sub-category: general-misc  ·  Last updated:
type:generator
Use this skill when a Compose tree uses SubcomposeLayout, BoxWithConstraints, or Scaffold and the developer reports extra measure passes, slow first frame, or layout passes running content composition repeatedly. Covers why SubcomposeLayout composes its slots during the measure phase, why BoxWithConstraints forces a subcomposition for every new Constraints value, why nesting Scaffold or BoxWithConstraints multiplies the cost, when a custom Layout or Modifier.layout { } replaces SubcomposeLayout, and how to use SubcomposeLayoutState's slot reuse policy and precompose APIs when SubcomposeLayout is genuinely required. Use when the developer mentions BoxWithConstraints, SubcomposeLayout, Scaffold, "extra measure pass", "double measurement", "first frame slow", "subcompose", or notices that wrapping content in BoxWithConstraints regresses scroll perf inside a LazyColumn.
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From the source SKILL.md

SubcomposeLayout runs its content's composition during the measure pass, not during the parent's composition pass. That trades extra layout cost for the ability to use measured constraints inside the children's composition. BoxWithConstraints, material3.Scaffold, and the lazy layouts are all built on top of it, so the cost is invisible until it nests or lands inside a hot path. This skill teaches Claude how to detect the misuse, how to replace SubcomposeLayout with a cheaper primitive when its power is not needed, and how to keep it efficient when it is.

What this skill does

Avoiding Subcomposition Pitfalls is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/avoiding-subcomposition-pitfalls/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the developer mentions BoxWithConstraints, SubcomposeLayout, Scaffold, "extra measure pass", "double measurement", "first frame slow", "subcompose", or notices that wrapping content in BoxWithConstraints regresses scroll perf inside a LazyColumn.

Who uses this skill

The Avoiding Subcomposition Pitfalls Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 146,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/avoiding-subcomposition-pitfalls
curl -L https://claudskills.com/skills/avoiding-subcomposition-pitfalls/SKILL.md \
  -o ~/.claude/skills/avoiding-subcomposition-pitfalls/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/avoiding-subcomposition-pitfalls/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/avoiding-subcomposition-pitfalls/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\avoiding-subcomposition-pitfalls\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Avoiding Subcomposition Pitfalls Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/avoiding-subcomposition-pitfalls/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Avoiding Subcomposition Pitfalls skill do?
Use this skill when a Compose tree uses SubcomposeLayout, BoxWithConstraints, or Scaffold and the developer reports extra measure passes, slow first frame, or layout passes running content composition repeatedly. Covers why SubcomposeLayout composes its slots during the measure phase, why BoxWithConstraints forces a subcomposition for every new Constraints value, why nesting Scaffold or BoxWithConstraints multiplies the cost, when a custom Layout or Modifier.layout { } replaces SubcomposeLayout, and how to use SubcomposeLayoutState's slot reuse policy and precompose APIs when SubcomposeLayout is genuinely required. Use when the developer mentions BoxWithConstraints, SubcomposeLayout, Scaffold, "extra measure pass", "double measurement", "first frame slow", "subcompose", or notices that wrapping content in BoxWithConstraints regresses scroll perf inside a LazyColumn.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Avoiding Subcomposition Pitfalls skill?
Use Avoiding Subcomposition Pitfalls when your Claude Code task falls under the General category — specifically in the general misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Avoiding Subcomposition Pitfalls" or describe the task and let Claude pick). Browse related skills at /category/general/.
What is a Claude Code skill and how does the Avoiding Subcomposition Pitfalls skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Avoiding Subcomposition Pitfalls is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
skydoves. (2026). Avoiding Subcomposition Pitfalls [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/avoiding-subcomposition-pitfalls/
BibTeX
@misc{avoiding-subcomposition-pitfalls-2026,
  author    = {skydoves},
  title     = {Avoiding Subcomposition Pitfalls [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/avoiding-subcomposition-pitfalls/}
}

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Security scan

Grade A · scanned 2026-07-06 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 1 of 10 categories (filesystem), including lower-severity patterns. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

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