Synchronizing With Idle

Q: What is a Claude Code skill and how does the Synchronizing With Idle 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. Synchronizing With Idle is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Engineering · Sub-category: testing · Last updated: 2026-05-28

Use this skill to choose the right idle-synchronization primitive in Compose UI tests — waitForIdle, awaitIdle, waitUntil(conditionDescription, timeoutMillis, condition), waitUntilNodeCount, waitUntilExactlyOneExists, waitUntilAtLeastOneExists, waitUntilDoesNotExist, runOnIdle, runOnUiThread, runWhenIdle, awaitAndRunWhenIdle, hasPendingWork, and IdlingResource. Explains what "idle" means (no pending recomposition or draw, every IdlingResource isIdleNow), the wall-clock vs test-clock timeout split, the Espresso/Robolectric strategy bridge, and why direct state reads from the test thread race the recomposer. If the user mentions "test is flaky", "test passes locally fails on CI", "Thread.sleep waiting for state", "Espresso IdlingResource", "ComposeTimeoutException waitUntil", "AndroidComposeUiTestTimeoutException", waitUntilExactlyOneExists, runOnIdle, runWhenIdle, or "register IdlingResource", use this skill.

About this skill (catalog notes)

Synchronizing With Idle includes explicit scope boundaries (an explicit 'when not to use' or 'out of scope' section); a dedicated installation section; 16 code blocks for direct copy-paste. At roughly 2,343 words the SKILL.md is on the longer end of the catalog distribution.

License: Apache-2.0
Original author: skydoves
Indexed lastmod: 2026-05-28
Catalog position: Engineering · testing
Indexed related skills: 10

How Synchronizing With Idle fits the catalog

Synchronizing With Idle sits in the Engineering category under the testing sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

From the source SKILL.md

A Compose test that waits on the wrong primitive is the #1 source of flakiness. This skill enumerates every idle/wait API on ComposeTestRule and ComposeUiTest, locks down what "idle" actually means, and gives a decision matrix for choosing among them. Animation-specific waits live in ../testing-animations-deterministically/SKILL.md; the underlying clock semantics live in ../controlling-the-test-clock/SKILL.md.

What this skill does

Synchronizing With Idle is a community-contributed Claude Code skill in the testing sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/synchronizing-with-idle/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Synchronizing With Idle Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 93,000+ 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/synchronizing-with-idle
curl -L https://claudskills.com/skills/synchronizing-with-idle/SKILL.md \
  -o ~/.claude/skills/synchronizing-with-idle/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/synchronizing-with-idle/. Claude Code auto-discovers it on next session.

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

📱 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 Synchronizing With Idle Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/synchronizing-with-idle/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Synchronizing With Idle skill do?

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 Synchronizing With Idle skill?

Use Synchronizing With Idle when your Claude Code task falls under the Engineering category — specifically in the testing 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 Synchronizing With Idle" or describe the task and let Claude pick). Browse related skills at /category/engineering/.

What is a Claude Code skill and how does the Synchronizing With Idle 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. Synchronizing With Idle is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/skydoves/android-testing-skills/blob/HEAD/compose/synchronization/synchronizing-with-idle/SKILL.md
License: Apache-2.0
Author: skydoves

Cite this skill

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

APA

skydoves. (2026). Synchronizing With Idle [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/synchronizing-with-idle/

BibTeX

@misc{synchronizing-with-idle-2026,
  author    = {skydoves},
  title     = {Synchronizing With Idle [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/synchronizing-with-idle/}
}

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