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Liveness Check

Category: Product  ·  Sub-category: ux-research  ·  Last updated:
type:debug
Diagnose whether a team agent's tmux session is alive, in a long turn, or silently dead — and respawn it preserving context if dead. Owned by the Dottore (the team's roving health-check agent), not by the Captain. The core failure mode this skill catches: `jht-tmux-send` returns `exit 0` even when the target CLI has crashed (the message is written into a bare bash, then lost). Without periodic liveness checks the team keeps \"talking to a corpse\" and the Captain counts on actions that will never happen.
Security BStatic scan: minor findingsHow grading works ›

From the source SKILL.md

A tmux session can survive its CLI. When the Codex / Kimi TUI crashes, tmux falls back to a bare bash prompt; messages keep being written into it (exit 0 from jht-tmux-send), nobody reads them, the agent is a zombie. This skill detects the state and recovers.

What this skill does

Liveness Check is a community-contributed Claude Code skill in the ux-research sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/liveness-check/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Liveness Check Claude Code skill is built for product managers, product designers, and cross-functional teams planning, shipping, and measuring product features. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 158,000+ 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/liveness-check
curl -L https://claudskills.com/skills/liveness-check/SKILL.md \
  -o ~/.claude/skills/liveness-check/SKILL.md

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

Skills live at ~/.claude/skills/liveness-check/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\liveness-check\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 Liveness Check Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/liveness-check/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Liveness Check skill do?
Diagnose whether a team agent's tmux session is alive, in a long turn, or silently dead — and respawn it preserving context if dead. Owned by the Dottore (the team's roving health-check agent), not by the Captain. The core failure mode this skill catches: `jht-tmux-send` returns `exit 0` even when the target CLI has crashed (the message is written into a bare bash, then lost). Without periodic liveness checks the team keeps \"talking to a corpse\" and the Captain counts on actions that will never happen.
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 Liveness Check skill?
Use Liveness Check when your Claude Code task falls under the Product category — specifically in the ux research 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 Liveness Check" or describe the task and let Claude pick). Browse related skills at /category/product/.
What is a Claude Code skill and how does the Liveness Check 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. Liveness Check is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Product 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
leopu00. (2026). Liveness Check [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/liveness-check/
BibTeX
@misc{liveness-check-2026,
  author    = {leopu00},
  title     = {Liveness Check [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/liveness-check/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge
[![ClaudSkills](https://claudskills.com/badge/liveness-check.svg)](https://claudskills.com/skills/liveness-check/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)
<script>
<script src="https://claudskills.com/embed/liveness-check.js" async></script>
<iframe>
<iframe src="https://claudskills.com/embed/liveness-check.html" width="100%" height="160" frameborder="0" loading="lazy" title="ClaudSkills: Liveness Check"></iframe>

Security scan

Grade B · scanned 2026-07-23 — free static scan against the OWASP Agentic Skills Top 10.

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

Show this grade on your repo (click to copy):

[![Security: B](https://img.shields.io/badge/Security-B-558b2f)](https://claudskills.com/skills/liveness-check/#security)

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