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Harness Boundary

Category: General  ·  Sub-category: ai-tooling  ·  Last updated:
agent 環境に mechanism（rule / skill / hook / agent / workflow / runtime 拡張 / prompt chain）を追加・変更・レビューするとき、それが 6 層（model capability / skill = 手続き記憶 / values・policy / eval / data・memory / runtime）のどこに属するか、なぜモデル自身に任せられないか、次のモデル世代で不要になるか、runtime を Claude Code → Pi → Codex と交換しても残す価値があるかを問い、Keep / Move / Simplify / Make temporary / Delete / Defer を返す設計レンズ。Use when — 「これはハーネスに入れるべきか」「どの層に置くか」「モデルに任せられないか」「runtime 変えても残るか」「harness が肥大している」「この hook / rule / workflow を足していい？」, when implementation-chain の Plan で harness 自体（~/.claude の rules / skills / hooks / agents / settings）を変更する task と判定されたとき, or /harness-boundary. Delete / Simplify は成功として扱う。NOT for — 未構築物の build-or-not 単体（→ agent architect）、設置済み資産の定期監査と Retire / Dissolve の verdict（→ rules-stocktake / skill-stocktake / agent-stocktake。本 skill は証拠を渡すだけ）、世代交代時の一括照合（→ generation-audit）、loop 構造の妥当性（→ loop-design-check）、harness の作り方の処方（→ agent-harness-construction）。
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From the source SKILL.md

「ハーネスこそ資産」は半分しか正しくない。モデル固有の弱点を補う harness logic は モデル世代ごとに陳腐化し、runtime（tool 実行・permission・state・retry・agent loop）は 標準化と置換が進む。残るのは harness の中に混在している別の層だ。この skill は mechanism を追加・変更・レビューするときに、その混在を分解するための問いを出す。

What this skill does

Harness Boundary is a community-contributed Claude Code skill in the ai-tooling sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/harness-boundary/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when — 「これはハーネスに入れるべきか」「どの層に置くか」「モデルに任せられないか」「runtime 変えても残るか」「harness が肥大している」「この hook / rule / workflow を足していい？」, when implementation-chain の Plan で harness 自体（~/.claude の rules / skills / hooks / agents / settings）を変更する task と判定されたとき, or /harness-boundary.

Who uses this skill

The Harness Boundary 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 196,000+ 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/harness-boundary
curl -L https://claudskills.com/skills/harness-boundary/SKILL.md \
  -o ~/.claude/skills/harness-boundary/SKILL.md

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

Skills live at ~/.claude/skills/harness-boundary/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\harness-boundary\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 Harness Boundary Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/harness-boundary/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Harness Boundary skill do?
agent 環境に mechanism（rule / skill / hook / agent / workflow / runtime 拡張 / prompt chain）を追加・変更・レビューするとき、それが 6 層（model capability / skill = 手続き記憶 / values・policy / eval / data・memory / runtime）のどこに属するか、なぜモデル自身に任せられないか、次のモデル世代で不要になるか、runtime を Claude Code → Pi → Codex と交換しても残す価値があるかを問い、Keep / Move / Simplify / Make temporary / Delete / Defer を返す設計レンズ。Use when — 「これはハーネスに入れるべきか」「どの層に置くか」「モデルに任せられないか」「runtime 変えても残るか」「harness が肥大している」「この hook / rule / workflow を足していい？」, when implementation-chain の Plan で harness 自体（~/.claude の rules / skills / hooks / agents / settings）を変更する task と判定されたとき, or /harness-boundary. Delete / Simplify は成功として扱う。NOT for — 未構築物の build-or-not 単体（→ agent architect）、設置済み資産の定期監査と Retire / Dissolve の verdict（→ rules-stocktake / skill-stocktake / agent-stocktake。本 skill は証拠を渡すだけ）、世代交代時の一括照合（→ generation-audit）、loop 構造の妥当性（→ loop-design-check）、harness の作り方の処方（→ agent-harness-construction）。
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 Harness Boundary skill?
Use Harness Boundary when your Claude Code task falls under the General category — specifically in the ai tooling 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 Harness Boundary" or describe the task and let Claude pick). Browse related skills at /category/general/.
What is a Claude Code skill and how does the Harness Boundary 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. Harness Boundary 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
shimo4228. (2026). Harness Boundary [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/harness-boundary/
BibTeX
@misc{harness-boundary-2026,
  author    = {shimo4228},
  title     = {Harness Boundary [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/harness-boundary/}
}

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Grade A · scanned 2026-09-28 — free static scan against the OWASP Agentic Skills Top 10.

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