Claude Code Harness is a development workflow for coding agents that organizes work into planning, implementation, review, synchronization, and release stages. It helps developers keep specifications, tests, independent reviews, and release evidence connected while using tools such as Claude Code, Codex CLI, Cursor, or Grok.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/chachamaru127/claude-code-harness/harness-setupnpx skills add Chachamaru127/claude-code-harness --skill harness-setupgit clone --depth 1 https://github.com/Chachamaru127/claude-code-harnessWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/chachamaru127/claude-code-harness/harness-setup)<a href="https://agentmods.dev/skills/chachamaru127/claude-code-harness/harness-setup"><img src="https://agentmods.dev/badge/skills/chachamaru127/claude-code-harness/harness-setup.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00057 | $0.01770 |
| Opus 5 | $0.00028 | $0.00885 |
| Sonnet 5 | $0.00011 | $0.00354 |
| Haiku 4.5 | $0.00006 | $0.00177 |
Grade A, and why
harness-setup scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Harness Setup
Harness の統合セットアップスキル。 以下の旧スキルを統合:
setup— 統合セットアップハブharness-init— プロジェクト初期化harness-update— Harness アップデートmaintenance— ファイル整理・クリーンアップ
Quick Reference
| サブコマンド | 動作 | 詳細 |
|---|---|---|
/harness-setup init |
新規プロジェクト初期化（CLAUDE.md + Plans.md + hooks + sync + doctor） | ${CLAUDE_SKILL_DIR}/references/init.md |
/harness-setup ci |
CI/CD パイプライン設定 | ${CLAUDE_SKILL_DIR}/references/ci.md |
/harness-setup codex |
Codex CLI インストール・設定 | ${CLAUDE_SKILL_DIR}/references/codex.md |
/harness-setup harness-mem |
harness-mem 統合・メモリ設定 | ${CLAUDE_SKILL_DIR}/references/harness-mem.md |
/harness-setup mirrors |
skills/ → 公開 mirror bundle 更新 | ${CLAUDE_SKILL_DIR}/references/mirrors-agents-localize.md |
/harness-setup agents |
agents/ エージェント設定 | ${CLAUDE_SKILL_DIR}/references/mirrors-agents-localize.md |
/harness-setup localize |
CLAUDE.md ルールのローカライズ | ${CLAUDE_SKILL_DIR}/references/mirrors-agents-localize.md |
| marketplace / update | Plugin install, update, dependency policy | ${CLAUDE_SKILL_DIR}/references/marketplace.md |
| maintenance | ファイル整理・クリーンアップ | ${CLAUDE_SKILL_DIR}/references/maintenance.md |
Built-in slash discovery (CC 2.1.108+):
/initのような built-in slash command も発見される。 Harness 固有の bootstrap が必要な時だけ/harness-setup initと使い分ける。
Claude Code setup guidance (CC 2.1.120+): MCP
alwaysLoad、${CLAUDE_EFFORT}、claude plugin prune、claude project purge、ANTHROPIC_BEDROCK_SERVICE_TIER、claude_code.skill_activated.invocation_trigger、 Windows PowerShell primary shell、forked skills / subagents の deferred tools はdocs/claude-code-setup-mcp-telemetry-provider.mdを正本として扱う。
Codex plugin workflows: Codex
/goalとPlans.mdを二重管理しない。 plugin-bundled hooks は opt-in、external agent import は ownership 明記、 MultiAgentV2 /agents.max_threads = 8は上限として扱い、 sticky environments / app-server artifacts は safe default を優先する。 Codex0.130.0stable のcodex remote-control、large thread pagination、 selected-environmentview_image、live app-server config refresh、 accurate turn diffs、plugin details bundled hooks、sharing discoverability controls はdocs/codex-plugin-workflows-policy.mdを正本として扱う。 詳細はdocs/codex-plugin-workflows-policy.mdと${CLAUDE_SKILL_DIR}/references/codex.mdを参照。
What ships with it
8 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 102 lines · 57 tokens per session scan A a39ba07a3eed
harness-setup is a skill published in the GitHub repository Chachamaru127/claude-code-harness (3,082 stars, last pushed 4d ago), licensed MIT. It adds 57 tokens to every session and 1,770 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
media-ingest
Ingest video, audio, PDF, book, screenshot, and GitHub repo content into the brain. Multi-format handling with entity extraction and backlink propagation. Covers video-ingest, youtube-ingest, and book-ingest subtypes.
mem0-oss-to-platform
Plan and then execute a migration of a project from the mem0 open-source / self-hosted SDK (the local Memory class) to the mem0 Platform / hosted / managed SDK (the MemoryClient class). Use this whenever a developer wants to move, switch, or migrate their mem0 usage off OSS/self-hosted to the hosted API — e.g.…
Cortex
Operate Cortex, the LifeOS memory system — the typed Knowledge Archive (People, Companies, Ideas, Research with typed related: links) plus recall of prior work sessions, ISAs, and conversations. Search, add, harvest, develop, ingest, distill, graph-navigate, recall. USE WHEN cortex, knowledge, knowledge base, search…
agent-memory
../../../engineering/agent-memory/skills/agent-memory/SKILL.md.
memory
Use when the user asks to remember, recall, forget, update, search, or inspect durable OpenSquilla memory, including profile facts in USER.md and long-term notes in MEMORY.md or memory//.md.
ha-data-stores
Map of Hope Agent's local data stores and safe read-only query workflow. Use when the user asks where Hope Agent stores data, wants to inspect sessions/messages/memory/logs/background jobs/knowledge indexes/settings, asks the model to query local app data, or debugging requires checking persisted state. Trigger…