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-acceptnpx skills add Chachamaru127/claude-code-harness --skill harness-acceptgit 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-accept)<a href="https://agentmods.dev/skills/chachamaru127/claude-code-harness/harness-accept"><img src="https://agentmods.dev/badge/skills/chachamaru127/claude-code-harness/harness-accept.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 5.1 | $0.00145 | $0.04984 |
| Opus 5 | $0.00072 | $0.02492 |
| Sonnet 5 | $0.00029 | $0.00997 |
| Haiku 4.5 | $0.00015 | $0.00498 |
Grade A, and why
harness-accept 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 6d 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 — 307 lines — stays where its author put it; the contents beside it link to each section on GitHub.
harness-accept
非エンジニアの発注者・プロデューサー職向けに、実装完了タスクの受け入れ判断 (ship / wait / reject) を HTML 1 枚 で提示するスキル。 発注者の認知負荷ピーク (3) 受け入れ判断の段階で使う。
Phase 65.1.x (harness-plan-brief) の対構造として動作し、Plan Brief で承認した acceptance_criteria を read 側で取り戻して評価する。
Quick Reference
- 「Acceptance Demo を作って」 → このスキル
- 「受け入れ判断したい」 → このスキル
- 「ship/wait/reject 判定」 → このスキル
責任境界
| 範囲 | このスキルの責務 |
|---|---|
| 検索 | 現プロジェクトのみ (project: <current>, strict_project: true を必ず指定) |
| クロスプロジェクト | やらない (Phase 65.3 以降で --cross-project-group <name> flag で opt-in 解放) |
| Plan Brief 連携 | user_request_hash を join key として personal-preference.v1 (Phase 65.1.4) を read |
| 書き込み | やらない (Acceptance 承認後の memory write は accept-record-decision.sh の責務) |
| recommendation 算出 | verified / 全 criteria の比率で 0.8 / 0.5 閾値判定。ロジックは scripts/render-html.sh 直前で計算 |
入力
引数 [task-description] にユーザーの request を渡す (Plan Brief 時と同じ文を使う)。
引数なしの場合は対話形式で受け取る。
出力
| 出力 | パス | 形式 |
|---|---|---|
| Acceptance Demo HTML | .claude/state/views/accept-<timestamp>.html |
単独で開ける HTML (no server, no JS framework) |
| Acceptance context JSON | .claude/state/views/accept-<timestamp>.context.json |
acceptance-context.v1 schema |
Schema: acceptance-context.v1
{
"schema": "acceptance-context.v1",
"user_request": "string",
"user_request_hash": "sha256 hex (Plan Brief 側の personal-preference.v1 と join)",
"demo_artifacts": [
{ "kind": "video|screenshot|text", "path": "string" }
],
"verified_criteria": [
{ "name": "string", "passed": true, "evidence": "string" }
],
"tdd_verified": "yes|no|not-required|skip:<reason>",
"unverified_caveats": ["string"],
"past_issue_patterns": [
{ "pattern_id": "P5", "title": "string", "verified_in_current_task": true }
],
"recommendation": "ship|wait|reject",
"recommendation_evidence": ["string"],
"project": "string",
"generated_at": "ISO8601",
"blind_evaluation": {
"applicable": true,
"eligibility_reason": "persuasive-doc|functional-skip|not_applicable|unavailable",
"audience_purpose_line": "string",
"evaluator_believable": "believable|not_believable|uncertain",
"evaluator_useful": "useful|not_useful|uncertain",
"evaluator_friction_points": ["string"],
"internal_recommendation": "ship|wait|reject",
"divergence": "none|internal_high_evaluator_low|internal_low_evaluator_high",
"divergence_notes": "string"
}
}
What ships with it
2 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.
- 6d ago First seen · 307 lines · 145 tokens per session scan A ba365958064b
harness-accept is a skill published in the GitHub repository Chachamaru127/claude-code-harness (3,087 stars, last pushed 5d ago), licensed MIT. It adds 145 tokens to every session and 4,984 once invoked, about $0.0007 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.
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