Borrowing it
Nothing to install: this file belongs to sei-newbear/xp-harness. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/sei-newbear/xp-harness/main/.apm/skills/implementation/SKILL.mdgit clone --depth 1 https://github.com/sei-newbear/xp-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/sei-newbear/xp-harness/implementation)<a href="https://agentmods.dev/skills/sei-newbear/xp-harness/implementation"><img src="https://agentmods.dev/badge/skills/sei-newbear/xp-harness/implementation/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/sei-newbear/xp-harness/implementation"><img src="https://agentmods.dev/badge/skills/sei-newbear/xp-harness/implementation.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00132 | $0.00587 |
| Opus 5.5 | $0.00053 | $0.00235 |
| Sonnet 5.5 | $0.00026 | $0.00117 |
| Haiku 4.5 | $0.00013 | $0.00059 |
Grade A, and why
implementation 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 2mo 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.
What it actually says
実装の規約とアーキテクチャ
プロジェクト固有のコード規約・アーキテクチャ方針を実装に効かせるためのスキル。「どう進めるか」(リズム・分割) ではなく、「コードが何を満たすか」(規約・構造) を扱う。規約そのものはプロジェクト側にあり、このスキルはそれを探して効かせる入口。
関連する実装の規約・アーキテクチャ方針を探して従う
このスキルが呼ばれるたびに、以下を行う（1 つの作業の中で触る範囲が別の領域に移ったら、その都度やり直す）:
- 触る範囲を特定する: いま読み書きしようとしているファイルのディレクトリ / 領域を特定する（例: front 配下と api 配下で規約が分かれている場合、どちらの領域の作業かを特定する）
- 範囲に対応する規約・アーキテクチャ方針を探す:
- セッションに登録されているスキル（このスキル自身を除く）にその範囲の実装規約を扱うものがあれば、（参照して読むのではなく）スキルとして呼ぶ
- スキルでない規約ファイル（その領域のディレクトリ配下の CLAUDE.md / AGENTS.md 等のドキュメント）があれば、読む
- 見つけた規約・アーキテクチャ方針に従って作業する
- 見つからなければ、規約をでっち上げない: 一般に良いとされる判断で進める
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.
- 2mo ago First seen · 20 lines · 132 tokens per session scan A 588ae0c38644
implementation is a skill published in the GitHub repository sei-newbear/xp-harness (9 stars, last pushed 1mo ago), licensed MIT. It adds 132 tokens to every session and 587 once invoked, about $0.0005 per session on Opus 5.5. 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 2026-08-31.
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