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/s977043/plangate/codex-mvp-splitnpx skills add s977043/PlanGate --skill codex-mvp-splitgit clone --depth 1 https://github.com/s977043/PlanGateWrote 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/s977043/plangate/codex-mvp-split)<a href="https://agentmods.dev/skills/s977043/plangate/codex-mvp-split"><img src="https://agentmods.dev/badge/skills/s977043/plangate/codex-mvp-split.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 | $0.00087 | $0.01535 |
| Opus 5 | $0.00044 | $0.00767 |
| Sonnet 5 | $0.00017 | $0.00307 |
| Haiku 4.5 | $0.00009 | $0.00153 |
Grade A, and why
codex-mvp-split scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 80 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Codex MVP Split (PlanGate / Codex 共用)
規模 L 以上の機能を着手前に 最小 MVP (Phase 1) に分割する skill。
実行ロジック・質問テンプレ詳細は docs/ai/codex-mvp-split.md を正本とし、
skill は読む順序と入出力規約のみを担う。
Read First
参照解決順（導入先で必ずこの順に探す）
本 skill の参照は上流リポジトリ基準の相対パスで書かれている。導入先ではそのままでは 解決できないものがあるため、次の順で探索する:
- 導入先リポジトリの相対パス（例:
.claude/rules/mode-classification.md）。 ただし 本 skill が参照する節（例:mode-classification.mdの「判定基準」節）が実在することを確認する。同名でも別内容なら PlanGate の正本ではないため 2 へ進む - 無ければ plugin root 配下（例:
<plugin_root>/rules/mode-classification.md）。<plugin_root>は Bash でls "${CLAUDE_PLUGIN_ROOT}/rules/"を実行して展開・確認した 絶対パス（Read ツールは絶対パスを要求し環境変数を展開しないため、${CLAUDE_PLUGIN_ROOT}/...という文字列をそのまま Read しない）。変数が空・未設定ならキャッシュを glob で推測せず 3 へ進む - どちらにも無い場合は 「正本
<path>を参照できなかった」と明示し、推測で内容を補わない
plugin root 配下の探索は docs/** には適用しない（手順 2 は rules/*.md 等の
配布対象にのみ適用する）: plugin が配布するのは agents / commands / skills / rules 等の
定義ディレクトリのみで docs/ を配布対象として認識せず、plugin root 配下に相当する配布物が
存在しないため必ず空振りする。docs/** は手順 1 で解決できなければ手順 2 を飛ばして手順 3 へ進む。
導入経路ごとに配置されるものが違う:
| 参照 | install.sh --claude 経由 |
plugin（Claude marketplace）経由 | Codex 経由 |
|---|---|---|---|
rules/*.md |
.claude/rules/ に着地（解決可） |
<plugin_root>/rules/ で解決 |
未配置（解決不可 → 手順 3 へ） |
docs/** |
コピー対象外（解決不可） | バンドル対象外（解決不可） | 未配置（解決不可） |
install.sh --claude のコピー対象は agents / skills / commands / rules の 4 ディレクトリ
のみ。Codex 経由（install_codex()）は install-plangate-skills.sh を呼ぶだけで skills しか
配置されないため、rules 参照は解決順 1・2 とも成立せず必ず手順 3 に落ちる。
本 skill 固有の注意: 下記 1・2・4 は
docs/**配下＝3 経路とも配布対象外である。 これらが解決できない環境では、本 skill の「Output」「Rules」節（質問構成 4 選択肢 + 工数 S/M/L + 判断材料 3 軸、Phase 分割表の構成）を代替正本とし、Phase 分割表に 「正本<path>を参照できなかった」旨を記録する。
読む順序
docs/ai/codex-mvp-split.md（質問テンプレ・判定基準・実例の正本。配布対象外）docs/ai/plan-metrics-verification.md（#351 / TASK-0117、前段の規模判定。配布対象外）.claude/rules/mode-classification.md→ fallback<plugin_root>/rules/mode-classification.md（5 段階 mode）docs/working/templates/README.md（Phase 分割表 section / pbi-input.md template は未作成、README に記述。配布対象外）
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.
- 4d ago First seen · 80 lines · 87 tokens per session scan A 3d6c5415c732
codex-mvp-split is a skill published in the GitHub repository s977043/PlanGate (2 stars, last pushed 4d ago), licensed MIT. It adds 87 tokens to every session and 1,535 once invoked, about $0.0004 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 2026-08-31.
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