MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
River Review のメインエントリポイント. An agent skill from hashgraph-online/awesome-codex-plugins.
$ npx skills add hashgraph-online/awesome-codex-plugins --skill river-review -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins river-review --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/s977043/river-review/skills/agent-skills/river-review .claude/skills/river-review && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "river-review" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/s977043/river-review/skills/agent-skills/river-review into .claude/skills/river-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "river-review", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/s977043/river-review/skills/agent-skills/river-reviewType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add hashgraph-online/awesome-codex-plugins --skill river-review -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins river-review --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/s977043/river-review/skills/agent-skills/river-review .agents/skills/river-review && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "river-review" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/s977043/river-review/skills/agent-skills/river-review into .agents/skills/river-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "river-review", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add hashgraph-online/awesome-codex-plugins --skill river-review -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins river-review --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/s977043/river-review/skills/agent-skills/river-review .cursor/skills/river-review && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "river-review" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/s977043/river-review/skills/agent-skills/river-review into .cursor/skills/river-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "river-review", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/hashgraph-online/awesome-codex-plugins.git --path plugins/s977043/river-review/skills/agent-skills/river-review--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add hashgraph-online/awesome-codex-plugins --skill river-review -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins river-review --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/s977043/river-review/skills/agent-skills/river-review .gemini/skills/river-review && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "river-review" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/s977043/river-review/skills/agent-skills/river-review into .gemini/skills/river-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "river-review", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install hashgraph-online/awesome-codex-plugins river-reviewInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add hashgraph-online/awesome-codex-plugins --skill river-review -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/s977043/river-review/skills/agent-skills/river-review .github/skills/river-review && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "river-review" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/s977043/river-review/skills/agent-skills/river-review into .github/skills/river-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "river-review", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add hashgraph-online/awesome-codex-plugins --skill river-review -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install hashgraph-online/awesome-codex-plugins river-review --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/s977043/river-review/skills/agent-skills/river-review .opencode/skills/river-review && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "river-review" agent skill from https://github.com/hashgraph-online/awesome-codex-plugins/tree/main/plugins/s977043/river-review/skills/agent-skills/river-review into .opencode/skills/river-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "river-review", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
river-reviewRiver Review のメインエントリポイント. An agent skill from hashgraph-online/awesome-codex-plugins.
River Review is an agent skill from hashgraph-online/awesome-codex-plugins. River Review のメインエントリポイント。 レビュー依頼の intent classification → 専門 skill 選択 → 実行 → finding verification → feedback classification → fixture / reference / suppression への還元までを束ねる improvement-loop orchestrator。
Its SKILL.md is about 2.6k tokens, which your agent loads only when the skill is triggered. The skill folder holds 12 other files, including reference files (for example `fixtures/01-intent-comment-resolves-finding.md`, `fixtures/02-intent-comment-downgrade-with-rebuttal.md` and `fixtures/03-comment-contradicts-implementation.md`).
It sits in Agent Workflows. The repository describes itself as: A curated list of awesome OpenAI Codex / ChatGPT plugins, skills, and resources. The 1 Codex Marketplace. See live plugins at: https://hol.org/plugins/best-codex-plugins. The licence is MIT.
6 steps, taken from the first numbered list in SKILL.md.
Read from SKILL.md and the folder at commit 3e1456a. It shows what the files ask for, not the result of running them.
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).
From the folder's file list and the shell code blocks in SKILL.md.
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
River Review loads about 2.6k tokens when it runs, and up to ~13k if it reads all its reference files. Until then it costs about 54 tokens; SKILL.md has 547 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
The full file from hashgraph-online/awesome-codex-plugins at commit 3e1456a, republished under its MIT licence (© hashgraph-online). 547 words, ~2,583 tokens.
.claude/skills/river-review/SKILL.md (or your agent's skills folder). This skill also uses 10 other files; get the full folder from GitHub.River Review は「流れに寄り添う」AI レビューエージェントです。 単にレビューを実行するだけでなく、レビュー結果を検証し、フィードバックを分類して fixture / reference / suppression / routing へ還元する継続改善ループ を担います。
このエントリ skill は以下を担う。順序は実行フローと一致する。
AGENTS.md などの作業規則は、レビュー作業の進め方に適用する。.river/rules.md はレビュー基準として扱い、明示されたユーザーの観点を狭めない。未検証 として区別し、finding の根拠に使わない。review 実行プランを組むときに参照する入力は、以下の優先順で扱う。 上位の入力が下位を上書きする。
plan / diff / test-cases / junit / coverage / review-self / review-external.river/rules.md — リポジトリ固有のレビュー規則.river/risk-map.yaml — リスクマップ.river/ 系が見つからない場合は .claude/rules/ を fallback として使う。
入力に応じて、以下の専門スキルへ案内します。詳細な優先度規則は ROUTING.md。
| キーワード | 専門スキル | 説明 |
|---|---|---|
| 設計, アーキテクチャ, ADR | river-review-architecture | 設計・アーキテクチャレビュー |
| セキュリティ, 脆弱性 | river-review-security | セキュリティ観点レビュー |
| パフォーマンス, 最適化 | river-review-performance | パフォーマンス観点レビュー |
| テスト, カバレッジ | river-review-testing | テスト観点レビュー |
| UI, フロントエンド, アクセシビリティ, a11y, デザインシステム, コンポーネント | river-review-frontend | フロントエンド観点レビュー |
| 敵対的, 壁打ち, バイアス | adversarial-review | 敵対的レビュー(3手法統合) |
| ドキュメント, README, i18n | river-review-docs | ドキュメント整合性レビュー |
| (上記以外) | river-review-code | 一般コード品質レビュー |
デフォルト動作: キーワードがどれにも当てはまらない場合は一般コードレビュー (river-review-code) にフォールバックします。
複数カテゴリ該当時: severity重み → キーワード数 → 入力内位置の順で優先度を解決します。同点時は併用実行します。
1. 入力の intent classification
├─ 明示的なキーワード指定あり → 該当する専門スキルへルーティング
├─ 複数カテゴリに該当 → severity重み → キーワード数 → 入力内位置で優先度解決
└─ キーワードなし → river-review-code(デフォルト)へフォールバック
2. 専門スキルの実行
├─ river-review-architecture: 設計・アーキテクチャ観点
├─ river-review-security: セキュリティ観点
├─ river-review-performance: パフォーマンス観点
├─ river-review-testing: テスト観点
├─ river-review-frontend: フロントエンド観点
├─ adversarial-review: 敵対的レビュー(3手法統合)
├─ river-review-docs: ドキュメント整合性観点
└─ river-review-code: 一般コード品質(フォールバック)
3. Finding verification
└─ VERIFICATION.md の 8 項目 self-check を全件通過したものだけ出力
4. Unknown Coverage 合成(finding verification 後のメタ観点)
└─ 検証済み finding + artifact を横断し、unknown-coverage-review へ委譲して残存 Unknown / 証拠不足を合成(report-only・マージは止めない・plan 欠損時は skippedSkills でデグレード)
5. Feedback classification(人間/エージェント返答受領後)
└─ FEEDBACK.md の 7 type で分類
6. Improvement loop handoff
└─ IMPROVEMENT_LOOP.md の 9 ステップに従って fixture / reference / suppression / routing を更新Finding は以下のフィールドを満たすこと。詳細条件は VERIFICATION.md。
| フィールド | 内容 |
|---|---|
| Finding | 何が問題か(1 文) |
| Evidence | file:line か artifact 参照。差分外の推測は不可 |
| Impact | 何が壊れる / 誰が困るか(具体的に) |
| Fix | 次の最小一手。1 ファイル / 1 関数 / 1 設定値の粒度を起点に |
| Confidence | high / medium / low / unknown |
| Severity | critical / major / minor / info(出力スキーマでは critical→major→minor→info に正規化) |
| Skill ID | どの専門 skill が出した finding か(routing 透明化) |
シンプルな出力フォーマット:
<file>:<line>: <Finding>
Impact: <Impact>
Fix: <Fix>
Severity: <severity> / Confidence: <confidence> / Skill: <skill-id>以下 8 つの入口名は Flow Entry であり、専門 skill ではない。 入口名から Flow id を引くだけの薄い配線であり、判断ロジックはここに持たせない。
| 入口名 | Flow id | 問い | 起動 trigger |
|---|---|---|---|
review-plan | plan-review | この計画で安全に実行を開始できるか | artifact-ready |
review-replan | replan-review | 計画変更は合理的で、上流の契約を壊していないか | artifact-ready |
review-task | task-completion-review | この Task を DONE と宣言できる Evidence があるか | task-checkpoint |
review-final | final-review | 全 Task の終了ではなく、Goal / Requirement を満たしたか | before-publish / before-merge |
review-research | research-review | この調査結果を要件・設計・計画の根拠として使ってよいか | artifact-ready |
review-requirements | requirements-review | この要件から設計・実装へ進んでよいか | artifact-ready |
review-design | design-review | この設計から実装へ進んでよいか | artifact-ready |
review-technical | technical-review | 宣言された技術的前提は Evidence 上成立するか | artifact-ready |
flows/entry-map.json であり、上表はその写しにあたるflows/entry-map.json の triggers である(#2054 PR-1)。trigger は host 名を持たない中立の工程イベント名であり、after-change は入口を起動しない(entries: [])ため上表に行を持たないflows/*.flow.json、Review Intent は flows/intents/*.intent.json を読むevidence[].onMissing に従うinputs[].required と step の onUnsatisfied にも現れる。両者の一致はテストが検査するstage はレビューの局面、phase は skill 選択の段階であり別軸とする。上流 4 本は stage が 4 種類で phase は upstream に揃うselectSkills が決める。Flow は skill を名指ししない詳細はリポジトリ本体の docs/development/flow-contract.md(#2016)と docs/development/upstream-review-flows.md(#2017)にある。
どちらもこの skill の配布パッケージには同梱されないため、リンクではなくパス名で示す。
agents/river-review.md)Claude Code プラグインとしてインストールされている場合、river-review エージェントがこのスキルを読み込んで実行する。
エージェントは薄いラッパーであり、すべての手順・ルーティング・検証ロジックはこのスキルが SSoT となる。
利用可能なツール: Read, Grep, Glob, Bash
スキルのパス解決:
# Claude Code plugin 環境
${CLAUDE_PLUGIN_ROOT}/skills/agent-skills/river-review/SKILL.md
# リポジトリ内で直接実行する場合(フォールバック)
./skills/agent-skills/river-review/SKILL.mdCodex では skills/agent-skills/ 配下のスキルとして直接利用できる。
このスキルを読み込み、手順に従ってレビューを実行する。
river CLI が PATH 上にある場合、構造化 finding のブートストラップに使える:
river run . --reviewers auto --output jsonJSON には findings / autoSelectedRoles / score が含まれる。
CLI は必須でない。absent または失敗した場合はスキル駆動のレビューで継続すること。
© hashgraph-online, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
SKILL.md and 10 other files (references) in plugins/s977043/river-review/skills/agent-skills/river-review of hashgraph-online/awesome-codex-plugins.
Open the folder on GitHubat commit 3e1456a
River Review next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| River Review this skillhashgraph-online/awesome-codex-plugins | 1.3k | — | ~2.6k | Automated safety check: Pass | MIT | |
| MCP Server Builderanthropics/skills | 180k | 63 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| Hook Development for Claude Code Pluginsanthropics/claude-plugins-official | 38k | 10 repos | ~4.1k | Automated safety check: Notes | Apache-2.0 | |
| Using Superpowersfarm-fe/farm | 5.6k | 35 repos | ~1.4k | Automated safety check: Pass | MIT | |
| Executing Plans Inlineobra/superpowers | 297k | 2 repos | ~5.1k | Automated safety check: Pass | MIT | |
| Skill CreatorAzure/azqr | 796 | 89 repos | ~8.2k | Automated safety check: Pass | Apache-2.0 |
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
anthropics/claude-plugins-official
Explains how to write Claude Code plugin hooks, both prompt-based checks and bash commands, for events such as PreToolUse, Stop and SessionStart.
farm-fe/farm
A skill your agent uses when starting any conversation - establishes how to find and use skills, requiring Skill tool invocation before ANY response including clarifying questions
obra/superpowers
Has the agent carry out an implementation plan itself, task by task in the current session, keeping a ledger, proving each step with a test and ending with one whole-branch review.
Azure/azqr
Create new skills, modify and improve existing skills, and measure skill performance.
anthropics/claude-plugins-official
Explains how to write agents for Claude Code plugins: the markdown file with YAML frontmatter, trigger descriptions, model and color settings, and system prompt design.
hashgraph-online/awesome-codex-plugins
Create original anime-style reaction stickers as looping GIFs and MP4 previews, using generated character pose sheets and timed key poses.
hashgraph-online/awesome-codex-plugins
Manage and query Calibre libraries with the calibredb CLI (local paths or Calibre Content server URLs).
hashgraph-online/awesome-codex-plugins
A skill your agent uses when adding, changing, testing, or debugging Rust HTTP APIs and services, especially when Codex needs black-box integration tests, random-port app startup, real database test…
hashgraph-online/awesome-codex-plugins
Make a studio's game look like something at build time — a cover from a real frame of the game (free), painted covers, backdrops, textures and character plates from image models through the…
hashgraph-online/awesome-codex-plugins
Use CALL-E from Codex through the calle CLI. An agent skill from hashgraph-online/awesome-codex-plugins.
hashgraph-online/awesome-codex-plugins
Balance game difficulty, resources, rewards, probability, progression, economies, and dominant strategies.
Categories
River Review のメインエントリポイント. An agent skill from hashgraph-online/awesome-codex-plugins. River Review is an agent skill from hashgraph-online/awesome-codex-plugins.
River Review fits situations like: agent Workflows work in your project.
Run `npx skills add hashgraph-online/awesome-codex-plugins --skill river-review -a claude-code`. Or copy the skill folder (plugins/s977043/river-review/skills/agent-skills/river-review in hashgraph-online/awesome-codex-plugins) into .claude/skills/river-review in your project. Claude Code loads it when a task matches its description.
Run `npx skills add hashgraph-online/awesome-codex-plugins --skill river-review -a codex`. Or copy the skill folder (plugins/s977043/river-review/skills/agent-skills/river-review in hashgraph-online/awesome-codex-plugins) into .agents/skills/river-review in your project. Codex loads it when a task matches its description.
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add hashgraph-online/awesome-codex-plugins --skill river-review -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/river-review, .gemini/skills/river-review, .github/skills/river-review and .opencode/skills/river-review in your project.
SKILL.md names no scripts, command-line tools or credentials: River Review is instructions for the agent only.
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
River Review is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
About 2.6k tokens (SKILL.md is roughly 10k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 9.9k tokens, read only when the agent opens those files.
Skills that share tags, products or a category with River Review: MCP Server Builder (anthropics/skills, 180k stars), Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Using Superpowers (farm-fe/farm, 5.6k stars) and Executing Plans Inline (obra/superpowers, 297k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
hashgraph-online (a GitHub organization) maintains it in hashgraph-online/awesome-codex-plugins, which has 1,267 GitHub stars. The repository holds 716 skills in this directory. The repository was last updated on October 10, 2026.
Source: hashgraph-online/awesome-codex-plugins on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.