feat(skills): Add agentic-workflow-guide

Comprehensive guide for designing, reviewing, and improving agent workflows
based on proven design principles (SSOT, SRP, Fail Fast, Iterative Refinement).

Features:
- 15 design principles across 3 tiers (Core, Quality, Scale)
- 5 workflow patterns (Prompt Chaining, Routing, Parallelization,
  Orchestrator-Workers, Evaluator-Optimizer)
- Review checklist and anti-patterns detection
- Scaffold script for generating workflow directory structures

Use cases:
- Designing new agent workflows
- Reviewing/improving existing workflows
- Planning multi-agent architectures
- Scaffolding workflow templates

Author: aktsmm

docs/README.instructions.md

@@ -34,8 +34,8 @@ Team and project-specific instructions to enhance GitHub Copilot's behavior for
 | [Blazor](../instructions/blazor.instructions.md)<br />[![Install in VS Code](https://img.shields.io/badge/VS_Code-Install-0098FF?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fblazor.instructions.md)<br />[![Install in VS Code Insiders](https://img.shields.io/badge/VS_Code_Insiders-Install-24bfa5?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fblazor.instructions.md) | Blazor component and application patterns |
 | [C# Development](../instructions/csharp.instructions.md)<br />[![Install in VS Code](https://img.shields.io/badge/VS_Code-Install-0098FF?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fcsharp.instructions.md)<br />[![Install in VS Code Insiders](https://img.shields.io/badge/VS_Code_Insiders-Install-24bfa5?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fcsharp.instructions.md) | Guidelines for building C# applications |
 | [C# MCP Server Development](../instructions/csharp-mcp-server.instructions.md)<br />[![Install in VS Code](https://img.shields.io/badge/VS_Code-Install-0098FF?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fcsharp-mcp-server.instructions.md)<br />[![Install in VS Code Insiders](https://img.shields.io/badge/VS_Code_Insiders-Install-24bfa5?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fcsharp-mcp-server.instructions.md) | Instructions for building Model Context Protocol (MCP) servers using the C# SDK |
-| [C# 코드 작성 규칙](../instructions/csharp-ko.instructions.md)<br />[![Install in VS Code](https://img.shields.io/badge/VS_Code-Install-0098FF?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fcsharp-ko.instructions.md)<br />[![Install in VS Code Insiders](https://img.shields.io/badge/VS_Code_Insiders-Install-24bfa5?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fcsharp-ko.instructions.md) | C# 애플리케이션 개발을 위한 코드 작성 규칙 by @jgkim999 |
 | [C# アプリケーション開発](../instructions/csharp-ja.instructions.md)<br />[![Install in VS Code](https://img.shields.io/badge/VS_Code-Install-0098FF?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fcsharp-ja.instructions.md)<br />[![Install in VS Code Insiders](https://img.shields.io/badge/VS_Code_Insiders-Install-24bfa5?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fcsharp-ja.instructions.md) | C# アプリケーション構築指針 by @tsubakimoto |
+| [C# 코드 작성 규칙](../instructions/csharp-ko.instructions.md)<br />[![Install in VS Code](https://img.shields.io/badge/VS_Code-Install-0098FF?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fcsharp-ko.instructions.md)<br />[![Install in VS Code Insiders](https://img.shields.io/badge/VS_Code_Insiders-Install-24bfa5?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fcsharp-ko.instructions.md) | C# 애플리케이션 개발을 위한 코드 작성 규칙 by @jgkim999 |
 | [Clojure Development Instructions](../instructions/clojure.instructions.md)<br />[![Install in VS Code](https://img.shields.io/badge/VS_Code-Install-0098FF?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fclojure.instructions.md)<br />[![Install in VS Code Insiders](https://img.shields.io/badge/VS_Code_Insiders-Install-24bfa5?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fclojure.instructions.md) | Clojure-specific coding patterns, inline def usage, code block templates, and namespace handling for Clojure development. |
 | [Cmake Vcpkg](../instructions/cmake-vcpkg.instructions.md)<br />[![Install in VS Code](https://img.shields.io/badge/VS_Code-Install-0098FF?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fcmake-vcpkg.instructions.md)<br />[![Install in VS Code Insiders](https://img.shields.io/badge/VS_Code_Insiders-Install-24bfa5?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fcmake-vcpkg.instructions.md) | C++ project configuration and package management |
 | [Code Components](../instructions/pcf-code-components.instructions.md)<br />[![Install in VS Code](https://img.shields.io/badge/VS_Code-Install-0098FF?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpcf-code-components.instructions.md)<br />[![Install in VS Code Insiders](https://img.shields.io/badge/VS_Code_Insiders-Install-24bfa5?style=flat-square&logo=visualstudiocode&logoColor=white)](https://aka.ms/awesome-copilot/install/instructions?url=vscode-insiders%3Achat-instructions%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Finstructions%2Fpcf-code-components.instructions.md) | Understanding code components structure and implementation |

docs/README.skills.md

@@ -22,4 +22,5 @@ Skills differ from other primitives by supporting bundled assets (scripts, code
 
 | Name | Description | Bundled Assets |
 | ---- | ----------- | -------------- |
+| [agentic-workflow-guide](../skills/agentic-workflow-guide/SKILL.md) | Design, review, and improve agent workflows based on proven design principles (SSOT, SRP, Fail Fast, Iterative Refinement). Supports Prompt Chaining, Parallelization, Orchestrator-Workers, Evaluator-Optimizer patterns. Use when: (1) Designing new agent workflows, (2) Reviewing/improving existing workflows, (3) Planning multi-agent architectures, (4) Detecting anti-patterns, (5) Scaffolding workflow templates/directory structures, (6) Creating agent definitions, prompts, or copilot-instructions | `LICENSE.txt`<br />`references\anti-patterns.md`<br />`references\design-principles.md`<br />`references\review-checklist.md`<br />`references\workflow-patterns.md`<br />`scripts\scaffold_workflow.py` |
 | [webapp-testing](../skills/webapp-testing/SKILL.md) | Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs. | `test-helper.js` |

skills/agentic-workflow-guide/LICENSE.txt

@@ -0,0 +1,35 @@
+MIT License / MIT ライセンス
+
+Copyright (c) 2025 yamapan (aktsmm)
+https://github.com/aktsmm
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+本ソフトウェアおよび関連ドキュメントファイル（以下「ソフトウェア」）のコピーを
+取得するすべての人に対し、無償で以下の許可を与えます：ソフトウェアを無制限に
+使用、コピー、変更、マージ、公開、配布、サブライセンス、販売/または販売する
+こと。ただし、以下の条件に従うものとします：
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+上記の著作権表示および本許諾表示を、ソフトウェアのすべてのコピーまたは
+重要な部分に含めること。
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+本ソフトウェアは「現状有姿」で提供され、商品性、特定目的への適合性、
+権利非侵害を含むがこれに限らない明示的または黙示的な保証は一切ありません。
+作者または著作権者は、契約行為、不法行為、またはその他に起因する
+いかなる請求、損害、その他の責任についても責任を負いません。