workflow: Claude Code Plugin Marketplace and Harmonius Game Engine Development Workflow

workflow is a plugin marketplace designed specifically for Claude Code, created by developer cjhowe-us. The core plugins rumdl and harmonize support the development of the Harmonius game engine, providing Markdown formatting, code standards, and full lifecycle management capabilities from design to implementation to release. It deeply integrates the Skill and Agent systems of AI assistants, also supports the Cursor editor, and uses the Apache-2.0 open-source license.

The workflow project introduces the concept of traditional code editor plugins into the AI programming assistant domain. Unlike simple command extensions, it deeply integrates Claude Code's Skill system and Agent capabilities, transforming the AI assistant from a conversational tool into a development collaboration partner. Its aim is to build a complete development toolchain for the Harmonius game engine.

rumdl is a foundational plugin responsible for document quality: 1. Markdown LSP support: real-time syntax checking, structural analysis, and intelligent completion; 2. PostToolUse formatting hook: automatically formats documents after AI completes tool calls; 3. Markdown coding standards Skill: predefined unified rules for title hierarchy, list formats, etc.

harmonize is the flagship plugin, covering four stages: ideate-design-implement-release: Ideation (brainstorming, requirement analysis), Design (technical document generation), Implementation (code templates and standard checks), Release (testing, packaging, and document generation). It has built-in Skills and a template library, as well as a supervisor Agent that monitors project status and coordinates phase transitions.

Dependency relationship: harmonize depends on rumdl; Installation commands: first add the marketplace (claude plugin marketplace add cjhowe-us/workflow), then install rumdl (claude plugin install rumdl@cjhowe-us-workflow), then install harmonize (claude plugin install harmonize@cjhowe-us-workflow); Note the order when updating or uninstalling; rumdl requires binary files in the system PATH and a .toml file to configure custom rules.

Supports the Cursor editor; maps playbooks to the Task system via configuration files; uses the Apache-2.0 license, allowing commercial use, modification, and distribution, making it suitable for commercial game engine projects.

The project demonstrates the evolutionary direction of the AI programming assistant ecosystem: layered architecture (rumdl as the foundational layer, harmonize as the application layer), lifecycle management perspective, balance between human-machine collaboration (Agent and automated hooks), cross-platform compatibility (respecting developers' choices).

workflow is a reference implementation for AI-assisted development, exploring a new development paradigm (AI deeply participates in the lifecycle); provides validated workflow templates for teams working on complex systems (such as game engines), allowing developers to focus on creative work while leaving repetitive tasks to AI.