c3

C3 - Christophe’s Agentic Collective

[][python] [][uv] [][license]

C3, short for Christophe Agentic Collective, is a personal collective of agents and skills designed for agentic coding and various other purposes. It originated as Christophe’s Coding Crew, which is how the name C3 came to be. Over time, it has undergone significant evolution and has now become known as Christophe’s Agentic Collective. The C3 name has remained consistent throughout its journey. 😉

[!CAUTION] Before installing any plugin: Plugins can execute arbitrary commands on your machine. Always review a plugin's code before installing it.

[!WARNING]
This is my personal collective. It is in constant flux. I try to keep the plugin version stable and usable, but YMMV 😇

Philosophy

My agentic workflow is built on a simple belief: create small automation steps, use them, and iteratively improve. Each skill and agent emerged from real needs, was refined through use, and continues to evolve.

The Skill Evolution Cycle

flowchart LR
    A[Idea] --> B(["/develop-skill"])
    A --> C(["/develop-agent"])
    B --> D[skills/]
    C --> E[agents/]
    D --> F["make local"]
    E --> F
    F --> G[Use in Sessions]
    G --> H(["/lessons-learned"])
    H --> I[Auto-Improve]
    I --> J{Stable?}
    J -->|No| G
    J -->|Yes| K[Push to GitHub]

• Create: Use /develop-skill or /develop-agent to design new skills/agents
• Test locally: make local runs with --plugin-dir ./
• Use/Refine loop: Use in sessions, run /lessons-learned to capture improvements
• Distribute: Push to GitHub when stable

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Installation

As a Plugin (End Users)

Install from the christophe.vg marketplace:

# Add the marketplace
claude plugin marketplace add christophevg/marketplace

# Install C3
claude plugin install c3@christophe.vg

Skills and agents are namespaced (e.g., /c3:python, /c3:commit).

Local Development

To develop or test the latest version locally:

# Clone the repository
git clone https://github.com/christophevg/c3.git
cd c3
make install

[!NOTE]
make install copies Makefile.clause to your personal ~/.claude folder and allows your project Makefiles to include it using -include ~/.claude/Makefile. Now you can use several utility targets to work with claude and use C3 as a harness configuration. For example make basically runs Claude Code using Ollama. If you do this from the C3 folder, it will also include that folder as a plugin.

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Skills (42)

Skills provide focused guidance for specific technologies and workflows.

Plugin & MCP Development (2)

Skill	Description
/mcp-server	Guide for designing and building MCP servers (FastMCP, security, deployment).
/plugin-development	Guide for creating Claude Code plugins (structure, manifest, distribution).

Project Management (6)

Skill	Description
/project	Dispatcher for project management skills.
/project-feature	Capture and scope new features.
/project-manage	Full implementation workflow with specialized agents.
/project-status	Generate STATUS.md with executive summary, metrics, dependencies, blockers, risks.
/project-todo-refine	Iteratively refine TODO.md topics by reviewing state, scope, and priority.
/website-manage	Manage content websites with conversational workflow. No PRs, no agents.

Personal Assistant (4)

Skill	Description
/pa	Main dispatcher for personal assistant workflow.
/pa-inbox	Process inbox files into actionable TODOs.
/pa-session	Manage session state for workflow continuity.
/pa-outbox	Generate formatted replies and manage archive.

Domain Expertise (9)

Skill	Description
/python	Python coding standards and testing patterns.
/pymongo	MongoDB/PyMongo patterns and security.
/baseweb	Baseweb/Vue/Vuetify best practices.
/fire	Python Fire CLI patterns.
/textual	Textual TUI framework.
/rich	Rich console output.
/vuetify-v1	Vuetify 1.5 components in legacy Baseweb projects.
/vuetify-v2	Vuetify V2 components in Baseweb projects.
/vuetify-v3	Vuetify V3 components with comprehensive patterns and migration guide from V2.

Development (2)