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custom-charm

Automate Juju charm construction for custom applications with Pebble or machine substrates.

1|Updated Feb 8, 2026
Search Tags:#scaffolding#kubernetes#juju#machine#ops-framework#charms#custom-charm
One-click install
npx skills add https://github.com/tonyandrewmeyer/cantrip --skill custom-charm
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: custom-charm
Source: https://github.com/tonyandrewmeyer/cantrip/tree/main/src/cantrip/skills/custom-charm
Command: npx skills add https://github.com/tonyandrewmeyer/cantrip --skill custom-charm

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

End-to-end workflow for building Juju charms for custom applications that do not fit standard frameworks, enabling developers to manage workload lifecycles with Pebble on Kubernetes or systemd/apt on machines.

Core Features & Use Cases

  • Auto-guided substrate decision and scaffolding
  • End-to-end charm generation including charmcraft.yaml, src/charm.py, and basic workflows
  • Examples for Kubernetes Pebble and machine services
  • Quick-start guidance for rapid prototyping using the custom-charm path

Quick Start

Describe your application and let Cantrip scaffold a custom Ops charm model ready for charmcraft packaging.

Frequently Asked Questions about custom-charm

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I build a Juju charm for a custom application that doesn't fit standard PaaS frameworks?▼

Build a custom Juju charm by automating substrate selection, scaffolding with charmcraft, and customizing charm.yaml. This workflow generates end-to-end ops-framework charms for Kubernetes Pebble and machine services.

When should I use Kubernetes Pebble versus machine substrates for my custom charm?▼

Use Kubernetes Pebble for container workload lifecycle management and machine substrates for systemd or apt services. The custom charm workflow auto-guides substrate decisions based on your specific application requirements.

What is the best way to scaffold an ops-framework charm from scratch?▼

Scaffold an ops-framework charm by describing your application to trigger automated generation of charmcraft.yaml, src/charm.py, and basic workflows. This provides step-by-step guidance for rapid prototyping.

Can I use charmcraft to generate both Kubernetes and machine charms for custom apps?▼

Yes, charmcraft scaffolds custom charms for both Kubernetes Pebble-based and machine services. The workflow includes analysis, scaffolding, config customization, and written sample code with patterns.

What files and configurations are generated when scaffolding a custom Juju charm?▼

Scaffolding a custom Juju charm generates charmcraft.yaml, src/charm.py, and basic workflows. It also provides customization of charm.yaml along with written sample code, patterns, and examples.

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