How do I install the Skill Class Model En skill?

Run npx skillmds@latest add roebi/skill-class-model-en in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Skill Class Model En free to use?

Yes. Installing skills from SkillMD is free. This skill is licensed under CC BY-NC-SA 4.

Who published Skill Class Model En?

roebi (@roebi) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Skill Class Model En by roebi — Agent Skill

Name: Skill Class Model En
Author: roebi

Skill Class Model En

Documents the Skill Class Model — the OO-based taxonomy that classifies every Agent Skill as one of: Role, Topic, Process, or OneStepProcess, each extending the base Skill class. Defines the v1 metadata extension fields for skill-class, crud-verb, topic, requires-role, subprocess-of, subtopic-of, and subrole-of. Use when an agent or author needs to classify a skill, assign metadata, understand the class hierarchy, or check naming conventions. Activate for phrases like: "what class is this skill", "how do I classify a skill", "skill taxonomy", "skill-class metadata", "is-a or has-a for skills", "what metadata does a Role need", or "naming convention for process skills".

roebi 67e7d98 3 files · 8.7 KB Updated Sep 17, 2026

File contents

Skill Class Model

The Skill Class Model applies object-oriented design to Agent Skills. Every skill is an instance of a class that extends the base Skill class. Classes are discriminated by the metadata.skill-class field (v1 extension).

Class Hierarchy (is-a / inheritance)

Skill                          ← base class (agentskills.io)
├── Role                       ← extends Skill
├── Topic                      ← extends Skill
└── Process                    ← extends Skill
    └── OneStepProcess         ← extends Process

Composition (has-a)

Topic          has  Subtopic        1:n
Topic          has  File            1:n

Role           has  Subrole         1:n

Process        needs  Role          1:n   (mandatory)
Process        has    Subprocess    1:n

OneStepProcess needs  Role          0..1  (optional)

Key rule: Process is higher than Role. A Process needs one or more Roles — never the other way around.

The Subject and the Verb

A Topic is the subject — the thing that gets operated on. A OneStepProcess applies a CRUD verb to a Topic.

crud	natural language equivalents
create	create, generate, scaffold, write, init
read	read, search, find, list, get, describe, show
update	update, fix, move, rename, migrate, refactor
delete	delete, remove, clean, prune

Naming Conventions

Class	Pattern	Example
Role	`role-<name>-en`	`role-sw-architect-en`
Topic	`<topic>-en` or `<compound-topic>-en`	`agentic-runtime-architecture-en`
Process	`<name>-en`	`onboarding-employee-en`
OneStepProcess	`<crud-verb>-<topic>-en`	`create-agent-skill-en`

Metadata Fields — v1

See references/metadata-v1.md for the full field reference.

Quick summary:

# All classes — discriminator (required for classified skills)
metadata:
  skill-class: role | topic | process | one-step-process

# Role adds:
  subrole-of: <role-name>           # optional

# Topic adds:
  subtopic-of: <topic-name>         # optional
  requires-role: <role-name>        # optional

# Process adds:
  requires-role: <role-name>        # 1:n comma-separated (mandatory)
  subprocess-of: <process-name>     # optional

# OneStepProcess adds:
  crud-verb: create | read | update | delete   # mandatory
  topic: <topic-name>                          # mandatory
  subprocess-of: <process-name>               # optional
  requires-role: <role-name>                  # optional 0..1

Composability Chain

When an agent loads a skill it resolves the role chain automatically:

load skill
  → read requires-role
    → load role-<name>-en
      → agent has role context + task context
        → execute

References

references/metadata-v1.md — full field-by-field metadata reference
references/examples.md — concrete skills mapped to each class

---name: skill-class-model-endescription: Documents the Skill Class Model — the OO-based taxonomy that classifies every Agent Skill as one of: Role, Topic, Process, or OneStepProcess, each extending the base Skill class. Defines the v1 metadata extension fields for skill-class, crud-verb, topic, requires-role, subprocess-of, subtopic-of, and subrole-of. Use when an agent or author needs to classify a skill, assign metadata, understand the class hierarchy, or check naming conventions. Activate for phrases like: "what class is this skill", "how do I classify a skill", "skill taxonomy", "skill-class metadata", "is-a or has-a for skills", "what metadata does a Role need", or "naming convention for process skills".license: CC BY-NC-SA 4.0---# Skill Class ModelThe Skill Class Model applies object-oriented design to Agent Skills.Every skill is an instance of a class that extends the base `Skill` class.Classes are discriminated by the `metadata.skill-class` field (v1 extension).## Class Hierarchy (is-a / inheritance)```Skill ← base class (agentskills.io)├── Role ← extends Skill├── Topic ← extends Skill└── Process ← extends Skill └── OneStepProcess ← extends Process```## Composition (has-a)```Topic has Subtopic 1:nTopic has File 1:nRole has Subrole 1:nProcess needs Role 1:n (mandatory)Process has Subprocess 1:nOneStepProcess needs Role 0..1 (optional)```**Key rule:** Process is higher than Role. A Process needs one or more Roles —never the other way around.## The Subject and the VerbA `Topic` is the **subject** — the thing that gets operated on.A `OneStepProcess` applies a **CRUD verb** to a Topic.| crud | natural language equivalents ||------|------------------------------|| create | create, generate, scaffold, write, init || read | read, search, find, list, get, describe, show || update | update, fix, move, rename, migrate, refactor || delete | delete, remove, clean, prune |## Naming Conventions| Class | Pattern | Example ||---|---|---|| Role | `role-<name>-en` | `role-sw-architect-en` || Topic | `<topic>-en` or `<compound-topic>-en` | `agentic-runtime-architecture-en` || Process | `<name>-en` | `onboarding-employee-en` || OneStepProcess | `<crud-verb>-<topic>-en` | `create-agent-skill-en` |## Metadata Fields — v1See `references/metadata-v1.md` for the full field reference.Quick summary:```yaml# All classes — discriminator (required for classified skills)metadata: skill-class: role | topic | process | one-step-process# Role adds: subrole-of: <role-name> # optional# Topic adds: subtopic-of: <topic-name> # optional requires-role: <role-name> # optional# Process adds: requires-role: <role-name> # 1:n comma-separated (mandatory) subprocess-of: <process-name> # optional# OneStepProcess adds: crud-verb: create | read | update | delete # mandatory topic: <topic-name> # mandatory subprocess-of: <process-name> # optional requires-role: <role-name> # optional 0..1```## Composability ChainWhen an agent loads a skill it resolves the role chain automatically:```load skill → read requires-role → load role-<name>-en → agent has role context + task context → execute```## References- `references/metadata-v1.md` — full field-by-field metadata reference- `references/examples.md` — concrete skills mapped to each class

Frequently asked questions