Add skill for multi-provider plugin architecture (Claude Code + Codex + OpenCode)

[gwpl]

AI Assistant:

Summary

Would it be valuable to add a skill that documents how to make Claude Code plugins compatible with other AI coding assistants (Codex, OpenCode, etc.)?

Motivation

The obra/superpowers repository demonstrates excellent patterns for multi-provider support:

• Shared /skills/ directory used by all providers
• Provider-specific adapters (.claude-plugin/, .codex/, .opencode/)
• Tool mapping (Skill → custom CLI, TodoWrite → update_plan, etc.)
• Bootstrap injection at session start
• Skill shadowing (project > personal > plugin)

These patterns could help plugin authors who want broader reach beyond Claude Code.

Proposed Skill: multi-provider-plugins

A new skill covering:

• Architecture overview - Adapter pattern, directory structure
• Provider adapters - How to create integrations for Claude Code, Codex, OpenCode
• Tool mapping reference - Translating Claude Code tools to provider equivalents
• Bootstrap patterns - Session-start injection implementations
• Shared skills library - Structuring portable skills

References

• Pattern source: obra/superpowers
• Providers documented: Claude Code, OpenAI Codex, OpenCode

Implementation

PR with the implementation: #10