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Stay current with how OpenCode, OpenAI Codex, and Claude Code implement extensibility features (skills, slash commands, subagents, custom prompts). Use when comparing implementations across AI coding assistants, researching how a specific tool implements a feature, or syncing knowledge about agent extensibility patterns. Triggers include questions like "how does X implement skills?", "compare slash commands across tools", "what's the latest on Claude Code sub-agents?", or requests to understand agent extensibility approaches.
npx skill4agent add kasperjunge/agent-resources-legacy coding-agent-docsreferences/documentation-urls.md| Concept | OpenCode | Codex | Claude Code |
|---|---|---|---|
| Reusable workflows | Skills | Skills, Custom Prompts | Skills |
| User commands | Commands | - | Slash Commands |
| Autonomous tasks | Agents | - | Sub-agents |