Agent Zero Plugin Development

[!IMPORTANT] Always create new plugins in /a0/usr/plugins/<plugin_name>/. The /a0/plugins/ directory is reserved for core system plugins.

Related skills: /a0/skills/a0-review-plugin/SKILL.md | /a0/skills/a0-contribute-plugin/SKILL.md | /a0/skills/a0-manage-plugin/SKILL.md

Primary references:

• /a0/AGENTS.md (Full-stack architecture & AgentContext)
• /a0/plugins/AGENTS.md (Plugin contract, plugin.yaml, settings, banners, extension contracts, Plugin Index)
• /a0/webui/components/AGENTS.md (Component system and modal component conventions)
• /a0/webui/js/AGENTS.md (Modal stack, API helpers, extension loader)
• /a0/webui/css/AGENTS.md (Modal CSS and shared visual primitives)
• /a0/docs/developer/plugins.md (Developer lifecycle and publishing)

Step 0: Ask First — Local or Community Plugin?