Add agent, command, and skill hooks for direct plugin registration #6811
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Add new extension types to the plugin package: - CommandDefinition: defines slash commands with templates - SkillDefinition: defines skills with name, description, content - AgentDefinition: defines agents with model, mode, prompt, etc. Add helper functions for type-safe extension creation: - command(): creates CommandDefinition - skill(): creates SkillDefinition - agent(): creates AgentDefinition Export new types and helpers from package index.
Modify plugin loading to collect command, skill, and agent definitions from plugins during initialization. Add accessor functions: - Plugin.commands(): returns plugin-provided commands - Plugin.skills(): returns plugin-provided skills - Plugin.agents(): returns plugin-provided agents Include duplicate name warnings for consistency with skill loader. Update trigger function type to exclude new non-function hook properties.
Load plugin-provided commands after built-ins but before config-based commands, establishing precedence: built-in < plugin < config < file. Users can override plugin commands via config or file-based commands.
Load plugin-provided skills first with special 'plugin:' location prefix. File-based skills override plugin skills with the same name.
Load plugin-provided agents after built-ins but before config-based agents. Plugin agents can override built-in agents and be overridden by config-based agents.
Check for 'plugin:' prefix in skill location and fetch content from plugin instead of filesystem. Add error logging when plugin skill content is unavailable.
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While trying to create an inclusive plugin that could contain a related set of items, I kept having to take hackish routes to get skills and commands populated.
This PR seeks to remedy that by adding hooks such that a plugin could be capable of shipping Agent, Command, Skill, and MCP definitions.
I've created and tested against an example plugin https://github.com/ryanrhughes/opencode-plugin-example (keep in mind the devDependency is using a local ref for
@opencode-ai/plugin.Fixes: #6347 & #6013