Agent tools in donmai are extended through plugins. A plugin is a TypeScript package that implements the ToolPlugin interface and returns typed MCP tool definitions via createTools().

• Overview — what a plugin is, the @donmai/plugin-linear canonical example, and the full list of af_linear_* and af_code_* tools.
• Authoring — the ToolPlugin and ToolPluginContext interfaces, a worked example, and publishing under @donmai/*.