feat(coding-agent): add InlineExtension type for named inline extension factories (#6267)

* feat(coding-agent): add InlineExtension type for named inline extension factories

* test(coding-agent): update utilities and add regression test for InlineExtension

packages/coding-agent/src/core/extensions/index.ts

@@ -84,6 +84,7 @@ export type {
 	GetThinkingLevelHandler,
 	GrepToolCallEvent,
 	GrepToolResultEvent,
+	InlineExtension,
 	// Events - Input
 	InputEvent,
 	InputEventResult,

packages/coding-agent/src/core/extensions/types.ts

@@ -1446,6 +1446,14 @@ export interface ProviderModelConfig {
 /** Extension factory function type. Supports both sync and async initialization. */
 export type ExtensionFactory = (pi: ExtensionAPI) => void | Promise<void>;
 
+export type InlineExtension =
+	| ExtensionFactory
+	| {
+			/** Display name shown as `<inline:name>` in the startup Extensions list. */
+			name: string;
+			factory: ExtensionFactory;
+	  };
+
 // ============================================================================
 // Loaded Extension Types
 // ============================================================================

packages/coding-agent/src/core/index.ts

@@ -55,6 +55,7 @@ export {
 	ExtensionRunner,
 	type ExtensionShortcut,
 	type ExtensionUIContext,
+	type InlineExtension,
 	type LoadExtensionsResult,
 	type MessageRenderer,
 	type RegisteredCommand,

packages/coding-agent/src/core/resource-loader.ts

@@ -15,7 +15,7 @@ import {
 	loadExtensionFromFactory,
 	loadExtensionsCached,
 } from "./extensions/loader.ts";
-import type { Extension, ExtensionFactory, ExtensionRuntime, LoadExtensionsResult } from "./extensions/types.ts";
+import type { Extension, ExtensionRuntime, InlineExtension, LoadExtensionsResult } from "./extensions/types.ts";
 import { DefaultPackageManager, type PathMetadata, type ResolvedResource } from "./package-manager.ts";
 import type { PromptTemplate } from "./prompt-templates.ts";
 import { loadPromptTemplates } from "./prompt-templates.ts";
@@ -131,7 +131,7 @@ export interface DefaultResourceLoaderOptions {
 	additionalSkillPaths?: string[];
 	additionalPromptTemplatePaths?: string[];
 	additionalThemePaths?: string[];
-	extensionFactories?: ExtensionFactory[];
+	extensionFactories?: InlineExtension[];
 	noExtensions?: boolean;
 	noSkills?: boolean;
 	noPromptTemplates?: boolean;
@@ -169,7 +169,7 @@ export class DefaultResourceLoader implements ResourceLoader {
 	private additionalSkillPaths: string[];
 	private additionalPromptTemplatePaths: string[];
 	private additionalThemePaths: string[];
-	private extensionFactories: ExtensionFactory[];
+	private extensionFactories: InlineExtension[];
 	private noExtensions: boolean;
 	private noSkills: boolean;
 	private noPromptTemplates: boolean;
@@ -896,8 +896,10 @@ export class DefaultResourceLoader implements ResourceLoader {
 		const extensions: Extension[] = [];
 		const errors: Array<{ path: string; error: string }> = [];
 
-		for (const [index, factory] of this.extensionFactories.entries()) {
-			const extensionPath = `<inline:${index + 1}>`;
+		for (const [index, input] of this.extensionFactories.entries()) {
+			const isNamed = typeof input !== "function";
+			const factory = isNamed ? input.factory : input;
+			const extensionPath = `<inline:${isNamed ? input.name : index + 1}>`;
 			try {
 				const extension = await loadExtensionFromFactory(factory, this.cwd, this.eventBus, runtime, extensionPath);
 				extensions.push(extension);

packages/coding-agent/src/core/sdk.ts

@@ -100,6 +100,7 @@ export type {
 	ExtensionCommandContext,
 	ExtensionContext,
 	ExtensionFactory,
+	InlineExtension,
 	SlashCommandInfo,
 	SlashCommandSource,
 	ToolDefinition,