fix(coding-agent): add entry renderers for session entries

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

@@ -50,6 +50,9 @@ export type {
 	EditorFactory,
 	EditToolCallEvent,
 	EditToolResultEvent,
+	// Message and Entry Rendering
+	EntryRenderer,
+	EntryRenderOptions,
 	ExecOptions,
 	ExecResult,
 	Extension,
@@ -91,7 +94,6 @@ export type {
 	LsToolResultEvent,
 	// Events - Message
 	MessageEndEvent,
-	// Message Rendering
 	MessageRenderer,
 	MessageRenderOptions,
 	MessageStartEvent,

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

@@ -30,6 +30,7 @@ import { execCommand } from "../exec.ts";
 import { createSyntheticSourceInfo } from "../source-info.ts";
 import { time } from "../timings.ts";
 import type {
+	EntryRenderer,
 	Extension,
 	ExtensionAPI,
 	ExtensionFactory,
@@ -269,6 +270,12 @@ function createExtensionAPI(
 			extension.messageRenderers.set(customType, renderer as MessageRenderer);
 		},
 
+		registerEntryRenderer<T>(customType: string, renderer: EntryRenderer<T>): void {
+			runtime.assertActive();
+			extension.entryRenderers ??= new Map();
+			extension.entryRenderers.set(customType, renderer as EntryRenderer);
+		},
+
 		// Flag access - checks extension registered it, reads from runtime
 		getFlag(name: string): boolean | string | undefined {
 			runtime.assertActive();
@@ -415,6 +422,7 @@ function createExtension(extensionPath: string, resolvedPath: string): Extension
 		handlers: new Map(),
 		tools: new Map(),
 		messageRenderers: new Map(),
+		entryRenderers: new Map(),
 		commands: new Map(),
 		flags: new Map(),
 		shortcuts: new Map(),

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

@@ -19,6 +19,7 @@ import type {
 	ContextEvent,
 	ContextEventResult,
 	ContextUsage,
+	EntryRenderer,
 	Extension,
 	ExtensionActions,
 	ExtensionCommandContext,
@@ -553,6 +554,16 @@ export class ExtensionRunner {
 		return undefined;
 	}
 
+	getEntryRenderer(customType: string): EntryRenderer | undefined {
+		for (const ext of this.extensions) {
+			const renderer = ext.entryRenderers?.get(customType);
+			if (renderer) {
+				return renderer;
+			}
+		}
+		return undefined;
+	}
+
 	private resolveRegisteredCommands(): ResolvedCommand[] {
 		const commands: RegisteredCommand[] = [];
 		const counts = new Map<string, number>();

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

@@ -52,6 +52,7 @@ import type { ModelRegistry } from "../model-registry.ts";
 import type {
 	BranchSummaryEntry,
 	CompactionEntry,
+	CustomEntry,
 	ReadonlySessionManager,
 	SessionEntry,
 	SessionManager,
@@ -1093,19 +1094,29 @@ export interface SessionBeforeTreeResult {
 }
 
 // ============================================================================
-// Message Rendering
+// Message and Entry Rendering
 // ============================================================================
 
 export interface MessageRenderOptions {
 	expanded: boolean;
 }
 
+export interface EntryRenderOptions {
+	expanded: boolean;
+}
+
 export type MessageRenderer<T = unknown> = (
 	message: CustomMessage<T>,
 	options: MessageRenderOptions,
 	theme: Theme,
 ) => Component | undefined;
 
+export type EntryRenderer<T = unknown> = (
+	entry: CustomEntry<T>,
+	options: EntryRenderOptions,
+	theme: Theme,
+) => Component | undefined;
+
 // ============================================================================
 // Command Registration
 // ============================================================================
@@ -1224,6 +1235,9 @@ export interface ExtensionAPI {
 	/** Register a custom renderer for CustomMessageEntry. */
 	registerMessageRenderer<T = unknown>(customType: string, renderer: MessageRenderer<T>): void;
 
+	/** Register a custom renderer for CustomEntry. Custom entries do not participate in LLM context. */
+	registerEntryRenderer<T = unknown>(customType: string, renderer: EntryRenderer<T>): void;
+
 	// =========================================================================
 	// Actions
 	// =========================================================================
@@ -1598,6 +1612,7 @@ export interface Extension {
 	handlers: Map<string, HandlerFn[]>;
 	tools: Map<string, RegisteredTool>;
 	messageRenderers: Map<string, MessageRenderer>;
+	entryRenderers?: Map<string, EntryRenderer>;
 	commands: Map<string, RegisteredCommand>;
 	flags: Map<string, ExtensionFlag>;
 	shortcuts: Map<KeyId, ExtensionShortcut>;