fix(plugins): restore memory prompt builder on cached plugin loads

src/memory/prompt-section.ts

@@ -23,6 +23,16 @@ export function buildMemoryPromptSection(params: {
   return _builder?.(params) ?? [];
 }
 
+/** Return the current builder (used by the plugin cache to snapshot state). */
+export function getMemoryPromptSectionBuilder(): MemoryPromptSectionBuilder | undefined {
+  return _builder;
+}
+
+/** Restore a previously-snapshotted builder (used on plugin cache hits). */
+export function restoreMemoryPromptSection(builder: MemoryPromptSectionBuilder | undefined): void {
+  _builder = builder;
+}
+
 /** Clear the registered builder (called on plugin reload and in tests). */
 export function clearMemoryPromptSection(): void {
   _builder = undefined;

src/plugins/loader.ts

@@ -9,8 +9,12 @@ import type { PluginInstallRecord } from "../config/types.plugins.js";
 import type { GatewayRequestHandler } from "../gateway/server-methods/types.js";
 import { openBoundaryFileSync } from "../infra/boundary-file-read.js";
 import { createSubsystemLogger } from "../logging/subsystem.js";
+import {
+  clearMemoryPromptSection,
+  getMemoryPromptSectionBuilder,
+  restoreMemoryPromptSection,
+} from "../memory/prompt-section.js";
 import { resolveUserPath } from "../utils.js";
-import { clearMemoryPromptSection } from "../memory/prompt-section.js";
 import { inspectBundleMcpRuntimeSupport } from "./bundle-mcp.js";
 import { clearPluginCommands } from "./commands.js";
 import {
@@ -91,8 +95,13 @@ export class PluginLoadFailureError extends Error {
   }
 }
 
+type CachedPluginState = {
+  registry: PluginRegistry;
+  memoryPromptBuilder: ReturnType<typeof getMemoryPromptSectionBuilder>;
+};
+
 const MAX_PLUGIN_REGISTRY_CACHE_ENTRIES = 128;
-const registryCache = new Map<string, PluginRegistry>();
+const registryCache = new Map<string, CachedPluginState>();
 const openAllowlistWarningCache = new Set<string>();
 const LAZY_RUNTIME_REFLECTION_KEYS = [
   "version",
@@ -180,7 +189,7 @@ export const __testing = {
   maxPluginRegistryCacheEntries: MAX_PLUGIN_REGISTRY_CACHE_ENTRIES,
 };
 
-function getCachedPluginRegistry(cacheKey: string): PluginRegistry | undefined {
+function getCachedPluginRegistry(cacheKey: string): CachedPluginState | undefined {
   const cached = registryCache.get(cacheKey);
   if (!cached) {
     return undefined;
@@ -191,11 +200,11 @@ function getCachedPluginRegistry(cacheKey: string): PluginRegistry | undefined {
   return cached;
 }
 
-function setCachedPluginRegistry(cacheKey: string, registry: PluginRegistry): void {
+function setCachedPluginRegistry(cacheKey: string, state: CachedPluginState): void {
   if (registryCache.has(cacheKey)) {
     registryCache.delete(cacheKey);
   }
-  registryCache.set(cacheKey, registry);
+  registryCache.set(cacheKey, state);
   while (registryCache.size > MAX_PLUGIN_REGISTRY_CACHE_ENTRIES) {
     const oldestKey = registryCache.keys().next().value;
     if (!oldestKey) {
@@ -734,10 +743,11 @@ export function loadOpenClawPlugins(options: PluginLoadOptions = {}): PluginRegi
   if (cacheEnabled) {
     const cached = getCachedPluginRegistry(cacheKey);
     if (cached) {
+      restoreMemoryPromptSection(cached.memoryPromptBuilder);
       if (shouldActivate) {
-        activatePluginRegistry(cached, cacheKey);
+        activatePluginRegistry(cached.registry, cacheKey);
       }
-      return cached;
+      return cached.registry;
     }
   }
 
@@ -1289,7 +1299,10 @@ export function loadOpenClawPlugins(options: PluginLoadOptions = {}): PluginRegi
   maybeThrowOnPluginLoadError(registry, options.throwOnLoadError);
 
   if (cacheEnabled) {
-    setCachedPluginRegistry(cacheKey, registry);
+    setCachedPluginRegistry(cacheKey, {
+      registry,
+      memoryPromptBuilder: getMemoryPromptSectionBuilder(),
+    });
   }
   if (shouldActivate) {
     activatePluginRegistry(registry, cacheKey);

src/plugins/registry.ts

@@ -2,13 +2,13 @@ import path from "node:path";
 import type { AnyAgentTool } from "../agents/tools/common.js";
 import type { ChannelPlugin } from "../channels/plugins/types.js";
 import { registerContextEngineForOwner } from "../context-engine/registry.js";
-import { registerMemoryPromptSection } from "../memory/prompt-section.js";
 import type {
   GatewayRequestHandler,
   GatewayRequestHandlers,
 } from "../gateway/server-methods/types.js";
 import { registerInternalHook } from "../hooks/internal-hooks.js";
 import type { HookEntry } from "../hooks/types.js";
+import { registerMemoryPromptSection } from "../memory/prompt-section.js";
 import { resolveUserPath } from "../utils.js";
 import { registerPluginCommand, validatePluginCommandDefinition } from "./commands.js";
 import { normalizePluginHttpPath } from "./http-path.js";