diff --git a/packages/tools/package.json b/packages/tools/package.json
index 39cde98d8..5195c058c 100644
--- a/packages/tools/package.json
+++ b/packages/tools/package.json
@@ -14,6 +14,7 @@
     "@ai-sdk/anthropic": "^2.0.25",
     "@ai-sdk/openai": "^2.0.23",
     "ai": "^5.0.29",
+    "lru-cache": "^11.2.6",
     "openai": "^4.104.0",
     "supermemory": "^3.0.0-alpha.26",
     "zod": "^4.1.5"
diff --git a/packages/tools/src/shared/cache.ts b/packages/tools/src/shared/cache.ts
index 9125b24ca..15ce16fe4 100644
--- a/packages/tools/src/shared/cache.ts
+++ b/packages/tools/src/shared/cache.ts
@@ -1,3 +1,4 @@
+import { LRUCache } from "lru-cache"
 import type { MemoryMode } from "./types"
 
 /**
@@ -5,7 +6,7 @@ import type { MemoryMode } from "./types"
  * Used to cache memory retrieval results during tool-call loops within the same turn.
  */
 export class MemoryCache<T = string> {
-	private cache: Map<string, T> = new Map()
+	private cache: LRUCache<string, T> = new LRUCache({ max: 100 })
 
 	/**
 	 * Generates a cache key for the current turn based on context parameters.