diff --git a/tools/server/webui/src/lib/constants/cache.ts b/tools/server/webui/src/lib/constants/cache.ts
new file mode 100644
index 0000000000..dbd5dcbdde
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+++ b/tools/server/webui/src/lib/constants/cache.ts
@@ -0,0 +1,42 @@
+/**
+ * Cache configuration constants
+ */
+
+/**
+ * Default TTL (Time-To-Live) for cache entries in milliseconds
+ * @default 5 minutes
+ */
+export const DEFAULT_CACHE_TTL_MS = 5 * 60 * 1000;
+
+/**
+ * Default maximum number of entries in a cache
+ * @default 100
+ */
+export const DEFAULT_CACHE_MAX_ENTRIES = 100;
+
+/**
+ * TTL for model props cache in milliseconds
+ * Props don't change frequently, so we can cache them longer
+ * @default 10 minutes
+ */
+export const MODEL_PROPS_CACHE_TTL_MS = 10 * 60 * 1000;
+
+/**
+ * Maximum number of model props to cache
+ * @default 50
+ */
+export const MODEL_PROPS_CACHE_MAX_ENTRIES = 50;
+
+/**
+ * Maximum number of inactive conversation states to keep in memory
+ * States for conversations beyond this limit will be cleaned up
+ * @default 10
+ */
+export const MAX_INACTIVE_CONVERSATION_STATES = 10;
+
+/**
+ * Maximum age (in ms) for inactive conversation states before cleanup
+ * States older than this will be removed during cleanup
+ * @default 30 minutes
+ */
+export const INACTIVE_CONVERSATION_STATE_MAX_AGE_MS = 30 * 60 * 1000;