diff --git a/packages/tools/src/tool-metadata.ts b/packages/tools/src/tool-metadata.ts
index 296588ff..0ac62c55 100644
--- a/packages/tools/src/tool-metadata.ts
+++ b/packages/tools/src/tool-metadata.ts
@@ -125,16 +125,18 @@ export const ENGLISH_TOOL_METADATA: Record<string, EnglishToolMetadata> = {
     description:
       'Analyze the response-speed ranking of chat members, based on the median and mean of their reply intervals.',
     properties: {
-      days: 'Number of most recent days of data to analyze. Defaults to 30.',
       top_n: 'Number of top-ranked members to return. Defaults to 10.',
+      start_time: 'Start time in YYYY-MM-DD HH:mm format.',
+      end_time: 'End time in YYYY-MM-DD HH:mm format.',
     },
   },
   keyword_frequency: {
     description:
       'Count the most frequent keywords in the chat, analyzing message content through NLP word segmentation.',
     properties: {
-      days: 'Number of most recent days of data to analyze. Defaults to 30.',
       top_n: 'Number of top frequent words to return. Defaults to 50.',
+      start_time: 'Start time in YYYY-MM-DD HH:mm format.',
+      end_time: 'End time in YYYY-MM-DD HH:mm format.',
     },
   },
   semantic_search_current_chat: {