diff --git a/decision/engine.go b/decision/engine.go
index 6672f339..2f96a15e 100644
--- a/decision/engine.go
+++ b/decision/engine.go
@@ -404,15 +404,15 @@ func buildSystemPrompt(accountEquity float64, btcEthLeverage, altcoinLeverage in
 	sb.WriteString("<decision>\n")
 	sb.WriteString("第二步: JSON决策数组\n\n")
 	sb.WriteString("```json\n[\n")
-	sb.WriteString(fmt.Sprintf("  {\"symbol\": \"BTCUSDT\", \"action\": \"open_short\", \"leverage\": %d, \"position_size_usd\": %.0f, \"stop_loss\": 97000, \"take_profit\": 91000, \"confidence\": 85, \"risk_usd\": 300, \"reasoning\": \"下跌趋势+MACD死叉\"},\n", btcEthLeverage, accountEquity*5))
-	sb.WriteString("  {\"symbol\": \"SOLUSDT\", \"action\": \"update_stop_loss\", \"new_stop_loss\": 155, \"reasoning\": \"移动止损至保本位\"},\n")
-	sb.WriteString("  {\"symbol\": \"ETHUSDT\", \"action\": \"close_long\", \"reasoning\": \"止盈离场\"}\n")
+	sb.WriteString(fmt.Sprintf("  {\"symbol\": \"BTCUSDT\", \"action\": \"open_short\", \"leverage\": %d, \"position_size_usd\": %.0f, \"stop_loss\": 97000, \"take_profit\": 91000, \"confidence\": 85, \"risk_usd\": 300},\n", btcEthLeverage, accountEquity*5))
+	sb.WriteString("  {\"symbol\": \"SOLUSDT\", \"action\": \"update_stop_loss\", \"new_stop_loss\": 155},\n")
+	sb.WriteString("  {\"symbol\": \"ETHUSDT\", \"action\": \"close_long\"}\n")
 	sb.WriteString("]\n```\n")
 	sb.WriteString("</decision>\n\n")
 	sb.WriteString("## 字段说明\n\n")
 	sb.WriteString("- `action`: open_long | open_short | close_long | close_short | update_stop_loss | update_take_profit | partial_close | hold | wait\n")
 	sb.WriteString("- `confidence`: 0-100（开仓建议≥75）\n")
-	sb.WriteString("- 开仓时必填: leverage, position_size_usd, stop_loss, take_profit, confidence, risk_usd, reasoning\n")
+	sb.WriteString("- 开仓时必填: leverage, position_size_usd, stop_loss, take_profit, confidence, risk_usd\n")
 	sb.WriteString("- update_stop_loss 时必填: new_stop_loss (注意是 new_stop_loss，不是 stop_loss)\n")
 	sb.WriteString("- update_take_profit 时必填: new_take_profit (注意是 new_take_profit，不是 take_profit)\n")
 	sb.WriteString("- partial_close 时必填: close_percentage (0-100)\n\n")
diff --git a/docs/prompt-guide.md b/docs/prompt-guide.md
index fb232070..71c7b34b 100644
--- a/docs/prompt-guide.md
+++ b/docs/prompt-guide.md
@@ -153,8 +153,7 @@ BTC broke support, MACD death cross, volume increased...
     "position_size_usd": 5000,
     "stop_loss": 97000,
     "take_profit": 91000,
-    "confidence": 85,
-    "reasoning": "Bearish technical turn"
+    "confidence": 85
   }
 ]
 ```
@@ -462,8 +461,7 @@ Your analysis...
     "stop_loss": 97000,
     "take_profit": 91000,
     "confidence": 85,
-    "risk_usd": 300,
-    "reasoning": "Bearish technical"
+    "risk_usd": 300
   }
 ]
 ```
@@ -500,14 +498,14 @@ Your analysis...
 {
   "symbol": "BTCUSDT",
   "action": "open_long",  // Open long
-  "reasoning": "This is a great long opportunity because..."  // Too long
+  "confidence": 80  // Only necessary fields
 }
 
 // Correct
 {
   "symbol": "BTCUSDT",
   "action": "open_long",
-  "reasoning": "MACD golden cross + volume surge"
+  "confidence": 85
 }
 ```
 
diff --git a/docs/prompt-guide.zh-CN.md b/docs/prompt-guide.zh-CN.md
index a853a92f..f9f22328 100644
--- a/docs/prompt-guide.zh-CN.md
+++ b/docs/prompt-guide.zh-CN.md
@@ -153,8 +153,7 @@ BTC 跌破支撑位，MACD 死叉，成交量放大...
     "position_size_usd": 5000,
     "stop_loss": 97000,
     "take_profit": 91000,
-    "confidence": 85,
-    "reasoning": "技术面转空"
+    "confidence": 85
   }
 ]
 ```
@@ -462,8 +461,7 @@ AI 必须按照以下格式输出决策：
     "stop_loss": 97000,
     "take_profit": 91000,
     "confidence": 85,
-    "risk_usd": 300,
-    "reasoning": "技术面转空"
+    "risk_usd": 300
   }
 ]
 ```
@@ -500,14 +498,14 @@ AI 必须按照以下格式输出决策：
 {
   "symbol": "BTCUSDT",
   "action": "open_long",  // 开多仓
-  "reasoning": "这是一个很好的做多机会，因为..."  // 太长
+  "confidence": 80  // 只需要必要字段
 }
 
 // 正确
 {
   "symbol": "BTCUSDT",
   "action": "open_long",
-  "reasoning": "MACD金叉+成交量放大"
+  "confidence": 85
 }
 ```
 
diff --git a/mcp/deepseek_client.go b/mcp/deepseek_client.go
index 62e28490..2a124c8b 100644
--- a/mcp/deepseek_client.go
+++ b/mcp/deepseek_client.go
@@ -6,7 +6,7 @@ import (
 
 const (
 	ProviderDeepSeek       = "deepseek"
-	DefaultDeepSeekBaseURL = "https://api.deepseek.com/v1"
+	DefaultDeepSeekBaseURL = "https://api.deepseek.com"
 	DefaultDeepSeekModel   = "deepseek-chat"
 )