diff --git a/prompts/adaptive.txt b/prompts/adaptive.txt
index a61c271d..bd640852 100644
--- a/prompts/adaptive.txt
+++ b/prompts/adaptive.txt
@@ -345,15 +345,20 @@
 **重要**：position_size_usd 是**名义价值**（包含杠杆），非保证金需求。
 
 **计算步骤**：
-1. **可用保证金** = Available Cash × 0.95 × Allocation %（预留5%给手续费）
+1. **可用保证金** = Available Cash × 0.88（预留12%给手续费、滑点与清算保证金缓冲）
 2. **名义价值** = 可用保证金 × Leverage
 3. **position_size_usd** = 名义价值（这是 JSON 中应填写的值）
 4. **Position Size (Coins)** = position_size_usd / Current Price
 
-**示例**：Available Cash = $500, Leverage = 5x, Allocation = 100%
-- 可用保证金 = $500 × 0.95 × 100% = $475
-- position_size_usd = $475 × 5 = **$2,375** ← JSON 中填写此值
-- 实际占用保证金 = $475，剩余 $25 用于手续费
+**示例**：Available Cash = $500, Leverage = 5x
+- 可用保证金 = $500 × 0.88 = $440
+- position_size_usd = $440 × 5 = **$2,200** ← JSON 中填写此值
+- 实际占用保证金 = $440，剩余 $60 用于手续费、滑点与清算保护
+
+**示例2（小账户）**：Available Cash = $98.89, Leverage = 5x
+- 可用保证金 = $98.89 × 0.88 = $87.02
+- position_size_usd = $87.02 × 5 = **$435.10** ← JSON 中填写此值
+- 实际占用保证金 = $87.02，剩余 $11.87 用于手续费、滑点与清算保护
 
 ## 杠杆选择指引
 
diff --git a/prompts/default.txt b/prompts/default.txt
index 3094e473..ff01a508 100644
--- a/prompts/default.txt
+++ b/prompts/default.txt
@@ -111,15 +111,15 @@
 **重要**：`position_size_usd` 是**名义价值**（包含杠杆），非保证金需求。
 
 **计算步骤**：
-1. **可用保证金** = Available Cash × 0.95 × 配置比例（预留5%手续费）
+1. **可用保证金** = Available Cash × 0.88（预留12%给手续费、滑点与清算保证金缓冲）
 2. **名义价值** = 可用保证金 × Leverage
 3. **position_size_usd** = 名义价值（JSON中填写此值）
 4. **实际币数** = position_size_usd / Current Price
 
-**示例**：可用资金 $500，杠杆 5x，配置 100%
-- 可用保证金 = $500 × 0.95 = $475
-- position_size_usd = $475 × 5 = **$2,375** ← JSON填此值
-- 实际占用保证金 = $475，剩余 $25 用于手续费
+**示例**：可用资金 $500，杠杆 5x
+- 可用保证金 = $500 × 0.88 = $440
+- position_size_usd = $440 × 5 = **$2,200** ← JSON填此值
+- 实际占用保证金 = $440，剩余 $60 用于手续费、滑点与清算保护
 
 ---
 
diff --git a/prompts/nof1.txt b/prompts/nof1.txt
index 6b7df707..508f7431 100644
--- a/prompts/nof1.txt
+++ b/prompts/nof1.txt
@@ -55,15 +55,15 @@ You have exactly SIX possible actions per decision cycle:
 
 ## Calculation Steps:
 
-1. **Available Margin** = Available Cash × 0.95 × Allocation % (reserve 5% for fees)
+1. **Available Margin** = Available Cash × 0.88 (reserve 12% for fees, slippage & liquidation margin buffer)
 2. **Notional Value** = Available Margin × Leverage
 3. **position_size_usd** = Notional Value (this is the value for JSON)
 4. **Position Size (Coins)** = position_size_usd / Current Price
 
-**Example**: Available Cash = $500, Leverage = 5x, Allocation = 100%
-- Available Margin = $500 × 0.95 × 100% = $475
-- position_size_usd = $475 × 5 = **$2,375** ← Fill this value in JSON
-- Actual margin used = $475, remaining $25 for fees
+**Example**: Available Cash = $500, Leverage = 5x
+- Available Margin = $500 × 0.88 = $440
+- position_size_usd = $440 × 5 = **$2,200** ← Fill this value in JSON
+- Actual margin used = $440, remaining $60 for fees, slippage & liquidation protection
 
 ## Sizing Considerations