diff --git a/internal/agent/core/process.go b/internal/agent/core/process.go
index 39f9333..529a036 100644
--- a/internal/agent/core/process.go
+++ b/internal/agent/core/process.go
@@ -305,6 +305,12 @@ func (a *Agent) process(input string, stageCtx *sdk.StageContext) (response stri
 					result = r
 				}
 			}
+			// ContextPolicy: prune 工具调用后执行上下文裁剪（§13.8）
+			if def := a.stageHost.ToolDef(tc.Name); def != nil && def.ContextPolicy == "prune" {
+				if a.context != nil {
+					a.context.Prune(result, 20, a.docStore)
+				}
+			}
 
 			msgContent := ""
 			if contentOnce {
diff --git a/third_party/homeagent-sdk/sdk/plugin.go b/third_party/homeagent-sdk/sdk/plugin.go
index ebd234d..8e70255 100644
--- a/third_party/homeagent-sdk/sdk/plugin.go
+++ b/third_party/homeagent-sdk/sdk/plugin.go
@@ -106,6 +106,7 @@ type ToolDef struct {
 	Parameters  map[string]interface{} `json:"parameters"`
 	NoMemory    bool                   `json:"no_memory,omitempty"` // 此工具输出不参与记忆计算，但原文保留
 	Cleaner     func(string) string    `json:"-"`                   // 计算层过滤函数，不改原文；仅在向量化/jieba/蒸馏时调用
+	ContextPolicy string               `json:"context_policy,omitempty"` // 工具上下文策略："none"(默认) / "prune"
 }
 
 // IOInjector provides methods for injecting input and interrupts into the agent pipeline.