diff --git a/server-rs/crates/platform-editor-agent/src/agent/prompt.rs b/server-rs/crates/platform-editor-agent/src/agent/prompt.rs
index f9f498766..fc1bc4b41 100644
--- a/server-rs/crates/platform-editor-agent/src/agent/prompt.rs
+++ b/server-rs/crates/platform-editor-agent/src/agent/prompt.rs
@@ -81,3 +81,114 @@ pub fn generate_ui_design_tool_description() -> String {
         "仅用于生成完整可用的 UI 设计图或界面稿，包括 HUD、弹窗、面板、按钮组合和整页界面。不要用于提取图标、拆素材；{EXISTING_IMAGE_EDIT_POLICY}。UI 规范图、组件规范展板或视觉规范展板属于规范展板，{SPEC_BOARD_ROUTE_POLICY}。只能输出一张图"
     )
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use platform_agent_harness::prompt::build_tools_system_prompt;
+    use platform_llm::LlmMessageRole;
+    use shared_contracts::editor_agent::{
+        EDITOR_AGENT_MESSAGES_DOCUMENT_VERSION, EditorAgentMessage,
+    };
+
+    #[test]
+    fn business_prompt_keeps_pending_confirmation_and_cancellation_policy() {
+        let prompt = editor_agent_system_prompt();
+
+        assert!(prompt.contains("pending confirmation/completed/cancelled"));
+        assert!(prompt.contains("用户界面工具消息的确认/取消按钮"));
+        assert!(prompt.contains("引导他使用确认/取消按钮"));
+        assert!(prompt.contains("禁止在对话中dump参数"));
+    }
+
+    #[test]
+    fn business_prompt_allows_new_calls_after_cancelled_or_pending_calls() {
+        let prompt = editor_agent_system_prompt();
+
+        assert!(prompt.contains("已经被用户取消的工具调用是无法再次被确认的"));
+        assert!(prompt.contains("如果用户明确要修改, 请发起新工具调用"));
+        assert!(prompt.contains("一个等待确认的工具调用不影响另一个工具调用的发起"));
+        assert!(prompt.contains("不要因为尚未确认或完成就拒绝发起另一个"));
+    }
+
+    #[test]
+    fn final_business_prompt_batches_independent_calls_but_keeps_serial_execution() {
+        let prompt = build_tools_system_prompt(editor_agent_system_prompt(), &[]);
+
+        assert!(prompt.contains("尽可能多(无依赖)的工具调用"));
+        assert!(prompt.contains("尽量批量"));
+        assert!(prompt.contains("(sequentially inside)"));
+        assert!(prompt.contains("call them in a batch instead of one call per turn"));
+    }
+
+    #[test]
+    fn prompt_memory_keeps_only_the_latest_window_before_history_end() {
+        let messages = (0..20)
+            .map(|index| EditorAgentMessage {
+                id: index,
+                client_message_id: None,
+                role: match index % 3 {
+                    0 => EditorAgentMessageRole::User,
+                    1 => EditorAgentMessageRole::Assistant,
+                    _ => EditorAgentMessageRole::System,
+                },
+                text: format!("message-{index}"),
+                attachments: Vec::new(),
+                tool_call: None,
+                created_at: format!("created-{index}"),
+            })
+            .collect::<Vec<_>>();
+        let document = EditorAgentConversationMessagesDocument {
+            version: EDITOR_AGENT_MESSAGES_DOCUMENT_VERSION,
+            conversation_id: "conversation-1".to_string(),
+            messages,
+        };
+
+        let memory = build_prompt_memory(&document, 19);
+
+        assert_eq!(memory.len(), EDITOR_AGENT_MAX_RECENT_PROMPT_MESSAGES);
+        for (offset, message) in memory.iter().enumerate() {
+            let source_index = offset + 1;
+            assert_eq!(message.content, format!("message-{source_index}"));
+            assert_eq!(
+                message.role,
+                match source_index % 3 {
+                    0 => LlmMessageRole::User,
+                    1 => LlmMessageRole::Assistant,
+                    _ => LlmMessageRole::System,
+                }
+            );
+        }
+        assert!(memory.iter().all(|message| message.content != "message-0"));
+        assert!(memory.iter().all(|message| message.content != "message-19"));
+    }
+
+    #[test]
+    fn business_prompt_requests_a_new_reference_when_history_is_outside_the_window() {
+        let prompt = editor_agent_system_prompt();
+
+        assert!(prompt.contains("滑动窗口上下文有限"));
+        assert!(prompt.contains("可能被历史截断了"));
+        assert!(prompt.contains("请求用户重新引用"));
+        assert!(prompt.contains("但不是告诉你image_id"));
+    }
+
+    #[test]
+    fn tool_descriptions_keep_edit_and_spec_board_routes_consistent() {
+        let edit_image = edit_image_tool_description();
+        let generate_image = generate_image_tool_description();
+        let character = generate_character_tool_description();
+        let icons = generate_icon_spritesheet_tool_description();
+        let ui = generate_ui_design_tool_description();
+
+        assert!(edit_image.contains(EXISTING_IMAGE_EDIT_POLICY));
+        assert!(generate_image.contains(EXISTING_IMAGE_EDIT_POLICY));
+        assert!(generate_image.contains(SPEC_BOARD_ROUTE_POLICY));
+        assert!(generate_image.contains(SPEC_BOARD_CONTENT_POLICY));
+        assert!(character.contains(EXISTING_IMAGE_EDIT_POLICY));
+        assert!(character.contains(SPEC_BOARD_ROUTE_POLICY));
+        assert!(icons.contains(SPEC_BOARD_ROUTE_POLICY));
+        assert!(ui.contains(EXISTING_IMAGE_EDIT_POLICY));
+        assert!(ui.contains(SPEC_BOARD_ROUTE_POLICY));
+    }
+}