diff --git a/server/2015Remote/McpServer.cpp b/server/2015Remote/McpServer.cpp
index a234ea2..29d47fd 100644
--- a/server/2015Remote/McpServer.cpp
+++ b/server/2015Remote/McpServer.cpp
@@ -1134,9 +1134,12 @@ Json::Value BuildRemoteCloseInputSchema();
 Json::Value BuildRemoteCloseOutputSchema();
 Json::Value BuildRemoteKeyboardInputSchema();
 Json::Value BuildRemoteKeyboardOutputSchema();
+Json::Value BuildRemoteMouseInputSchema();
+Json::Value BuildRemoteMouseOutputSchema();
 std::string BuildRemoteOpen(const Json::Value& id, const Json::Value& args, CMy2015RemoteDlg* parent);
 std::string BuildRemoteClose(const Json::Value& id, const Json::Value& args, CMy2015RemoteDlg* parent);
 std::string BuildRemoteKeyboard(const Json::Value& id, const Json::Value& args, CMy2015RemoteDlg* parent);
+std::string BuildRemoteMouse(const Json::Value& id, const Json::Value& args, CMy2015RemoteDlg* parent);
 
 // tools/list
 std::string BuildToolsListResult(const Json::Value& id) {
@@ -1368,6 +1371,14 @@ std::string BuildToolsListResult(const Json::Value& id) {
             tool["outputSchema"] = BuildRemoteKeyboardOutputSchema();
             tools.append(tool);
         }
+        {
+            Json::Value tool(Json::objectValue);
+            tool["name"] = "remote_mouse";
+            tool["description"] = u8"向已建立的远程控制会话注入鼠标事件。action 可选 move / down / up / click / right_click / middle_click / drag / scroll；坐标 x/y（及 drag 的 x2/y2）为归一化 0..1 浮点。button 可选 left/middle/right（默认 left）；click 的 clicks 可选 1/2/3（默认 1）；scroll 的 delta 正=向下滚、负=向上滚。";
+            tool["inputSchema"] = BuildRemoteMouseInputSchema();
+            tool["outputSchema"] = BuildRemoteMouseOutputSchema();
+            tools.append(tool);
+        }
     }
 
     result["tools"] = tools;
@@ -3113,6 +3124,290 @@ std::string BuildRemoteKeyboard(const Json::Value& id, const Json::Value& args,
     return BuildResult(id, result);
 }
 
+// ===== P5：remote_mouse（鼠标注入，move/down/up/click/right_click/middle_click/drag/scroll）=====
+
+// 读取归一化坐标（0..1 浮点，接受 JSON number 或数字字符串），越界钳到 [0,1]。
+static bool GetNormCoord(const Json::Value& args, const char* key, double& out, std::string& err) {
+    if (!args.isMember(key)) { err = std::string("Missing required parameter: ") + key; return false; }
+    const Json::Value& v = args[key];
+    if (v.isNumeric()) {
+        out = v.asDouble();
+    } else if (v.isString()) {
+        const std::string s = v.asString();
+        if (s.empty()) { err = std::string("Invalid ") + key + ": expected a number in 0..1"; return false; }
+        char* end = nullptr;
+        double d = strtod(s.c_str(), &end);
+        if (end == s.c_str() || *end != '\0') { err = std::string("Invalid ") + key + ": expected a number in 0..1"; return false; }
+        out = d;
+    } else {
+        err = std::string("Invalid ") + key + ": expected a number in 0..1";
+        return false;
+    }
+    if (out != out) {   // NaN（如字符串 "nan"）会绕过钳制并令 (int)(n*screen) 未定义行为
+        err = std::string("Invalid ") + key + ": not a finite number";
+        return false;
+    }
+    if (out < 0.0) out = 0.0;
+    if (out > 1.0) out = 1.0;
+    return true;
+}
+
+// 读取可选整数参数（JSON number 或数字字符串）；缺失/非法返回 false（不写 out）。
+static bool GetIntArg(const Json::Value& args, const char* key, int& out) {
+    if (!args.isMember(key)) return false;
+    const Json::Value& v = args[key];
+    if (v.isNumeric()) { out = v.asInt(); return true; }
+    if (v.isString()) {
+        const std::string s = v.asString();
+        if (IsDigits(s) || (!s.empty() && s[0] == '-' && IsDigits(s.substr(1)))) {
+            out = atoi(s.c_str());
+            return true;
+        }
+    }
+    return false;
+}
+
+// button 字符串 → 0=左/1=中/2=右；空或 left 默认左。
+static bool ParseButton(const std::string& s, int& out) {
+    if (s.empty() || s == "left")  { out = 0; return true; }
+    if (s == "middle")             { out = 1; return true; }
+    if (s == "right")              { out = 2; return true; }
+    return false;
+}
+
+// button → 按下/抬起消息 + 按下 wParam（对齐 WebService::HandleMouse）。
+static void ButtonMessages(int button, UINT& downMsg, UINT& upMsg, uint64_t& downWParam) {
+    if (button == 1)      { downMsg = WM_MBUTTONDOWN; upMsg = WM_MBUTTONUP; downWParam = MK_MBUTTON; }
+    else if (button == 2) { downMsg = WM_RBUTTONDOWN; upMsg = WM_RBUTTONUP; downWParam = MK_RBUTTON; }
+    else                  { downMsg = WM_LBUTTONDOWN; upMsg = WM_LBUTTONUP; downWParam = MK_LBUTTON; }
+}
+
+Json::Value BuildRemoteMouseInputSchema() {
+    Json::Value props(Json::objectValue);
+    Json::Value idProp(Json::objectValue);
+    idProp["type"] = "string";
+    idProp["description"] = u8"主机 id，取 list_online_hosts / search_hosts 返回的 id 字段";
+    props["id"] = idProp;
+
+    Json::Value sid(Json::objectValue);
+    sid["type"] = "string";
+    sid["description"] = u8"remote_open 返回的 session_id";
+    props["session_id"] = sid;
+
+    Json::Value act(Json::objectValue);
+    act["type"] = "string";
+    act["description"] = u8"动作：move / down / up / click / right_click / middle_click / drag / scroll";
+    Json::Value actEnum(Json::arrayValue);
+    actEnum.append("move"); actEnum.append("down"); actEnum.append("up"); actEnum.append("click");
+    actEnum.append("right_click"); actEnum.append("middle_click"); actEnum.append("drag"); actEnum.append("scroll");
+    act["enum"] = actEnum;
+    props["action"] = act;
+
+    Json::Value xProp(Json::objectValue);
+    xProp["type"] = "number";
+    xProp["description"] = u8"归一化 X 坐标（0=屏幕最左，1=最右）";
+    props["x"] = xProp;
+
+    Json::Value yProp(Json::objectValue);
+    yProp["type"] = "number";
+    yProp["description"] = u8"归一化 Y 坐标（0=屏幕最上，1=最下）";
+    props["y"] = yProp;
+
+    Json::Value x2Prop(Json::objectValue);
+    x2Prop["type"] = "number";
+    x2Prop["description"] = u8"拖拽终点 X（仅 drag）";
+    props["x2"] = x2Prop;
+
+    Json::Value y2Prop(Json::objectValue);
+    y2Prop["type"] = "number";
+    y2Prop["description"] = u8"拖拽终点 Y（仅 drag）";
+    props["y2"] = y2Prop;
+
+    Json::Value btn(Json::objectValue);
+    btn["type"] = "string";
+    btn["description"] = u8"按键：left / middle / right（默认 left）";
+    Json::Value btnEnum(Json::arrayValue);
+    btnEnum.append("left"); btnEnum.append("middle"); btnEnum.append("right");
+    btn["enum"] = btnEnum;
+    props["button"] = btn;
+
+    Json::Value clk(Json::objectValue);
+    clk["type"] = "integer";
+    clk["description"] = u8"点击次数 1/2/3（仅 click，默认 1）";
+    props["clicks"] = clk;
+
+    Json::Value del(Json::objectValue);
+    del["type"] = "integer";
+    del["description"] = u8"滚动量（仅 scroll；正=向下滚，负=向上滚，与 Web 控制台一致；仅垂直滚轮，忽略 button）";
+    props["delta"] = del;
+
+    Json::Value schema(Json::objectValue);
+    schema["type"] = "object";
+    schema["properties"] = props;
+    Json::Value required(Json::arrayValue);
+    required.append("id");
+    required.append("session_id");
+    required.append("action");
+    required.append("x");
+    required.append("y");
+    schema["required"] = required;
+    return schema;
+}
+
+Json::Value BuildRemoteMouseOutputSchema() {
+    Json::Value props(Json::objectValue);
+    Json::Value schema(Json::objectValue);
+    schema["type"] = "object";
+    schema["properties"] = props;
+    return schema;
+}
+
+// tools/call：remote_mouse（鼠标注入；归一化坐标 → 物理像素）
+std::string BuildRemoteMouse(const Json::Value& id, const Json::Value& args, CMy2015RemoteDlg* parent) {
+    CMcpServer& mcp = CMcpServer::Instance();
+    mcp.SweepIdleScreenCtrl(kScreenCtrlIdleTimeoutSec);
+
+    uint64_t devId = 0;
+    context* ctx = nullptr;
+    std::string errJson;
+    if (!ResolveScreenCtrlSessionHost(id, args, parent, devId, ctx, errJson))
+        return errJson;
+
+    std::string sessionId = GetStringArg(args, "session_id");
+    if (sessionId.empty())
+        return BuildError(id, -32602, "Missing required parameter: session_id");
+
+    std::string action = GetStringArg(args, "action");
+    if (action.empty())
+        return BuildError(id, -32602, "Missing required parameter: action");
+
+    // ---- 纯参数解析（不依赖会话分辨率；BeginScreenCtrlAction 之后再无提前返回）----
+    bool knownAction =
+        action == "move" || action == "down" || action == "up" || action == "click" ||
+        action == "right_click" || action == "middle_click" || action == "drag" || action == "scroll";
+    if (!knownAction)
+        return BuildError(id, -32602, "Unknown action: " + action);
+
+    int button = 0;
+    std::string buttonStr = GetStringArg(args, "button");
+    if (!ParseButton(buttonStr, button))
+        return BuildError(id, -32602, "Invalid button: " + buttonStr + " (expected left/middle/right)");
+
+    int clicks = 1;
+    if (args.isMember("clicks")) {
+        if (!GetIntArg(args, "clicks", clicks))
+            return BuildError(id, -32602, "clicks must be an integer 1..3");
+        if (clicks < 1 || clicks > 3)
+            return BuildError(id, -32602, "clicks must be 1, 2 or 3");
+    }
+
+    int delta = 0;
+    if (args.isMember("delta") && !GetIntArg(args, "delta", delta))
+        return BuildError(id, -32602, "delta must be an integer");
+
+    int notches = 0;   // scroll 实际注入的滚动档数（= clamp(delta, -10, 10)），审计用
+
+    double nx = 0, ny = 0, nx2 = 0, ny2 = 0;
+    std::string coordErr;
+    if (!GetNormCoord(args, "x", nx, coordErr)) return BuildError(id, -32602, coordErr);
+    if (!GetNormCoord(args, "y", ny, coordErr)) return BuildError(id, -32602, coordErr);
+    if (action == "drag") {
+        if (!GetNormCoord(args, "x2", nx2, coordErr)) return BuildError(id, -32602, coordErr);
+        if (!GetNormCoord(args, "y2", ny2, coordErr)) return BuildError(id, -32602, coordErr);
+    }
+
+    // 校验 session_id/busy 并置 busy，同时取物理分辨率（screenW/H>0 由会话就绪保证）。
+    context* subCtx = nullptr;
+    int screenW = 0, screenH = 0;
+    int r = mcp.BeginScreenCtrlAction(devId, sessionId, subCtx, screenW, screenH);
+    if (r == 2) return BuildError(id, -32003, "Device busy: another injection is in flight for this session");
+    if (r == 1) return BuildError(id, -32002, "Remote control session not found, not ready, or closed: " + sessionId);
+
+    // 归一化坐标 → 物理像素（round + clamp 到 [0, screen-1]）
+    auto toPxX = [&](double n) -> int { int p = (int)(n * screenW + 0.5); return p < 0 ? 0 : (p > screenW - 1 ? screenW - 1 : p); };
+    auto toPxY = [&](double n) -> int { int p = (int)(n * screenH + 0.5); return p < 0 ? 0 : (p > screenH - 1 ? screenH - 1 : p); };
+    int px = toPxX(nx), py = toPxY(ny);
+    int px2 = 0, py2 = 0;
+
+    UINT downMsg, upMsg; uint64_t downWParam;
+    ButtonMessages(button, downMsg, upMsg, downWParam);
+
+    // 组装注入批次（按发送顺序；每个 MSG64 由客户端 ProcessCommand 分发到 SendInput）
+    std::vector<MSG64> batch;
+    if (action == "move") {
+        batch.push_back(BuildMouseMsg64(px, py, WM_MOUSEMOVE, 0));
+    } else if (action == "down") {
+        batch.push_back(BuildMouseMsg64(px, py, downMsg, downWParam));
+    } else if (action == "up") {
+        batch.push_back(BuildMouseMsg64(px, py, upMsg, 0));
+    } else if (action == "click" || action == "right_click" || action == "middle_click") {
+        int b = (action == "right_click") ? 2 : (action == "middle_click" ? 1 : button);
+        UINT dMsg, uMsg; uint64_t dW;
+        ButtonMessages(b, dMsg, uMsg, dW);
+        for (int i = 0; i < clicks; ++i) {
+            batch.push_back(BuildMouseMsg64(px, py, dMsg, dW));
+            batch.push_back(BuildMouseMsg64(px, py, uMsg, 0));
+        }
+    } else if (action == "drag") {
+        px2 = toPxX(nx2); py2 = toPxY(ny2);
+        batch.push_back(BuildMouseMsg64(px, py, downMsg, downWParam));
+        batch.push_back(BuildMouseMsg64(px2, py2, WM_MOUSEMOVE, 0));
+        batch.push_back(BuildMouseMsg64(px2, py2, upMsg, 0));
+    } else if (action == "scroll") {
+        // delta 正=向下滚（与 Web 控制台一致）；WM_MOUSEWHEEL 负值=向下滚，故取反。
+        // 客户端对 WM_MOUSEWHEEL 会先 SetCursorPos(x,y) 再 MOUSEEVENTF_WHEEL，单条消息即可定位+滚动。
+        notches = delta;
+        if (notches > 10) notches = 10;
+        if (notches < -10) notches = -10;
+        short wheelDelta = (short)(-notches * 120);
+        batch.push_back(BuildMouseMsg64(px, py, WM_MOUSEWHEEL, MAKEWPARAM(0, wheelDelta)));
+    }
+
+    // 组包 [COMMAND_SCREEN_CONTROL][MSG64*N]，经屏幕子连接发送（主连接无效，设计 P2）。
+    const int len = (int)(1 + batch.size() * sizeof(MSG64));
+    std::vector<BYTE> packet((size_t)len);
+    packet[0] = COMMAND_SCREEN_CONTROL;
+    memcpy(packet.data() + 1, batch.data(), batch.size() * sizeof(MSG64));
+    bool ok = subCtx->Send2Client(packet.data(), (ULONG)len) != FALSE;
+
+    mcp.EndScreenCtrlAction(devId, sessionId);
+
+    if (!ok)
+        return BuildError(id, -32004, "Failed to send mouse injection");
+
+    // 审计（不可关闭；含归一化坐标与换算后的物理像素）
+    if (parent) {
+        std::string audit = "host " + std::to_string(devId) + " remote-mouse: session " + sessionId
+                          + " action=" + action;
+        char cbuf[96];
+        sprintf(cbuf, " norm=(%.3f,%.3f) px=(%d,%d)", nx, ny, px, py);
+        audit += cbuf;
+        if (action == "drag") {
+            sprintf(cbuf, " -> norm2=(%.3f,%.3f) px2=(%d,%d)", nx2, ny2, px2, py2);
+            audit += cbuf;
+        }
+        if (action == "scroll")
+            audit += " notches=" + std::to_string(notches);
+        if (action == "click" || action == "right_click" || action == "middle_click")
+            audit += " clicks=" + std::to_string(clicks);
+        parent->PostMessageA(WM_SHOWERRORMSG,
+            (WPARAM)new CString(ToAnsi(audit, 936).c_str()),
+            (LPARAM)new CString(_TR("MCP远程控制")));
+    }
+
+    Json::Value result(Json::objectValue);
+    result["structuredContent"] = Json::Value(Json::objectValue);
+    Json::Value content(Json::arrayValue);
+    Json::Value item(Json::objectValue);
+    item["type"] = "text";
+    item["text"] = std::string(u8"ok");
+    content.append(item);
+    result["content"] = content;
+    result["isError"] = false;
+
+    return BuildResult(id, result);
+}
+
 // tools/call 分派
 std::string BuildToolsCall(const Json::Value& root, CMy2015RemoteDlg* parent) {
     const Json::Value& id = root["id"];
@@ -3144,6 +3439,7 @@ std::string BuildToolsCall(const Json::Value& root, CMy2015RemoteDlg* parent) {
     if (toolName == "remote_open")       return BuildRemoteOpen(id, args, parent);
     if (toolName == "remote_close")      return BuildRemoteClose(id, args, parent);
     if (toolName == "remote_keyboard")   return BuildRemoteKeyboard(id, args, parent);
+    if (toolName == "remote_mouse")      return BuildRemoteMouse(id, args, parent);
 
     return BuildError(id, -32602,
                       "Unknown tool: " + (toolName.empty() ? std::string("(empty)") : toolName));
diff --git a/server/2015Remote/WebService.cpp b/server/2015Remote/WebService.cpp
index b969159..2b98056 100644
--- a/server/2015Remote/WebService.cpp
+++ b/server/2015Remote/WebService.cpp
@@ -799,34 +799,18 @@ void CWebService::HandleMouse(void* ws_ptr, const std::string& msg) {
         return;
     }
 
-    // Build MSG64 structure
-    MSG64 msg64;
-    memset(&msg64, 0, sizeof(MSG64));
-    msg64.pt.x = x;
-    msg64.pt.y = y;
-    msg64.lParam = MAKELPARAM(x, y);
-    msg64.time = GetTickCount();
+    // Build MSG64 structure（共享 helper，见 WebService.h；与 MCP remote_mouse 复用）
+    MSG64 msg64 = BuildMouseMsg64(x, y, 0, 0);   // 默认 WM_NULL；未知 button 时仍发送（保持原行为）
 
     // Map type and button to Windows message
     if (type == "down") {
-        if (button == 0) {
-            msg64.message = WM_LBUTTONDOWN;
-            msg64.wParam = MK_LBUTTON;
-        } else if (button == 1) {
-            msg64.message = WM_MBUTTONDOWN;
-            msg64.wParam = MK_MBUTTON;
-        } else if (button == 2) {
-            msg64.message = WM_RBUTTONDOWN;
-            msg64.wParam = MK_RBUTTON;
-        }
+        if (button == 0)      { msg64.message = WM_LBUTTONDOWN; msg64.wParam = MK_LBUTTON; }
+        else if (button == 1) { msg64.message = WM_MBUTTONDOWN; msg64.wParam = MK_MBUTTON; }
+        else if (button == 2) { msg64.message = WM_RBUTTONDOWN; msg64.wParam = MK_RBUTTON; }
     } else if (type == "up") {
-        if (button == 0) {
-            msg64.message = WM_LBUTTONUP;
-        } else if (button == 1) {
-            msg64.message = WM_MBUTTONUP;
-        } else if (button == 2) {
-            msg64.message = WM_RBUTTONUP;
-        }
+        if (button == 0)      { msg64.message = WM_LBUTTONUP; }
+        else if (button == 1) { msg64.message = WM_MBUTTONUP; }
+        else if (button == 2) { msg64.message = WM_RBUTTONUP; }
     } else if (type == "move") {
         msg64.message = WM_MOUSEMOVE;
     } else if (type == "wheel") {
@@ -845,13 +829,8 @@ void CWebService::HandleMouse(void* ws_ptr, const std::string& msg) {
         if (clientType != GetClientType(CLIENT_TYPE_MACOS) && clientType != "macOS") {
             return;  // Skip dblclick for non-macOS clients
         }
-        if (button == 0) {
-            msg64.message = WM_LBUTTONDBLCLK;
-            msg64.wParam = MK_LBUTTON;
-        } else if (button == 2) {
-            msg64.message = WM_RBUTTONDBLCLK;
-            msg64.wParam = MK_RBUTTON;
-        }
+        if (button == 0)      { msg64.message = WM_LBUTTONDBLCLK; msg64.wParam = MK_LBUTTON; }
+        else if (button == 2) { msg64.message = WM_RBUTTONDBLCLK; msg64.wParam = MK_RBUTTON; }
     } else {
         return;  // Unknown type
     }
diff --git a/server/2015Remote/WebService.h b/server/2015Remote/WebService.h
index 2fdeeed..f312822 100644
--- a/server/2015Remote/WebService.h
+++ b/server/2015Remote/WebService.h
@@ -48,6 +48,21 @@ inline MSG64 BuildKeyMsg64(int keyCode, bool isDown, bool isSysKey) {
     return msg64;
 }
 
+// 构造单个鼠标注入 MSG64（复用 WebService::HandleMouse 的基座字段逻辑，抽取为共享 helper，
+// 供 Web 与 MCP 远程控制两处使用，见 docs/Mcp_RemoteControl_Design.md §6.2）。
+// x/y 为物理像素坐标（已由调用方从归一化坐标映射）；message/wParam 由调用方按动作设定。
+inline MSG64 BuildMouseMsg64(int x, int y, UINT message, uint64_t wParam) {
+    MSG64 msg64;
+    memset(&msg64, 0, sizeof(MSG64));
+    msg64.pt.x    = x;
+    msg64.pt.y    = y;
+    msg64.lParam  = MAKELPARAM(x, y);
+    msg64.time    = GetTickCount();
+    msg64.message = message;
+    msg64.wParam  = wParam;
+    return msg64;
+}
+
 // Web client state
 struct WebClient {
     std::string token;