diff --git a/client/src/components/DynamicJsonForm.tsx b/client/src/components/DynamicJsonForm.tsx
index ecd150f22..4c3718394 100644
--- a/client/src/components/DynamicJsonForm.tsx
+++ b/client/src/components/DynamicJsonForm.tsx
@@ -27,7 +27,11 @@ interface DynamicJsonFormProps {
 }
 
 export interface DynamicJsonFormRef {
-  validateJson: () => { isValid: boolean; error: string | null };
+  validateJson: () => {
+    isValid: boolean;
+    error: string | null;
+    value: JsonValue;
+  };
   hasJsonError: () => boolean;
 }
 
@@ -211,10 +215,10 @@ const DynamicJsonForm = forwardRef<DynamicJsonFormRef, DynamicJsonFormProps>(
     };
 
     const validateJson = () => {
-      if (!isJsonMode) return { isValid: true, error: null };
+      if (!isJsonMode) return { isValid: true, error: null, value };
       try {
         const jsonStr = rawJsonValue?.trim();
-        if (!jsonStr) return { isValid: true, error: null };
+        if (!jsonStr) return { isValid: true, error: null, value };
         const parsed = JSON.parse(jsonStr);
         // Clear any pending debounced update and immediately update parent
         if (timeoutRef.current) {
@@ -222,12 +226,12 @@ const DynamicJsonForm = forwardRef<DynamicJsonFormRef, DynamicJsonFormProps>(
         }
         onChange(parsed);
         setJsonError(undefined);
-        return { isValid: true, error: null };
+        return { isValid: true, error: null, value: parsed };
       } catch (err) {
         const errorMessage =
           err instanceof Error ? err.message : "Invalid JSON";
         setJsonError(errorMessage);
-        return { isValid: false, error: errorMessage };
+        return { isValid: false, error: errorMessage, value };
       }
     };
 
diff --git a/client/src/components/Sidebar.tsx b/client/src/components/Sidebar.tsx
index 13a4f24f4..da77b4049 100644
--- a/client/src/components/Sidebar.tsx
+++ b/client/src/components/Sidebar.tsx
@@ -133,6 +133,39 @@ const Sidebar = ({
     [toast],
   );
 
+  const fallbackCopyText = useCallback((text: string) => {
+    const textarea = document.createElement("textarea");
+    textarea.value = text;
+    textarea.setAttribute("readonly", "");
+    textarea.style.position = "fixed";
+    textarea.style.left = "-9999px";
+    document.body.appendChild(textarea);
+    textarea.select();
+
+    const copied = document.execCommand("copy");
+    document.body.removeChild(textarea);
+
+    if (!copied) {
+      throw new Error("Clipboard copy fallback failed");
+    }
+  }, []);
+
+  const copyTextToClipboard = useCallback(
+    async (text: string) => {
+      if (navigator.clipboard?.writeText) {
+        try {
+          await navigator.clipboard.writeText(text);
+          return;
+        } catch {
+          // Fallback to execCommand in non-secure contexts or restricted permissions.
+        }
+      }
+
+      fallbackCopyText(text);
+    },
+    [fallbackCopyText],
+  );
+
   // Shared utility function to generate server config
   const generateServerConfig = useCallback(() => {
     if (transportType === "stdio") {
@@ -178,61 +211,51 @@ const Sidebar = ({
   }, [generateServerConfig]);
 
   // Memoized copy handlers
-  const handleCopyServerEntry = useCallback(() => {
+  const handleCopyServerEntry = useCallback(async () => {
     try {
       const configJson = generateMCPServerEntry();
-      navigator.clipboard
-        .writeText(configJson)
-        .then(() => {
-          setCopiedServerEntry(true);
-
-          toast({
-            title: "Config entry copied",
-            description:
-              transportType === "stdio"
-                ? "Server configuration has been copied to clipboard. Add this to your mcp.json inside the 'mcpServers' object with your preferred server name."
-                : transportType === "streamable-http"
-                  ? "Streamable HTTP URL has been copied. Use this URL directly in your MCP Client."
-                  : "SSE URL has been copied. Use this URL directly in your MCP Client.",
-          });
-
-          setTimeout(() => {
-            setCopiedServerEntry(false);
-          }, 2000);
-        })
-        .catch((error) => {
-          reportError(error);
-        });
+      await copyTextToClipboard(configJson);
+
+      setCopiedServerEntry(true);
+
+      toast({
+        title: "Config entry copied",
+        description:
+          transportType === "stdio"
+            ? "Server configuration has been copied to clipboard. Add this to your mcp.json inside the 'mcpServers' object with your preferred server name."
+            : transportType === "streamable-http"
+              ? "Streamable HTTP URL has been copied. Use this URL directly in your MCP Client."
+              : "SSE URL has been copied. Use this URL directly in your MCP Client.",
+      });
+
+      setTimeout(() => {
+        setCopiedServerEntry(false);
+      }, 2000);
     } catch (error) {
       reportError(error);
     }
-  }, [generateMCPServerEntry, transportType, toast, reportError]);
+  }, [generateMCPServerEntry, copyTextToClipboard, transportType, toast, reportError]);
 
-  const handleCopyServerFile = useCallback(() => {
+  const handleCopyServerFile = useCallback(async () => {
     try {
       const configJson = generateMCPServerFile();
-      navigator.clipboard
-        .writeText(configJson)
-        .then(() => {
-          setCopiedServerFile(true);
-
-          toast({
-            title: "Servers file copied",
-            description:
-              "Servers configuration has been copied to clipboard. Add this to your mcp.json file. Current testing server will be added as 'default-server'",
-          });
-
-          setTimeout(() => {
-            setCopiedServerFile(false);
-          }, 2000);
-        })
-        .catch((error) => {
-          reportError(error);
-        });
+      await copyTextToClipboard(configJson);
+
+      setCopiedServerFile(true);
+
+      toast({
+        title: "Servers file copied",
+        description:
+          "Servers configuration has been copied to clipboard. Add this to your mcp.json file. Current testing server will be added as 'default-server'",
+      });
+
+      setTimeout(() => {
+        setCopiedServerFile(false);
+      }, 2000);
     } catch (error) {
       reportError(error);
     }
-  }, [generateMCPServerFile, toast, reportError]);
+  }, [generateMCPServerFile, copyTextToClipboard, toast, reportError]);
 
   return (
     <div className="bg-card border-r border-border flex flex-col h-full">
diff --git a/client/src/components/ToolsTab.tsx b/client/src/components/ToolsTab.tsx
index febea1d8f..944fa6bb6 100644
--- a/client/src/components/ToolsTab.tsx
+++ b/client/src/components/ToolsTab.tsx
@@ -805,8 +805,20 @@ const ToolsTab = ({
                 )}
                 <Button
                   onClick={async () => {
-                    // Validate JSON inputs before calling tool
-                    if (checkValidationErrors(true)) return;
+                    const validatedParams: Record<string, unknown> = {
+                      ...params,
+                    };
+                    const hasErrors = Object.entries(formRefs.current).some(
+                      ([key, ref]) => {
+                        if (!ref) return false;
+                        const validation = ref.validateJson();
+                        if (!validation.isValid) return true;
+                        validatedParams[key] = validation.value;
+                        return false;
+                      },
+                    );
+                    setHasValidationErrors(hasErrors);
+                    if (hasErrors) return;
 
                     try {
                       setIsToolRunning(true);
@@ -826,7 +838,7 @@ const ToolsTab = ({
                       }, {});
                       await callTool(
                         selectedTool.name,
-                        params,
+                        validatedParams,
                         Object.keys(metadata).length ? metadata : undefined,
                         runAsTask,
                       );
diff --git a/client/src/components/__tests__/Sidebar.test.tsx b/client/src/components/__tests__/Sidebar.test.tsx
index 03e898ca9..12934e8ea 100644
--- a/client/src/components/__tests__/Sidebar.test.tsx
+++ b/client/src/components/__tests__/Sidebar.test.tsx
@@ -27,6 +27,11 @@ Object.defineProperty(navigator, "clipboard", {
     writeText: mockClipboardWrite,
   },
 });
+const mockExecCommand = jest.fn(() => true);
+Object.defineProperty(document, "execCommand", {
+  value: mockExecCommand,
+  writable: true,
+});
 
 // Setup fake timers
 jest.useFakeTimers();
@@ -76,6 +81,8 @@ describe("Sidebar", () => {
   beforeEach(() => {
     jest.clearAllMocks();
     jest.clearAllTimers();
+    mockClipboardWrite.mockResolvedValue(undefined);
+    mockExecCommand.mockReturnValue(true);
   });
 
   describe("Command and arguments", () => {
@@ -630,6 +637,51 @@ describe("Sidebar", () => {
       );
       expect(mockClipboardWrite).toHaveBeenCalledWith(expectedConfig);
     });
+
+    it("should fallback to execCommand when clipboard write fails for server entry", async () => {
+      mockClipboardWrite.mockRejectedValueOnce(new Error("NotAllowedError"));
+      renderSidebar({
+        transportType: "sse",
+        sseUrl: "http://localhost:3000/events",
+      });
+
+      await act(async () => {
+        const { serverEntry } = getCopyButtons();
+        fireEvent.click(serverEntry);
+        jest.runAllTimers();
+      });
+
+      expect(mockClipboardWrite).toHaveBeenCalledTimes(1);
+      expect(mockExecCommand).toHaveBeenCalledWith("copy");
+      expect(mockToast).toHaveBeenCalledWith({
+        title: "Config entry copied",
+        description:
+          "SSE URL has been copied. Use this URL directly in your MCP Client.",
+      });
+    });
+
+    it("should fallback to execCommand when clipboard write fails for servers file", async () => {
+      mockClipboardWrite.mockRejectedValueOnce(new Error("NotAllowedError"));
+      renderSidebar({
+        transportType: "stdio",
+        command: "node",
+        args: "server.js",
+      });
+
+      await act(async () => {
+        const { serversFile } = getCopyButtons();
+        fireEvent.click(serversFile);
+        jest.runAllTimers();
+      });
+
+      expect(mockClipboardWrite).toHaveBeenCalledTimes(1);
+      expect(mockExecCommand).toHaveBeenCalledWith("copy");
+      expect(mockToast).toHaveBeenCalledWith({
+        title: "Servers file copied",
+        description:
+          "Servers configuration has been copied to clipboard. Add this to your mcp.json file. Current testing server will be added as 'default-server'",
+      });
+    });
   });
 
   describe("Authentication", () => {
diff --git a/client/src/components/__tests__/ToolsTab.test.tsx b/client/src/components/__tests__/ToolsTab.test.tsx
index 5678914d6..73bef14dc 100644
--- a/client/src/components/__tests__/ToolsTab.test.tsx
+++ b/client/src/components/__tests__/ToolsTab.test.tsx
@@ -1100,6 +1100,36 @@ describe("ToolsTab", () => {
       expect(mockCallTool).toHaveBeenCalled();
     });
 
+    it("should run with latest JSON edits even before debounce completes", async () => {
+      const mockCallTool = jest.fn();
+      renderToolsTab({
+        tools: [toolWithJsonParams],
+        selectedTool: toolWithJsonParams,
+        callTool: mockCallTool,
+      });
+
+      const textareas = screen.getAllByRole("textbox");
+      expect(textareas.length).toBe(2);
+
+      fireEvent.change(textareas[0], {
+        target: { value: '{ "setting": "latest" }' },
+      });
+
+      const runButton = screen.getByRole("button", { name: /run tool/i });
+      await act(async () => {
+        fireEvent.click(runButton);
+      });
+
+      expect(mockCallTool).toHaveBeenCalledWith(
+        toolWithJsonParams.name,
+        expect.objectContaining({
+          config: { setting: "latest" },
+        }),
+        undefined,
+        false,
+      );
+    });
+
     it("should handle mixed valid and invalid JSON parameters", async () => {
       const mockCallTool = jest.fn();
       renderToolsTab({