diff --git a/client/src/components/ToolsTab.tsx b/client/src/components/ToolsTab.tsx
index cf85e4eb4..9e4bc69a1 100644
--- a/client/src/components/ToolsTab.tsx
+++ b/client/src/components/ToolsTab.tsx
@@ -173,12 +173,13 @@ const ToolsTab = ({
                             name={key}
                             placeholder={prop.description}
                             value={(params[key] as string) ?? ""}
-                            onChange={(e) =>
+                            onChange={(e) => {
+                              const value = e.target.value;
                               setParams({
                                 ...params,
-                                [key]: Number(e.target.value),
-                              })
-                            }
+                                [key]: value === "" ? "" : Number(value),
+                              });
+                            }}
                             className="mt-1"
                           />
                         ) : (
diff --git a/client/src/components/__tests__/ToolsTab.test.tsx b/client/src/components/__tests__/ToolsTab.test.tsx
index c9f9b3152..dc353ba53 100644
--- a/client/src/components/__tests__/ToolsTab.test.tsx
+++ b/client/src/components/__tests__/ToolsTab.test.tsx
@@ -111,6 +111,27 @@ describe("ToolsTab", () => {
     });
   });
 
+  it("should allow typing negative numbers", async () => {
+    renderToolsTab({
+      selectedTool: mockTools[0],
+    });
+
+    const input = screen.getByRole("spinbutton") as HTMLInputElement;
+
+    // Complete the negative number
+    fireEvent.change(input, { target: { value: "-42" } });
+    expect(input.value).toBe("-42");
+
+    const submitButton = screen.getByRole("button", { name: /run tool/i });
+    await act(async () => {
+      fireEvent.click(submitButton);
+    });
+
+    expect(defaultProps.callTool).toHaveBeenCalledWith(mockTools[0].name, {
+      num: -42,
+    });
+  });
+
   it("should disable button and change text while tool is running", async () => {
     // Create a promise that we can resolve later
     let resolvePromise: ((value: unknown) => void) | undefined;