diff --git a/packages/angular/cli/src/commands/mcp/tools/devserver/devserver-start.ts b/packages/angular/cli/src/commands/mcp/tools/devserver/devserver-start.ts
index 4e2155f500b7..72bf5440adcb 100644
--- a/packages/angular/cli/src/commands/mcp/tools/devserver/devserver-start.ts
+++ b/packages/angular/cli/src/commands/mcp/tools/devserver/devserver-start.ts
@@ -119,7 +119,7 @@ the first build completes.
 * **Consistent Ports**: If making multiple calls, it is recommended to reuse the port you got from the first call for subsequent ones.
 </Operational Notes>
 `,
-  isReadOnly: true,
+  isReadOnly: false,
   isLocalOnly: true,
   inputSchema: devserverStartToolInputSchema.shape,
   outputSchema: devserverStartToolOutputSchema.shape,
diff --git a/packages/angular/cli/src/commands/mcp/tools/devserver/devserver-stop.ts b/packages/angular/cli/src/commands/mcp/tools/devserver/devserver-stop.ts
index 669160695194..32b7d90269d2 100644
--- a/packages/angular/cli/src/commands/mcp/tools/devserver/devserver-stop.ts
+++ b/packages/angular/cli/src/commands/mcp/tools/devserver/devserver-stop.ts
@@ -69,7 +69,7 @@ Stops a running Angular development server ("ng serve") that was started with th
   time after this is called. However note that this is not a blocker for starting a new devserver.
 </Operational Notes>
 `,
-  isReadOnly: true,
+  isReadOnly: false,
   isLocalOnly: true,
   inputSchema: devserverStopToolInputSchema.shape,
   outputSchema: devserverStopToolOutputSchema.shape,