diff --git a/dotnet/src/webdriver/BiDi/BrowsingContext/BrowsingContextScriptModule.cs b/dotnet/src/webdriver/BiDi/BrowsingContext/BrowsingContextScriptModule.cs
index df91a3e893a2f..abebc16113d31 100644
--- a/dotnet/src/webdriver/BiDi/BrowsingContext/BrowsingContextScriptModule.cs
+++ b/dotnet/src/webdriver/BiDi/BrowsingContext/BrowsingContextScriptModule.cs
@@ -17,14 +17,16 @@
 // under the License.
 // </copyright>
 
-using System.Threading.Tasks;
 using OpenQA.Selenium.BiDi.Script;
+using OpenQA.Selenium.Internal;
+using System.Diagnostics.CodeAnalysis;
+using System.Threading.Tasks;
 
 namespace OpenQA.Selenium.BiDi.BrowsingContext;
 
 public sealed class BrowsingContextScriptModule(BrowsingContext context, ScriptModule scriptModule)
 {
-    public async Task<AddPreloadScriptResult> AddPreloadScriptAsync(string functionDeclaration, BrowsingContextAddPreloadScriptOptions? options = null)
+    public async Task<AddPreloadScriptResult> AddPreloadScriptAsync([StringSyntax(StringSyntaxConstants.JavaScript)] string functionDeclaration, BrowsingContextAddPreloadScriptOptions? options = null)
     {
         AddPreloadScriptOptions addPreloadScriptOptions = new(options)
         {
@@ -43,7 +45,7 @@ public async Task<GetRealmsResult> GetRealmsAsync(GetRealmsOptions? options = nu
         return await scriptModule.GetRealmsAsync(options).ConfigureAwait(false);
     }
 
-    public Task<EvaluateResult> EvaluateAsync(string expression, bool awaitPromise, EvaluateOptions? options = null, ContextTargetOptions? targetOptions = null)
+    public Task<EvaluateResult> EvaluateAsync([StringSyntax(StringSyntaxConstants.JavaScript)] string expression, bool awaitPromise, EvaluateOptions? options = null, ContextTargetOptions? targetOptions = null)
     {
         var contextTarget = new ContextTarget(context);
 
@@ -55,14 +57,14 @@ public Task<EvaluateResult> EvaluateAsync(string expression, bool awaitPromise,
         return scriptModule.EvaluateAsync(expression, awaitPromise, contextTarget, options);
     }
 
-    public async Task<TResult?> EvaluateAsync<TResult>(string expression, bool awaitPromise, EvaluateOptions? options = null, ContextTargetOptions? targetOptions = null)
+    public async Task<TResult?> EvaluateAsync<TResult>([StringSyntax(StringSyntaxConstants.JavaScript)] string expression, bool awaitPromise, EvaluateOptions? options = null, ContextTargetOptions? targetOptions = null)
     {
         var result = await EvaluateAsync(expression, awaitPromise, options, targetOptions).ConfigureAwait(false);
 
         return result.AsSuccessResult().ConvertTo<TResult>();
     }
 
-    public Task<EvaluateResult> CallFunctionAsync(string functionDeclaration, bool awaitPromise, CallFunctionOptions? options = null, ContextTargetOptions? targetOptions = null)
+    public Task<EvaluateResult> CallFunctionAsync([StringSyntax(StringSyntaxConstants.JavaScript)] string functionDeclaration, bool awaitPromise, CallFunctionOptions? options = null, ContextTargetOptions? targetOptions = null)
     {
         var contextTarget = new ContextTarget(context);
 
@@ -74,7 +76,7 @@ public Task<EvaluateResult> CallFunctionAsync(string functionDeclaration, bool a
         return scriptModule.CallFunctionAsync(functionDeclaration, awaitPromise, contextTarget, options);
     }
 
-    public async Task<TResult?> CallFunctionAsync<TResult>(string functionDeclaration, bool awaitPromise, CallFunctionOptions? options = null, ContextTargetOptions? targetOptions = null)
+    public async Task<TResult?> CallFunctionAsync<TResult>([StringSyntax(StringSyntaxConstants.JavaScript)] string functionDeclaration, bool awaitPromise, CallFunctionOptions? options = null, ContextTargetOptions? targetOptions = null)
     {
         var result = await CallFunctionAsync(functionDeclaration, awaitPromise, options, targetOptions).ConfigureAwait(false);
 
diff --git a/dotnet/src/webdriver/BiDi/Script/AddPreloadScriptCommand.cs b/dotnet/src/webdriver/BiDi/Script/AddPreloadScriptCommand.cs
index c676ea7b5600a..4cb6e75b0e7f5 100644
--- a/dotnet/src/webdriver/BiDi/Script/AddPreloadScriptCommand.cs
+++ b/dotnet/src/webdriver/BiDi/Script/AddPreloadScriptCommand.cs
@@ -17,14 +17,16 @@
 // under the License.
 // </copyright>
 
+using OpenQA.Selenium.Internal;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 
 namespace OpenQA.Selenium.BiDi.Script;
 
 internal sealed class AddPreloadScriptCommand(AddPreloadScriptParameters @params)
     : Command<AddPreloadScriptParameters, AddPreloadScriptResult>(@params, "script.addPreloadScript");
 
-internal sealed record AddPreloadScriptParameters(string FunctionDeclaration, IEnumerable<ChannelLocalValue>? Arguments, IEnumerable<BrowsingContext.BrowsingContext>? Contexts, string? Sandbox) : Parameters;
+internal sealed record AddPreloadScriptParameters([StringSyntax(StringSyntaxConstants.JavaScript)] string FunctionDeclaration, IEnumerable<ChannelLocalValue>? Arguments, IEnumerable<BrowsingContext.BrowsingContext>? Contexts, string? Sandbox) : Parameters;
 
 public sealed class AddPreloadScriptOptions : CommandOptions
 {
diff --git a/dotnet/src/webdriver/BiDi/Script/CallFunctionCommand.cs b/dotnet/src/webdriver/BiDi/Script/CallFunctionCommand.cs
index 2b2ea525466fa..41d8bcce8f2cd 100644
--- a/dotnet/src/webdriver/BiDi/Script/CallFunctionCommand.cs
+++ b/dotnet/src/webdriver/BiDi/Script/CallFunctionCommand.cs
@@ -17,14 +17,16 @@
 // under the License.
 // </copyright>
 
+using OpenQA.Selenium.Internal;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 
 namespace OpenQA.Selenium.BiDi.Script;
 
 internal sealed class CallFunctionCommand(CallFunctionParameters @params)
     : Command<CallFunctionParameters, EvaluateResult>(@params, "script.callFunction");
 
-internal sealed record CallFunctionParameters(string FunctionDeclaration, bool AwaitPromise, Target Target, IEnumerable<LocalValue>? Arguments, ResultOwnership? ResultOwnership, SerializationOptions? SerializationOptions, LocalValue? This, bool? UserActivation) : Parameters;
+internal sealed record CallFunctionParameters([StringSyntax(StringSyntaxConstants.JavaScript)] string FunctionDeclaration, bool AwaitPromise, Target Target, IEnumerable<LocalValue>? Arguments, ResultOwnership? ResultOwnership, SerializationOptions? SerializationOptions, LocalValue? This, bool? UserActivation) : Parameters;
 
 public sealed class CallFunctionOptions : CommandOptions
 {
diff --git a/dotnet/src/webdriver/BiDi/Script/EvaluateCommand.cs b/dotnet/src/webdriver/BiDi/Script/EvaluateCommand.cs
index 65d5ed6d8ca24..2b142ef59cdfd 100644
--- a/dotnet/src/webdriver/BiDi/Script/EvaluateCommand.cs
+++ b/dotnet/src/webdriver/BiDi/Script/EvaluateCommand.cs
@@ -18,7 +18,9 @@
 // </copyright>
 
 using OpenQA.Selenium.BiDi.Json.Converters.Polymorphic;
+using OpenQA.Selenium.Internal;
 using System;
+using System.Diagnostics.CodeAnalysis;
 using System.Text.Json.Serialization;
 
 namespace OpenQA.Selenium.BiDi.Script;
@@ -26,7 +28,7 @@ namespace OpenQA.Selenium.BiDi.Script;
 internal sealed class EvaluateCommand(EvaluateParameters @params)
     : Command<EvaluateParameters, EvaluateResult>(@params, "script.evaluate");
 
-internal sealed record EvaluateParameters(string Expression, Target Target, bool AwaitPromise, ResultOwnership? ResultOwnership, SerializationOptions? SerializationOptions, bool? UserActivation) : Parameters;
+internal sealed record EvaluateParameters([StringSyntax(StringSyntaxConstants.JavaScript)] string Expression, Target Target, bool AwaitPromise, ResultOwnership? ResultOwnership, SerializationOptions? SerializationOptions, bool? UserActivation) : Parameters;
 
 public sealed class EvaluateOptions : CommandOptions
 {
diff --git a/dotnet/src/webdriver/BiDi/Script/ScriptModule.cs b/dotnet/src/webdriver/BiDi/Script/ScriptModule.cs
index e13d907e47ec3..bd1354decc6e8 100644
--- a/dotnet/src/webdriver/BiDi/Script/ScriptModule.cs
+++ b/dotnet/src/webdriver/BiDi/Script/ScriptModule.cs
@@ -19,6 +19,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 using System.Threading.Tasks;
@@ -29,28 +30,28 @@ public sealed class ScriptModule : Module
 {
     private ScriptJsonSerializerContext _jsonContext = null!;
 
-    public async Task<EvaluateResult> EvaluateAsync(string expression, bool awaitPromise, Target target, EvaluateOptions? options = null)
+    public async Task<EvaluateResult> EvaluateAsync([StringSyntax(StringSyntaxConstants.JavaScript)] string expression, bool awaitPromise, Target target, EvaluateOptions? options = null)
     {
         var @params = new EvaluateParameters(expression, target, awaitPromise, options?.ResultOwnership, options?.SerializationOptions, options?.UserActivation);
 
         return await Broker.ExecuteCommandAsync(new EvaluateCommand(@params), options, _jsonContext.EvaluateCommand, _jsonContext.EvaluateResult).ConfigureAwait(false);
     }
 
-    public async Task<TResult?> EvaluateAsync<TResult>(string expression, bool awaitPromise, Target target, EvaluateOptions? options = null)
+    public async Task<TResult?> EvaluateAsync<TResult>([StringSyntax(StringSyntaxConstants.JavaScript)] string expression, bool awaitPromise, Target target, EvaluateOptions? options = null)
     {
         var result = await EvaluateAsync(expression, awaitPromise, target, options).ConfigureAwait(false);
 
         return result.AsSuccessResult().ConvertTo<TResult>();
     }
 
-    public async Task<EvaluateResult> CallFunctionAsync(string functionDeclaration, bool awaitPromise, Target target, CallFunctionOptions? options = null)
+    public async Task<EvaluateResult> CallFunctionAsync([StringSyntax(StringSyntaxConstants.JavaScript)] string functionDeclaration, bool awaitPromise, Target target, CallFunctionOptions? options = null)
     {
         var @params = new CallFunctionParameters(functionDeclaration, awaitPromise, target, options?.Arguments, options?.ResultOwnership, options?.SerializationOptions, options?.This, options?.UserActivation);
 
         return await Broker.ExecuteCommandAsync(new CallFunctionCommand(@params), options, _jsonContext.CallFunctionCommand, _jsonContext.EvaluateResult).ConfigureAwait(false);
     }
 
-    public async Task<TResult?> CallFunctionAsync<TResult>(string functionDeclaration, bool awaitPromise, Target target, CallFunctionOptions? options = null)
+    public async Task<TResult?> CallFunctionAsync<TResult>([StringSyntax(StringSyntaxConstants.JavaScript)] string functionDeclaration, bool awaitPromise, Target target, CallFunctionOptions? options = null)
     {
         var result = await CallFunctionAsync(functionDeclaration, awaitPromise, target, options).ConfigureAwait(false);
 
@@ -71,7 +72,7 @@ public async Task<GetRealmsResult> GetRealmsAsync(GetRealmsOptions? options = nu
         return await Broker.ExecuteCommandAsync(new GetRealmsCommand(@params), options, _jsonContext.GetRealmsCommand, _jsonContext.GetRealmsResult).ConfigureAwait(false);
     }
 
-    public async Task<AddPreloadScriptResult> AddPreloadScriptAsync(string functionDeclaration, AddPreloadScriptOptions? options = null)
+    public async Task<AddPreloadScriptResult> AddPreloadScriptAsync([StringSyntax(StringSyntaxConstants.JavaScript)] string functionDeclaration, AddPreloadScriptOptions? options = null)
     {
         var @params = new AddPreloadScriptParameters(functionDeclaration, options?.Arguments, options?.Contexts, options?.Sandbox);