Changes before error encountered

Co-authored-by: KSemenenko <4385716+KSemenenko@users.noreply.github.com>

Author: Copilot

CodexSharpSDK.Tests/Unit/CodexExecTests.cs

@@ -128,8 +128,8 @@ public async Task BuildCommandArgs_MapsExtendedCliFlags()
             Color = ExecOutputColor.Never,
             ProgressCursor = true,
             OutputLastMessageFile = "/tmp/last-message.txt",
-            EnabledFeatures = ["multi_agent", "unified_exec"],
-            DisabledFeatures = ["steer"],
+            EnabledFeatures = [CodexFeatureKeys.MultiAgent, CodexFeatureKeys.UnifiedExec],
+            DisabledFeatures = [CodexFeatureKeys.Steer],
             AdditionalCliArguments = ["--some-future-flag", "custom-value"],
         });
 
@@ -144,8 +144,8 @@ public async Task BuildCommandArgs_MapsExtendedCliFlags()
         await Assert.That(commandArgs.Contains("--ephemeral")).IsTrue();
         await Assert.That(commandArgs.Contains("--progress-cursor")).IsTrue();
 
-        await Assert.That(CollectFlagValues(commandArgs, "--enable")).IsEquivalentTo(["multi_agent", "unified_exec"]);
-        await Assert.That(CollectFlagValues(commandArgs, "--disable")).IsEquivalentTo(["steer"]);
+        await Assert.That(CollectFlagValues(commandArgs, "--enable")).IsEquivalentTo([CodexFeatureKeys.MultiAgent, CodexFeatureKeys.UnifiedExec]);
+        await Assert.That(CollectFlagValues(commandArgs, "--disable")).IsEquivalentTo([CodexFeatureKeys.Steer]);
 
         await Assert.That(commandArgs.Contains("--some-future-flag")).IsTrue();
         await Assert.That(commandArgs.Contains("custom-value")).IsTrue();

CodexSharpSDK.Tests/Unit/CodexFeatureKeysTests.cs

@@ -0,0 +1,46 @@
+using System.Reflection;
+using ManagedCode.CodexSharpSDK.Models;
+
+namespace ManagedCode.CodexSharpSDK.Tests.Unit;
+
+public class CodexFeatureKeysTests
+{
+    [Test]
+    public async Task ToolCallMcpElicitation_HasCorrectValue()
+    {
+        var key = CodexFeatureKeys.ToolCallMcpElicitation;
+        await Assert.That(key).IsEqualTo("tool_call_mcp_elicitation");
+    }
+
+    [Test]
+    public async Task AllFeatureKeys_AreNonEmptyStrings()
+    {
+        var keys = GetAllFeatureKeyValues();
+        foreach (var key in keys)
+        {
+            await Assert.That(string.IsNullOrWhiteSpace(key)).IsFalse();
+        }
+    }
+
+    [Test]
+    public async Task AllFeatureKeys_AreUnique()
+    {
+        var keys = GetAllFeatureKeyValues();
+        var duplicates = keys
+            .GroupBy(k => k, StringComparer.Ordinal)
+            .Where(g => g.Count() > 1)
+            .Select(g => g.Key)
+            .ToArray();
+
+        await Assert.That(duplicates).IsEmpty();
+    }
+
+    private static string[] GetAllFeatureKeyValues()
+    {
+        return typeof(CodexFeatureKeys)
+            .GetFields(BindingFlags.Public | BindingFlags.Static | BindingFlags.DeclaredOnly)
+            .Where(field => field is { IsLiteral: true, IsInitOnly: false, FieldType: not null } && field.FieldType == typeof(string))
+            .Select(field => (string)field.GetRawConstantValue()!)
+            .ToArray();
+    }
+}

CodexSharpSDK/Models/CodexFeatureKeys.cs

@@ -0,0 +1,54 @@
+namespace ManagedCode.CodexSharpSDK.Models;
+
+/// <summary>
+/// Known Codex CLI feature flag keys for use with <see cref="Client.ThreadOptions.EnabledFeatures"/>
+/// and <see cref="Client.ThreadOptions.DisabledFeatures"/>.
+/// Keys are sourced from <c>codex-rs/core/src/features.rs</c> in the upstream <c>openai/codex</c> repository.
+/// </summary>
+public static class CodexFeatureKeys
+{
+    public const string Undo = "undo";
+    public const string ShellTool = "shell_tool";
+    public const string UnifiedExec = "unified_exec";
+    public const string ShellZshFork = "shell_zsh_fork";
+    public const string ShellSnapshot = "shell_snapshot";
+    public const string JsRepl = "js_repl";
+    public const string JsReplToolsOnly = "js_repl_tools_only";
+    public const string WebSearchRequest = "web_search_request";
+    public const string WebSearchCached = "web_search_cached";
+    public const string SearchTool = "search_tool";
+    public const string CodexGitCommit = "codex_git_commit";
+    public const string RuntimeMetrics = "runtime_metrics";
+    public const string Sqlite = "sqlite";
+    public const string Memories = "memories";
+    public const string ChildAgentsMd = "child_agents_md";
+    public const string ImageDetailOriginal = "image_detail_original";
+    public const string ApplyPatchFreeform = "apply_patch_freeform";
+    public const string RequestPermissions = "request_permissions";
+    public const string UseLinuxSandboxBwrap = "use_linux_sandbox_bwrap";
+    public const string RequestRule = "request_rule";
+    public const string ExperimentalWindowsSandbox = "experimental_windows_sandbox";
+    public const string ElevatedWindowsSandbox = "elevated_windows_sandbox";
+    public const string RemoteModels = "remote_models";
+    public const string PowershellUtf8 = "powershell_utf8";
+    public const string EnableRequestCompression = "enable_request_compression";
+    public const string MultiAgent = "multi_agent";
+    public const string Apps = "apps";
+    public const string Plugins = "plugins";
+    public const string ImageGeneration = "image_generation";
+    public const string AppsMcpGateway = "apps_mcp_gateway";
+    public const string SkillMcpDependencyInstall = "skill_mcp_dependency_install";
+    public const string SkillEnvVarDependencyPrompt = "skill_env_var_dependency_prompt";
+    public const string Steer = "steer";
+    public const string DefaultModeRequestUserInput = "default_mode_request_user_input";
+    public const string CollaborationModes = "collaboration_modes";
+    public const string ToolCallMcpElicitation = "tool_call_mcp_elicitation";
+    public const string Personality = "personality";
+    public const string Artifact = "artifact";
+    public const string FastMode = "fast_mode";
+    public const string VoiceTranscription = "voice_transcription";
+    public const string RealtimeConversation = "realtime_conversation";
+    public const string PreventIdleSleep = "prevent_idle_sleep";
+    public const string ResponsesWebsockets = "responses_websockets";
+    public const string ResponsesWebsocketsV2 = "responses_websockets_v2";
+}