Add Codex to autoconfig options (#288)

* feat: add Codex CLI client support with config.toml handling

* feat: add config helpers for managing Codex and MCP server configurations

* feat: add TOML array parsing support for multi-line and trailing comma formats

* fix: handle TOML inline comments in section headers during parsing

* fix: strip TOML comments before processing section headers

* fix: improve JSON parsing to handle escaped single quotes in config strings

* Use Tommy for TOML parsing

It's a single file and OSS, easy to integrate into Unity

* fix: patched Tommy’s literal-string handling so doubled single quotes inside literal strings are treated as embedded apostrophes instead of prematurely ending the value

* Don't overwrite MCP configs while testing

Seeing random JSON in my codex config was pretty annoying

* PR Feedback

* Keep Tommy compatible with Unity 2021

* Re-include Tommy's license

Probably a good habit to keep all 3rd party licenses and copyrights, even if they're also MIT licenses

TestProjects/UnityMCPTests/Assets/Tests/EditMode/Helpers.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: d539787bf8f6a426e94bfffb32a36d4f
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

TestProjects/UnityMCPTests/Assets/Tests/EditMode/Helpers/CodexConfigHelperTests.cs

@@ -0,0 +1,103 @@
+using NUnit.Framework;
+using MCPForUnity.Editor.Helpers;
+
+namespace MCPForUnityTests.Editor.Helpers
+{
+    public class CodexConfigHelperTests
+    {
+        [Test]
+        public void TryParseCodexServer_SingleLineArgs_ParsesSuccessfully()
+        {
+            string toml = string.Join("\n", new[]
+            {
+                "[mcp_servers.unityMCP]",
+                "command = \"uv\"",
+                "args = [\"run\", \"--directory\", \"/abs/path\", \"server.py\"]"
+            });
+
+            bool result = CodexConfigHelper.TryParseCodexServer(toml, out string command, out string[] args);
+
+            Assert.IsTrue(result, "Parser should detect server definition");
+            Assert.AreEqual("uv", command);
+            CollectionAssert.AreEqual(new[] { "run", "--directory", "/abs/path", "server.py" }, args);
+        }
+
+        [Test]
+        public void TryParseCodexServer_MultiLineArgsWithTrailingComma_ParsesSuccessfully()
+        {
+            string toml = string.Join("\n", new[]
+            {
+                "[mcp_servers.unityMCP]",
+                "command = \"uv\"",
+                "args = [",
+                "  \"run\",",
+                "  \"--directory\",",
+                "  \"/abs/path\",",
+                "  \"server.py\",",
+                "]"
+            });
+
+            bool result = CodexConfigHelper.TryParseCodexServer(toml, out string command, out string[] args);
+
+            Assert.IsTrue(result, "Parser should handle multi-line arrays with trailing comma");
+            Assert.AreEqual("uv", command);
+            CollectionAssert.AreEqual(new[] { "run", "--directory", "/abs/path", "server.py" }, args);
+        }
+
+        [Test]
+        public void TryParseCodexServer_MultiLineArgsWithComments_IgnoresComments()
+        {
+            string toml = string.Join("\n", new[]
+            {
+                "[mcp_servers.unityMCP]",
+                "command = \"uv\"",
+                "args = [",
+                "  \"run\", # launch command",
+                "  \"--directory\",",
+                "  \"/abs/path\",",
+                "  \"server.py\"",
+                "]"
+            });
+
+            bool result = CodexConfigHelper.TryParseCodexServer(toml, out string command, out string[] args);
+
+            Assert.IsTrue(result, "Parser should tolerate comments within the array block");
+            Assert.AreEqual("uv", command);
+            CollectionAssert.AreEqual(new[] { "run", "--directory", "/abs/path", "server.py" }, args);
+        }
+
+        [Test]
+        public void TryParseCodexServer_HeaderWithComment_StillDetected()
+        {
+            string toml = string.Join("\n", new[]
+            {
+                "[mcp_servers.unityMCP] # annotated header",
+                "command = \"uv\"",
+                "args = [\"run\", \"--directory\", \"/abs/path\", \"server.py\"]"
+            });
+
+            bool result = CodexConfigHelper.TryParseCodexServer(toml, out string command, out string[] args);
+
+            Assert.IsTrue(result, "Parser should recognize section headers even with inline comments");
+            Assert.AreEqual("uv", command);
+            CollectionAssert.AreEqual(new[] { "run", "--directory", "/abs/path", "server.py" }, args);
+        }
+
+        [Test]
+        public void TryParseCodexServer_SingleQuotedArgsWithApostrophes_ParsesSuccessfully()
+        {
+            string toml = string.Join("\n", new[]
+            {
+                "[mcp_servers.unityMCP]",
+                "command = 'uv'",
+                "args = ['run', '--directory', '/Users/O''Connor/codex', 'server.py']"
+            });
+
+            bool result = CodexConfigHelper.TryParseCodexServer(toml, out string command, out string[] args);
+
+            Assert.IsTrue(result, "Parser should accept single-quoted arrays with escaped apostrophes");
+            Assert.AreEqual("uv", command);
+            CollectionAssert.AreEqual(new[] { "run", "--directory", "/Users/O'Connor/codex", "server.py" }, args);
+        }
+    }
+}

TestProjects/UnityMCPTests/Assets/Tests/EditMode/Helpers/CodexConfigHelperTests.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 013424dea29744a98b3dc01618f4e95e
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

TestProjects/UnityMCPTests/Assets/Tests/EditMode/Windows/WriteToConfigTests.cs

@@ -46,6 +46,8 @@ namespace MCPForUnityTests.Editor.Windows
             EditorPrefs.SetString("MCPForUnity.ServerSrc", _serverSrcDir);
             // Ensure no lock is enabled
             EditorPrefs.SetBool("MCPForUnity.LockCursorConfig", false);
+            // Disable auto-registration to avoid hitting user configs during tests
+            EditorPrefs.SetBool("MCPForUnity.AutoRegisterEnabled", false);
         }
 
         [TearDown]
@@ -54,6 +56,7 @@ namespace MCPForUnityTests.Editor.Windows
             // Clean up editor preferences set during SetUp
             EditorPrefs.DeleteKey("MCPForUnity.ServerSrc");
             EditorPrefs.DeleteKey("MCPForUnity.LockCursorConfig");
+            EditorPrefs.DeleteKey("MCPForUnity.AutoRegisterEnabled");
 
             // Remove temp files
             try { if (Directory.Exists(_tempRoot)) Directory.Delete(_tempRoot, true); } catch { }

UnityMcpBridge/Editor/Data/McpClients.cs

@@ -159,6 +159,28 @@ namespace MCPForUnity.Editor.Data
                 mcpType = McpTypes.Kiro,
                 configStatus = "Not Configured",
             },
+            // 4) Codex CLI
+            new()
+            {
+                name = "Codex CLI",
+                windowsConfigPath = Path.Combine(
+                    Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
+                    ".codex",
+                    "config.toml"
+                ),
+                macConfigPath = Path.Combine(
+                    Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
+                    ".codex",
+                    "config.toml"
+                ),
+                linuxConfigPath = Path.Combine(
+                    Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
+                    ".codex",
+                    "config.toml"
+                ),
+                mcpType = McpTypes.Codex,
+                configStatus = "Not Configured",
+            },
         };
 
         // Initialize status enums after construction
@@ -174,4 +196,3 @@ namespace MCPForUnity.Editor.Data
         }
     }
 }
-

UnityMcpBridge/Editor/External.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: c11944bcfb9ec4576bab52874b7df584
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

UnityMcpBridge/Editor/External/Tommy.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: ea652131dcdaa44ca8cb35cd1191be3f
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

UnityMcpBridge/Editor/Helpers/CodexConfigHelper.cs

@@ -0,0 +1,243 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using MCPForUnity.External.Tommy;
+using Newtonsoft.Json;
+
+namespace MCPForUnity.Editor.Helpers
+{
+    /// <summary>
+    /// Codex CLI specific configuration helpers. Handles TOML snippet
+    /// generation and lightweight parsing so Codex can join the auto-setup
+    /// flow alongside JSON-based clients.
+    /// </summary>
+    public static class CodexConfigHelper
+    {
+        public static bool IsCodexConfigured(string pythonDir)
+        {
+            try
+            {
+                string basePath = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
+                if (string.IsNullOrEmpty(basePath)) return false;
+
+                string configPath = Path.Combine(basePath, ".codex", "config.toml");
+                if (!File.Exists(configPath)) return false;
+
+                string toml = File.ReadAllText(configPath);
+                if (!TryParseCodexServer(toml, out _, out var args)) return false;
+
+                string dir = McpConfigFileHelper.ExtractDirectoryArg(args);
+                if (string.IsNullOrEmpty(dir)) return false;
+
+                return McpConfigFileHelper.PathsEqual(dir, pythonDir);
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        public static string BuildCodexServerBlock(string uvPath, string serverSrc)
+        {
+            string argsArray = FormatTomlStringArray(new[] { "run", "--directory", serverSrc, "server.py" });
+            return $"[mcp_servers.unityMCP]{Environment.NewLine}" +
+                   $"command = \"{EscapeTomlString(uvPath)}\"{Environment.NewLine}" +
+                   $"args = {argsArray}";
+        }
+
+        public static string UpsertCodexServerBlock(string existingToml, string newBlock)
+        {
+            if (string.IsNullOrWhiteSpace(existingToml))
+            {
+                return newBlock.TrimEnd() + Environment.NewLine;
+            }
+
+            StringBuilder sb = new StringBuilder();
+            using StringReader reader = new StringReader(existingToml);
+            string line;
+            bool inTarget = false;
+            bool replaced = false;
+            while ((line = reader.ReadLine()) != null)
+            {
+                string trimmed = line.Trim();
+                bool isSection = trimmed.StartsWith("[") && trimmed.EndsWith("]") && !trimmed.StartsWith("[[");
+                if (isSection)
+                {
+                    bool isTarget = string.Equals(trimmed, "[mcp_servers.unityMCP]", StringComparison.OrdinalIgnoreCase);
+                    if (isTarget)
+                    {
+                        if (!replaced)
+                        {
+                            if (sb.Length > 0 && sb[^1] != '\n') sb.AppendLine();
+                            sb.AppendLine(newBlock.TrimEnd());
+                            replaced = true;
+                        }
+                        inTarget = true;
+                        continue;
+                    }
+
+                    if (inTarget)
+                    {
+                        inTarget = false;
+                    }
+                }
+
+                if (inTarget)
+                {
+                    continue;
+                }
+
+                sb.AppendLine(line);
+            }
+
+            if (!replaced)
+            {
+                if (sb.Length > 0 && sb[^1] != '\n') sb.AppendLine();
+                sb.AppendLine(newBlock.TrimEnd());
+            }
+
+            return sb.ToString().TrimEnd() + Environment.NewLine;
+        }
+
+        public static bool TryParseCodexServer(string toml, out string command, out string[] args)
+        {
+            command = null;
+            args = null;
+            if (string.IsNullOrWhiteSpace(toml)) return false;
+
+            try
+            {
+                using var reader = new StringReader(toml);
+                TomlTable root = TOML.Parse(reader);
+                if (root == null) return false;
+
+                if (!TryGetTable(root, "mcp_servers", out var servers)
+                    && !TryGetTable(root, "mcpServers", out servers))
+                {
+                    return false;
+                }
+
+                if (!TryGetTable(servers, "unityMCP", out var unity))
+                {
+                    return false;
+                }
+
+                command = GetTomlString(unity, "command");
+                args = GetTomlStringArray(unity, "args");
+
+                return !string.IsNullOrEmpty(command) && args != null;
+            }
+            catch (TomlParseException)
+            {
+                return false;
+            }
+            catch (TomlSyntaxException)
+            {
+                return false;
+            }
+            catch (FormatException)
+            {
+                return false;
+            }
+        }
+
+        private static bool TryGetTable(TomlTable parent, string key, out TomlTable table)
+        {
+            table = null;
+            if (parent == null) return false;
+
+            if (parent.TryGetNode(key, out var node))
+            {
+                if (node is TomlTable tbl)
+                {
+                    table = tbl;
+                    return true;
+                }
+
+                if (node is TomlArray array)
+                {
+                    var firstTable = array.Children.OfType<TomlTable>().FirstOrDefault();
+                    if (firstTable != null)
+                    {
+                        table = firstTable;
+                        return true;
+                    }
+                }
+            }
+
+            return false;
+        }
+
+        private static string GetTomlString(TomlTable table, string key)
+        {
+            if (table != null && table.TryGetNode(key, out var node))
+            {
+                if (node is TomlString str) return str.Value;
+                if (node.HasValue) return node.ToString();
+            }
+            return null;
+        }
+
+        private static string[] GetTomlStringArray(TomlTable table, string key)
+        {
+            if (table == null) return null;
+            if (!table.TryGetNode(key, out var node)) return null;
+
+            if (node is TomlArray array)
+            {
+                List<string> values = new List<string>();
+                foreach (TomlNode element in array.Children)
+                {
+                    if (element is TomlString str)
+                    {
+                        values.Add(str.Value);
+                    }
+                    else if (element.HasValue)
+                    {
+                        values.Add(element.ToString());
+                    }
+                }
+
+                return values.Count > 0 ? values.ToArray() : Array.Empty<string>();
+            }
+
+            if (node is TomlString single)
+            {
+                return new[] { single.Value };
+            }
+
+            return null;
+        }
+
+        private static string FormatTomlStringArray(IEnumerable<string> values)
+        {
+            if (values == null) return "[]";
+            StringBuilder sb = new StringBuilder();
+            sb.Append('[');
+            bool first = true;
+            foreach (string value in values)
+            {
+                if (!first)
+                {
+                    sb.Append(", ");
+                }
+                sb.Append('"').Append(EscapeTomlString(value ?? string.Empty)).Append('"');
+                first = false;
+            }
+            sb.Append(']');
+            return sb.ToString();
+        }
+
+        private static string EscapeTomlString(string value)
+        {
+            if (string.IsNullOrEmpty(value)) return string.Empty;
+            return value
+                .Replace("\\", "\\\\")
+                .Replace("\"", "\\\"");
+        }
+
+    }
+}

UnityMcpBridge/Editor/Helpers/CodexConfigHelper.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: b3e68082ffc0b4cd39d3747673a4cc22
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

UnityMcpBridge/Editor/Helpers/McpConfigFileHelper.cs

@@ -0,0 +1,187 @@
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+using System.Text;
+using UnityEditor;
+
+namespace MCPForUnity.Editor.Helpers
+{
+    /// <summary>
+    /// Shared helpers for reading and writing MCP client configuration files.
+    /// Consolidates file atomics and server directory resolution so the editor
+    /// window can focus on UI concerns only.
+    /// </summary>
+    public static class McpConfigFileHelper
+    {
+        public static string ExtractDirectoryArg(string[] args)
+        {
+            if (args == null) return null;
+            for (int i = 0; i < args.Length - 1; i++)
+            {
+                if (string.Equals(args[i], "--directory", StringComparison.OrdinalIgnoreCase))
+                {
+                    return args[i + 1];
+                }
+            }
+            return null;
+        }
+
+        public static bool PathsEqual(string a, string b)
+        {
+            if (string.IsNullOrEmpty(a) || string.IsNullOrEmpty(b)) return false;
+            try
+            {
+                string na = Path.GetFullPath(a.Trim());
+                string nb = Path.GetFullPath(b.Trim());
+                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+                {
+                    return string.Equals(na, nb, StringComparison.OrdinalIgnoreCase);
+                }
+                return string.Equals(na, nb, StringComparison.Ordinal);
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// Resolves the server directory to use for MCP tools, preferring
+        /// existing config values and falling back to installed/embedded copies.
+        /// </summary>
+        public static string ResolveServerDirectory(string pythonDir, string[] existingArgs)
+        {
+            string serverSrc = ExtractDirectoryArg(existingArgs);
+            bool serverValid = !string.IsNullOrEmpty(serverSrc)
+                && File.Exists(Path.Combine(serverSrc, "server.py"));
+            if (!serverValid)
+            {
+                if (!string.IsNullOrEmpty(pythonDir)
+                    && File.Exists(Path.Combine(pythonDir, "server.py")))
+                {
+                    serverSrc = pythonDir;
+                }
+                else
+                {
+                    serverSrc = ResolveServerSource();
+                }
+            }
+
+            try
+            {
+                if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX) && !string.IsNullOrEmpty(serverSrc))
+                {
+                    string norm = serverSrc.Replace('\\', '/');
+                    int idx = norm.IndexOf("/.local/share/UnityMCP/", StringComparison.Ordinal);
+                    if (idx >= 0)
+                    {
+                        string home = Environment.GetFolderPath(Environment.SpecialFolder.Personal) ?? string.Empty;
+                        string suffix = norm.Substring(idx + "/.local/share/".Length);
+                        serverSrc = Path.Combine(home, "Library", "Application Support", suffix);
+                    }
+                }
+            }
+            catch
+            {
+                // Ignore failures and fall back to the original path.
+            }
+
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows)
+                && !string.IsNullOrEmpty(serverSrc)
+                && serverSrc.IndexOf(@"\Library\PackageCache\", StringComparison.OrdinalIgnoreCase) >= 0
+                && !EditorPrefs.GetBool("MCPForUnity.UseEmbeddedServer", false))
+            {
+                serverSrc = ServerInstaller.GetServerPath();
+            }
+
+            return serverSrc;
+        }
+
+        public static void WriteAtomicFile(string path, string contents)
+        {
+            string tmp = path + ".tmp";
+            string backup = path + ".backup";
+            bool writeDone = false;
+            try
+            {
+                File.WriteAllText(tmp, contents, new UTF8Encoding(false));
+                try
+                {
+                    File.Replace(tmp, path, backup);
+                    writeDone = true;
+                }
+                catch (FileNotFoundException)
+                {
+                    File.Move(tmp, path);
+                    writeDone = true;
+                }
+                catch (PlatformNotSupportedException)
+                {
+                    if (File.Exists(path))
+                    {
+                        try
+                        {
+                            if (File.Exists(backup)) File.Delete(backup);
+                        }
+                        catch { }
+                        File.Move(path, backup);
+                    }
+                    File.Move(tmp, path);
+                    writeDone = true;
+                }
+            }
+            catch (Exception ex)
+            {
+                try
+                {
+                    if (!writeDone && File.Exists(backup))
+                    {
+                        try { File.Copy(backup, path, true); } catch { }
+                    }
+                }
+                catch { }
+                throw new Exception($"Failed to write config file '{path}': {ex.Message}", ex);
+            }
+            finally
+            {
+                try { if (File.Exists(tmp)) File.Delete(tmp); } catch { }
+                try { if (writeDone && File.Exists(backup)) File.Delete(backup); } catch { }
+            }
+        }
+
+        public static string ResolveServerSource()
+        {
+            try
+            {
+                string remembered = EditorPrefs.GetString("MCPForUnity.ServerSrc", string.Empty);
+                if (!string.IsNullOrEmpty(remembered)
+                    && File.Exists(Path.Combine(remembered, "server.py")))
+                {
+                    return remembered;
+                }
+
+                ServerInstaller.EnsureServerInstalled();
+                string installed = ServerInstaller.GetServerPath();
+                if (File.Exists(Path.Combine(installed, "server.py")))
+                {
+                    return installed;
+                }
+
+                bool useEmbedded = EditorPrefs.GetBool("MCPForUnity.UseEmbeddedServer", false);
+                if (useEmbedded
+                    && ServerPathResolver.TryFindEmbeddedServerSource(out string embedded)
+                    && File.Exists(Path.Combine(embedded, "server.py")))
+                {
+                    return embedded;
+                }
+
+                return installed;
+            }
+            catch
+            {
+                return ServerInstaller.GetServerPath();
+            }
+        }
+    }
+}
+

UnityMcpBridge/Editor/Helpers/McpConfigFileHelper.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: f69ad468942b74c0ea24e3e8e5f21a4b
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

UnityMcpBridge/Editor/Models/McpTypes.cs

@@ -4,10 +4,10 @@ namespace MCPForUnity.Editor.Models
     {
         ClaudeCode,
         ClaudeDesktop,
+        Codex,
         Cursor,
+        Kiro,
         VSCode,
         Windsurf,
-        Kiro,
     }
 }
-

UnityMcpBridge/Editor/Windows/MCPForUnityEditorWindow.cs

@@ -568,8 +568,9 @@ namespace MCPForUnity.Editor.Windows
                             }
                             else
                             {
-                                // For Cursor/others, skip if already configured
-                                if (!IsCursorConfigured(pythonDir))
+                                CheckMcpConfiguration(client);
+                                bool alreadyConfigured = client.status == McpStatus.Configured;
+                                if (!alreadyConfigured)
                                 {
                                     ConfigureMcpClient(client);
                                     anyRegistered = true;
@@ -581,7 +582,10 @@ namespace MCPForUnity.Editor.Windows
                             MCPForUnity.Editor.Helpers.McpLog.Warn($"Auto-setup client '{client.name}' failed: {ex.Message}");
                         }
                     }
-                    lastClientRegisteredOk = anyRegistered || IsCursorConfigured(pythonDir) || IsClaudeConfigured();
+					lastClientRegisteredOk = anyRegistered
+						|| IsCursorConfigured(pythonDir)
+						|| CodexConfigHelper.IsCodexConfigured(pythonDir)
+						|| IsClaudeConfigured();
                 }
 
                 // Ensure the bridge is listening and has a fresh saved port
@@ -658,7 +662,9 @@ namespace MCPForUnity.Editor.Windows
                         }
                         else
                         {
-                            if (!IsCursorConfigured(pythonDir))
+                            CheckMcpConfiguration(client);
+                            bool alreadyConfigured = client.status == McpStatus.Configured;
+                            if (!alreadyConfigured)
                             {
                                 ConfigureMcpClient(client);
                                 anyRegistered = true;
@@ -670,7 +676,10 @@ namespace MCPForUnity.Editor.Windows
                         UnityEngine.Debug.LogWarning($"Setup client '{client.name}' failed: {ex.Message}");
                     }
                 }
-                lastClientRegisteredOk = anyRegistered || IsCursorConfigured(pythonDir) || IsClaudeConfigured();
+				lastClientRegisteredOk = anyRegistered
+					|| IsCursorConfigured(pythonDir)
+					|| CodexConfigHelper.IsCodexConfigured(pythonDir)
+					|| IsClaudeConfigured();
 
                 // Restart/ensure bridge
                 MCPForUnityBridge.StartAutoConnect();
@@ -686,11 +695,11 @@ namespace MCPForUnity.Editor.Windows
             }
         }
 
-        private static bool IsCursorConfigured(string pythonDir)
-        {
-            try
-            {
-                string configPath = RuntimeInformation.IsOSPlatform(OSPlatform.Windows)
+		private static bool IsCursorConfigured(string pythonDir)
+		{
+			try
+			{
+				string configPath = RuntimeInformation.IsOSPlatform(OSPlatform.Windows)
                     ? Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), 
                         ".cursor", "mcp.json")
                     : Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), 
@@ -708,24 +717,9 @@ namespace MCPForUnity.Editor.Windows
                 string[] strArgs = ((System.Collections.Generic.IEnumerable<object>)args)
                     .Select(x => x?.ToString() ?? string.Empty)
                     .ToArray();
-                string dir = ExtractDirectoryArg(strArgs);
+                string dir = McpConfigFileHelper.ExtractDirectoryArg(strArgs);
                 if (string.IsNullOrEmpty(dir)) return false;
-                return PathsEqual(dir, pythonDir);
-            }
-            catch { return false; }
-        }
-
-        private static bool PathsEqual(string a, string b)
-        {
-            if (string.IsNullOrEmpty(a) || string.IsNullOrEmpty(b)) return false;
-            try
-            {
-                string na = System.IO.Path.GetFullPath(a.Trim());
-                string nb = System.IO.Path.GetFullPath(b.Trim());
-                if (System.Runtime.InteropServices.RuntimeInformation.IsOSPlatform(System.Runtime.InteropServices.OSPlatform.Windows))
-                    return string.Equals(na, nb, StringComparison.OrdinalIgnoreCase);
-                // Default to ordinal on Unix; optionally detect FS case-sensitivity at runtime if needed
-                return string.Equals(na, nb, StringComparison.Ordinal);
+                return McpConfigFileHelper.PathsEqual(dir, pythonDir);
             }
             catch { return false; }
         }
@@ -1136,19 +1130,6 @@ namespace MCPForUnity.Editor.Windows
 			catch { return false; }
 		}
 
-		private static string ExtractDirectoryArg(string[] args)
-		{
-			if (args == null) return null;
-			for (int i = 0; i < args.Length - 1; i++)
-			{
-				if (string.Equals(args[i], "--directory", StringComparison.OrdinalIgnoreCase))
-				{
-					return args[i + 1];
-				}
-			}
-			return null;
-		}
-
 		private static bool ArgsEqual(string[] a, string[] b)
 		{
 			if (a == null || b == null) return a == b;
@@ -1236,48 +1217,7 @@ namespace MCPForUnity.Editor.Windows
 			}
 			catch { }
 			if (uvPath == null) return "UV package manager not found. Please install UV first.";
-			string serverSrc = ExtractDirectoryArg(existingArgs);
-			bool serverValid = !string.IsNullOrEmpty(serverSrc)
-				&& System.IO.File.Exists(System.IO.Path.Combine(serverSrc, "server.py"));
-			if (!serverValid)
-			{
-				// Prefer the provided pythonDir if valid; fall back to resolver
-				if (!string.IsNullOrEmpty(pythonDir) && System.IO.File.Exists(System.IO.Path.Combine(pythonDir, "server.py")))
-				{
-					serverSrc = pythonDir;
-				}
-				else
-				{
-					serverSrc = ResolveServerSrc();
-				}
-			}
-
-			// macOS normalization: map XDG-style ~/.local/share to canonical Application Support
-			try
-			{
-				if (System.Runtime.InteropServices.RuntimeInformation.IsOSPlatform(System.Runtime.InteropServices.OSPlatform.OSX)
-					&& !string.IsNullOrEmpty(serverSrc))
-				{
-					string norm = serverSrc.Replace('\\', '/');
-					int idx = norm.IndexOf("/.local/share/UnityMCP/", StringComparison.Ordinal);
-					if (idx >= 0)
-					{
-						string home = Environment.GetFolderPath(Environment.SpecialFolder.Personal) ?? string.Empty;
-						string suffix = norm.Substring(idx + "/.local/share/".Length); // UnityMCP/...
-						serverSrc = System.IO.Path.Combine(home, "Library", "Application Support", suffix);
-					}
-				}
-			}
-			catch { }
-
-			// Hard-block PackageCache on Windows unless dev override is set
-			if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows)
-				&& !string.IsNullOrEmpty(serverSrc)
-				&& serverSrc.IndexOf(@"\Library\PackageCache\", StringComparison.OrdinalIgnoreCase) >= 0
-				&& !UnityEditor.EditorPrefs.GetBool("MCPForUnity.UseEmbeddedServer", false))
-			{
-				serverSrc = ServerInstaller.GetServerPath();
-			}
+			string serverSrc = McpConfigFileHelper.ResolveServerDirectory(pythonDir, existingArgs);
 
 			// 2) Canonical args order
 			var newArgs = new[] { "run", "--directory", serverSrc, "server.py" };
@@ -1301,60 +1241,7 @@ namespace MCPForUnity.Editor.Windows
 
 			string mergedJson = JsonConvert.SerializeObject(existingRoot, jsonSettings);
 			
-			// Robust atomic write without redundant backup or race on existence
-			string tmp = configPath + ".tmp";
-			string backup = configPath + ".backup";
-			bool writeDone = false;
-			try
-			{
-				// Write to temp file first (in same directory for atomicity)
-				System.IO.File.WriteAllText(tmp, mergedJson, new System.Text.UTF8Encoding(false));
-
-				try
-				{
-					// Try atomic replace; creates 'backup' only on success (platform-dependent)
-					System.IO.File.Replace(tmp, configPath, backup);
-					writeDone = true;
-				}
-				catch (System.IO.FileNotFoundException)
-				{
-					// Destination didn't exist; fall back to move
-					System.IO.File.Move(tmp, configPath);
-                    writeDone = true;
-				}
-				catch (System.PlatformNotSupportedException)
-				{
-					// Fallback: rename existing to backup, then move tmp into place
-					if (System.IO.File.Exists(configPath))
-					{
-						try { if (System.IO.File.Exists(backup)) System.IO.File.Delete(backup); } catch { }
-						System.IO.File.Move(configPath, backup);
-					}
-					System.IO.File.Move(tmp, configPath);
-					writeDone = true;
-				}
-			}
-			catch (Exception ex)
-			{
-
-				// If write did not complete, attempt restore from backup without deleting current file first
-				try
-				{
-					if (!writeDone && System.IO.File.Exists(backup))
-					{
-						try { System.IO.File.Copy(backup, configPath, true); } catch { }
-					}
-				}
-				catch { }
-				throw new Exception($"Failed to write config file '{configPath}': {ex.Message}", ex);
-			}
-			finally
-			{
-				// Best-effort cleanup of temp
-				try { if (System.IO.File.Exists(tmp)) System.IO.File.Delete(tmp); } catch { }
-				// Only remove backup after a confirmed successful write
-				try { if (writeDone && System.IO.File.Exists(backup)) System.IO.File.Delete(backup); } catch { }
-			}
+			McpConfigFileHelper.WriteAtomicFile(configPath, mergedJson);
 
 			try
 			{
@@ -1377,54 +1264,27 @@ namespace MCPForUnity.Editor.Windows
         }
 
         // New method to show manual instructions without changing status
-        private void ShowManualInstructionsWindow(string configPath, McpClient mcpClient)
-        {
-            // Get the Python directory path using Package Manager API
-            string pythonDir = FindPackagePythonDirectory();
-            // Build manual JSON centrally using the shared builder
-            string uvPathForManual = FindUvPath();
-            if (uvPathForManual == null)
-            {
-                UnityEngine.Debug.LogError("UV package manager not found. Cannot generate manual configuration.");
-                return;
-            }
-
-            string manualConfigJson = ConfigJsonBuilder.BuildManualConfigJson(uvPathForManual, pythonDir, mcpClient);
-            ManualConfigEditorWindow.ShowWindow(configPath, manualConfigJson, mcpClient);
-        }
-
-		private static string ResolveServerSrc()
+		private void ShowManualInstructionsWindow(string configPath, McpClient mcpClient)
 		{
-			try
+			// Get the Python directory path using Package Manager API
+			string pythonDir = FindPackagePythonDirectory();
+			// Build manual JSON centrally using the shared builder
+			string uvPathForManual = FindUvPath();
+			if (uvPathForManual == null)
 			{
-				string remembered = UnityEditor.EditorPrefs.GetString("MCPForUnity.ServerSrc", string.Empty);
-				if (!string.IsNullOrEmpty(remembered) && File.Exists(Path.Combine(remembered, "server.py")))
-				{
-					return remembered;
-				}
-
-				ServerInstaller.EnsureServerInstalled();
-				string installed = ServerInstaller.GetServerPath();
-				if (File.Exists(Path.Combine(installed, "server.py")))
-				{
-					return installed;
-				}
-
-				bool useEmbedded = UnityEditor.EditorPrefs.GetBool("MCPForUnity.UseEmbeddedServer", false);
-				if (useEmbedded && ServerPathResolver.TryFindEmbeddedServerSource(out string embedded)
-					&& File.Exists(Path.Combine(embedded, "server.py")))
-				{
-					return embedded;
-				}
-
-				return installed;
+				UnityEngine.Debug.LogError("UV package manager not found. Cannot generate manual configuration.");
+				return;
 			}
-			catch { return ServerInstaller.GetServerPath(); }
+
+			string manualConfig = mcpClient?.mcpType == McpTypes.Codex
+				? CodexConfigHelper.BuildCodexServerBlock(uvPathForManual, McpConfigFileHelper.ResolveServerDirectory(pythonDir, null)).TrimEnd() + Environment.NewLine
+				: ConfigJsonBuilder.BuildManualConfigJson(uvPathForManual, pythonDir, mcpClient);
+			ManualConfigEditorWindow.ShowWindow(configPath, manualConfig, mcpClient);
 		}
 
-		private string FindPackagePythonDirectory()
+        private string FindPackagePythonDirectory()
         {
-			string pythonDir = ResolveServerSrc();
+            string pythonDir = McpConfigFileHelper.ResolveServerSource();
 
             try
             {
@@ -1508,12 +1368,12 @@ namespace MCPForUnity.Editor.Windows
             }
         }
 
-        private string ConfigureMcpClient(McpClient mcpClient)
-        {
-            try
-            {
-                // Determine the config file path based on OS
-                string configPath;
+		private string ConfigureMcpClient(McpClient mcpClient)
+		{
+			try
+			{
+				// Determine the config file path based on OS
+				string configPath;
 
                 if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                 {
@@ -1541,21 +1401,23 @@ namespace MCPForUnity.Editor.Windows
                 // Create directory if it doesn't exist
                 Directory.CreateDirectory(Path.GetDirectoryName(configPath));
 
-                // Find the server.py file location using the same logic as FindPackagePythonDirectory
-                string pythonDir = FindPackagePythonDirectory();
+				// Find the server.py file location using the same logic as FindPackagePythonDirectory
+				string pythonDir = FindPackagePythonDirectory();
 
-                if (pythonDir == null || !File.Exists(Path.Combine(pythonDir, "server.py")))
-                {
-                    ShowManualInstructionsWindow(configPath, mcpClient);
-                    return "Manual Configuration Required";
-                }
+				if (pythonDir == null || !File.Exists(Path.Combine(pythonDir, "server.py")))
+				{
+					ShowManualInstructionsWindow(configPath, mcpClient);
+					return "Manual Configuration Required";
+				}
 
-                string result = WriteToConfig(pythonDir, configPath, mcpClient);
+				string result = mcpClient.mcpType == McpTypes.Codex
+					? ConfigureCodexClient(pythonDir, configPath, mcpClient)
+					: WriteToConfig(pythonDir, configPath, mcpClient);
 
-                // Update the client status after successful configuration
-                if (result == "Configured successfully")
-                {
-                    mcpClient.SetStatus(McpStatus.Configured);
+				// Update the client status after successful configuration
+				if (result == "Configured successfully")
+				{
+					mcpClient.SetStatus(McpStatus.Configured);
                 }
 
                 return result;
@@ -1588,8 +1450,82 @@ namespace MCPForUnity.Editor.Windows
                     $"Failed to configure {mcpClient.name}: {e.Message}\n{e.StackTrace}"
                 );
                 return $"Failed to configure {mcpClient.name}";
-            }
-        }
+			}
+		}
+
+		private string ConfigureCodexClient(string pythonDir, string configPath, McpClient mcpClient)
+		{
+			try { if (EditorPrefs.GetBool("MCPForUnity.LockCursorConfig", false)) return "Skipped (locked)"; } catch { }
+
+			string existingToml = string.Empty;
+			if (File.Exists(configPath))
+			{
+				try
+				{
+					existingToml = File.ReadAllText(configPath);
+				}
+				catch (Exception e)
+				{
+					if (debugLogsEnabled)
+					{
+						UnityEngine.Debug.LogWarning($"UnityMCP: Failed to read Codex config '{configPath}': {e.Message}");
+					}
+					existingToml = string.Empty;
+				}
+			}
+
+			string existingCommand = null;
+			string[] existingArgs = null;
+			if (!string.IsNullOrWhiteSpace(existingToml))
+			{
+				CodexConfigHelper.TryParseCodexServer(existingToml, out existingCommand, out existingArgs);
+			}
+
+			string uvPath = ServerInstaller.FindUvPath();
+			try
+			{
+				var name = Path.GetFileName((existingCommand ?? string.Empty).Trim()).ToLowerInvariant();
+				if ((name == "uv" || name == "uv.exe") && ValidateUvBinarySafe(existingCommand))
+				{
+					uvPath = existingCommand;
+				}
+			}
+			catch { }
+
+			if (uvPath == null)
+			{
+				return "UV package manager not found. Please install UV first.";
+			}
+
+			string serverSrc = McpConfigFileHelper.ResolveServerDirectory(pythonDir, existingArgs);
+			var newArgs = new[] { "run", "--directory", serverSrc, "server.py" };
+
+			bool changed = true;
+			if (!string.IsNullOrEmpty(existingCommand) && existingArgs != null)
+			{
+				changed = !string.Equals(existingCommand, uvPath, StringComparison.Ordinal)
+					|| !ArgsEqual(existingArgs, newArgs);
+			}
+
+			if (!changed)
+			{
+				return "Configured successfully";
+			}
+
+			string codexBlock = CodexConfigHelper.BuildCodexServerBlock(uvPath, serverSrc);
+			string updatedToml = CodexConfigHelper.UpsertCodexServerBlock(existingToml, codexBlock);
+
+			McpConfigFileHelper.WriteAtomicFile(configPath, updatedToml);
+
+			try
+			{
+				if (IsValidUv(uvPath)) EditorPrefs.SetString("MCPForUnity.UvPath", uvPath);
+				EditorPrefs.SetString("MCPForUnity.ServerSrc", serverSrc);
+			}
+			catch { }
+
+			return "Configured successfully";
+		}
 
         private void ShowCursorManualConfigurationInstructions(
             string configPath,
@@ -1721,28 +1657,36 @@ namespace MCPForUnity.Editor.Windows
                 string[] args = null;
                 bool configExists = false;
                 
-                switch (mcpClient.mcpType)
-                {
-                    case McpTypes.VSCode:
-                        dynamic config = JsonConvert.DeserializeObject(configJson);
+				switch (mcpClient.mcpType)
+				{
+					case McpTypes.VSCode:
+						dynamic config = JsonConvert.DeserializeObject(configJson);
 						
-                        // New schema: top-level servers
-                        if (config?.servers?.unityMCP != null)
-                        {
-                            args = config.servers.unityMCP.args.ToObject<string[]>();
-                            configExists = true;
-                        }
-                        // Back-compat: legacy mcp.servers
-                        else if (config?.mcp?.servers?.unityMCP != null)
-                        {
-                            args = config.mcp.servers.unityMCP.args.ToObject<string[]>();
-                            configExists = true;
-                        }
-                        break;
+						// New schema: top-level servers
+						if (config?.servers?.unityMCP != null)
+						{
+							args = config.servers.unityMCP.args.ToObject<string[]>();
+							configExists = true;
+						}
+						// Back-compat: legacy mcp.servers
+						else if (config?.mcp?.servers?.unityMCP != null)
+						{
+							args = config.mcp.servers.unityMCP.args.ToObject<string[]>();
+							configExists = true;
+						}
+						break;
 
-                    default:
-                        // Standard MCP configuration check for Claude Desktop, Cursor, etc.
-                        McpConfig standardConfig = JsonConvert.DeserializeObject<McpConfig>(configJson);
+					case McpTypes.Codex:
+						if (CodexConfigHelper.TryParseCodexServer(configJson, out _, out var codexArgs))
+						{
+							args = codexArgs;
+							configExists = true;
+						}
+						break;
+						
+					default:
+						// Standard MCP configuration check for Claude Desktop, Cursor, etc.
+						McpConfig standardConfig = JsonConvert.DeserializeObject<McpConfig>(configJson);
                         
                         if (standardConfig?.mcpServers?.unityMCP != null)
                         {
@@ -1755,8 +1699,8 @@ namespace MCPForUnity.Editor.Windows
                 // Common logic for checking configuration status
                 if (configExists)
                 {
-                    string configuredDir = ExtractDirectoryArg(args);
-                    bool matches = !string.IsNullOrEmpty(configuredDir) && PathsEqual(configuredDir, pythonDir);
+                    string configuredDir = McpConfigFileHelper.ExtractDirectoryArg(args);
+                    bool matches = !string.IsNullOrEmpty(configuredDir) && McpConfigFileHelper.PathsEqual(configuredDir, pythonDir);
                     if (matches)
                     {
                         mcpClient.SetStatus(McpStatus.Configured);
@@ -1766,7 +1710,9 @@ namespace MCPForUnity.Editor.Windows
                         // Attempt auto-rewrite once if the package path changed
                         try
                         {
-                            string rewriteResult = WriteToConfig(pythonDir, configPath, mcpClient);
+                            string rewriteResult = mcpClient.mcpType == McpTypes.Codex
+                                ? ConfigureCodexClient(pythonDir, configPath, mcpClient)
+                                : WriteToConfig(pythonDir, configPath, mcpClient);
                             if (rewriteResult == "Configured successfully")
                             {
                                 if (debugLogsEnabled)

UnityMcpBridge/Editor/Windows/ManualConfigEditorWindow.cs

@@ -101,6 +101,13 @@ namespace MCPForUnity.Editor.Windows
                     instructionStyle
                 );
             }
+            else if (mcpClient?.mcpType == McpTypes.Codex)
+            {
+                EditorGUILayout.LabelField(
+                    "    a) Running `codex config edit` in a terminal",
+                    instructionStyle
+                );
+            }
             EditorGUILayout.LabelField("    OR", instructionStyle);
             EditorGUILayout.LabelField(
                 "    b) Opening the configuration file at:",
@@ -201,10 +208,10 @@ namespace MCPForUnity.Editor.Windows
 
             EditorGUILayout.Space(10);
 
-            EditorGUILayout.LabelField(
-                "2. Paste the following JSON configuration:",
-                instructionStyle
-            );
+            string configLabel = mcpClient?.mcpType == McpTypes.Codex
+                ? "2. Paste the following TOML configuration:"
+                : "2. Paste the following JSON configuration:";
+            EditorGUILayout.LabelField(configLabel, instructionStyle);
 
             // JSON section with improved styling
             EditorGUILayout.BeginVertical(EditorStyles.helpBox);