Simplify MCP client configs (#401)

* First pass at MCP client refactor

* Restore original text instructions

Well most of them, I modified a few

* Move configurators to their own folder

It's less clusterd

* Remvoe override for Windsurf because we no longer need to use it

* Add Antigravity configs

Works like Windsurf, but it sucks ass

* Add some docs for properties

* Add comprehensive MCP client configurators documentation

* Add missing imports (#7)

* Handle Linux paths when unregistering CLI commands

* Construct a JSON error in a much more secure fashion

Author: msanatan

MCPForUnity/Editor/Clients.meta

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using MCPForUnity.Editor.Constants;
+using MCPForUnity.Editor.Models;
+using UnityEditor;
+
+namespace MCPForUnity.Editor.Clients.Configurators
+{
+    public class AntigravityConfigurator : JsonFileMcpConfigurator
+    {
+        public AntigravityConfigurator() : base(new McpClient
+        {
+            name = "Antigravity",
+            windowsConfigPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), ".gemini", "antigravity", "mcp_config.json"),
+            macConfigPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), ".gemini", "antigravity", "mcp_config.json"),
+            linuxConfigPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), ".gemini", "antigravity", "mcp_config.json"),
+            HttpUrlProperty = "serverUrl",
+            DefaultUnityFields = { { "disabled", false } },
+            StripEnvWhenNotRequired = true
+        })
+        { }
+
+        public override IList<string> GetInstallationSteps() => new List<string>
+        {
+            "Open Antigravity",
+            "Click the more_horiz menu in the Agent pane > MCP Servers",
+            "Select 'Install' for Unity MCP or use the Configure button above",
+            "Restart Antigravity if necessary"
+        };
+    }
+}

MCPForUnity/Editor/Clients/Configurators.meta

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+using System.Collections.Generic;
+using MCPForUnity.Editor.Models;
+
+namespace MCPForUnity.Editor.Clients.Configurators
+{
+    public class ClaudeCodeConfigurator : ClaudeCliMcpConfigurator
+    {
+        public ClaudeCodeConfigurator() : base(new McpClient
+        {
+            name = "Claude Code",
+            windowsConfigPath = string.Empty,
+            macConfigPath = string.Empty,
+            linuxConfigPath = string.Empty,
+        })
+        { }
+
+        public override IList<string> GetInstallationSteps() => new List<string>
+        {
+            "Ensure Claude CLI is installed",
+            "Use the Register button to register automatically\nOR manually run: claude mcp add UnityMCP",
+            "Restart Claude Code"
+        };
+    }
+}

MCPForUnity/Editor/Clients/Configurators/AntigravityConfigurator.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using MCPForUnity.Editor.Constants;
+using MCPForUnity.Editor.Models;
+using UnityEditor;
+
+namespace MCPForUnity.Editor.Clients.Configurators
+{
+    public class ClaudeDesktopConfigurator : JsonFileMcpConfigurator
+    {
+        public ClaudeDesktopConfigurator() : base(new McpClient
+        {
+            name = "Claude Desktop",
+            windowsConfigPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "Claude", "claude_desktop_config.json"),
+            macConfigPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), "Library", "Application Support", "Claude", "claude_desktop_config.json"),
+            linuxConfigPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), ".config", "Claude", "claude_desktop_config.json"),
+            SupportsHttpTransport = false
+        })
+        { }
+
+        public override IList<string> GetInstallationSteps() => new List<string>
+        {
+            "Open Claude Desktop",
+            "Go to Settings > Developer > Edit Config\nOR open the config path",
+            "Paste the configuration JSON",
+            "Save and restart Claude Desktop"
+        };
+
+        public override void Configure()
+        {
+            bool useHttp = EditorPrefs.GetBool(EditorPrefKeys.UseHttpTransport, true);
+            if (useHttp)
+            {
+                throw new InvalidOperationException("Claude Desktop does not support HTTP transport. Switch to stdio in settings before configuring.");
+            }
+
+            base.Configure();
+        }
+
+        public override string GetManualSnippet()
+        {
+            bool useHttp = EditorPrefs.GetBool(EditorPrefKeys.UseHttpTransport, true);
+            if (useHttp)
+            {
+                return "# Claude Desktop does not support HTTP transport.\n" +
+                       "# Open Advanced Settings and disable HTTP transport to use stdio, then regenerate.";
+            }
+
+            return base.GetManualSnippet();
+        }
+    }
+}

MCPForUnity/Editor/Data/McpClients.cs.meta renamed to MCPForUnity/Editor/Clients/Configurators/AntigravityConfigurator.cs.meta

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using MCPForUnity.Editor.Models;
+
+namespace MCPForUnity.Editor.Clients.Configurators
+{
+    public class CodexConfigurator : CodexMcpConfigurator
+    {
+        public CodexConfigurator() : base(new McpClient
+        {
+            name = "Codex",
+            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")
+        })
+        { }
+
+        public override IList<string> GetInstallationSteps() => new List<string>
+        {
+            "Run 'codex config edit' in a terminal\nOR open the config file at the path above",
+            "Paste the configuration TOML",
+            "Save and restart Codex"
+        };
+    }
+}