docs: Add MEAI integration guide page and fix site_name

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: HavenDV

docs/guides/meai.md

@@ -0,0 +1,132 @@
+# Microsoft.Extensions.AI Integration
+
+The AI21 SDK implements `IChatClient` from [Microsoft.Extensions.AI](https://learn.microsoft.com/en-us/dotnet/ai/microsoft-extensions-ai), providing a unified interface for chat completions with text, streaming, tool calling, and reasoning support.
+
+## Installation
+
+```bash
+dotnet add package tryAGI.AI21
+```
+
+## Chat Completions
+
+`Ai21Client` directly implements `IChatClient`, so you can use it with the standard MEAI interface without any adapters.
+
+```csharp
+using Microsoft.Extensions.AI;
+using AI21;
+
+IChatClient client = new Ai21Client(apiKey: Environment.GetEnvironmentVariable("AI21_API_KEY")!);
+
+var response = await client.GetResponseAsync(
+    "What is the capital of France?",
+    new ChatOptions { ModelId = "jamba-1.5-mini" });
+
+Console.WriteLine(response.Text);
+```
+
+## Streaming
+
+```csharp
+using Microsoft.Extensions.AI;
+using AI21;
+
+IChatClient client = new Ai21Client(apiKey: Environment.GetEnvironmentVariable("AI21_API_KEY")!);
+
+await foreach (var update in client.GetStreamingResponseAsync(
+    "Explain quantum computing in simple terms.",
+    new ChatOptions { ModelId = "jamba-1.5-mini" }))
+{
+    Console.Write(update.Text);
+}
+```
+
+## Tool Calling
+
+```csharp
+using Microsoft.Extensions.AI;
+using AI21;
+
+IChatClient client = new Ai21Client(apiKey: Environment.GetEnvironmentVariable("AI21_API_KEY")!);
+
+var tool = AIFunctionFactory.Create(
+    (string location) => $"The weather in {location} is sunny, 22C.",
+    "GetWeather",
+    "Gets the current weather for a given location.");
+
+var options = new ChatOptions
+{
+    ModelId = "jamba-1.5-mini",
+    Tools = [tool],
+};
+
+var messages = new List<ChatMessage>
+{
+    new(ChatRole.User, "What is the weather in London?"),
+};
+
+// The loop handles automatic tool invocation
+while (true)
+{
+    var response = await client.GetResponseAsync(messages, options);
+    messages.AddRange(response.ToChatMessages());
+
+    if (response.FinishReason == ChatFinishReason.ToolCalls)
+    {
+        var results = await response.CallToolsAsync(options);
+        messages.AddRange(results);
+        continue;
+    }
+
+    Console.WriteLine(response.Text);
+    break;
+}
+```
+
+## Reasoning
+
+AI21 Jamba models support reasoning content. When reasoning is present, it is returned as `TextReasoningContent` in the response message.
+
+```csharp
+using Microsoft.Extensions.AI;
+using AI21;
+
+IChatClient client = new Ai21Client(apiKey: Environment.GetEnvironmentVariable("AI21_API_KEY")!);
+
+var response = await client.GetResponseAsync(
+    "If a train leaves at 3pm going 60mph and another leaves at 4pm going 90mph, when do they meet?",
+    new ChatOptions { ModelId = "jamba-1.5-mini" });
+
+foreach (var content in response.Messages.SelectMany(m => m.Contents))
+{
+    switch (content)
+    {
+        case TextReasoningContent reasoning:
+            Console.WriteLine($"Reasoning: {reasoning.Text}");
+            break;
+        case TextContent text:
+            Console.WriteLine($"Answer: {text.Text}");
+            break;
+    }
+}
+```
+
+## Dependency Injection
+
+```csharp
+using Microsoft.Extensions.AI;
+using AI21;
+
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.AddSingleton<IChatClient>(
+    new Ai21Client(apiKey: builder.Configuration["AI21:ApiKey"]!));
+```
+
+## Provider Metadata
+
+```csharp
+var metadata = client.GetService<ChatClientMetadata>();
+Console.WriteLine($"Provider: {metadata?.ProviderName}"); // "Ai21Client"
+Console.WriteLine($"Endpoint: {metadata?.ProviderUri}");
+```

mkdocs.yml

@@ -1,6 +1,8 @@
-site_name: OpenAI .NET Documentation
+site_name: AI21 .NET Documentation
 nav:
 - Overview: index.md
+- Guides:
+  - Microsoft.Extensions.AI: guides/meai.md
 # EXAMPLES:START
 
 # EXAMPLES:END