Tweak strict mode signature, fix failing tests.

Author: eiriktsarpalis

src/Libraries/Microsoft.Extensions.AI.Abstractions/ChatCompletion/ChatResponseFormat.cs

@@ -33,7 +33,7 @@ private protected ChatResponseFormat()
     /// <param name="schemaIsStrict">Whether the response should strictly adhere to the schema.</param>
     /// <returns>The <see cref="ChatResponseFormatJson"/> instance.</returns>
     public static ChatResponseFormatJson ForJsonSchema(
-        JsonElement schema, string? schemaName = null, string? schemaDescription = null, bool schemaIsStrict = false) =>
+        JsonElement schema, string? schemaName = null, string? schemaDescription = null, bool? schemaIsStrict = false) =>
         new(schema,
             schemaName,
             schemaDescription,

src/Libraries/Microsoft.Extensions.AI.Abstractions/ChatCompletion/ChatResponseFormatJson.cs

@@ -19,7 +19,7 @@ public sealed class ChatResponseFormatJson : ChatResponseFormat
     /// <param name="schemaIsStrict">Whether the response should strictly adhere to the schema.</param>
     [JsonConstructor]
     public ChatResponseFormatJson(
-        JsonElement? schema, string? schemaName = null, string? schemaDescription = null, bool schemaIsStrict = false)
+        JsonElement? schema, string? schemaName = null, string? schemaDescription = null, bool? schemaIsStrict = null)
     {
         if (schema is null && (schemaName is not null || schemaDescription is not null))
         {
@@ -44,8 +44,7 @@ public ChatResponseFormatJson(
     public string? SchemaDescription { get; }
 
     /// <summary>Gets a value indicating whether the response should strictly adhere to the schema.</summary>
-    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
-    public bool SchemaIsStrict { get; }
+    public bool? SchemaIsStrict { get; }
 
     /// <summary>Gets a string representing this instance to display in the debugger.</summary>
     [DebuggerBrowsable(DebuggerBrowsableState.Never)]

test/Libraries/Microsoft.Extensions.AI.AzureAIInference.Tests/AzureAIInferenceChatClientTests.cs

@@ -385,7 +385,8 @@ public async Task ResponseFormat_JsonSchema_NonStreaming()
                             "required":["description"],
                             "additionalProperties":false
                          },
-                         "description":"An object with a description"
+                         "description":"An object with a description",
+                         "strict":false
                     }
                 }
             }