Revert change to structured output defaults.

Author: eiriktsarpalis

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

@@ -30,10 +30,12 @@ private protected ChatResponseFormat()
     /// <param name="schema">The JSON schema.</param>
     /// <param name="schemaName">An optional name of the schema. For example, if the schema represents a particular class, this could be the name of the class.</param>
     /// <param name="schemaDescription">An optional description of the schema.</param>
+    /// <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) =>
+        JsonElement schema, string? schemaName = null, string? schemaDescription = null, bool schemaIsStrict = false) =>
         new(schema,
             schemaName,
-            schemaDescription);
+            schemaDescription,
+            schemaIsStrict);
 }

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

@@ -16,9 +16,10 @@ public sealed class ChatResponseFormatJson : ChatResponseFormat
     /// <param name="schema">The schema to associate with the JSON response.</param>
     /// <param name="schemaName">A name for the schema.</param>
     /// <param name="schemaDescription">A description of the schema.</param>
+    /// <param name="schemaIsStrict">Whether the response should strictly adhere to the schema.</param>
     [JsonConstructor]
     public ChatResponseFormatJson(
-        JsonElement? schema, string? schemaName = null, string? schemaDescription = null)
+        JsonElement? schema, string? schemaName = null, string? schemaDescription = null, bool schemaIsStrict = false)
     {
         if (schema is null && (schemaName is not null || schemaDescription is not null))
         {
@@ -30,6 +31,7 @@ public ChatResponseFormatJson(
         Schema = schema;
         SchemaName = schemaName;
         SchemaDescription = schemaDescription;
+        SchemaIsStrict = schemaIsStrict;
     }
 
     /// <summary>Gets the JSON schema associated with the response, or <see langword="null"/> if there is none.</summary>
@@ -41,6 +43,9 @@ public ChatResponseFormatJson(
     /// <summary>Gets a description of the schema.</summary>
     public string? SchemaDescription { get; }
 
+    /// <summary>Gets a value indicating whether the response should strictly adhere to the schema.</summary>
+    public bool SchemaIsStrict { get; }
+
     /// <summary>Gets a string representing this instance to display in the debugger.</summary>
     [DebuggerBrowsable(DebuggerBrowsableState.Never)]
     private string DebuggerDisplay => Schema?.ToString() ?? "JSON";

src/Libraries/Microsoft.Extensions.AI.AzureAIInference/AzureAIInferenceChatClient.cs

@@ -370,7 +370,8 @@ private ChatCompletionsOptions ToAzureAIOptions(IEnumerable<ChatMessage> chatCon
                             ["required"] = BinaryData.FromBytes(JsonSerializer.SerializeToUtf8Bytes(tool.Required, JsonContext.Default.ListString)),
                             ["additionalProperties"] = _falseString,
                         },
-                        json.SchemaDescription);
+                        json.SchemaDescription,
+                        json.SchemaIsStrict);
                 }
                 else
                 {

src/Libraries/Microsoft.Extensions.AI.OpenAI/OpenAIChatClient.cs

@@ -611,7 +611,8 @@ private static ChatCompletionOptions ToOpenAIOptions(ChatOptions? options)
                         jsonFormat.SchemaName ?? "json_schema",
                         BinaryData.FromBytes(
                             JsonSerializer.SerializeToUtf8Bytes(jsonSchema, ChatClientJsonContext.Default.JsonElement)),
-                        jsonFormat.SchemaDescription) :
+                        jsonFormat.SchemaDescription,
+                        jsonFormat.SchemaIsStrict) :
                     OpenAI.Chat.ChatResponseFormat.CreateJsonObjectFormat();
             }
         }

src/Libraries/Microsoft.Extensions.AI.OpenAI/OpenAIResponseChatClient.cs

@@ -418,7 +418,8 @@ private static ResponseCreationOptions ToOpenAIResponseCreationOptions(ChatOptio
                         ResponseTextFormat.CreateJsonSchemaFormat(
                             jsonFormat.SchemaName ?? "json_schema",
                             BinaryData.FromBytes(JsonSerializer.SerializeToUtf8Bytes(jsonSchema, ResponseClientJsonContext.Default.JsonElement)),
-                            jsonFormat.SchemaDescription) :
+                            jsonFormat.SchemaDescription,
+                            jsonFormat.SchemaIsStrict) :
                         ResponseTextFormat.CreateJsonObjectFormat(),
                 };
             }

src/Libraries/Microsoft.Extensions.AI/ChatCompletion/ChatClientStructuredOutputExtensions.cs

@@ -25,6 +25,7 @@ public static class ChatClientStructuredOutputExtensions
         IncludeSchemaKeyword = true,
         DisallowAdditionalProperties = true,
         IncludeTypeInEnumSchemas = true,
+        RequireAllProperties = true,
     };
 
     /// <summary>Sends chat messages, requesting a response matching the type <typeparamref name="T"/>.</summary>

test/Libraries/Microsoft.Extensions.AI.Abstractions.Tests/ChatCompletion/ChatResponseFormatTests.cs

@@ -80,5 +80,6 @@ public void Serialization_ForJsonSchemaRoundtrips()
         Assert.Equal("[1,2,3]", JsonSerializer.Serialize(actual.Schema, TestJsonSerializerContext.Default.JsonElement));
         Assert.Equal("name", actual.SchemaName);
         Assert.Equal("description", actual.SchemaDescription);
+        Assert.False(actual.SchemaIsStrict);
     }
 }

test/Libraries/Microsoft.Extensions.AI.Tests/ChatCompletion/ChatClientStructuredOutputExtensionsTests.cs

@@ -58,7 +58,12 @@ public async Task SuccessUsage_Default()
                           ]
                         }
                       },
-                      "additionalProperties": false
+                      "additionalProperties": false,
+                      "required": [
+                        "id",
+                        "fullName",
+                        "species"
+                      ]
                     }
                     """, responseFormat.Schema.ToString());
                 Assert.Equal(nameof(Animal), responseFormat.SchemaName);
@@ -346,7 +351,12 @@ public async Task CanSpecifyCustomJsonSerializationOptions()
                           "type": "integer"
                         }
                       },
-                      "additionalProperties": false
+                      "additionalProperties": false,
+                      "required": [
+                        "id",
+                        "full_name",
+                        "species"
+                      ]
                     }
                     """, responseFormat.Schema.ToString());