dartantic_interface

Streaming Thinking via ChatResult.thinking

Added optional thinking field to ChatResult for streaming thinking content. During streaming, thinking deltas are delivered via chunk.thinking for real-time display, while the consolidated ThinkingPart appears in final messages for history.

Breaking Change: Migrated to genai_primitives Types

Core message and part types are now provided by the genai_primitives package and re-exported from dartantic_interface. This provides better interoperability with other GenAI tooling in the Dart ecosystem.

Types re-exported from genai_primitives:

• ChatMessage, ChatMessageRole
• StandardPart, TextPart, DataPart, LinkPart, ThinkingPart
• ToolPart, ToolPartKind
• ToolDefinition

Part Type Alias (genai_primitives 0.2.0 compatibility)

In genai_primitives 0.2.0, the Part type hierarchy was reorganized:

• Part became the extendable base class
• StandardPart is the sealed class containing built-in part types

Dartantic provides Part as a typedef alias for StandardPart, so existing code continues to work unchanged. If you need to create a custom Part that extends the base class, import genai_primitives directly:

import 'package:genai_primitives/genai_primitives.dart' as gaip;
class MyCustomPart extends gaip.Part { ... }

Breaking Change: Migrated to json_schema_builder for Schemas

The Schema type is now provided by the json_schema_builder package. Use the S builder class for constructing schemas:

import 'package:dartantic_interface/dartantic_interface.dart';

// Build schemas with S.*
final schema = S.object(properties: {
  'name': S.string(description: 'User name'),
  'age': S.integer(minimum: 0),
});

New: ThinkingPart for Extended Reasoning

Added ThinkingPart to represent extended thinking/reasoning content from LLMs. This provides a unified representation across providers that support thinking (OpenAI Responses, Anthropic, Google).

New Convenience Extensions

Added MessagePartHelpers extension on Iterable<Part>:

• thinkingParts - extracts all ThinkingPart instances
• thinkingText - concatenates all thinking text