Add more functionality to signature description parsing

claude_dspy/trace.py

@@ -0,0 +1,52 @@
+from dataclasses import dataclass
+from typing import Any
+
+
+@dataclass
+class TraceItem:
+    """Base class for trace items."""
+
+    pass
+
+
+@dataclass
+class AgentMessageItem(TraceItem):
+    """Agent's text response."""
+
+    text: str
+    model: str
+
+
+@dataclass
+class ThinkingItem(TraceItem):
+    """Agent's internal reasoning (extended thinking)."""
+
+    text: str
+    model: str
+
+
+@dataclass
+class ToolUseItem(TraceItem):
+    """Tool invocation request."""
+
+    tool_name: str
+    tool_input: dict[str, Any]
+    tool_use_id: str
+
+
+@dataclass
+class ToolResultItem(TraceItem):
+    """Tool execution result."""
+
+    tool_name: str
+    tool_use_id: str
+    content: str | list[dict[str, Any]] | None = None
+    is_error: bool = False
+
+
+@dataclass
+class ErrorItem(TraceItem):
+    """Error that occurred during execution."""
+
+    message: str
+    error_type: str | None = None