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fix: preserve per-step usage in AssistantMessage #441

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fix: preserve per-step usage in AssistantMessage #441

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3 changes: 3 additions & 0 deletions src/claude_agent_sdk/_internal/message_parser.py
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Original file line number Diff line number Diff line change
Expand Up @@ -124,6 +124,9 @@ def parse_message(data: dict[str, Any]) -> Message:
model=data["message"]["model"],
parent_tool_use_id=data.get("parent_tool_use_id"),
error=data["message"].get("error"),
# Per-step fields from Anthropic API response
message_id=data["message"].get("id"),
usage=data["message"].get("usage"),
)
except KeyError as e:
raise MessageParseError(
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3 changes: 3 additions & 0 deletions src/claude_agent_sdk/types.py
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Expand Up @@ -574,6 +574,9 @@ class AssistantMessage:
model: str
parent_tool_use_id: str | None = None
error: AssistantMessageError | None = None
# Per-step fields from Anthropic API response
message_id: str | None = None # API message ID (e.g., "msg_...")
usage: dict[str, Any] | None = None # Per-step token usage


@dataclass
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