Module stream 

SSE Streaming Parser for the Claude Messages API

The Claude API sends Server-Sent Events (SSE) when stream: true. Format: event: <name>\ndata: <json>\n\n

This module provides:

• SseParser: reads raw bytes from reqwest and yields typed StreamEvents
• MessageAccumulator: builds a complete MessagesResponse from events

The tricky part: bytes arrive in arbitrary chunks that may split mid-line. We buffer until we see \n\n (end of SSE event), then parse.

Structs

MessageAccumulator

Accumulates streaming events into a complete MessagesResponse.

MessageDeltaPayload

Top-level message metadata update

SseParser

Parses SSE events from a reqwest byte stream.

Enums

ContentDelta

Incremental content within a content_block_delta event

StreamEvent

All possible SSE event types from the Claude streaming API. Each variant matches an event: <name> line in the SSE stream.