deepseek-ai/deepseek-harness · error · LlmError

STREAM_CLOSED

STREAM_CLOSED

Error message

SSE stream ended without [DONE]

What it means

Error "SSE stream ended without [DONE]" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/llm/llm-deepseek/src/sse.ts:39

 * Parse an SSE byte stream into data payloads. Yields `[DONE]` as the final
 * value and returns; throws `LlmError('STREAM_CLOSED')` when the stream ends
 * without it (truncated response — the model call cannot be trusted).
 * @param stream - raw SSE bytes; reads may split anywhere, including mid-UTF-8 sequence.
 * @param onComment - optional transport-activity callback; comments never enter the yielded payload stream.
 * @returns each event's data payload in arrival order, the `[DONE]` sentinel last.
 */
export async function* parseSse(
  stream: ReadableStream<BufferSource>,
  onComment?: (comment: string) => void,
): AsyncGenerator<string> {
  const events = stream
    .pipeThrough(new TextDecoderStream())
    .pipeThrough(new EventSourceParserStream({ onComment }))
  for await (const { data } of events) {
    yield data
    if (data === DONE) return
  }
  throw new LlmError('SSE stream ended without [DONE]', 'STREAM_CLOSED')
}

View on GitHub (pinned to b150a551b8)

Solutions

1. Retry the request; the SSE connection ended before the [DONE] marker.

When it happens

Trigger: Thrown at packages/llm/llm-deepseek/src/sse.ts:39 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/c565ce7e6e66ab48. Report an issue: GitHub.