deepseek-ai/deepseek-harness · error · LlmError

UNSUPPORTED_OPTION

UNSUPPORTED_OPTION

Error message

llm-pi-ai does not support GenerateOptions.stop

What it means

Error "llm-pi-ai does not support GenerateOptions.stop" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/llm/llm-pi-ai/src/adapter.ts:327

  override prepareCall(provider: string, model: string, _signal?: AbortSignal): Promise<PreparedAdapterCall> {
    const snapshot = this.current()
    return Promise.resolve({
      model: this.modelInfo(snapshot, provider, model),
      stream: options => this.streamWithSnapshot(options, snapshot),
    })
  }

  stream(options: GenerateOptions): AsyncIterable<StreamChunk> {
    return this.streamWithSnapshot(options, this.current())
  }

  private async * streamWithSnapshot(
    options: GenerateOptions,
    snapshot: PiAiSnapshot,
  ): AsyncIterable<StreamChunk> {
    if (options.stop !== undefined) {
      throw new LlmError('llm-pi-ai does not support GenerateOptions.stop', 'UNSUPPORTED_OPTION')
    }
    // One capture per stream call, taken before any await: the profile, the
    // model descriptor, and the collection all come from the same immutable
    // snapshot, and the credential freezes with them. A configuration change
    // mid-request builds a separate snapshot, so this request finishes under
    // the one it started with and the next call picks up the new one.
    const profile = this.profileOf(snapshot, options.provider)
    const model = this.modelOf(snapshot, options.provider, options.model)
    const reasoning = resolveReasoningLevel(
      model,
      options.reasoningEffort ?? profile.reasoning,
    )
    const apiKey = await this.config.resolveApiKey(options.provider, profile)

    const consumer = new AbortController()
    const upstream = options.signal === undefined
      ? consumer.signal
      : AbortSignal.any([options.signal, consumer.signal])

View on GitHub (pinned to b150a551b8)

Solutions

1. Remove GenerateOptions.stop, or use an adapter that supports stop sequences.

When it happens

Trigger: Thrown at packages/llm/llm-pi-ai/src/adapter.ts:327 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/83156c9fe9c10753. Report an issue: GitHub.