deepseek-ai/deepseek-harness · error · Error

llm-deepseek: only reasoningEffort "off" can be configured w

Error message

llm-deepseek: only reasoningEffort "off" can be configured when thinking is disabled

What it means

Error "llm-deepseek: only reasoningEffort "off" can be configured when thinking is disabled" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/llm/llm-deepseek/src/index.ts:279

}

/**
 * The one explicit resolve step from raw config to validated connection
 * facts. Programmatic construction may bypass Schemastery normalization, so
 * every default and bound is re-judged here — for the composition entry at
 * load (fail loud) and for each settings snapshot at its first use.
 * @param config - raw plugin config or resolved settings snapshot.
 * @param environment - this run's environment layers, or `undefined` outside
 * the product CLI. Every layer may supply an endpoint: the product trusts the
 * project it is launched in, so a checkout can point its own agent at the
 * gateway that checkout is meant to use.
 * @returns validated connection facts plus the credential reference.
 */
export function resolveAdapterOptions(config: Config, environment?: LaunchEnvironmentSnapshot): ResolvedDeepSeekOptions {
  if (config.thinking === 'disabled'
    && config.reasoningEffort !== undefined
    && config.reasoningEffort !== 'off') {
    throw new Error('llm-deepseek: only reasoningEffort "off" can be configured when thinking is disabled')
  }
  if (config.defaultContextWindow !== undefined
    && (!Number.isInteger(config.defaultContextWindow) || config.defaultContextWindow <= 0)) {
    throw new Error('llm-deepseek: defaultContextWindow must be a positive integer')
  }
  if (config.maxTokens !== undefined
    && (!Number.isSafeInteger(config.maxTokens) || config.maxTokens <= 0)) {
    throw new Error('llm-deepseek: maxTokens must be a positive safe integer')
  }
  const streamIdleTimeoutMs = config.streamIdleTimeoutMs ?? DEFAULT_STREAM_IDLE_TIMEOUT_MS
  if (!Number.isFinite(streamIdleTimeoutMs)
    || streamIdleTimeoutMs <= 0
    || streamIdleTimeoutMs > MAX_TIMER_DELAY_MS) {
    throw new Error(
      `llm-deepseek: streamIdleTimeoutMs must be a positive finite number no greater than ${MAX_TIMER_DELAY_MS}`,
    )
  }
  const maxRequestFilesBytes = config.maxRequestFilesBytes ?? DEFAULT_MAX_REQUEST_FILES_BYTES

View on GitHub (pinned to b150a551b8)

Solutions

1. Set reasoningEffort to "off", or enable thinking for the model.

When it happens

Trigger: Thrown at packages/llm/llm-deepseek/src/index.ts:279 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/e1323957ae272cb7. Report an issue: GitHub.