deepseek-ai/deepseek-harness · error

PlanModeConfig needs a string `section`

Error message

PlanModeConfig needs a string `section`

What it means

Error "PlanModeConfig needs a string `section`" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/plan/plan-mode/src/index.ts:109

function firstHeading(plan: string): string | undefined {
  for (const line of plan.split('\n')) {
    const match = /^#{1,6}\s+(.+?)\s*$/.exec(line)
    if (match) return match[1]
  }
  return undefined
}

/**
 * Validate deployment-owned plan guidance. Missing, blank, non-string, or
 * unknown fields fail at plugin load rather than being ignored.
 *
 * @param config Raw plugin config.
 * @returns A detached validated config.
 */
export function resolveConfig(config: PlanModeConfig): PlanModeConfig {
  const section = (config as Partial<PlanModeConfig>).section
  if (typeof section !== 'string') {
    throw new Error('PlanModeConfig needs a string `section`')
  }
  if (section.trim() === '') {
    throw new Error('PlanModeConfig needs a non-empty `section`')
  }
  const unknown = Object.keys(config).filter(key => key !== 'section')
  if (unknown.length > 0) {
    throw new Error(`PlanModeConfig has unknown key(s) ${unknown.join(', ')} — config is { section }`)
  }
  return { section }
}

/**
 * Whether plan mode is active after the first `end` events. The last
 * `plan/mode` wins; a prefix with none is inactive.
 *
 * @param events The session log or any prefix of it.
 * @param end Fold `events[0, end)`; defaults to the whole log.
 * @returns Whether plan mode is active.

View on GitHub (pinned to b150a551b8)

Solutions

1. Set PlanModeConfig.section to a string.

When it happens

Trigger: Thrown at packages/plan/plan-mode/src/index.ts:109 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/fdebc1a72bd3bc5f. Report an issue: GitHub.