deepseek-ai/deepseek-harness · error · Error

invalid todos: duplicate content ${JSON.stringify(content)}

Error message

invalid todos: duplicate content ${JSON.stringify(content)}

What it means

Error "invalid todos: duplicate content ${JSON.stringify(content)}" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/todo/tool-todo/src/index.ts:101

 * deployment allows parallel work. The registry has already enforced the status enum and rejected
 * unknown item keys (`additionalProperties: false` — the logged snapshot must equal what the model
 * believes it wrote, so a nested/extended item shape fails loud at the schema boundary instead of
 * silently flattening); the cast below records that guarantee.
 * @param raw - the model-supplied list, already schema-checked.
 * @param allowParallel - whether several items may be `in_progress` at once.
 * @returns the canonical list.
 */
function toTodoList(raw: { content: string; status: string }[], allowParallel: boolean): TodoItem[] {
  const todos: TodoItem[] = []
  const seen = new Set<string>()
  let active = 0
  for (const item of raw) {
    const content = item.content.trim()
    if (content.length === 0) {
      throw new Error('invalid todo: `content` must be a non-empty string')
    }
    if (seen.has(content)) {
      throw new Error(`invalid todos: duplicate content ${JSON.stringify(content)}`)
    }
    seen.add(content)
    if (item.status === 'in_progress') active++
    todos.push({ content, status: item.status as TodoItem['status'] })
  }
  if (!allowParallel && active > 1) {
    throw new Error(`invalid todos: at most one task may be in_progress (got ${active})`)
  }
  return todos
}

/** Wire payload schema of the `todos` projection (whole list or pre-first-write null). */
const todosProjectionSchema: ZodType<TodoItem[] | null> = zod.union([
  zod.array(zod.object({
    content: zod.string(),
    status: zod.union([zod.literal('pending'), zod.literal('in_progress'), zod.literal('completed')]),
  })),
  zod.null(),

View on GitHub (pinned to b150a551b8)

Solutions

1. Remove or rename the duplicate todo content.

When it happens

Trigger: Thrown at packages/todo/tool-todo/src/index.ts:101 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/c9a05d36a8f422a9. Report an issue: GitHub.