deepseek-ai/deepseek-harness · error · Error

harness.defineTool ${path}.oneOf must contain at least two s

Error message

harness.defineTool ${path}.oneOf must contain at least two schemas

What it means

Error "harness.defineTool ${path}.oneOf must contain at least two schemas" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/extensions/cordis-host-runner/src/guard.ts:389

    if (ancestors.has(value)) throw new Error(`harness.defineTool ${path} is circular`)
    ancestors.add(value)
    const requiredKey = task.parameterProperty && !task.raw ? ['required'] : []
    if (task.parameterProperty && task.raw && Object.hasOwn(value, 'required') && value.type !== 'object') {
      throw new Error(`harness.defineTool ${path}.required belongs to the containing raw object schema`)
    }
    if (task.parameterProperty && !task.raw && Object.hasOwn(value, 'required') && value.required !== true) {
      throw new Error(`harness.defineTool ${path}.required must be true when present`)
    }
    const prop: Record<string, unknown> = {}
    assignNormalizedValue(task.destination, prop)
    tasks.push({ kind: 'leave', value })
    if (task.forceRequired || value.required === true) prop.required = true
    copyAnnotations(value, prop, path)

    if (Object.hasOwn(value, 'oneOf')) {
      assertSchemaKeys(value, path, ['oneOf', ...requiredKey, ...ANNOTATION_KEYS])
      if (!isDensePlainArray(value.oneOf) || value.oneOf.length < 2) {
        throw new Error(`harness.defineTool ${path}.oneOf must contain at least two schemas`)
      }
      const oneOf: Record<string, unknown>[] = []
      prop.oneOf = oneOf
      for (let index = value.oneOf.length - 1; index >= 0; index--) {
        tasks.push({
          kind: 'value',
          value: value.oneOf[index],
          path: `${path}.oneOf[${index}]`,
          forceRequired: false,
          raw: task.raw,
          parameterProperty: false,
          destination: { kind: 'one-of', target: oneOf, index },
        })
      }
      continue
    }

    if (task.raw && !Object.hasOwn(value, 'type')) {

View on GitHub (pinned to b150a551b8)

When it happens

Trigger: Thrown at packages/extensions/cordis-host-runner/src/guard.ts:389 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/c82d2424a65b6e2d. Report an issue: GitHub.