deepseek-ai/deepseek-harness · error · Error

harness.defineTool ${path}.additionalProperties must be expl

Error message

harness.defineTool ${path}.additionalProperties must be explicitly true or false

What it means

Error "harness.defineTool ${path}.additionalProperties must be explicitly true or false" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/extensions/cordis-host-runner/src/guard.ts:422

      continue
    }

    if (task.raw && !Object.hasOwn(value, 'type')) {
      assertSchemaKeys(value, path, ANNOTATION_KEYS)
      prop.type = 'json'
      continue
    }
    if (!SCHEMA_TYPES.has(value.type) || task.raw && value.type === 'json') {
      throw new Error(`harness.defineTool ${path} must declare a valid type: ${VALID_TYPES} (got ${JSON.stringify(value.type)})`)
    }
    const type = value.type
    prop.type = type

    switch (type) {
      case 'object': {
        assertSchemaKeys(value, path, ['type', 'properties', 'additionalProperties', ...requiredKey, ...(task.raw ? ['required'] : []), ...ANNOTATION_KEYS])
        if (!task.raw && (!Object.hasOwn(value, 'additionalProperties') || typeof value.additionalProperties !== 'boolean')) {
          throw new Error(`harness.defineTool ${path}.additionalProperties must be explicitly true or false`)
        }
        if (task.raw && Object.hasOwn(value, 'additionalProperties') && typeof value.additionalProperties !== 'boolean') {
          throw new Error(`harness.defineTool ${path}.additionalProperties must be a boolean`)
        }
        if (task.raw && Object.hasOwn(value, 'required') && value.required === undefined) {
          throw new Error(`harness.defineTool ${path}.required must be an array of declared property names`)
        }
        prop.additionalProperties = task.raw ? value.additionalProperties ?? true : value.additionalProperties
        if (Object.hasOwn(value, 'properties')) {
          const properties = value.properties
          if (!isPlainRecord(properties)) throw new Error(`harness.defineTool ${path}.properties must be an object of schemas`)
          const nestedRequired = task.raw
            ? normalizeRequiredNames(value.required, properties, `${path}.required`)
            : new Set<string>()
          tasks.push({
            kind: 'map',
            entries: properties,
            path: `${path}.properties`,

View on GitHub (pinned to b150a551b8)

When it happens

Trigger: Thrown at packages/extensions/cordis-host-runner/src/guard.ts:422 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/955768b1cb13d9d6. Report an issue: GitHub.