deepseek-ai/deepseek-harness · error · Error

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

Error message

harness.defineTool ${path}.additionalProperties must be true or omitted because the implicit parameter root is open

What it means

Error "harness.defineTool ${path}.additionalProperties must be true or omitted because the implicit parameter root is open" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/extensions/cordis-host-runner/src/guard.ts:226

/**
 * Normalize a sandbox-provided `parameters` value into a fresh host-realm
 * ParameterSchemaSpec. A raw JSON-Schema object wrapper retains its open root
 * default, while the direct DSL is already an implicit open property map.
 */
function normalizeParameterSchemaSpec(value: unknown, path = 'parameters'): {
  spec: Record<string, unknown>
  rootAnnotations?: Record<string, unknown>
} {
  if (!isPlainRecord(value)) {
    throw new Error(`harness.defineTool ${path} must be a ParameterSchemaSpec object`)
  }
  if (value.type === 'object') {
    assertSchemaKeys(value, path, ['type', 'properties', 'required', 'additionalProperties', ...ANNOTATION_KEYS])
    if (!isPlainRecord(value.properties)) {
      throw new Error(`harness.defineTool ${path}.properties must be an object of schemas`)
    }
    if (Object.hasOwn(value, 'additionalProperties') && value.additionalProperties !== true) {
      throw new Error(`harness.defineTool ${path}.additionalProperties must be true or omitted because the implicit parameter root is open`)
    }
    if (Object.hasOwn(value, 'required') && value.required === undefined) {
      throw new Error(`harness.defineTool ${path}.required must be an array of declared property names`)
    }
    const required = normalizeRequiredNames(value.required, value.properties, `${path}.required`)
    const rootAnnotations: Record<string, unknown> = {}
    copyAnnotations(value, rootAnnotations, path)
    return {
      spec: normalizePropertyMap(value.properties, path, required, true),
      ...(Object.keys(rootAnnotations).length === 0 ? {} : { rootAnnotations }),
    }
  }
  return { spec: normalizePropertyMap(value, path, new Set(), false) }
}

/** Validate raw required names and return their lookup set. */
function normalizeRequiredNames(value: unknown, properties: Record<string, unknown>, path: string): Set<string> {
  if (value === undefined) return new Set()

View on GitHub (pinned to b150a551b8)

When it happens

Trigger: Thrown at packages/extensions/cordis-host-runner/src/guard.ts:226 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/3a9fcd9a62cb4e75. Report an issue: GitHub.