deepseek-ai/deepseek-harness · error · Error

harness.defineTool ${path} names undeclared property ${JSON.

Error message

harness.defineTool ${path} names undeclared property ${JSON.stringify(name)}

What it means

Error "harness.defineTool ${path} names undeclared property ${JSON.stringify(name)}" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/extensions/cordis-host-runner/src/guard.ts:255

    }
  }
  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()
  if (!isDensePlainArray(value)) {
    throw new Error(`harness.defineTool ${path} must be an array of declared property names`)
  }
  const names = new Set<string>()
  for (let index = 0; index < value.length; index++) {
    const name = value[index]
    if (typeof name !== 'string') {
      throw new Error(`harness.defineTool ${path} must be an array of declared property names`)
    }
    names.add(name)
    if (!Object.hasOwn(properties, name)) throw new Error(`harness.defineTool ${path} names undeclared property ${JSON.stringify(name)}`)
  }
  return names
}

/** Mutable holder used only while one normalized property-map root is unresolved. */
interface NormalizeRoot {
  value?: Record<string, unknown>
}

/** Where a normalized value node is installed. */
type NormalizeValueDestination =
  | { kind: 'property'; target: Record<string, unknown>; key: string }
  | { kind: 'item'; target: Record<string, unknown> }
  | { kind: 'one-of'; target: Record<string, unknown>[]; index: number }

/** Where a normalized property map is installed. */
type NormalizeMapDestination =
  | { kind: 'root'; holder: NormalizeRoot }

View on GitHub (pinned to b150a551b8)

When it happens

Trigger: Thrown at packages/extensions/cordis-host-runner/src/guard.ts:255 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/6f8d07f7304437d1. Report an issue: GitHub.