deepseek-ai/deepseek-harness · error · TypertGatewayError

arguments-invalid

arguments-invalid

Error message

args must be a plain object

What it means

Error "args must be a plain object" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/api/gateway/src/index.ts:592

  }
  return [...names]
}

function invalidSignature(endpoint: string, method: string): never {
  throw new TypertGatewayError(
    'signature-invalid',
    endpoint,
    `SRC method ${JSON.stringify(method)} must use unique identifier parameters without destructuring, defaults, or rest`,
  )
}

function assertExactArguments(
  args: Readonly<Record<string, unknown>>,
  descriptor: InvocationDescriptor,
  endpoint: string,
): void {
  if (!isPlainObject(args)) {
    throw new TypertGatewayError('arguments-invalid', endpoint, 'args must be a plain object')
  }
  const expected = new Set(descriptor.parameters.map(parameter => parameter.wire))
  if (descriptor.invocation.kind === 'context') expected.add(descriptor.invocation.wire)
  const actual = Reflect.ownKeys(args)
  const extra = actual.filter(key => typeof key !== 'string' || !expected.has(key))
  // A JSON field may be omitted when the strict descriptor declares absence,
  // and always under SRC: a weak descriptor reads parameter names from the
  // JavaScript signature and cannot see which are optional, so LIB is where an
  // omitted required argument is caught. Lookup ids are never omissible.
  const acceptsMissing = new Set(descriptor.parameters
    .filter(parameter => parameter.source === 'json'
      && (parameter.acceptsUndefined === true || parameter.codec.mode === 'src-json'))
    .map(parameter => parameter.wire))
  const missing = [...expected].filter(key => !Object.hasOwn(args, key) && !acceptsMissing.has(key))
  if (extra.length === 0 && missing.length === 0) return
  const clauses: string[] = []
  if (missing.length > 0) clauses.push(`missing ${missing.map(key => JSON.stringify(key)).join(', ')}`)
  if (extra.length > 0) clauses.push(`unexpected ${extra.map(key => JSON.stringify(String(key))).join(', ')}`)

View on GitHub (pinned to b150a551b8)

Solutions

1. Pass a plain object for args; arrays, null, and class instances are rejected.

When it happens

Trigger: Thrown at packages/api/gateway/src/index.ts:592 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/8a96999f4029338d. Report an issue: GitHub.