deepseek-ai/deepseek-harness · error

typert: invocation "${descriptor.id}" scope wire "${descript

Error message

typert: invocation "${descriptor.id}" scope wire "${descriptor.scope.wire}" must select its only lookup parameter

What it means

Error "typert: invocation "${descriptor.id}" scope wire "${descriptor.scope.wire}" must select its only lookup parameter" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/typert/registry/src/service.ts:682

      throw new Error(`typert: invocation "${descriptor.id}" JSON parameter "${parameter.name}" declares a lookup key`)
    }
    validateCodec(parameter.codec, `${descriptor.id} parameter ${parameter.name}`)
  }
  const cancellation = descriptor.cancellation as { readonly parameter: string } | undefined
  if (cancellation !== undefined && cancellation.parameter !== 'signal') {
    throw new Error(`typert: invocation "${descriptor.id}" cancellation parameter must be "signal"`)
  }
  if (descriptor.scope !== undefined) {
    if (descriptor.invocation.kind !== 'direct') {
      throw new Error(`typert: invocation "${descriptor.id}" Context receiver cannot declare a direct scope projection`)
    }
    validateSegment('scope Context key', descriptor.scope.context)
    validateWireName('scope wire field', descriptor.scope.wire)
    const lookups = descriptor.parameters.filter(candidate => candidate.source === 'lookup')
    const parameter = lookups.length === 1 ? lookups[0] : undefined
    if (parameter === undefined || parameter.wire !== descriptor.scope.wire
      || parameter.lookup !== descriptor.scope.context) {
      throw new Error(
        `typert: invocation "${descriptor.id}" scope wire "${descriptor.scope.wire}" must select its only lookup parameter`,
      )
    }
  }
  if (descriptor.invocation.kind === 'context') {
    validateSegment('Context key', descriptor.invocation.context)
    validateWireName('Context wire field', descriptor.invocation.wire)
    if (wires.has(descriptor.invocation.wire)) {
      throw new Error(`typert: invocation "${descriptor.id}" repeats wire field "${descriptor.invocation.wire}"`)
    }
    validateCodec(descriptor.invocation.codec, `${descriptor.id} Context`)
  }
}

function validateCodec(codec: InvocationDescriptor['result'], subject: string): void {
  if (codec.mode === 'src-json') return
  validateNonempty(`${subject} type symbol`, codec.typeSymbol)
  if (typeof codec.schema.parse !== 'function') {

View on GitHub (pinned to b150a551b8)

Solutions

1. Point the scope wire at the invocation's only lookup parameter.

When it happens

Trigger: Thrown at packages/typert/registry/src/service.ts:682 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/67f2b0582a98dc19. Report an issue: GitHub.