deepseek-ai/deepseek-harness · error

typert: invocation "${descriptor.id}" JSON parameter "${para

Error message

typert: invocation "${descriptor.id}" JSON parameter "${parameter.name}" declares a lookup key

What it means

Error "typert: invocation "${descriptor.id}" JSON parameter "${parameter.name}" declares a lookup key" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/typert/registry/src/service.ts:664

  validateCodec(descriptor.result, `${descriptor.id} result`)
  const wires = new Set<string>()
  for (const parameter of descriptor.parameters) {
    validateWireName('parameter name', parameter.name)
    validateWireName('parameter wire field', parameter.wire)
    if (wires.has(parameter.wire)) {
      throw new Error(`typert: invocation "${descriptor.id}" repeats wire field "${parameter.wire}"`)
    }
    wires.add(parameter.wire)
    if (parameter.source === 'lookup') {
      if (parameter.acceptsUndefined !== undefined) {
        throw new Error(`typert: invocation "${descriptor.id}" lookup parameter "${parameter.name}" cannot accept undefined`)
      }
      if (parameter.lookup === undefined) {
        throw new Error(`typert: invocation "${descriptor.id}" lookup parameter "${parameter.name}" has no lookup key`)
      }
      validateSegment('lookup key', parameter.lookup)
    } else if (parameter.lookup !== undefined) {
      throw new Error(`typert: invocation "${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(

View on GitHub (pinned to b150a551b8)

Solutions

1. Remove the lookup key from the JSON parameter; lookup keys belong to lookup parameters.

When it happens

Trigger: Thrown at packages/typert/registry/src/service.ts:664 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/f506479e219d17df. Report an issue: GitHub.