deepseek-ai/deepseek-harness · error · TypertGatewayError

signature-invalid

signature-invalid

Error message

SRC cancellation parameter signal must be the final parameter

What it means

Error "SRC cancellation parameter signal must be the final parameter" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/api/gateway/src/index.ts:274

      throw new TypertGatewayError(
        'ambiguous-endpoint',
        endpoint,
        `multiple active Services export this endpoint: ${candidates.map(candidate => candidate.service).sort().join(', ')}`,
      )
    }
    return candidates[0] as InvocationDescriptor
  }

  private srcDescriptor(
    binding: TypertGatewayBinding,
    marker: ReturnType<typeof remoteMethods>[number],
    method: string,
    endpoint: string,
  ): InvocationDescriptor {
    const names = methodParameterNames(binding.service, marker.method, endpoint)
    const signalIndex = names.indexOf('signal')
    if (signalIndex >= 0 && signalIndex !== names.length - 1) {
      throw new TypertGatewayError(
        'signature-invalid',
        endpoint,
        'SRC cancellation parameter signal must be the final parameter',
        { field: 'signal' },
      )
    }
    const cancellation = signalIndex >= 0
      ? { parameter: 'signal' as const }
      : undefined
    const businessNames = cancellation === undefined ? names : names.slice(0, -1)
    const parameters: InvocationParameterDescriptor[] = []
    const wires = new Set<string>()
    for (const name of businessNames) {
      const matches = this.ctx.typert.lookups.definitions()
        .filter(definition => definition.parameter === name)
      if (matches.length > 1) {
        throw new TypertGatewayError(
          'signature-invalid',

View on GitHub (pinned to b150a551b8)

Solutions

1. Move the signal parameter to the final position of the SRC function signature.

When it happens

Trigger: Thrown at packages/api/gateway/src/index.ts:274 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/0d46eb54105ed681. Report an issue: GitHub.