deepseek-ai/deepseek-harness · error · Error

Ralph subagent provider "${name}" does not support structure

Error message

Ralph subagent provider "${name}" does not support structured output

What it means

Error "Ralph subagent provider "${name}" does not support structured output" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/workflow/tool-ralph/src/index.ts:226

function resolveMaxRounds(requested: number | undefined, ceiling: number): number {
  const value = requested ?? ceiling
  if (!Number.isSafeInteger(value) || value < 1) {
    throw new TypeError('Ralph maxRounds must be a positive safe integer')
  }
  if (value > ceiling) {
    throw new TypeError(`Ralph maxRounds ${value} exceeds the deployment ceiling ${ceiling}`)
  }
  return value
}

/** Require the configured route to mean a genuinely fresh structured child. */
function requireFreshProvider(ctx: Context, name: string): SubagentProvider {
  const provider = ctx.subagents.getProvider(name)
  if (provider === undefined) {
    throw new Error(`Ralph subagent provider "${name}" is not registered`)
  }
  if (!provider.capabilities.outputSchema) {
    throw new Error(`Ralph subagent provider "${name}" does not support structured output`)
  }
  if (provider.inheritsParentContext) {
    throw new Error(`Ralph subagent provider "${name}" inherits parent context; Ralph requires a fresh provider`)
  }
  return provider
}

function isRecord(value: unknown): value is Record<string, unknown> {
  return typeof value === 'object' && value !== null && !Array.isArray(value)
}

function normalizedText(value: unknown): value is string {
  return typeof value === 'string' && value.length > 0 && value === value.trim()
}

function normalizedList(value: unknown): value is string[] {
  return Array.isArray(value) && value.every(normalizedText)
}

View on GitHub (pinned to b150a551b8)

Solutions

1. Point subagentProvider at a provider that supports structured output; Ralph requires structured reports.

When it happens

Trigger: Thrown at packages/workflow/tool-ralph/src/index.ts:226 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/d1c4c8b50f334c95. Report an issue: GitHub.