deepseek-ai/deepseek-harness · error · WorkflowError

AGENT_START

AGENT_START

Error message

no subagent provider registered for "${provider}"

What it means

Error "no subagent provider registered for "${provider}"" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/workflow/workflow-worker-thread/src/index.ts:86

  try {
    // Parse only — the script object is discarded, nothing executes.
    void new vm.Script(`(async () => {\n${body}\n})()`, { filename: `workflow:${name}`, lineOffset: -1 })
  } catch (error: unknown) {
    throw new WorkflowError(`workflow script does not parse: ${String(error)}`, 'SCRIPT_PARSE', { cause: error })
  }
}

/** Resolve one run's provider route before publishing work. */
function resolveSubagentProvider(ctx: Context, configured: string, override: string | undefined): string {
  const provider = override ?? configured
  if (provider.length === 0 || provider !== provider.trim()) {
    throw new WorkflowError(
      'workflow subagentProvider must be a non-empty normalized string',
      'INVALID_ARGUMENT',
    )
  }
  if (ctx.subagents.getProvider(provider) === undefined) {
    throw new WorkflowError(`no subagent provider registered for "${provider}"`, 'AGENT_START')
  }
  return provider
}

/** Resolve one run's total-child cap against the engine deployment ceiling. */
function resolveMaxTotalAgents(requested: number | undefined, ceiling: number): number {
  if (requested === undefined) return ceiling
  if (!Number.isSafeInteger(requested) || requested < 1) {
    throw new WorkflowError('workflow maxTotalAgents must be a positive safe integer', 'INVALID_ARGUMENT')
  }
  if (requested > ceiling) {
    throw new WorkflowError(
      `workflow maxTotalAgents ${requested} exceeds the engine ceiling ${ceiling}`,
      'INVALID_ARGUMENT',
    )
  }
  return requested
}

View on GitHub (pinned to b150a551b8)

Solutions

1. Register a subagent provider under the configured name in cordis.yml, or change the configured provider name to a registered one.

When it happens

Trigger: Thrown at packages/workflow/workflow-worker-thread/src/index.ts:86 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/b9cd219671a2d3a4. Report an issue: GitHub.