deepseek-ai/deepseek-harness · error

internal

internal

Error message

subagent prompt failed

What it means

Error "subagent prompt failed" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/host/apiproxy/src/api-proxy.ts:879

        return err(request, {
          code: 'subagent-unauthorized',
          message: 'subagent does not belong to this parent',
          details: { childSessionId },
        })
      case 'DRAINING':
      case 'ACTIVATION_CLOSING':
      case 'CONTINUATION_UNAVAILABLE':
      case 'PERSISTENCE_UNAVAILABLE':
        return err(request, {
          code: 'subagent-delivery-unavailable',
          message: 'subagent follow-up is temporarily unavailable',
          details: { childSessionId },
        })
      default:
        break
    }
  }
  return err(request, { code: 'internal', message: 'subagent prompt failed', details: {} })
}

/** Stable RPC face of the missing projections capability, shared by every catalog read path. */
function projectionsUnavailableError(): RpcError {
  return {
    code: 'internal',
    message: 'subagent catalog is unavailable: this deployment does not mount the sessionProjections registry (load @deepseek-ai/dsh-session-projection)',
    details: {},
  }
}

/** Verify one address and mode against the complete direct-child catalog. */
async function catalogChild(
  ctx: Context,
  address: SubagentAddress,
  signal?: AbortSignal,
): Promise<{
  entry?: Extract<CatalogSubagentListEntry, { kind: 'child' }>

View on GitHub (pinned to b150a551b8)

Solutions

1. Inspect the underlying cause of the subagent prompt failure in the logs and fix it before retrying.

When it happens

Trigger: Thrown at packages/host/apiproxy/src/api-proxy.ts:879 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/ea6e899975a46ecf. Report an issue: GitHub.