NousResearch/hermes-agent · error

Desktop preview buffer bridge is unavailable

Error message

Desktop preview buffer bridge is unavailable

What it means

Error "Desktop preview buffer bridge is unavailable" thrown in NousResearch/hermes-agent.

Source

Thrown at apps/desktop/src/lib/local-preview.ts:167

  if (!bridge?.openPreviewInBrowser) {
    throw new Error('Desktop preview browser bridge is unavailable')
  }

  const dataUrl = target.dataUrl && validatedRemoteHtmlDataUrl(target.dataUrl)

  if (!dataUrl) {
    if (target.transient) {
      throw new Error('Remote HTML preview could not be loaded')
    }

    await bridge.openPreviewInBrowser(target.url)

    return
  }

  if (!bridge.saveImageBuffer) {
    throw new Error('Desktop preview buffer bridge is unavailable')
  }

  const decoded = atob(dataUrl.slice(dataUrl.indexOf(',') + 1))
  const bytes = Uint8Array.from(decoded, char => char.charCodeAt(0))
  const filePath = await bridge.saveImageBuffer(bytes, '.html')

  if (!filePath) {
    throw new Error('Could not stage remote HTML preview')
  }

  await bridge.openPreviewInBrowser(pathToFileUrl(filePath))
}

export function localPreviewTarget(rawTarget: string, cwd?: string | null): PreviewTarget | null {
  const raw = rawTarget.trim().replace(/^`|`$/g, '')

  if (!raw) {
    return null

View on GitHub (pinned to c896c09c42)

Solutions

1. Run this feature inside the Hermes desktop app; the preview buffer bridge only exists there.
2. Reconnect the desktop bridge and retry.

When it happens

Trigger: Thrown at apps/desktop/src/lib/local-preview.ts:167 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of NousResearch/hermes-agent@c896c09c42 (2026-08-14). Data as JSON: /api/errors/0fe71c42c02c90ad. Report an issue: GitHub.