Function persistBlobToTextBlock

src/services/mcp/client.ts:2598–2627

* Decode base64 binary content, write it to disk with the proper extension, * and return a small text block with the file path. Replaces the old behavior * of dumping raw base64 into the context.

(
  bytes: Buffer,
  mimeType: string | undefined,
  serverName: string,
  sourceDescription: string,
)

 * of dumping raw base64 into the context.
 */
async function persistBlobToTextBlock(
  bytes: Buffer,
  mimeType: string | undefined,
  serverName: string,
  sourceDescription: string,
): Promise<Array<ContentBlockParam>> {
  const persistId = `mcp-${normalizeNameForMCP(serverName)}-blob-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`
  const result = await persistBinaryContent(bytes, mimeType, persistId)

  if ('error' in result) {
    return [
      {
        type: 'text',
        text: `${sourceDescription}Binary content (${mimeType || 'unknown type'}, ${bytes.length} bytes) could not be saved to disk: ${result.error}`,
      },
    ]
  }

  return [
    {
      type: 'text',
      text: getBinaryBlobSavedMessage(
        result.filepath,
        mimeType,
        result.size,
        sourceDescription,
      ),
    },
  ]
}

/**
 * Processes MCP tool result into a normalized format.