Hydrolyzes the glucosidic bonds of unbranched Glc residues in tamarind seed xyloglucan, producing XXXG, XLXG, XXLG and XLLG. Has a low activity against beta-glucan and carboxymethylcellulose. Not active against Avicel, laminarin, xylan, galactomannan, linear and branched arabinans, galactan, polygalacturonic acid, starch, beta-D-Glcp, beta-D-cellobiose, beta-D-Galp, beta-D-Xylp, alpha-D-Xylp, alpha-L-Araf and alpha-L-Arap. Hydrolysis of (1->4)-D-glucosidic linkages in xyloglucans so as to successively remove oligosaccharides from the newly-formed chain end after endo-initiation on a polymer molecule. Optimum pH is 5.3. Has a half life of 15 minutes at 60 degrees Celsius. Belongs to the glycosyl hydrolase 74 family.