The ornamental design for a tool accessory, as shown and described.
FIG. 1 is a perspective view of a tool accessory showing my new design;
FIG. 2 is a front elevational view showing the design for the tool accessory of FIG. 1;
FIG. 3 is a rear elevational view showing the design for the tool accessory of FIG. 1;
FIG. 4 is right side elevational view showing the design for the tool accessory of FIG. 1;
FIG. 5 is a left side elevational view showing the design for the tool accessory of FIG. 1;
FIG. 6 is a top elevational view showing the design for the tool accessory of FIG. 1; and,
FIG. 7 is a bottom elevational view showing the design for the tool accessory of FIG. 1.
The broken line showing of portions of the tool accessory in the drawings is included for illustrative purposes only and forms no part of the claimed design.