Tools are key items that allow you to upgrade your weapons at workbenches. The higher level the upgrade, the higher level tool you will need. Some upgrades will not require tools, and will only show a part requirement at a workbench, while others indicate the specific tool required by a tool icon and a number in the workbench menu.
| Tools (Level 1) | Found in the church basement of Bill's Town, after Bill rescues Joel and Ellie from the mass of Runners and Clickers. |
| Tools (Level 2) | Found in Pittsburgh after the initial fight and entering a garage via a garage doorway. |
| Tools (Level 3) | Found in The Suburbs Sewer after Ellie starts the generator and Henry and Sam ride across, look for an equipment room. |
| Tools (Level 4) | Found in The University on the second floor of the Science Building. Shiv open he lecture room at the end of the floor. |
| Tools (Level 5) | Found in a tent in the FEDRA triage section of the Bus Depot. |
