If the required channels aren't in your workspace yet, add them first:
pixi workspace channel add --prepend https://prefix.dev/conda-forge https://prefix.dev/robostack-humbleThen install the package:
pixi add ros-humble-slam-toolboxInstall globally (CLI tools)
For packages that expose command-line tools, install globally to use them anywhere:
pixi global install --channel https://prefix.dev/conda-forge --channel https://prefix.dev/robostack-humble ros-humble-slam-toolbox