A role's instructions can reference another role in the same Strategy by name, or point back at the overall project it's part of — both get resolved to the real, specific workspace the moment you click Instantiate, before any of those workspaces even exist yet.
This is what actually makes a hand-off between two roles work: an instruction like "hand this to the Builder" resolves into the Builder's real, freshly created workspace, not a placeholder.
One thing worth knowing: that reference matches a role by its exact name. If you rename a role after writing another role's instructions around it, go back and update every reference to match — a stale reference doesn't error, it just quietly fails to resolve.