Throughline keeps the thread of work intact on work that's big enough to drift or that outlives one sitting. Two linked habits: (1) TASK TRACK — an emoji-tagged task list with exactly one ⭐️ MAIN goal anchor, so you can see at a glance whether you're still solving the main thing or have drifted; (2) HANDOFF — compact a session into a plain-markdown handoff doc the next agent (any agent) can pick up cleanly. Reach for it when: a long or many-step task is at real risk of losing the thread, you catch yourself drifting off the original goal, you're wrapping up or running low on context, you're switching agents or sessions, or you're explicitly asked to 'hand this off' / 'write a handoff' / 'summarize for the next session' / 'compact this' / 'pick up where we left off' / 'resume'. Do NOT reach for it on short, self-contained tasks that finish in one pass — the full protocol is overhead there. Capability-agnostic and cross-platform — works as a skill or a plain paste-in prompt.