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Long threads do not fail loudly. They rot quietly. Claude re-reads the whole conversation every turn, so everything that ever happened in a thread stays in view and competes with the current question: the detour about a different property, the sixty pages you pasted “for background,” the three rounds of corrections. None of it gets forgotten, which is exactly the problem. The window fills with noise, the answers drift, and each reply costs more than the last. The skill is noticing the rot early and resetting on your terms.

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Put one thread on the monitor

A working session, six moments long. At each moment you choose what a busy person would do or what a careful one would. Two vitals respond: signal, the share of the window that is actually about the current question, and load, how full and expensive the thread has become.
Nothing in that thread was a mistake by itself. Pasting a document, taking a detour, correcting an error: all normal. The rot comes from doing it all in one immortal thread and expecting message forty to behave like message four.

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The reset ritual

When a thread has done its job, or stopped doing it, do not abandon the work. Move it:
  1. Ask the thread to pack its own bags: “Summarize what we’ve established: decisions, current numbers, constraints, open questions. Under 200 words. I’m moving to a fresh chat.”
  2. Start the new chat.
  3. Open with your brief plus that summary. You keep every conclusion and shed every dead end, correction loop, and stale paste.
Reset triggers worth trusting: the topic changed, you are scrolling up to find what Claude knows, answers keep referencing things you no longer care about, or replies are getting slower and vaguer at the same time.

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The reusable brief

The paste-in brief is the cheapest power tool in this course: a short block you keep in your notes and drop into any fresh conversation. Five lines, rarely more:
WhoAsset management team, US office portfolio, I run leasing for two towers.
FactsOccupancy 91%. Three renewals in play this quarter. Rates in the attached sheet.
ConstraintsNever quote below floor rates. Legal reviews anything sent to tenants.
VoiceShort, direct, no exclamation points, numbers over adjectives.
Done meansSomething I can forward without editing.
Write it once, reuse it everywhere: fresh chats, new projects, handoffs to teammates. If you find yourself typing the same setup a third time, that is the brief telling you it wants to exist.

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Daily habits that keep threads clean

  • One thread, one topic. New topic, new chat. Chats are free; confusion is not.
  • Paste excerpts, not archives. The two pages that matter, not the sixty that exist.
  • Correct once, cleanly. Restate the fact in one message instead of arguing across five.
  • End well. If the thread produced something durable, file it in the project before you close it.