The box0%Never empty. Nothing leaves. Until it is full.
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Why this session
It “forgot”At message forty, it no longer knows what you said at message three. It did not forget. It fell out of the box.
It got worseThe longer the conversation, the vaguer the answer. Same tool, same model. What changed is the box.
The brochureVendors print a very big number. That number is the box. It is not your free space.
The context window is not a technical detail. It is the reason a good conversation goes bad.
Three things
What you leave with
One picture: a box with a fixed volume. Never empty when you arrive, and what happens when it is full.
Eight reflexes: where to put things, what to keep out, and how to check what is inside.
Three signs that the box is full, before the tool tells you.
No sizes, no model names. The mechanism, and the habits that follow from it.
01
A box with a fixed volume
What is already inside when you arrive, and how little of it is actually yours.
The box
Everything you give it has to fit
system
tools
your setup
the conversation
…room to work
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System instructionsThe vendor’s rules and guardrails. You never see them, you cannot remove them.
ToolsEverything it may call on, described in the box even when you use none of it.
Your setupThe project, the instructions, the memory. Set once, there at every message.
The conversationEvery message, every document, every result. It stays.
Room to workWhat is left. The answer is written in there.
The box is never empty when you start. And the answer still has to fit in what is left.
Live
Fill the box
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Your words are invisible. What fills the box is what you attach.
Sizes
Not the number on the brochure
The brochure“A very large context window.”
the whole box
Before your first wordSystem, tools, your setup.
already taken
Yours, this morningWhat is free when you open a new conversation.
room to work
Yours, at message thirtyAfter the contract, the grid, the thread.
left
A vendor says: my box is huge. Ask the real question. How much is still free, after all the rest?
Every message
One answer, one full box
system
tools
your setup
the conversation
…the answer
read from hereto here, every time →
It reads the whole boxTo write one line, it reads everything in the box. Not the last message: everything. Every time.
Nothing outside existsNo memory between two answers. If it is not in the box, it never happened.
Same box, seen from the billThat is the Saving tokens session: the whole box, read again at every message, is what you pay.
02
What happens when it is full
It does not tell you. It does not choose. It drops the oldest.
Overflow
The oldest pages fall out
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Not the least useful. The oldest.It does not sort. It does not weigh. The first page in is the first page out.
Documents take several pagesA contract pushes twenty messages out at once. Including your brief.
It does not tell youNo warning, no blank. The answer simply changes.
Attention
Lost in the middle
the beginning · read closelythe middle · skimmedthe end · read closely
The beginningThe instructions, the project, your first message. Solid ground.
The middleMessage twenty of sixty. In the box, but blurred. A fact there is easy to miss.
The endYour last message. What it reads most closely, right before it writes.
Even inside the box, not everything gets the same attention. What sits in the middle of a long conversation is the first to blur.
Live
Watch it travel
The fact enters at the bottom, fresh. Messages pile under it. It climbs, it blurs, it leaves.
context limitmessage 0
Message 1
Budget cap for this renewal: 40,000. Never mention it to the client.
In the box. Fresh. At the very end.
Message 60 · two PDFs and a spreadsheet later
What was the budget cap again?
“You did not mention a budget cap.” Or worse: a confident number that is not yours.
Same conversation. The fact fell out. The tool did not warn you.
Live
Let me show you.
A fact at message one. The same question at message sixty.
Prepared this morning: a long conversation, two PDFs, a spreadsheet. The brief is at the top. Let us see if it is still there.
The idea behind every reflex
It does not remember. It reads a box.
What is in the box decides the answer. What is not, does not exist.
03
Eight reflexes
Where to put things, what to keep out, and how to check. None of them needs a setting.
Reflexes
Where you put it
1The ask goes lastDocuments first, question at the end. The end is what it reads most closely, right before it writes.
2Repeat what mattersAt message forty, say the constraint again. Ten words. Do not trust the box to carry it from message one.
3Rules at the start, asks at the endWhat never changes goes in the project or the instructions. What changes goes in your last message.
Same words, different place, different answer.
Reflexes
Edit, do not append
4Edit the message, do not pile onMost tools let you edit an earlier message. Everything after it leaves the box. A correction on top keeps both versions in.
5Restart from a summaryWhen the box is heavy: ten lines, new conversation. You choose what survives. Not the box.
Pile on
Brief: deadline Monday.3
Plan for Monday…4
No: Friday, not Monday.5
Plan for Friday…6
Both deadlines are in the box. It will pick one.
Edit message 3
Brief: deadline Monday Friday.3 · edited
Plan for Friday…4
No: Friday, not Monday.gone
Plan for Friday…gone
One deadline in the box. Two messages fewer.
Reflexes
What stays in the box
6The excerpt, not the fileThe three pages that matter. The whole file takes the room your answer needs, and pushes your brief out.
7One box, one jobNew subject, new conversation. The old subject is not context. It is weight, in the middle, where things blur.
8Ask what it remembersBefore you rely on it: “What do you know about this deal so far?” Ten seconds, and you see the box.
You cannot see the box. So check it.
Eight reflexes
The ask goes lastPaste first. Ask at the end.
Repeat what mattersTen words at message forty.
Rules at the start, asks at the endProject for what never changes.
Edit the message, do not pile onEverything after it leaves the box.
Restart from a summaryYou choose what survives.
The excerpt, not the fileThe file pushes your brief out.
One box, one jobNew subject, new conversation.
Ask what it remembers“What do you know so far?”
04
What is in every box
Projects, memory, connectors, compaction: what arrives before your first word, and what fetches instead of pasting.
Before your first word
Projects and memory
system
tools
your project + memoryinstructions, twenty documents, what it remembers about you
the conversation
…room
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ProjectInstructions and reference documents, posted once. In the box of every conversation, before you type.
InstructionsWho you are, how you like answers. Short: it takes room in every box.
MemoryWhat it kept from earlier conversations. Check it once in a while: a stale memory is a wrong fact, at the start of every box.
A project holds what every conversation needs. Not the archive.
Connectors
Fetch, do not paste
Paste the archive
sys
tools
setup
twenty documents
…
Twenty documents in the box. Your brief is out. The answer has no room.
Fetch from the archive
sys
tools
setup
3 hits
…room to work
Three passages in the box. The archive stays outside. Room to work.
A connector searches the archive and brings back what matches. The archive never enters the box.
Compaction
When the tool summarises for you
Summary of the conversation so farRenewal with Carrefour. Plan in three steps. Draft email agreed, formal tone. Pricing: three tiers.
Brief: renewal, budget cap 40k, decision Friday
Understood. Plan in three steps…
Attach the framework agreement
Clause 12 says…
Draft the email to the buyer
Here is a draft…
Shorter. More formal.
Shorter version…
Paste the pricing grid
The grid shows three tiers…
Add a line on delivery
What survivesThe plan, the decisions, the tone. Whatever the summary kept.
What falls outThe figure at message one. The exact wording of clause 12. The reason behind a choice.
What to doRead the summary. Correct it. Repeat the fact that matters, in ten words.
05
Reading the box
You cannot see it. Three signs tell you it is full.
Signs
Three signs the box is full
This conversation is getting long. Consider starting a new one.what the tool says, when it says it
It forgets your briefIt asks for something you already gave. Or ignores it. The brief fell out, or it is blurred in the middle.
It contradicts itselfMonday, then Friday. Two versions in the box, and it picks one. Usually the last.
The tool tells youSome tools warn. Believe them. Summary, new box. Do not push one more document in.
All three say the same thing: the box is full. Summary, new conversation, repeat the fact.
One sentence ties it all together
The box is never empty. Nothing you put in it leaves, until it is full.
Choose what is in the box, and where.
Before next time
Find the fact it forgot
Take
One long conversation of yours from this week. The one where it “forgot”.
Bring
The message where the fact fell out. And the reflex that would have kept it in.
The eight reflexes fit on one page. It is yours to keep.