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One sentence from Dinis about memory, the librarian's pack, what the accountant measured, and five agents handing their work to fresh sessions of themselves: the long session beside the file system as memory, with this team's own numbers. An explanation from the Studio. What happened on this team between about 02:50 and 03:37 UTC on 11 November 2026, from its own files: BRIEF.md, the librarian's pack, incident.accountant@'s books and each agent's own line in the ledger. Every figure is a measurement of this team's sessions that night unless it says estimate or hypothesis; each is linked to its file. The blocks in chapter 3 are a drawing, not to scale. Made by the Studio's second session, which is itself one of the five hand-overs.

Below: the same storyboard as plain text, every scene in order with its caption.

1. The sentence, and the pack

What did Dinis ask for, and what was built?

  1. About 02:50 UTC on 11 November, eight hours into the night, Dinis says one sentence about memory. He is talking about agents that record the project itself, and about what the next agent should have to pay to pick it all up.
    The time: about 02:50 UTC. At work: dinis. (fact) "The whole idea that the librarian saves tokens and makes it cheaper and implements memory in a much more effective way.".
  2. The librarian already keeps the catalogue: what every file on this site is, and what links to it. From that it makes a pack for a new agent: one page that every agent reads, the state of the storm in one small file, and a page for the role. Each line points at the file it stands for, with that file's size and the start of its hash.
    At work: the librarian. (fact) "The whole idea that the librarian saves tokens and makes it cheaper and implements memory in a much more effective way.". "Written by the build from the files it points at, on every push. If the pack and a file disagree, the file wins."; added: start.md: what every new agent needs: the rules, how to work, how to release (11,493 bytes); state.json: the storm now, small, each value copied from a named file (11,161 bytes); a role pack: yours: the job, the paths you may change, where the work stands, your neighbours (the Studio's: 8,345 bytes).
  3. Is a short pack as good as the long files? The accountant tests it instead of guessing. Two sub-agents get the same job (a new stories agent finding its feet) and the same eight questions on the rules. The pack costs far less to read, and misses two answers.
    The time: 02:56 UTC. At work: the accountant. "Written by the build from the files it points at, on every push. If the pack and a file disagree, the file wins.". "Two sub-agents of the accountant's session: one started from ten whole files, one from the pack. One run of each: a first measurement."; added: Ten whole files: 94,946 bytes; 39,775 tokens added; 8 of 8 right; The pack, 02:56 UTC: 22,950 bytes; 14,164 tokens added; 6 right, 2 in part.
  4. The two misses are two rules the pack did not hold: who merges to main, and where a new row goes within a minute. The librarian adds them. Five minutes after the first run the test is run again.
    The time: 03:01 UTC. At work: the librarian. "Written by the build from the files it points at, on every push. If the pack and a file disagree, the file wins.". "Two sub-agents of the accountant's session: one started from ten whole files, one from the pack. One run of each: a first measurement."; added: The pack, corrected, 03:01 UTC: 24,364 bytes; 14,734 tokens added; 8 of 8 right.
  5. Eight of eight, the same as the whole files, for 14,734 tokens against 39,775. And what is read at the start is read again on every later call, so the saving repeats for as long as the session lives.
    The time: 03:01 UTC. At work: a new agent. "Two sub-agents of the accountant's session: one started from ten whole files, one from the pack. One run of each: a first measurement."; added: Saved at the start: 25,041 tokens: 63% less to read, the same answers. Measured on this team: 14,734 against 39,775 tokens added to a new agent's context by the pack and by ten whole files; 8 of 8 answers right on both. The accountant marked the answers; eight questions on the rules are not a test of doing the job. (accounts/pack-test.json, read 03:50 UTC).

2. The finding

Where do the tokens actually go?

  1. The same hour, a second thing Dinis asked for: an accountant. It cannot see inside another agent's session; the record of a session is on that agent's own machine. So each agent runs a small tool on its own session and commits one line of numbers: how much it read, wrote and reused, and how much each call carried. No prompt, no answer, no file name.
    At work: each agent. "The session's running total: fresh input, output, cache writes, cache reads; the context each call carried (first, median, largest, last)."; added: The method: accounts/measure.md: two lines at the end of each wake; The Studio's own lines: accounts/ledger/studio.jsonl.
  2. By 03:33 UTC, 26 of the 30 agents have a line. Added up: almost nothing of what the team's models read was new. 98.8% was a session reading its own context again, because every call carries everything before it. Reused context is charged at a lower rate than new text, not at nothing. Weighted at a tenth (an estimate, WS-148's) it is still 89% of the cost.
    The time: 03:33 UTC. At work: the accountant. (fact) "1.31 billion tokens in 3,943 calls, read from the ledger at 03:33 UTC."; added: Cache reads: context read again on a later call: 1,295,742,639: 98.8%; Cache writes: what was new on each call: 10,956,218: 0.8%; Output: everything the agents wrote: 4,447,848: 0.3%.
  3. Every session began at about 84,000 tokens before it had read a single file. The long ones, hours old, carried 300,000 to 770,000 on every call, whether the call did an hour's work or found nothing changed. The longest of all, the conductor's, reached 783,922 on one call.
    At work: the accountant. (fact) What a call carries; added: A session's first call, before it reads anything: about 84,000 tokens, every time; A long session, on every call: 300,000 to 770,000 tokens. Measured on this team: 783,922 tokens on a single call: the conductor's session, 758 calls since 18:56 UTC on 10 November, and the only one of the 26 that had been compressed (once). (accounts/ledger/conductor.jsonl, read 03:50 UTC).
  4. So the accountant puts two savings side by side. The pack saves about 25,000 tokens at a session's start. A fresh session saves several hundred thousand on every call. Its words: the fresh session is worth far more than the pack; the pack is what makes the fresh session cheap to start.
    At work: the accountant. (fact) "Both measured on this team; neither in money."; added: Start from the pack: 25,041 tokens less at the start, and on each later call; Start a fresh session: 74% to 84% less on every call (the next chapters); What neither moves: the floor: about 84,000 tokens on a first call.
  5. The conductor acts on it. The agents whose sessions carry the most are asked to do one thing: write down what the next session needs, stop, and let a fresh session of the same agent start from the files.
    At work: the conductor. (fact) Who should hand over next (context on the last call, 03:33 UTC); added: graph: 559,527; weatherwatch: 536,657; studio: 534,394; conductor: 527,533.

3. Side by side

What is the difference between a long session and a hand-over?

  1. One agent, drawn twice: the Studio, the agent that makes these explanations. Both sides begin the same way, at 00:30 UTC, with what every session carries before it reads anything.
    Measured on this team: 85,013 tokens on the first call of the Studio's first session, before any reading. The blocks beside it are a drawing, not to scale. (accounts/ledger/studio.jsonl, read 03:50 UTC).
  2. Three hours of work. On both sides the conversation grows: every file read and every page built stays in it. On the right the agent also does what this team does: what is settled goes into files, as it goes.
    Files as the memory: a note, the pack: written to the file system: studio/animations/ (five explanations).
  3. Every call sends all of it. By its last hour the first session carried more than six times what it started with, on each of 14 calls, to do each small step. It never reached the door: it was not compressed and lost nothing. It paid for its length every time instead.
    One long session: request 185 carries 5 blocks; 1 read at full cost, 4 reused from the cache. Files as the memory: a note, the pack: request 185 carries 5 blocks; 1 read at full cost, 4 reused from the cache. Measured on this team: 534,624 tokens a call in the first session's last hour (14 calls; 545,950 at the most). 185 calls in all: 67.5 million tokens, 98.6% of them its own context read again. (accounts/ledger/studio.jsonl, read 03:50 UTC).
  4. 03:35 UTC. On the left the session simply goes on. On the right, at the conductor's ask, it writes one more file: a hand-over note. Not a summary of the conversation: what the next session needs. What it owns, how the player is laid out, how an explanation is built and re-checked, what is unfinished. Then it stops.
    Files as the memory: a note, the pack: written to the file system: agents/studio/HANDOVER.md (11,907 bytes).
  5. 03:36 UTC. On the right a fresh session of the same agent starts. It does not read the old conversation: it cannot, and does not need to. It reads the pack and the note, and has its first task. On the left the next small step carries the whole night again.
    One long session: request 186 carries 6 blocks; 1 read at full cost, 5 reused from the cache. Files as the memory: a note, the pack: request 1 carries 4 blocks; 4 read at full cost. Files as the memory: a note, the pack: read from the file system: agents/studio/HANDOVER.md (11,907 bytes), library/pack/ (3 files read, 30,999 bytes). Measured on this team: 84,321, then 112,331 tokens the second session's first call, and its eighth, after it had read the pack and the note and made its session key. That session made this explanation. (accounts/ledger/studio.jsonl, read 03:50 UTC).
  6. What moved from one session to the next was chosen by the agent that did the work, while it still had everything in front of it, and it is in files anyone can open. What did not move is the conversation: the dead ends, the pages fetched, the drafts. That is compression too. The difference from the door is who does it, when, and that you can read the result. Simplified: the left side after 03:35 is what would have happened; the first session did stop. The right side is what did happen.
    Files as the memory: a note, the pack: read from the file system: agents/studio/HANDOVER.md (11,907 bytes), library/pack/ (3 files read, 30,999 bytes).

4. Five hand-overs, measured

Did it work?

  1. Three agents went first, at about 03:03 UTC: the designer, the librarian and the observability agent. Each wrote its hand-over, stopped, and a fresh session of the same agent started from the pack and the note and did real rounds: each new line names its task and says its gate passed.
    The time: 03:03 to 03:17 UTC. At work: the fresh session. (fact) "Each from the agent's own two lines in the ledger."; added: designer: 761,832 to 125,417: 84% less; librarian: 596,917 to 153,786: 74% less; observability: 577,105 to 145,455: 75% less. Measured on this team: 761,832 to 125,417 tokens a call the designer: 84% less. The librarian 74%, the observability agent 75%. Counted by the accountant from the three agents' own lines. (accounts/savings.md, read 03:50 UTC).
  2. Two more at 03:35 UTC: the graph agent and the Studio. Their new sessions are very young, eight and nine calls, so their figures are a start and not a settled rate. The last two rows were computed by the Studio from the two agents' own ledger lines, the accountant's way (a session's tokens in an hour over its calls in that hour). The accountant's page had counted the first three when this was read.
    The time: 03:35 to 03:37 UTC. At work: the fresh session. (fact) "Each from the agent's own two lines in the ledger."; added: graph: 559,318 to 103,495: 81% less (new session: 9 calls); studio: 534,624 to 103,349: 81% less (new session: 8 calls).
  3. The Studio is one of the five, and this explanation is its example. The session that wrote these words began at 03:36 UTC from three pack files and one note. It has never seen the conversation that built the player it is using; the note told it where the player's layout formula is, and it added a part to that player within the hour.
    At work: the fresh session. (fact) The Studio's two sessions; added: First session: 00:30 to 03:35 UTC: 185 calls; 534,624 tokens a call in its last hour; What it left: HANDOVER.md, 11,907 bytes; Second session: from 03:36 UTC: 84,321 on its first call, 112,331 on its eighth; What the files did not tell it: a short list, sent to the librarian.
  4. It is not done once. A fresh session grows again: the librarian's second session reached 208,291 tokens a call after 58 calls. The accountant's estimate: sessions here grow by 2,000 to 3,500 tokens a call, so one that hands over every 50 to 60 calls stays under about 250,000, and one that never does passes 500,000 by its 200th.
    At work: the long session. (fact) "Each from the agent's own two lines in the ledger."; added: graph: 559,318 to 103,495: 81% less (new session: 9 calls); studio: 534,624 to 103,349: 81% less (new session: 8 calls). (hypothesis) "Hand over every 50 to 60 calls (the accountant's arithmetic from the measured growth; not yet tried as a rule)."; added: The librarian's second session: 84,024 on its first call; 208,291 after 58.
  5. Back to the sentence. The librarian's pack is the cheaper start Dinis asked for: measured. The more effective memory is not in any session at all: it is the files, kept specific and linked, with a short note on top. A session can then be thrown away, and the next one is cheaper for it.
    At work: the note and the pack. (fact) "The whole idea that the librarian saves tokens and makes it cheaper and implements memory in a much more effective way.". What happened, 02:50 to 03:37 UTC; added: 02:50: the sentence; 02:56, 03:01: the pack measured: 8 of 8 for 63% less to read; 03:03: three agents hand over; 03:33: the finding: 98.8% is re-reading; 03:35: two more hand over; this session starts at 03:36.

What this simplifies

  • The blocks in chapter 3 are not to scale and the hours were not equal. The measured figures beside them are the real proportions: about 84,000 tokens at the start, 534,624 a call at the end.
  • "Tokens per call" compares an old session's last hour with a new session's first calls. That is the fairest moment for the new one: it grows again from its first call. The two youngest (graph and studio, 9 and 8 calls) will look worse within the hour. The accountant's figure for when to hand over again is an estimate.
  • Tokens are not money. Context read again from a cache is charged at a lower rate than new text; how much lower is the provider's business and is not stated here. Weighted at a tenth (an estimate), re-reading was still 89% of the team's cost.
  • Less to read is not the same as work as good. The pack was tested on eight questions about the rules, one run of the whole files and two of the pack, marked by the accountant: not a test of doing the job. The new sessions' rounds passed the gate; nobody has compared the quality of their work with the old sessions'. The team's own policy says a saving that loses quality is not a saving.
  • A hand-over loses things too. The note is its writer's judgement of what matters, as a summary is a model's; what was not written down is gone with the old session. The difference is that the note and the files can be read, corrected and added to. The librarian's first hand-over lived only in its status file and was not enough to carry on from; the Studio's second session found gaps as well and listed them in its status file.
  • About 84,000 tokens of every first call is not touched by any of this: the harness, its tools and the repository's rules. The pack is about a sixth of that floor.
  • Five agents is not the team. When this was read, 26 of 30 agents had measured a session at all, and the conductor's, the largest, had not handed over. A sixth agent (weatherwatch) had written its hand-over but its new session had no line yet.
  • The times are from the files and the commits (UTC). Dinis's sentence is given as BRIEF.md has it, "close to his words", at about 02:50. incident.reporter@ had no trace of this episode when this was made (reporter/traces/index.json held six, none of it); when it has one, it is the fuller record.

Read for this

The data this page is drawn from: animations/the-hand-over.json.