Sidequest: Shards, or Why a Part Gets a Fancier Name

Cold open

A shard is a part, yes. But it is a specific kind of part: one slice of a big pile, cut so that every slice is about the same size, no two slices overlap, and all of them together give you back the whole pile. "Part" says nothing about how the cutting was done. "Shard" is a promise that it was done on purpose.

So no, it is not only a fancier word. It is a fancier word with 3 rules attached.

How it came up

You were clearing forpar row 3, and the session went to check whether anything in your estate actually uses CassetteAI music generation. It searched your whole tools and projects tree for the name. What came back was not code. It was a list of files called shard 75, shard 76, shard 36 and so on, all in the about-par project's work folder.

The session shrugged them off as "chat-archive shards" and moved on, and it was right to. Those files are copies of things you once typed into a chat window. A hit there means you talked about CassetteAI at some point. It does not mean anything calls it. Nobody stopped to explain what a shard was, so you typed huh.

What these shards actually are

Back in June, the about-par project set out to build a profile of you from your own words. The raw material was chatarkiv, your archive of AI conversations. A small extraction script went through every conversation and kept only your side. Every Claude, ChatGPT and Codex reply was thrown away. What remained was more text than any single agent could read in one go.

So the script cut it into 130 pieces, and a workflow sent 130 agents out at once, one per piece, each told to read its whole file and pull out facts you had stated about yourself. Each piece is a shard.

Here are the 3 rules that make it a shard and not just a part.

Rule 1: conversations are never cut in half. The script treats each conversation as a brick. A brick goes into one shard whole. That matters because an agent reading half a conversation is exactly how you get the false facts listed in the project's extraction lessons, like the Scaleway Mac minis you supposedly rent, which were only discussed as an option and then dropped. You need the ending of a conversation to know what actually happened.

Rule 2: the shards are balanced by size, not by count. The script sorts conversations from biggest to smallest, then drops each one into whichever shard is currently lightest. Picture loading 130 moving boxes: big furniture first, then fill the gaps with lamps. The result is that almost every shard lands at about 180,000 characters, roughly 45,000 tokens. Shard 53, the one you asked about, holds 39 conversations. Shard 3 holds 24. Shard 0 holds exactly 1, a single monster conversation of more than 200,000 characters that could not share a box with anything. Same weight, very different counts.

Rule 3: together they are complete and they do not overlap. Every conversation lives in exactly one shard. That way, when 130 agents report back, you know the whole archive was read once, with nothing read twice and nothing skipped.

Why bother balancing at all

Because the agents run in parallel, the job is only done when the slowest one finishes. If you split by conversation count, one agent might get 40 short chats and another might get your 4 longest Codex marathons. The second one either takes forever or chokes on more text than it can hold. Balancing by size means every agent gets an equal reading load that fits comfortably in its head.

It also made the run survivable. Each agent writes its findings to a matching report, raw mining shard 53 sitting next to shard 53, and that report doubles as a checkpoint. When the run hit a usage limit partway through, re-firing it skipped the finished shards and only redid the missing ones. Losing one shard costs you one shard, not the whole run. The extraction lessons file records that this was learned the expensive way, with one crashed run of 8.75 million tokens.

Where the word comes from

The term is older than your estate. Databases have sharded for decades: when one table gets too big for one machine, you split the rows across several machines by some key, so each machine owns its slice and nobody owns the same row twice. Same 3 rules. The popular story is that the word itself came from Ultima Online in the late 90s, which explained its many parallel game servers as shards of a broken crystal. So yes, a database term with a fantasy-game origin story. Big tech took the lore and kept the billing.

The trap the session sidestepped

Here is the useful bit for your day job as the man who reads Claude's reports. Shards are copies. They duplicate a huge amount of your old conversation text, sitting on disk inside the projects tree. Any search for a tool name, a key name or a service will light up in that folder, because at some point you said the word out loud.

That is the "existence is not usage" rule in miniature. A hit in a shard is evidence that you talked about something, never that something uses it. The session filtered them out correctly this time. A future session that does not know what that folder is could easily report "CassetteAI is referenced in 8 places" and be technically true and practically wrong.

If you remember one thing: a shard is a part cut on purpose, whole conversations, equal weight, no overlap, so that 130 agents can each read one and the archive gets read exactly once.