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Lex is the AI inside contracts.io. It has a name because it does a specific job with specific limits, and a thing with limits should be nameable.
Lex is designed, not shipped. Nothing past the door’s gate exists yet: there is no account to sign into and no room for Lex to work in. What is on this page is the settled design and the standing limits, written down before it is built so the limits are on record first. Nothing here is a claim about a date.

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What Lex is for

  • Drafting. You describe the deal; Lex writes the contract, clause by clause, in plain language and in the order a contract is read.
  • Proposing. Select a clause, say what you want changed, and Lex writes the change as a proposal you look at before it goes anywhere.
  • Explaining. Ask what a clause means and Lex answers in the words you would use out loud, not in section numbers.
Every one of those ends in something you read and press. The loop is the same throughout: select, instruct, propose, accept, new words.

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The limits, which are the point

It never sends

Send-class work stops and asks a person to confirm. There is no flag, key, setting or permission level that removes this.

It never signs

A signature is a person putting their name to a specific set of words. Lex cannot make one and is not asked to.
Two more rules hold the rest of it up:
  • Lex reads what your seat can read, and nothing more. The other side’s unsent reply, their staged decisions, their notes and their own Lex transcript are not readable — not summarisable, not countable, not hinted at.
  • Lex stages through the store the buttons use. There is no parallel “AI suggestion” tray. A counter Lex staged is a staged counter, attributed to a person, and it appears on the paper the same way a typed one does.
Lex does not give legal advice, and the product does not imply that it does. It makes paper.

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”Found”, never “read”

Lex reports. It does not interpret, and it does not claim comprehension it cannot demonstrate.
The difference is not politeness. “Found” is a checkable claim about a file listing; “read and understood” is a claim about a mind, and it is the exact sentence that makes people trust a tool further than it has earned.

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Lex does not run at the door

The homepage is open to the world and nobody is signed in on it, so no model call happens there. The door holds your sentence and waits. Press send and you meet this, rather than a draft:
Sign in to let Lex work on this. Nothing has been sent and nothing has run. The model only ever reads your words once there is an account for the work to belong to.

What the door actually does

One field, three controls, and a gate.