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Antron

Chiron — Χείρων — was the centaur they sent their children to be taught by. Where the rest of his kin were violent and drunk, he taught medicine, music, astronomy and the honest arts; Achilles, Jason and Asclepius were all raised by him. He did it in a cave on Mount Pelion, and the Greek for that cave is ἄντρον, antron.

Chiron is the teacher. Antron is the cave he taught in.

Chiron is a working application. It drafts practice questions for hard certification exams from public-domain source texts, a human reads every one against the passage it came from before it can be served, and learners drill the approved bank with the citation in front of them.

Antron is where the method is set out in the open: what a question carries, how it is classified, what is checked before it ships, and what the application stores about the people who use it.

The short version

Machine-generated exam questions have an obvious failure mode. A language model will produce a fluent, plausible, confidently wrong question all day, and volume makes that worse rather than better. Chiron's answer is not "a better model." It is a stack of constraints, each closing a specific failure:

Constraint	The failure it closes
Public-domain sources only	No question rests on material that cannot be cited or checked
Every question grounded in a verbatim passage	The source text is the authority, not the model's assertion
A declared pedagogical goal before drafting	Questions that test nothing in particular never get written
Three-way cognitive classification	"This is mere recall" becomes data rather than opinion
Wrong answers classified too	A wrong answer names a misconception instead of being merely wrong
A human approves every question	Nothing reaches a learner on a machine's say-so

None of those alone is sufficient. Can You Trust These Questions? sets out what the stack does and does not establish, including what has never been measured.

The exams

Domain	Prepares you for	How its questions are made
Patent Agent	The USPTO patent bar exam	Generated from the MPEP and related public sources, then curated
AIGP	The IAPP AI Governance Professional certification	Generated from the IAPP-specified public frameworks, then curated
Amateur Radio	The FCC Technician / General / Amateur Extra licences	Loaded verbatim from the public NCVEC question pools — no generation

Where to go next

• How Chiron Works — the factory, the curation loop, and the two kinds of domain.
• How Questions Are Classified — Bloom, Depth of Knowledge, and SOLO, and why the wrong answers are graded too.
• Security and Privacy — how every route is gated, and what is stored about you.
• What Antron Withholds — what is deliberately not published here, and why.

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Chiron is also a proof point: it was built end to end by AssemblyZero, an AI-native software factory. It is real, working software produced by that factory.