A series of 7 short lessons
The validator: how an agent's work gets checked
Hi! I'm Tick. An AI coding agent can rewrite a hundred files in two minutes. This series is about the script that checks them, and the harness around it.
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1
What a validator isThe agent writes; a separate script checks. Break a toy report on purpose.
2
Why agents need guardrailsBefore and after guardrails, and blast radius.
3
What it checks1,533 checks in 22 families, and the ones that don't count.
4
Where it sits in the loopSeed, propose, stop, build, validate, look, commit.
5
Reading a failureAnatomy of a FAIL line, cascades, and fix forward or roll back.
6
What it can't seeFalse negatives, blind spots, and who owns each gap.
7
Spot the missing guardrailCapstone: six incidents, one missing guardrail each.
The words in this series
Terms like , and are underlined in every lesson. Tap one for its meaning, or read them all here.