Make the compiler refuse your agent's type casts: a lint gate and a Zod boundary, built in 15 minutes

Sun, 08 Nov 2026 07:07:00 +0000

An agent is asked for a function that fetches an order from an internal API. It writes six tidy lines, the compiler is happy, the tests it wrote pass, and the diff looks like every other diff. The sixth line is return body as Order;, and that line is a promise the code can’t keep. The first time the API returns a quantity as a string, unitCount quietly returns "023" instead of 5 and the bug surfaces three services later.

Eslint on Tokenise

Make the compiler refuse your agent's type casts: a lint gate and a Zod boundary, built in 15 minutes