Monorepo Agent-Consumable Documentation System

Solo-built documentation system for a large TypeScript monorepo, with deterministic integrity checks enforced in CI so the docs cannot silently drift from the code they describe.

The problem

Documentation in a fast-moving monorepo rots the same way everywhere: it is accurate the day it is written and stale within a quarter, because nothing forces it to stay in sync with the code. This started as a complaint I kept making in reviews before I decided to fix it instead.

What I built

A documentation system for the monorepo, designed to be consumed by both engineers and coding agents, with deterministic integrity gates wired into CI — a doc that references a file, export or command that no longer exists fails the build the same way a broken type does. I built it solo, on top of the existing Turborepo/pnpm workspace tooling, and it now covers the shared packages and services across the monorepo.

Why it mattered

It changed how the team onboards: a new engineer or agent landing on an unfamiliar part of the codebase can trust the docs instead of double-checking them against the source, because CI rejects a doc the moment it drifts. I never instrumented onboarding time, so the claim here is the mechanism, not a number. It is also the clearest example I have of a self-directed improvement that turned into standing infrastructure rather than a one-off cleanup.