---
id: trinity-bill
kind: project
title: "Trinity (BILL)"
org_label: "BILL"
maturity: "invested"
project_kind: "design-system"
url: "https://www.bill.com/engineering/how-we-made-our-design-system-bilingual"
atlas_url: https://designsystems.fly.dev/nodes/trinity-bill.md
---

# Trinity (BILL)

Storybook as source of truth, a CLI emitting component APIs and tokens as JSON, a hosted MCP server, and compliance skills. Reports 31-63% token savings.

## Edges

- holds -> Compile them. Hand-written agent docs rot; generated ones cannot drift., Yes. Instructions tell an agent the rules; only running it says whether it followed them.
- maintained_by -> BILL
- ships -> Agent skills, Compiled, not written, context, Evals for design systems, MCP servers

## Sources

- https://www.bill.com/engineering/how-we-made-our-design-system-bilingual