This repository contains the source and build pipeline for the Paper Mono monospace typeface, a derivative of Geist Mono. It uses GlyphsApp (.glyphspackage) as the primary design source and a standardized Google Fonts workflow (gftools builder) to generate static OTF/TTF and variable fonts, including WOFF2 web fonts. The project features extensive coding ligatures, box drawing characters, keyboard symbols, and stylistic alternates, targeting developers and designers. The build system is driven by a Makefile with targets for building, testing (via fontspector), and proof generation, all orchestrated via GitHub Actions CI. While the font design itself is the product, the build infrastructure (scripts/read-config.py, scripts/customize.py, Makefile) is well-structured and follows reusable patterns from the Google Fonts project template. The codebase is actively maintained, with pinned dependencies and a functional QA pipeline, though some fontspector failures indicate incomplete metadata and outline quality issues.