-**Model**: Claude Opus 4.6
+# Tulpen One — Upstream Source Investigation
-## Tulpen One
+**Model**: Claude Opus 4.6
+**Date**: 2026-03-25
+**Investigator**: AI agent (Claude) under guidance of @felipesanches
**Designer**: Naima Ben Ayed
-### Upstream Repository Search
+## Source Repository
+
+Source files were found in the **googlefontdirectory-hg** monorepo at commit `52f780bc9d197280a9f430574e179a5f233c56b6`, under the path `tulpenone/src/`.
+
+### Source Files
+
+- **SFD (FontForge)**: TulpenOne-Regular-TTF.sfd
+- **TTF (compiled)**: Tulpen-Light.ttf
+
+Sources are in SFD format (FontForge), which is not buildable with gftools-builder.
+
+## Investigation Details
Tulpen One was designed by Naima Ben Ayed (naima.benayed@gmail.com). The font is a tall sans-serif display typeface.
2. **Repository name search**: Searches for "tulpen", "tulpen one", and "tulpenone" on GitHub returned no font source repositories.
3. **Broader searches**: No relevant repositories were found using designer name and font name combinations.
-### Status
-
-No canonical upstream repository was found for Tulpen One. No source block was added to `METADATA.pb`.
-
-### Conclusion
-
Tulpen One appears to have been contributed to Google Fonts without a corresponding public source repository. The font was released in 2011 and the sources have not been made publicly available on GitHub or any other discoverable platform.