# Yohei Nakajima — Build Log

> A public, chronological archive of Yohei Nakajima's AI agents, open-source software, developer tools, venture experiments, economics research, art, and other builds.

Canonical site: https://yohei.me/
Author: Yohei Nakajima
Language: English
Public project count: 121
Coverage: 2020–2026
Last data refresh: 2026-07-22

## Start here

- [Build log](https://yohei.me/): Human-readable site with featured work and the chronological archive.
- [Project data manifest](https://yohei.me/data/manifest.json): Lists all year-partitioned public JSON files.
- [Atom feed](https://yohei.me/feed.xml): Latest public projects.
- [Sitemap](https://yohei.me/sitemap.xml): Canonical discovery URLs.

## Featured work

- [ActiveGraph](https://activegraph.ai): Event-sourced reactive graph runtime for auditable, forkable, long-running agents.
  - [Documentation](https://docs.activegraph.ai)
  - [GitHub](https://github.com/yoheinakajima/activegraph)
  - [Launch post](https://x.com/yoheinakajima/status/2057099245430222926)
- [The Shared Discovery Paradox paper](https://arxiv.org/abs/2607.18045): A mathematical explanation of how information sharing without action coordination can worsen group outcomes.
  - [GitHub](https://github.com/yoheinakajima/shared-discovery-paradox)
  - [Launch post](https://x.com/yoheinakajima/status/2079567881889796456?s=20)

## Upcoming / current media

- [ActiveGraph at AI Engineer World's Fair](https://www.youtube.com/watch?v=khVX_BUnEwU): Now available on YouTube; published July 22, 2026 at 10:00 AM Pacific Time.

## Public project data

Each JSON record contains an ID, name, short description, date, source URL, public type labels, formats, and categories. Featured records may also contain ranked resource links.

- [2026 projects](https://yohei.me/data/projects-2026.json)
- [2025 projects](https://yohei.me/data/projects-2025.json)
- [2024 projects](https://yohei.me/data/projects-2024.json)
- [2023 projects](https://yohei.me/data/projects-2023.json)
- [2022 projects](https://yohei.me/data/projects-2022.json)
- [2021 projects](https://yohei.me/data/projects-2021.json)
- [2020 projects](https://yohei.me/data/projects-2020.json)

## Identity and related links

- [GitHub profile](https://github.com/yoheinakajima)
- [X profile](https://x.com/yoheinakajima)
- [Untapped Capital](https://untapped.vc)

## Data policy

Only Airtable records explicitly tagged public are included. Private records are excluded from the repository and browser payload. The checked-in JSON files are the canonical data source for this static site.