here-be-dragons: turn any git repo into a fantasy map

Old cartographers drew dragons where the known world ended. Your codebase has dragons too: the files that are complex and keep changing, where bugs breed. here-be-dragons reads your git history and draws them, along with the roads between files that secretly change together, the ruins left when authors move on, and the land forged by AI agents.

The Atlas of Famous Realms

Every map below is interactive. Zoom in, hover a settlement, meet the dragons.

reactfacebook/react

7,005 settlements · 19k commits · 10 dragons

🐉 Tyrlith the Unfinished
packages/react-devtools-shared/src/backend/fiber/renderer.js

vuejsvuejs/core

644 settlements · 7,186 commits · 7 dragons

🐉 Drakesh the Restless
packages/runtime-core/src/renderer.ts

djangodjango/django

3,615 settlements · 34k commits · 10 dragons

🐉 Ashiphyr the Colossal
django/db/models/sql/query.py

railsrails/rails

4,460 settlements · 60k commits · 10 dragons

🐉 Rhamir the Restless
actionpack/lib/action_dispatch/routing/mapper.rb

sveltesveltejs/svelte

9,152 settlements · 9,890 commits · 7 dragons

🐉 Vexygarde the Tangled
packages/svelte/src/compiler/phases/2-analyze/index.js

vitevitejs/vite

2,528 settlements · 9,704 commits · 7 dragons

🐉 Korulith the Colossal
packages/vite/src/node/plugins/css.ts

tailwindcsstailwindlabs/tailwindcss

516 settlements · 6,057 commits · 6 dragons

🐉 Ignekesh the Restless
packages/tailwindcss/src/utilities.ts

fastapifastapi/fastapi

2,747 settlements · 7,780 commits · 3 dragons

🐉 Zyruzar the Restless
fastapi/routing.py

expressexpressjs/express

198 settlements · 5,696 commits · 3 dragons

🐉 Azythas the Restless
lib/response.js

flaskpallets/flask

217 settlements · 3,829 commits · 2 dragons

🐉 Sylygarde the Restless
src/flask/sansio/app.py

zodcolinhacks/zod

632 settlements · 2,929 commits · 6 dragons

🐉 Sylokesh the Restless
packages/zod/src/v3/types.ts

How to read a map

Every mark is computed from your repository. Nothing is decoration.

🐉 Dragons

Hotspots: complex code that changes often. Defects concentrate here.

⛰ Mountains

Deeply nested code.

🌲 Ancient forests

Code untouched for two years or more.

🏰 Castles & towns

The biggest and busiest files.

🧱 Walls

The file has a matching test file.

🛤 Roads

Files that keep changing in the same commits: hidden dependencies.

🏚 Ruins

Code whose main author has not committed in six months.

▨ Hatched land

Lines written in commits signed by AI coding agents.

🛡 Great Houses

Who wrote most of each part of the realm.

For you, and for your agents

Your coding agent should know where the dragons are before it touches your code.

# draw your realm
npx here-be-dragons

# any public GitHub repository
npx here-be-dragons facebook/react

# keep a map in your README
npx here-be-dragons --svg .github/realm.svg

# teach your agent (Claude Code, Codex, Cursor…)
npx skills add rodrigoguedes09/here-be-dragons

# or hand it the survey directly
npx here-be-dragons --json