# Upstream Dependencies

## Portal
- Next.js
- Axios
- Websocket console
- Multipart FormData upload

## API
- Node.js (ESM)
- Express
- Raw http.request for upload proxy
- Prisma
- Token auth

## Agent
- Go
- Runtime root sandboxing
- Atomic file writes
- Metadata tracking
- Shadow backup system

No external reverse proxy required for internal upload.

---

## zlh-artifacts (Artifact Server)

Role:
Central artifact distribution for runtime and addon installs.

Artifacts currently hosted:

```
devcontainer/
  _catalog.json
  go/
  node/
  python/
  java/
  dotnet/

addons/
  code-server/
```

Used by: zlh-agent

Artifacts are downloaded during provisioning using:

```
provcommon.BuildArtifactURL(...)
```

Containers do not rely on prepositioned artifacts.