Node libraries

Canvas script nodes are useful for experiments. For reusable logic, device calls, or existing .NET code, write a node library: a regular C# class library whose public methods become canvas nodes.

Write C# library → Publish and ZIP → Upload → Add to project → Use on canvas

Where to start

1. Your first node: build, upload, and reference a calculation method.
2. Node contracts: labels, parameters, and execution behavior.
3. Register services: share an object among nodes.
4. Built-in services: messages, files, and run context.
5. Load native DLLs: use platform-specific dependencies.
6. Package and upload: ZIP layout and troubleshooting.

Three places to keep distinct

Place	Responsibility
Your node library	[FlowLibrary], [FlowNode], [FlowService], and bundled dependencies.
SereinFlow host	Stores projects, exposes HTTP endpoints, and starts Workers. See Integration.
Running Worker	Creates node instances and provides messages, file output, and native loading for a run.

A node constructor can receive Worker-provided services and services registered with [FlowService] in the same uploaded assembly. Host services are not automatically available inside nodes.