I'm in the process of designing a .NET API to allow developers to create RoboCup agents for the 3D simulated soccer league.

I'm pretty happy with how the API work with C# code, however I would like to use this project to improve my F# skill (which is currently based on reading rather than practice).

So I would like to ask what kinds of things I should consider when designing an API that is to be consumed by both C# and F# code.

Some points.

• I make fairly heavy use of matrix and vector math. These are currently immutable classes/structs.
• The API currently defines a few interfaces with the consumer implements (eg: IAgent), using instances of their implementations (eg: MyAgent) to construct other API classes (eg: new Client(myAgent)).
• The API fires events.
• The API exposes a few delegate types.
• The API includes several enums.

I'd like to release a version of the API as soon as possible and don't want to make major changes to it later if I realise it's too difficult to work with from F#. Any advice is appreciated.