Osy#the first language built for agents
Agents firstAgentic appsWorkflowsDurable Execution — built inSecurityTestingThe editorThe UI modelOne program

Guides

One subject each, top to bottom. The reference answers what does this construct do; these answer how does this part of the system work, and every example in them is a real file out of a real app.

Agents first

Ask the compiler, not the codebase — and a wrong guess that cannot reach the data.

Agentic apps

Declaring one, streaming its answer, parking it on a person.

Workflows

State, events, slots, and runs that outlive the code that started them.

Durable Execution — built in

Why it matters, what gets a step, and the saga when once is not enough.

Security

Default-deny, row filters, field masks — and why you never check one.

Testing

Real app, real rules, own database — and a tier that sees pixels.

The editor

The language server, the side gutter, and a debugger across the seam.

The UI model

Reactivity, layout as arguments, and one theme in two modes.

One program

You do not place code. The compiler does, from what each line touches.