DomainLang

Define your domains, bounded contexts, context maps, and team ownership in a concise .dlang syntax — with full editor support in VS Code.

DomainLang brings Domain-Driven Design modeling into your editor. You get syntax highlighting, IntelliSense, real-time validation, formatting, and navigation features that make .dlang files feel like first-class citizens alongside your code.

Get started in two minutes

Install the extension from the VS Code Marketplace.
Create a file with a .dlang extension.
Start modeling:

Domain Commerce {
  vision: "Deliver seamless customer buying experiences"
}

Team SalesTeam
Team PaymentsTeam
Classification Core

bc OrderContext for Commerce as Core by SalesTeam {
  description: "Owns the order lifecycle"
}

bc PaymentContext for Commerce as Core by PaymentsTeam {
  description: "Owns payment authorization and capture"
}

ContextMap CommerceMap {
  contains OrderContext, PaymentContext
  [OHS] OrderContext -> [ACL] PaymentContext
}

As you type, DomainLang validates your model, auto-completes references, and shows inline documentation on hover. Formatting keeps your models consistent, and go-to-definition lets you navigate large models instantly.

Editor features

Syntax highlighting for .dlang files
IntelliSense with keyword and cross-reference completion
Real-time validation with actionable diagnostics
Hover documentation for every element
Go to definition and find references
Document formatting
Syntax highlighting in Markdown fenced code blocks

AI tools for Copilot and agents

The extension exposes four language model tools that any VS Code agent can call:

Tool	What it does
`domainlang_validate`	Validate a model or workspace and return diagnostics
`domainlang_list`	List and filter domains, bounded contexts, teams, and more
`domainlang_get`	Retrieve element details or a high-level model summary
`domainlang_explain`	Get a rich Markdown explanation of any element by FQN

Try these prompts with Copilot Chat:

"Validate my DomainLang model."
"List all bounded contexts owned by PaymentsTeam."
"Explain Acme.Sales.OrderContext."

Extension settings

Setting	Default	Description
`domainlang.lsp.traceImports`	`false`	Log detailed import resolution traces in language server output
`domainlang.lsp.infoLogs`	`false`	Log info-level messages and timing in language server output

Requirements

VS Code 1.109.0 or later.

Documentation

Feedback and issues

Found a bug or have a feature idea? Open an issue on GitHub.

License

Apache-2.0