What is DevMatrix
DevMatrix is a compiler for complete systems. You
describe the system in DMX, its specification language, and DevMatrix
deterministically compiles it into production code, tests, migrations,
infrastructure and evidence. Same spec in, same artifacts out, every run.
- Bring your own model for authoring. Claude, Codex, Cursor or your own
model helps you write the spec. Compilation itself calls no model.
- Production output. Services, database schema and migrations, access
policies, contract and security tests, and the infrastructure to run them.
- Evidence with every build. A software bill of materials and a signed
certificate that lets anyone replay the build and check the result.
- You own the code.
What this extension does
This extension brings the DevMatrix Workshop into VS Code (and editors that
install from Open VSX): it understands DMX, validates it against your
DevMatrix account, and opens your platform specs and wikis as ordinary editor
documents.
You need a DevMatrix account and a Workshop API key to use the online
features. Editing .dmx files locally (highlighting, completion, snippets)
works without signing in.
Install
- VS Code: search for DevMatrix in the Extensions view, or visit the
Visual Studio Marketplace.
- Cursor, VSCodium, Windsurf and other Open VSX editors: search for
DevMatrix in the Extensions view, or visit
Open VSX.
Features
The DMX language
- Syntax highlighting for the whole language: blocks, data types,
annotations,
$-tokens, flow actions and triggers.
- Completion for blocks, annotations (
@…), $-tokens, flow actions,
trigger templates and HTTP methods, with snippets ready to fill in.
- Descriptions on hover for keywords and annotations.
- The DevMatrix Dark theme, auto-indent, bracket matching and comment
toggling.
Validation
- On save or on demand: the spec is checked against the DMX grammar.
- As you type (optional): the DevMatrix backend runs its semantic checks
and the results appear in the Problems panel.
Your Workshop in the editor
- Browse the platforms your key can reach in the DevMatrix view of the
activity bar.
- Open
.dmx specs as editor documents; saving stores a new version in
DevMatrix. Compare a spec with its previous version and browse its history.
- Read platform wikis and upload new versions.
- Mark a spec compilable, open the DMX language reference, and open the
Workshop in your browser.
- Optionally register the DevMatrix MCP server for Claude Code in the current
workspace (DevMatrix: Connect Claude Code (MCP)). Claude Code signs you
in to DevMatrix in your browser the first time it connects (OAuth); your
Workshop key is not used for it.
Getting started
- Install the extension.
- Open the DevMatrix view in the activity bar and select Sign in.
- Paste your Workshop API key (
dm_live_…). You can create one in the
DevMatrix Workshop under Settings → API Keys, or with
DevMatrix: Manage Workshop Keys (web).
- Your platforms appear in the view. Open a spec, edit it and save.
A Workshop key can read and author specs and wikis. It cannot start a
compilation.
Settings
| Setting |
Default |
Description |
devmatrix.apiBaseUrl |
https://devmatrix.dev |
DevMatrix backend the extension connects to. Only https is accepted. User settings only. |
devmatrix.deepValidate.enabled |
true |
Validate the open spec as you type. |
devmatrix.deepValidate.debounceMs |
800 |
Pause, in milliseconds, before an as-you-type validation request. |
devmatrix.mcpUrl |
(derived) |
MCP gateway used by Connect Claude Code. Empty means it is derived from devmatrix.apiBaseUrl. Only https is accepted. User settings only. |
In an untrusted workspace the extension runs in restricted mode: the backend
and MCP addresses can only come from your user settings.
Requirements
- VS Code 1.90 or later, or a compatible editor.
- A DevMatrix account and a Workshop API key for the online features.
Data and privacy
The extension sends data only to the DevMatrix backend set in
devmatrix.apiBaseUrl (by default https://devmatrix.dev), and only to
do what you ask:
| What is sent |
When |
Why |
| Your Workshop API key, in the request header |
Every request after you sign in |
To authenticate you |
| The text of the spec you are editing |
When you validate, save, or type with as-you-type validation on |
To validate and store it |
| Wiki documents you upload |
When you upload |
To store them |
| Requests for your platforms, specs, versions and wikis |
When you browse or open them |
To show them |
- The key is stored by VS Code's SecretStorage (your operating system's
keychain), separately for each backend address. It is never written to
settings or files and never logged.
- Connect Claude Code writes a
.mcp.json file to the workspace that
names the DevMatrix MCP gateway (by default https://mcp.devmatrix.dev/mcp)
and nothing else: no key and no credential. Claude Code connects to that
gateway itself and signs you in with OAuth in your browser; the extension
does not connect to it and does not share your Workshop key with it.
- The extension collects no telemetry and sends nothing to third parties.
Read the full Privacy policy.
Support
License
Proprietary. See the LICENSE file included with the extension. Third-party
components are listed with their licenses in ThirdPartyNotices.txt, also
included with the extension.
Trademarks
Claude and Claude Code are trademarks of Anthropic, PBC. Visual Studio Code is
a trademark of Microsoft Corporation. Other product names mentioned here are
trademarks of their respective owners. They are named only to say what this
extension works with; DevMatrix is not affiliated with or endorsed by any of
them.
© 2026 DevMatrix Inc. All rights reserved.
