Moss

v0.73.0 Feature

This release adds 2 notable features for engineering teams evaluating rollout.

Published 1mo Editors & IDEs

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✓ No known CVEs patched

Read the diff → Tool health → What is this tool? →

✓ No known CVEs patched in this version

Topics

ai compiler language-server programming-language self-hosted

Summary

AI summary

Moss v0.73.0 is now GA and requires no Python; binaries provide a browser IDE and CLI.

Changes in this release

Type	Severity	Summary	CVE
Feature
Feature	Low	No Python required for Moss usage. No Python required for Moss usage. Source: llm_adapter@2026-06-11 Confidence: high	—
Feature	Low	Provides Moss Studio.exe as a double‑click browser IDE. Provides Moss Studio.exe as a double‑click browser IDE. Source: llm_adapter@2026-06-11 Confidence: high	—
Feature	Low	Includes moss.exe CLI for artifact, run, and selfhost‑run operations. Includes moss.exe CLI for artifact, run, and selfhost‑run operations. Source: llm_adapter@2026-06-11 Confidence: high	—
Feature	Low	Provides moss-lsp.exe as a VS Code Language Server Protocol server. Provides moss-lsp.exe as a VS Code Language Server Protocol server. Source: llm_adapter@2026-06-11 Confidence: high	—
Feature	Low	Introduces mossvm.exe, a zero‑dependency C VM (120 KB). Introduces mossvm.exe, a zero‑dependency C VM (120 KB). Source: llm_adapter@2026-06-11 Confidence: high	—
Feature	Low	Adds moss.bat launcher menu script. Adds moss.bat launcher menu script. Source: llm_adapter@2026-06-11 Confidence: high	—
Feature	Low	Verified equivalence between Python VM and C VM. Verified equivalence between Python VM and C VM. Source: llm_adapter@2026-06-11 Confidence: high	—
Performance	Medium	C VM size reduced to 120 KB with 40 builtins. C VM size reduced to 120 KB with 40 builtins. Source: llm_adapter@2026-06-11 Confidence: high	—
Bugfix	Medium	Parser achieves 100 % coverage with zero diff across all tests. Parser achieves 100 % coverage with zero diff across all tests. Source: llm_adapter@2026-06-11 Confidence: high	—
Bugfix	Medium	Compiler bootstrap passes successfully. Compiler bootstrap passes successfully. Source: llm_adapter@2026-06-11 Confidence: high	—

Full changelog

Moss v0.73.0 — Selfhost GA

No Python required. Download, unzip, double-click.

Package

| File | Size | Usage |
|------|------|-------|
| Moss Studio.exe | 9.1 MB | Double-click → browser IDE |
| moss.exe | 9.1 MB | CLI (artifact, run, selfhost-run) |
| moss-lsp.exe | 8.3 MB | VS Code LSP server |
| mossvm.exe | 120 KB | C VM (zero dependencies) |
| moss.bat | — | Launcher menu |

Quick start

Download → unzip → double-click Moss Studio.exe
→ browser opens → write code → Ctrl+Enter

# or terminal:
moss.exe artifact examples/order.moss
moss.exe selfhost-run examples/order.moss
moss.exe run hello.moss

Selfhost status

Parser 100% coverage, 9/9 zero diff. Compiler bootstrap PASS. C VM 40 builtins, 120KB. Python VM = C VM verified.

Verification

133 tests, 22 subtests. Selfhost 5/5. Selfhost-compare 9/9.

View diff on GitHub

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