Nexa Goes Open Source — v0.9-alpha Release

Today, we’re opening the doors. After two months of intense development, Nexa v0.9-alpha is now open source under the GNU Affero General Public License v3.0 (AGPL-3.0).

Why AGPL-3.0?

We chose AGPL-3.0 deliberately. As an agent programming language, Nexa sits at the intersection of AI safety and developer freedom. AGPL-3.0 ensures that:

All modifications remain open — if someone improves the Nexa compiler, those improvements must be shared back
Network use is covered — unlike GPL, AGPL covers software accessed over a network (critical for agent services)
Commercial use is allowed — companies can build products with Nexa; they just can’t close-source the compiler itself

What’s in v0.9-alpha?

This first public release includes:

Working transpiler: Lark-based parser → AST transformer → Python code generator
10+ example programs: Hello World, Pipeline & Routing, Critic Loop, Join Consensus, Tool Execution, Sys Admin Bot, Modules & Secrets, News Aggregator, Cognitive Architecture, Skill Markdown
Core runtime: Agent execution, memory management, tool registry, semantic evaluation, intent routing
CLI tool: nexa build, nexa run, nexa test, nexa serve
Documentation: Syntax reference, compiler architecture, roadmap, quick start guide

Getting Started in 30 Seconds

# Install
pip install nexa

# Create your first agent
cat > hello.nx << 'EOF'
agent Greeter {
    prompt: "Greet the user warmly."
}
flow main {
    result = Greeter.run("Hello!");
    print(result);
}
EOF

# Run it
nexa run hello.nx

Community Response

Within the first week of release, we’ve seen:

500+ GitHub stars — validating the demand for an agent-native language
30+ issues and PRs — early adopters contributing bug fixes and feature suggestions
Active discussions on Hacker News and Reddit’s r/ProgrammingLanguages
First external contributor — someone added MCP (Model Context Protocol) tool support

The Road Ahead

v0.9-alpha is just the beginning. Our roadmap for the coming months:

v1.0: Stable transpiler, comprehensive testing, production-ready runtime
v1.1: Intent-Driven Development (IDD) — .nxintent files and IAL engine
v1.2: Design by Contract (DbC) — requires/ensures/invariant
v1.3: Agent-Native Tooling — nexa inspect/validate/lint

We’re also beginning work on the Rust AVM (Agent Virtual Machine) — a high-performance runtime with WASM sandboxing that will eventually replace the Python transpiler backend for production deployments.

— Owen, March 2026