Vona is the Rust runtime layer for voice-native products: fast, provider-neutral speech-to-speech infrastructure with backend adapters, local model provisioning, deterministic interruption tests, and transport-ready session orchestration.
Vona owns the reusable runtime boundary: sessions, frames, tools, fallback decisions, and backend-neutral contracts. Your product owns the experience, policy, and deployment.
Step-oriented and event-stream voice interfaces give hosted realtime APIs, local STS models, and sidecar transports one coherent Rust boundary.
Measure time-to-first-audio, tool calls, interruption behavior, output frames after barge-in, and fallback decisions in tests before users discover the edge cases.
Run backends in-process, behind local HTTP, or over length-prefixed IPC without rewriting host application logic.
Skill registries, schema validation, audit events, and external context injection let voice systems coordinate with application tools while keeping runtime policy explicit.
Vona is designed for mixed reality: one app can explore local Moshi and Seamless-style paths, cloud realtime protocols, STT/TTS cascades, and sidecar deployments without hard-coding its future to a single provider.
Vona’s deterministic harnesses make the slippery parts of speech runtime behavior observable: event order, first audio, tool calls, interruption cleanup, fallback paths, and transport latency.
$ cargo run -p vona-test-harness --example mock_session --locked
session_id=mock-session-1
close_reason=BackendFinished
metrics time_to_first_audio_ms=Some(0) tool_calls=1 interruptions=1 fallback_count=0
output_frames_after_interruption=0
injected_events=1
$ bash scripts/release_gate.sh
[release-gate] Release gate PASSEDUse the umbrella crate for applications, then enable only the adapters you actually ship. Drop lower when you need direct crate boundaries.
[dependencies]
vona = { version = "0.1.0", features = [
"seamless",
"moshi",
"transport-local",
"openai-realtime",
"model-provisioning",
] }