ai-ui-core

Rust port of @assistant-ui/core: the thread message model (upstream JSON shape, unknown fields round-trip), the branching MessageRepository, the ChatModelAdapter contract, the ThreadRuntime trait with LocalThreadRuntime and ExternalStoreRuntime, ThreadList, frontend tools with approvals, composers and SmoothText.

use ai_ui_core::{adapter, AppendMessage, ChatModelRunResult, LocalRuntimeOptions, LocalThreadRuntime, ThreadRuntime};

let runtime = LocalThreadRuntime::new(
    |_options| adapter::from_results([Ok(ChatModelRunResult::text("Hello!"))]),
    LocalRuntimeOptions::default(),
);
let run = runtime.append(AppendMessage::user_text(None, "Hi"))?;
// Spawn `run` on any executor: slint::spawn_local, a Tokio LocalSet, wasm-bindgen-futures...
# Ok::<(), ai_ui_core::RuntimeError>(())

No I/O, UI, clock or randomness dependencies; builds for wasm32-unknown-unknown. Runtimes are Rc-based (single-threaded, like a UI thread).

Part of assistant-ui for Rust, a port of assistant-ui (MIT). Not affiliated with the assistant-ui project. Status and gaps: docs/STATUS.md.