navi-plugin-runtime 0.3.7

Local agentic engine and terminal-first coding agent.
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navi-plugin-runtime

Crates.io License

WASM plugin runtime for NAVI, powered by Wasmtime.

navi-plugin-runtime executes WASM plugin components in a sandboxed environment with host callbacks for tool invocation, filesystem access, and HTTP requests.

What's inside

Module Purpose
runtime PluginRuntime — loads and executes WASM components with host callbacks
component Component kind detection (command, reactor, etc.)
wit WIT (WebAssembly Interface Types) integration
error RuntimeError types for WASM execution failures

Host callbacks

WASM plugins communicate with the host through a HostCallbacks interface:

pub struct HostCallbacks {
    pub log: Box<dyn Fn(&str) + Send + Sync>,
    pub tool_call: Box<dyn Fn(&str, Value) -> Result<Value, String> + Send + Sync>,
}

Sandbox

WASM plugins run in Wasmtime's built-in sandbox:

  • No direct filesystem access (must go through host callbacks)
  • No network access (must go through host callbacks)
  • Memory limits enforced by the WASM runtime
  • CPU limits via fuel consumption metering

Part of the NAVI workspace

This crate depends on wasmtime.

Full project: https://github.com/navi-ai-org/navi License: Apache-2.0