Install

Install the iii engine and set up your development environment.

1. Install iii

Install the iii engine:

curl -fsSL https://install.iii.dev/iii/main/install.sh | sh

2. Verify installation

Check that iii has installed correctly with the following command. It should return a version number.

iii --version

The engine and SDK packages can have different patch versions within the same minor line. Keep the engine and SDKs on the same minor version, for example 0.11.x, unless a release note says otherwise.

3. Install the VS Code Extension (Optional)

The iii Language Server extension gives your editor live awareness of your iii project:

• Completions — function IDs, trigger types, payload properties, and known values like stream names and API paths.
• Hover documentation — request and response schemas for any registered function.
• Diagnostics — validates function IDs, required payload fields, trigger configs, cron expressions, and HTTP methods as you type.

Works with TypeScript, Python, and Rust files. Requires a running iii engine.

VS Code / Cursor

Open the Extensions panel and search for iii-lsp, or install from the terminal:

code --install-extension iii-hq.iii-lsp

For Cursor, replace code with cursor.

4. Add Agent Skills (Optional)

Give your IDEs and AI coding agents full context on iii:

npx skillkit add iii-hq/iii/skills

Next Steps

Quickstart

Follow the Quickstart and explore a live iii application.

Concepts

Understand Functions and Triggers from a conceptual point of view.