Keel Language — VS Code Extension

Syntax highlighting, snippets, and language server support for Keel — a programming language where AI agents are first-class citizens.

Features

Syntax highlighting — reserved keywords, prelude namespaces (Ai, Io, Schedule, …), attributes (@on_start, @role, …), duration literals, string interpolation
Snippets — agent, task, type, interface, @on_start, when, try, and more
Language server — diagnostics, go-to-definition, rename (requires keel binary on PATH)
Commands — Keel: Run File, Keel: Check File, Keel: Lint File, Keel: Format File
Format on save — delegates to keel fmt

Install the keel CLI:

curl -fsSL https://keel-lang.dev/install.sh | sh
# or
brew install keel-lang/tap/keel

Setting	Default	Description
`keel.executablePath`	`"keel"`	Path to the keel binary
`keel.lsp.enabled`	`true`	Enable the language server
`keel.trace.server`	`"off"`	LSP trace level (`off` / `messages` / `verbose`)

Add to your VS Code settings:

{
  "[keel]": {
    "editor.formatOnSave": true,
    "editor.defaultFormatter": "keel-lang.keel-lang"
  }
}