Tooling

Keel provides a comprehensive set of development tools.

Core Tools

Tool	Description
CLI	Unified command-line interface (`keel run`, `keel repl`, `keel fmt`, `keel lsp`)
REPL	Interactive environment
Language Server	IDE features and editor setup
Jupyter Kernel	Interactive notebooks

Editor	Syntax Highlighting	LSP Features	Plugin/Extension
VS Code	TextMate + tree-sitter	Full LSP	keel-vscode
Positron	TextMate + tree-sitter	Full LSP + data explorer, variable pane	keel-vscode
Helix	tree-sitter	Full LSP	Built-in config
Zed	tree-sitter	Format on save, auto-indent, symbol nav	keel-zed-extension
Neovim	tree-sitter	Full LSP	Manual config
Jupyter	Optional extension	Completion, hover	keel-jupyter-kernel
Emacs	Planned	Planned	Coming soon

See the Language Server & Editor Setup guide for configuration instructions.

The Keel Language Server (keel-lsp) provides IDE features:

Diagnostics — Real-time lex and parse error reporting
Completion — Variables, functions, enums, modules, keywords, with dot-completion for module members
Advanced completions — File paths, pattern matching, imports, record fields, type annotations, dict keys
Go-to-definition — Jump to symbol declarations
Find references — Locate all occurrences of a symbol
Rename — Rename a symbol and all its references
Hover — Type signatures, documentation with examples, doc comments
Signature help — Parameter information when calling functions
Semantic tokens — Parser-driven syntax highlighting
Code lens — Reference counts above declarations
Document symbols — Outline of functions, enums, modules
Workspace symbols — Search across all files
Folding ranges — Collapsible code regions

The keel-tree-sitter grammar provides syntax highlighting for:

Tool	Description
Formatter	Code formatting
Testing	Test framework (planned)
IO Security	File system and network access control
Package Manager	Dependency management (planned)