Jac Toolchain is a developer platform for the Jac ecosystem focused on real authoring workflows.

• VS Code extension for Jac authoring
• Jac linter (CLI + editor diagnostics)
• Jac formatter (CLI + editor formatting provider)
• Jac playground webview
• Jac-to-Python transpiler with source-map output
• Debug launch integration for generated Python

• packages/jac-core: parser, linter, formatter, transpiler, diagnostics
• packages/jac-cli: command-line workflows (lint, format, transpile, doctor)
• packages/jac-vscode: extension commands, diagnostics, playground, debug launch
• scripts: build, package, and reliability proof automation

npm install
npm run build

Package extension:

npm run package:vscode

Run one command:

npm run proof:reliability

This verifies build health, fixture linting, formatter idempotence, diagnostic quality, and fallback-path stability.

• Demo narrative: docs/demo-script.md
• Reliability story: docs/reliability-proof.md
• Detailed toolchain guide: docs/toolchain-guide.md

• Native Jac tooling is used when available.
• Local fallback behavior is preserved so core workflows stay operational.