Edit an existing plan

Change a .arch file without breaking what already works. If archlang is not on the path, write npx -y @chanmeng666/archlang in its place. Never run a bare arch: on Linux, macOS and Git Bash that name is the coreutils command.

This skill is a workflow, not a language reference. Run archlang spec for the language and archlang <cmd> --help for a command's flags.

Scope

• Run the archlang CLI commands below and no other program.
• Change the one .arch file the user asked you to edit (plan.arch below). If the user has not named it, ask. Besides it, write only the drawing the CLI renders and the .bak copy that --backup keeps.
• The user's explicit instructions take priority over these steps.

Steps