cmux-custom-sidebar

# cmux Custom Sidebar cmux renders custom sidebars from a small SwiftUI-style file at runtime: no Xcode, no build step, no signing. The file hot-reloads on save, binds to live cmux state (workspaces, tabs, git, PRs, clock), and runs real cmux commands on tap. The person asking is describing a result ("a sidebar that shows my workspaces and lets me jump between them"), not an implementation. Make the engineering decisions for them; do not ask them about SwiftUI, files, or syntax. This skill is the workflow summary. Read the complete authoring contract (every supported view, modifier, language feature, and data field) before writing a non-trivial sidebar: ```bash cmux docs sidebars curl -fsSL https://raw.githubusercontent.com/manaflow-ai/cmux/main/docs/custom-sidebars.md ``` ## Workflow 1. **Enable the beta** (once): Settings > Beta features > Custom sidebars (`customSidebars.beta.enabled`). If a written sidebar does not appear in the picker, check this first. 2. **Write a named file** at `~/.config/cmux/sidebars/<name>.swift`. The name becomes the menu label; use short kebab-case. The file is a single SwiftUI-style view expression (no `struct`, no `var body`, no imports). A `.json` variant exists for static layouts; prefer `.swift` for anything dynamic. 3. **Validate and select:** ```bash cmux sidebar validate <name> # parse/interpret check with real data shapes cmux sidebar select <name> ``` The user can also right-click the sidebar toggle button to pic...