Everything on this page also lives in the full Learn guide — this is the print-and-pin version.
Remember three things
Shortcuts
| Shortcut | Does |
|---|---|
Ctrl+Shift+P | Command Palette |
Ctrl+P | Quick Open a file |
Ctrl+Esc | Switch editor ↔ Claude |
Ctrl+Shift+Esc | Claude in a new tab |
Alt+K | Send selected lines to Claude |
Shift+Enter | New line in your prompt |
Ctrl+` | Open the terminal |
Ctrl+S | Save (or turn on Auto Save) |
Safety rules
Starts with mk_. Leaked? Ask Claude to regenerate it.
Archiving is reversible. Deleting is not.
Especially deletes, deploys, settings changes.
Styling/images can look old briefly after a deploy.
What to say to Claude
| When you want to… | Ask Claude |
|---|---|
| Put your site online | "Deploy this folder to Mosaic as a new project." |
| Save form entries | "Store the sign-up form entries in the Mosaic database." |
| Let people upload photos | "Save uploaded photos to Mosaic storage." |
| Add a login | "Add sign-in with Google using Mosaic's built-in sign-in." |
| Check it worked | "Check the deploy status and give me the live link." |
| Undo a bad update | "Roll back to the last version that worked." |
| Retire a project | "Archive this Mosaic project." (not delete) |
Troubleshooting
| You see | Try |
|---|---|
| No Spark icon | Open a file, or click ✻ Claude Code in the status bar. |
| Asked to sign in again | Ctrl+Shift+P › Developer: Reload Window, then sign in. |
| Claude can't find a file | It's probably outside the open folder. Move it in. |
| Site looks old after a change | Wait up to five minutes. |
| Deploy failed | "Check the Mosaic deploy logs and fix the problem." |
| "Managed by another account" | Ask the domain owner to add your email. |
| Anything else | Ctrl+Shift+P › Claude Code: Show Logs. |