Type / in Claude Code and you get a menu of built-in commands. Most people only ever use /clear and /model. These are the ones that change how you work, and every one is already installed.
Start with the three from the video, then try the rest one at a time.
The three from the video
| Code | What it does |
|---|---|
| /simplify | Four review agents check the code you just changed (reuse, simplification, speed, right level of abstraction) and apply the fixes |
| /btw <question> | Asks a side question about your session without adding it to the conversation |
| /goal <condition> | Claude keeps working across turns until the condition is met |
Eight more worth knowing
| Code | What it does |
|---|---|
| /branch | Splits the conversation here so you can try another direction; /resume takes you back |
| /rewind | Rewinds the conversation and/or your code to an earlier point (also /undo) |
| /context | Shows what is filling Claude's context as a coloured grid, with tips to free space |
| /recap | One-line summary of the session so far |
| /diff | Review every change in your working tree, including Claude's edits |
| /security-review | Checks the changes on your branch for security holes |
| /insights | An HTML report on how you use Claude Code and where things go wrong |
| /powerup | Quick interactive lessons on Claude Code features |
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