See what is filling the context window
slash commands
// what it does
/context visualizes the current context window as a colored grid, showing how much is consumed by the system prompt, CLAUDE.md files, tools, MCP servers, and the conversation, with optimization suggestions. It is also the way to confirm which CLAUDE.md and CLAUDE.local.md files actually loaded — if a file is missing from the breakdown, Claude can't see it.
// shell
$ /context