Claude Code Built-in Tools

Claude Code ships with a small, powerful set of built-in tools that let the model explore and edit a codebase directly: Glob, Grep, Read, Write, Edit, and Bash.

As an architect, your job is not just to know what each tool does, but to know which tool to reach for at each step of an investigation. Picking the right one keeps context lean and the agent fast.

• Glob — find files by name pattern
• Grep — search file contents
• Read — load one file
• Write — create a file
• Edit — make a precise change
• Bash — run a shell command

Glob locates files by their name or path pattern, not their contents. It is the fastest way to answer "where are the X files?"

Patterns use standard glob syntax: ** matches any depth of directories, * matches within a segment. Reach for Glob before reading anything — it narrows a huge tree down to the handful of files worth opening.