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Fast regex search across directories (command rg) that respects .gitignore, skips hidden and binary files by default and filters by file type. A go-to command for coding agents searching a codebase.

Connects Claude Code to rust-analyzer so the agent can go to definitions, find references and analyze symbols and call relationships in Rust code. Install rust-analyzer via rustup or a package manager first. Official Anthropic plugin.

AST-based structural code search, lint and bulk rewrite tool: matches code patterns rather than text, with $VAR wildcards for nodes, making it well suited to agents doing large cross-file refactors.