Give It a CLAUDE.md Before You Ask Anything
The single highest-leverage move is a CLAUDE.md file at your repo root. Claude reads it automatically at the start of every session, so it is the place to encode the things you would otherwise repeat in every prompt: how to run the build and tests, the package manager you use, code-style conventions, and any "never do this" rules. Run /init once and Claude will draft a first version by inspecting the project; then trim it to the essentials.
Keep it short and declarative. A 40-line file of concrete rules ("use pnpm, not npm"; "tests live next to source as *.test.ts") beats a 300-line essay the model has to wade through on every turn.
Plan Before You Let It Edit
For anything beyond a one-line change, ask for a plan first. Plan mode makes Claude research the codebase and propose an approach without touching files, so you catch a wrong assumption before it writes 200 lines against it. Approve or correct the plan, then let it implement. This one habit prevents the most common failure mode: a confident agent solving the wrong problem.
Turn Repeated Prompts Into Slash Commands
If you find yourself typing the same instruction repeatedly — "review this diff for security issues", "write a conventional commit message" — save it as a custom slash command (a Markdown file under .claude/commands/). It becomes /your-command and is shareable with your whole team through version control.
Delegate Wide Searches to Subagents
When a task needs broad exploration ("find every place we validate a JWT"), let Claude spawn subagents. They fan out, read in parallel, and report back only the conclusion — keeping your main context window clean instead of flooding it with file dumps. Reserve the main thread for decisions and edits.
Connect Your Stack with MCP
Model Context Protocol servers let Claude Code talk to external systems — GitHub, Jira, a database, your CI. Instead of pasting an error log, point it at the logs; instead of describing a ticket, let it read the ticket. Configure servers you trust and scope their permissions tightly.
Tune Permissions for Flow, Not Friction
Claude asks before running commands or editing files by default. Allowlist the safe, repetitive ones (your test runner, git status, linters) so you stop approving them, but keep destructive operations gated. The goal is a session where you approve meaningful actions and nothing else.
Most of the value comes from two things: a tight CLAUDE.md and using plan mode for non-trivial work. Set those up before reaching for advanced features.
Commit Often, Let It Write the Messages
Frequent commits give you cheap checkpoints to roll back to if a change goes sideways, and Claude writes excellent commit messages from the diff. Treat commits as save points in a long agentic session.
Frequently Asked Questions
Does Claude Code work with any language?
Yes — it operates on files and shell commands, so it is language-agnostic. It works best when your build and test commands are documented in CLAUDE.md so it can verify its own changes.
How do I stop it from running risky commands?
Permissions are deny-by-default for anything destructive. Allowlist only the safe, repetitive commands; everything else prompts you before running.
What is the difference between plan mode and just chatting?
Plan mode forbids edits and focuses the model on research and a written approach you approve first. It dramatically reduces wasted work on larger tasks.