Practice mode · free · unlimited · not certifiable

Choosing the Right Tool

Unscored tasks with hints and instant feedback. Practice results never become credentials.

Short lesson

Working with agents safely · 10 min

Name each agent by role and task, isolate them in worktrees, hand off through files, review every diff, never paste secrets. Tool notes (2026-10): Claude Code (CLAUDE.md, agents folder), Codex CLI and others (AGENTS.md), Gemini CLI (GEMINI.md), Cursor, Copilot — verify names in each tool's docs.

L1Knowledge checkmcq

You need to change code in many files and run the tests. Which tool fits?

L2Knowledge checkmcq

A contract under NDA needs a summary. Which is appropriate?

L3Route eight tasksroute

For each task choose the most suitable kind of AI tool and justify it in one line (task type, data sensitivity, cost, speed, context, access, ease of checking). Several answers can be defensible.