Teach Claude Code built-in commands versus bundled skills such as debug, batch, loop, claude-api, and fewer-permission-prompts.
Teach Claude Code MCP installation, /mcp, OAuth/remote MCP, and MCP prompts as slash commands.
Teach Claude Code skills as custom slash commands, arguments, allowed-tools, context fork, and legacy commands compatibility.
Teach Claude Code /agents, custom subagents, @ mentions, foreground/background behavior, subagent memory, scoped MCP, and AskUserQuestion limits.
Teach Codex diff review, working-tree review mode, and copy/export habits before committing.
Teach Codex MCP setup, /mcp diagnostics, apps, plugins, and external tool trust boundaries.
Teach Codex skills, $skill invocation, .agents/skills layout, references/scripts/assets, and imagegen as a Codex skill example.
Teach Codex subagents, /agent thread switching, parallel exploration, and background terminal control.