MLA 023 Claude Code Components

Claude Code distinguishes itself through a deterministic hook system and model-invoked skills that maintain project consistency better than visual-first tools like Cursor. Its multi-surface architecture allows developers to move sessions between CLI, web sandboxes, and mobile while maintaining persistent context.

Links

• Notes and resources at ocdevel.com/mlg/mla-23
• Try a walking desk - stay healthy & sharp while you learn & code
• Generate a podcast - use my voice to listen to any AI generated content you want

Agent Comparison

• Cursor: VS Code fork. Uses visual interactions (Cmd+K, Composer mode), multi-line tab completion, and background cloud agents. Credit-based billing ($20 to $200).
• Codex CLI: Terminal-first Rust agent. Uses GPT-5.3-Codex. Features three autonomy modes (Suggest, Auto-approve, Full Auto). Included in $20 ChatGPT Plus.
• Antigravity: Agent-first interface using Gemini 3 Pro. Manager View orchestrates parallel agents that produce verifiable task lists and recordings.
• Claude Code: Terminal, IDE, and mobile sessions. Uses Sonnet/Opus 4.5/4.6. Differentiates via deep composability and cross-surface persistence.

Persistent Memory and Skills

• CLAUDE.md: 4-tier hierarchy (Enterprise, Project, User, Local). Loads recursively, enabling monorepo support where child directories load lazily. Imports use @ syntax.
• Skills: Model-invoked capability folders. Three-stage loading (metadata, instructions, supporting resources) minimizes context use. Claude triggers them based on description fields.
• Commands: User-triggered slash commands. /compact preserves topics while trimming history, /init generates memory files, and /checkpoint manages rollbacks.

Enforcement and Integration

• Hooks: Deterministic shell commands or LLM prompts. Fired at 10 events, including PreToolUse (blocking), PostToolUse (formatting), and Stop (self-correction). Exit code 2 blocks actions, code 0 allows.
• MCP: Standard for connecting external tools (PostgreSQL, GitHub, Sentry). Tool Search activates when metadata exceeds 10% context window. Claude Code can serve its own tools via MCP.
• Subagents: Isolated context workers. Explore uses Haiku for discovery, Plan uses Sonnet for research. isolation: worktree provides filesystem-level separation.
• Agent Teams: Persistent multi-pane coordination via tmux. Modes: Hub-and-Spoke, Task Queue, Pipeline, Competitive, and Watchdog.

Operations and Security

• Checkpoints: Granular undo allows independent rollback of code changes or conversation history.
• Thinking Triggers: Keywords Think to Ultrathink adjust reasoning compute allocation.
• Headless: --print or --headless flags enable CI/CD. GitHub Action uses four parallel agents to score review findings above 80% confidence.
• Sandboxing: Uses Apple Seatbelt (macOS) or Bubblewrap (Linux). Restricts filesystem and network access, reducing permission prompts by 84%.
• Output Styles: Modifies system prompts for Default, Explanatory, or Learning personas.