Learn Claude Code

Timeline Compare Layers

1Fundamentals

01The Agent Loop✓
02Tools✓
03TodoWrite✓
04Subagents✓
05Skills✓
06Compact✓

2System Design

07Tasks✓
08Background Tasks✓
09Agent Teams✓
10Team Protocols✓
11Autonomous Agents✓
12Worktree + Task Isolation✓

3Advanced

13Agent Evals✓
14Workflow Patterns✓
15Context Engineering✓
16Long-Running Harness✓
17MCP✓
18Auto Mode + Sandbox✓
19Think Tool✓
20Parallel Teams✓
21Tool Design (ACI)✓

4Production

22Claude Code Architecture✓
23Tool & Type System
24Query Engine
25Context System
26Security Sandbox
27Filesystem & Bash
28MCP & LSP Communication
29Plugin Skills System
30AppState Dispatch

s23

Tool & Type System

Production Architecture

Defensive Programming

13 LOC2 toolsDeep dive into Tool.ts

Every tool is a mini-application responsible for its own safety and constraints

s22 - Claude Code Architecture

Query Engine - s24

Tool.ts & 类型防线

Zod Input Schema

严安全切入点

Permission Check

To Auto Classifier