Best starting point
Bootstrap + Query
If you only open two areas first, read bootstrap-runtime and query-engine.
Core Modules
Clickable module breakdown
Each module below is grounded in real source files and framed for learning: role, inputs, outputs, key files, and where to start reading.
Best differentiator
Tool runtime + permissions
Together they explain why Claude Code feels production-grade.
Advanced route
MCP + plugins + remote
These modules show the platform ambition of the project.
Keeps startup responsive while supporting many execution personalities inside one product.
Inputs
- CLI args
- Environment variables
- Settings
- Trust and policy state
Outputs
- Selected runtime path
- Initialized global state
- Rendered REPL or headless loop
Why study it
- Shows startup optimization patterns.
- Shows trust-safe initialization sequencing.
Read first
src/entrypoints/cli.tsxsrc/main.tsx
Key files
src/entrypoints/init.tsβ Central initialization and shutdown wiring.src/setup.tsβ Startup setup and prewarming.