Concept ↔ Source Quick Map (English)

Paths are relative to the repo root claude-code-snapshot/. Doc chapter refers to learn_claude_code/docs/en/ (or top-level docs/en/ if mirrored).

Concept	Primary sources	Supporting sources	Doc chapter
CLI entry	src/entrypoints/cli.tsx	src/main.tsx	02-startup-flow.md
Startup / bootstrap	src/main.tsx	src/utils/sessionStart.ts	02-startup-flow.md
Agent core loop	src/query.ts	src/utils/messages.ts	03-core-loop.md
Tool model / execution	src/Tool.ts	src/utils/toolResultStorage.ts	04-tool-system.md
Permissions / rules	src/utils/permissions/	src/utils/settings/permissionValidation.ts	05-permission-security.md
System prompt / context	src/utils/systemPrompt.ts	src/utils/messages/mappers.ts	06-context-prompt.md
Session / memory	src/utils/sessionStorage.ts	src/services/compact/sessionMemoryCompact.ts	07-memory-system.md
Terminal UI / REPL	src/screens/REPL.tsx	src/interactiveHelpers.tsx	08-terminal-ui.md
MCP tools	tools/MCPTool/MCPTool.ts	src/entrypoints/mcp.ts, src/utils/mcpValidation.ts	09-mcp-integration.md
Swarm / multi-agent	src/utils/swarm/	src/utils/teammateMailbox.ts, src/utils/swarm/permissionSync.ts	10-multi-agent.md
Plugins / skills	src/utils/plugins/	src/utils/skills/	11-plugin-skill.md
Streaming / API	src/utils/stream.ts	src/utils/model/model.ts	12-api-streaming.md
Settings	src/utils/settings/settings.ts	src/utils/settings/mdm/settings.ts	13-config-settings.md
Compaction / autocompact	src/services/compact/compact.ts	src/services/compact/microCompact.ts, src/services/compact/autoCompact.ts	14-compact-context-mgmt.md
Slash commands	src/commands/	src/utils/slashCommandParsing.ts	15-command-system.md
Token budget	src/utils/tokenBudget.ts	src/utils/tokens.ts	14-compact-context-mgmt.md
Vim mode	src/vim/	src/screens/REPL.tsx	08-terminal-ui.md
Tool registry / search	src/utils/toolSearch.ts	src/utils/toolSchemaCache.ts	04-tool-system.md

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If you only have the learn_claude_code/ tree checked out, use docs/en/ or learn_claude_code/docs/en/ for the same chapter names.