Forensic Analysis: Claude Code v1.0

Intelligence Briefing

Deep forensic analysis of Anthropic's Claude Code repository, deconstructing prompt lineage and agentic loop parallelism.

Prompt Construction Lineage

src/utils/systemPrompt.ts

Entry Point

The effective system prompt is assembled here, prioritizing overrides, coordinator roles, and subagent instructions.

src/constants/prompts.ts

Identity Blocks

Contains static blocks: # Doing tasks (L199), # Executing care (L255), and # Using tools (L269).

Construction Flow

graph TD User[User Input] --> SystemPrompt[Effective System Prompt] SystemPrompt --> Override{Override?} Override -- Yes --> LoopMode[Loop Mode System Prompt] Override -- No --> Coordinator{Coordinator Mode?} Coordinator -- Yes --> CoordPrompt[Coordinator System Prompt] Coordinator -- No --> Agent{Agent Defined?} Agent -- Yes --> AgentPrompt[Agent Specific Instructions] Agent -- No --> Default[Claude Code Default Identity] Default --> Intro[Intro Section] Intro --> DoingTasks[# Doing Tasks Section] DoingTasks --> Care[# Executing Actions with Care] Care --> UsingTools[# Using Your Tools] UsingTools --> Env[# Environment Info] Env --> Session[# Session Specific Guidance]

Agentic Looping & Parallelism

Loop Sequence & Recovery

graph TD Start[User Turn Start] --> Compaction[Context Compaction Phase] Compaction --> Snip[History Snip] Snip --> Micro[Microcompact] Micro --> Auto[Autocompact] Auto --> API[Anthropic API Call] API --> Stream[Stream Response] Stream --> Error{Recoverable Error?} Error -- Yes (413/MaxTokens) --> Reactive[Reactive Compact/Collapse] Reactive --> Compaction Error -- No --> Final[Final Response] Stream -- Tool Use --> ToolBatch[Batch Tool Calls] ToolBatch --> Parallel{Parallel?} Parallel -- Yes --> Safe[Run Concurrently] Parallel -- No --> Serial[Run Serially] Safe --> Context[Merge Context Modifiers] Serial --> Context Context --> Hooks[Stop Hooks Check] Hooks -- Blocked --> Feedback[Inject System Message] Feedback --> Compaction Hooks -- Pass --> Next[Wait for User Input]

src/services/tools/toolOrchestration.ts

Concurrency Logic

Decides safety via tool.isConcurrencySafe(). Consecutive safe tools (Read/Grep) run in parallel (max 10).

src/query.ts

Recovery Pipeline

Withholds API errors from user. If context overflows, triggers Reactive Compact or Snip and continues turn.