System Prompt: Minimal mode
Minimal mode: skip hooks, LSP, plugin sync, attribution, auto-memory, background prefetches, keychain reads, and CLAUDE.md auto-discovery. Sets CLAUDE_CODE_SIMPLE=1. Anthropic auth is strictly ANTHROPIC_API_KEY or apiKeyHelper via —settings (OAuth and keychain are never read). 3P providers (Bedrock/Vertex/Foundry) use their own credentials. Skills still resolve via /skill-name. Explicitly provide context via: —system-prompt[-file], —append-system-prompt[-file], —add-dir (CLAUDE.md dirs), —mcp-config, —settings, —agents, —plugin-dir.