Shannon is an autonomous, white-box AI penetration testing platform that orchestrates multi-agent workflows via Temporal to analyze source code, identify attack vectors, and execute real exploits against running web applications. The system is structured as a pnpm monorepo with two primary applications: a CLI (`apps/cli`) that provides the user-facing interface for launching scans, and a worker (`apps/worker`) that runs the actual pentest pipeline inside Docker containers. The architecture follows a multi-agent pipeline pattern with 13 specialized agents (pre-recon, recon, 5 vulnerability analyzers, 5 exploiters, and a report generator) coordinated through Temporal workflows for reliability and resumability. The codebase demonstrates strong software engineering practices with a clear separation of concerns between Temporal orchestration (activities/workflows), pure domain logic (services), and infrastructure concerns. The worker implements a sophisticated DI container pattern, comprehensive audit logging with crash-safe append-only streams, and a custom error classification system that maps errors to Temporal retry behavior. The system supports multiple LLM providers (Anthropic direct, AWS Bedrock, Google Vertex AI, custom proxies) and implements defense-in-depth billing detection, git checkpointing for workspace rollback, and parallel agent execution with mutex-protected shared state. Key architectural strengths include the deterministic renderer pattern (MCP tool calls → markdown without LLM in the loop), the injectable provider interfaces for extensibility, and the sophisticated session management that enables resumable workspaces. The codebase uses TypeScript with strict compiler options, implements a Result type for explicit error handling, and maintains comprehensive type definitions. The CI/CD pipeline includes semantic releases, Docker image signing with cosign, and multi-platform builds. The system processes vulnerability queues through Zod-validated structured outputs and maintains forensic audit trails of all agent executions with timing, cost, and model metadata.