An Obsidian plugin (Gemini Scribe) that integrates multiple AI providers (Gemini, Anthropic, OpenAI, Ollama) for chat, agent-based automation, and knowledge management within the Obsidian vault. The system provides a modular architecture with an agent loop that executes tools (vault operations, web search, RAG semantic search, image generation, deep research) with confirmation flows and diff previews. It features a declarative settings UI with per-feature provider routing, a skill system following the agentskills.io spec, MCP server integration, scheduled tasks, lifecycle hooks, and an evaluation harness for benchmarking agent behavior. The codebase demonstrates strong engineering practices: thorough unit testing (73%+ line coverage), clean module boundaries with leaf modules to prevent circular imports, and reusable patterns like typed event buses, retry decorators, and cancellation-safe streaming.