Exa MCP Server is a Model Context Protocol server that connects AI agents to Exa's web search and research capabilities. It provides a standardized interface for agents to perform web searches, fetch webpage content, run multi-step research agents, and access other Exa functionalities. The architecture features clear separation of concerns with API handlers for Vercel deployment, core MCP server logic, tool implementations for each Exa capability, and utility functions for authentication, logging, and error handling. Key entry points include stdio CLI for local usage and Vercel HTTP functions for cloud deployment. The system handles authentication via API keys or OAuth, implements rate limiting for free tier users, and includes mechanisms to prevent API key leakage between requests.
CoexistAI is a research assistant framework implemented as a FastAPI application that provides a suite of API endpoints for web search, YouTube and Reddit retrieval, geospatial mapping, git repository analysis, text-to-speech/podcast generation, and knowledge base creation from local files or crawled websites. It integrates with an MCP server for agentic workflows and supports pluggable LLMs (Google, OpenAI, Ollama, local) and embedders (Google, HuggingFace, Infinity). The architecture is monolithic with modular utility functions, containerized via Docker with a companion SearxNG instance for privacy-respecting search. The codebase demonstrates a hybrid nature: while primarily an application with explicit API entry points, its core purpose is to support research and data-gathering tasks, making it equally relevant for data research scenarios. Configuration is centralized, and the system includes a web-based admin UI for runtime parameter changes. Active development is evident from recent commits and numerous utility modules, though some global mutable state and fallback-heavy code indicate where the system has evolved rapidly.