The Easy LLM CLI is a command-line AI workflow tool that serves as an agent harness compatible with multiple LLM providers including Gemini, OpenAI, and any OpenAI-compatible API. It enables querying and editing codebases, generating applications from PDFs or sketches using multimodal capabilities, and automating operational tasks like pull request queries or complex rebases. The tool supports MCP servers for extended capabilities and allows seamless switching between different LLM providers through environment variable configuration.