# LLM Agents Ecosystem Handbook

A practical, opinionated handbook for building, evaluating, securing and shipping LLM agent systems, with templates, provider adapters, a skills catalog, coding-agent workflows and a curated catalog of existing agent projects.

LLM Agents Ecosystem Handbook is a curated handbook covering the modern LLM agent stack in seven parts: core concepts such as agent identity, memory, skills, MCP, safety and observability; a provider ecosystem with adapters and documentation for more than 24 LLM providers and a router for fallback chains; a skills ecosystem with a design guide, taxonomy, maturity model and security checklist; prompt-engineering patterns including prompt-injection defense; coding-agent workflows for Claude Code, Cursor, Codex, Aider and Cline; design-document templates and a machine-readable design spec; and a curated catalog of more than 100 existing agent skeletons, framework comparisons and evaluation tools.

It is organized as templates, blueprints, runnable adapters and curated examples meant to be adopted directly, with an entry point for readers at different stages, from beginners through people picking providers, comparing frameworks, adding memory or retrieval-augmented generation, adding MCP, designing skills, or hardening safety and evaluation.

Website: https://github.com/oxbshw/LLM-Agents-Ecosystem-Handbook