langchain-ecosystem
Complete guide for LangChain, LangGraph, and Deep Agents development. Covers framework selection, agents, tools, RAG, middleware, graphs, persistence, HITL, subagents, and memory. Triggers when code imports langchain/langgraph/deepagents, or user asks about building AI agents, RAG pipelines, stateful graphs, human-in-the-loop workflows, or agent orchestration.
npx skills add majiayu000/claude-skill-registry --skill langchain-ecosystem --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# LangChain Ecosystem Router ## Framework Selection Frameworks are **layered**, not competing: ``` ┌─────────────────────────────────────┐ │ Deep Agents │ ← planning, memory, skills, files ├─────────────────────────────────────┤ │ LangGraph │ ← graphs, loops, state, control flow ├─────────────────────────────────────┤ │ LangChain │ ← models, tools, prompts, RAG └─────────────────────────────────────┘ ``` **Decision tree (answer in order):** 1. Needs sub-tasks, file management, persistent memory, or on-demand skills? → **Deep Agents** 2. Needs complex control flow (loops, branching, parallel, human-in-the-loop)? → **LangGraph** 3. Single-purpose agent with fixed tools? → **LangChain** (`create_agent`) 4. Pure model call, chain, or retrieval pipeline? → **LangChain** (LCEL) | Capability | LangChain | LangGraph | Deep Agents | |---|-----------|-----------|-------------| | Control flow | Fixed tool loop | Custom graph | Middleware-managed | | Planning | ✗ | Manual | ✓ TodoListMiddleware | | File management | ✗ | Manual | ✓ FilesystemMiddleware | | Persistent memory | ✗ | With checkpointer | ✓ MemoryMiddleware | | Subagent delegation | ✗ | Manual | ✓ SubAgentMiddleware | | Human-in-the-
- Framework Selection
- Quick Start (Most Common Patterns)
- Critical Rules (All Frameworks)
- Deep-Dive References
- LangChain
- LangGraph
- Deep Agents
- Meta
What does the langchain-ecosystem skill do?
Complete guide for LangChain, LangGraph, and Deep Agents development. Covers framework selection, agents, tools, RAG, middleware, graphs, persistence, HITL, subagents, and memory. Triggers when code imports langchain/langgraph/deepagents, or user asks about building AI agents, RAG pipelines, stateful graphs, human-in-the-loop workflows, or agent orchestration.
How do I install it?
Run `npx skills add majiayu000/claude-skill-registry --skill langchain-ecosystem --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From majiayu000/claude-skill-registry, a repository with 534 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.