What this skill does
Builds and debugs LangChain apps in Python: LCEL chains, agents, tools, retrievers, streaming, and structured output. Use when writing or reviewing a chain, agent, tool, retriever, or prompt template; when a prompt raises KeyError or "missing variables"; when streaming arrives as one blob or astream_events yields nothing; when an agent loops until GraphRecursionError or repeats a tool; when tool calls fail validation or the provider rejects a tool_call_id; when chat history disappears or the context window overflows; when with_structured_output returns None or a parser crashes on valid JSON; when retrieval returns the wrong chunks; when LangSmith traces are empty; when retries, rate limits, or token cost need bounding; or when imports break after an upgrade. Covers LangGraph state, checkpointers, and middleware. Not for framework-agnostic agent architecture (agents), retrieval design (rag), or chunk tuning (rag-chunking).
LangChain is part of the Developer Tools category — developer tools that help your agent write, review, debug, and ship code. You can install it on its own or alongside other developer tools skills from the OpenClaw catalog.
How to install LangChain
The easiest path is via the OpenClaw Easy desktop app — one click, no terminal required:
- Download OpenClaw Easy for macOS or Windows (free, one-click installer, ~30 seconds).
- Open the in-app Skills panel.
- Search for
langchainand click Install. - The skill activates automatically when an incoming message matches its description.
Install from the command line
If you already run the OpenClaw CLI, add LangChain with a single command:
openclaw skills add langchain
This pulls langchain from ClawHub and installs it into ~/.openclaw/skills/langchain/. Restart the OpenClaw gateway afterwards so the new skill is discovered.
How to use LangChain
Once installed, LangChain activates on its own: when an incoming message on WhatsApp, Telegram, Slack, Discord, Feishu or Line matches the skill's description, your OpenClaw agent loads it and runs the workflow. You can also trigger it explicitly by describing the task in chat. No extra configuration is required after install.
Manual install (advanced)
If you prefer manual installation:
- Click the Download .zip button above to grab
langchain-1.0.1.zipdirectly from our S3 mirror. - Unzip into
~/.openclaw/skills/langchain/(create the directory if it does not exist). - Restart OpenClaw Easy (or the OpenClaw CLI gateway) so the new skill is discovered.
Frequently asked questions
How do I install LangChain?
Install LangChain in the OpenClaw Easy desktop app by opening the Skills panel, searching for langchain, and clicking Install. From a terminal you can run: openclaw skills add langchain. Either way the skill is placed in ~/.openclaw/skills/langchain/.
Is LangChain free?
Yes. LangChain is free and open-source, distributed under the Apache-2.0 license through ClawHub. No account or payment is required to download or run it.
What does LangChain do?
Builds and debugs LangChain apps in Python: LCEL chains, agents, tools, retrievers, streaming, and structured output.
Related: more developer tools skills
If LangChain looks useful, you may also want to check out other developer tools skills in the OpenClaw catalog:
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Free, open-source · Apache-2.0 · Works with Claude, ChatGPT, Gemini, or local Ollama models