langchain-common-errors
Paste-match catalog of 14 real LangChain 1.0 / LangGraph 1.0 exceptions\ \ with named\ncauses and named fixes, plus a triage decision tree. Use when you\ \ have a traceback\nand want the specific fix, not speculative documentation. Covers\ \ ImportError (0.2/0.3 \u2192 1.0\nmigration), AttributeError on AIMessage.content,\ \ KeyError in LCEL and prompts,\nGraphRecursionError, silent thread_id memory loss,\ \ JSON-serialization crashes,\nand graphs that halt without reaching END. Trigger\ \ with \"langchain error\",\n\"langgraph traceback\", \"OutputParserException\"\ , \"GraphRecursionError\",
npx skills add jeremylongshore/claude-code-plugins-plus-skills --skill langchain-common-errors --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 Common Errors (Python) ## Overview The same twelve-plus LangChain 1.0 / LangGraph 1.0 tracebacks show up every week in production: `ImportError: cannot import name 'ChatOpenAI' from 'langchain.chat_models'`, `AttributeError: 'list' object has no attribute 'lower'`, `GraphRecursionError: Recursion limit of 25 reached`, `TypeError: Object of type datetime is not JSON serializable`, `KeyE
What does the langchain-common-errors skill do?
Paste-match catalog of 14 real LangChain 1.0 / LangGraph 1.0 exceptions\ \ with named\ncauses and named fixes, plus a triage decision tree. Use when you\ \ have a traceback\nand want the specific fix, not speculative documentation. Covers\ \ ImportError (0.2/0.3 \u2192 1.0\nmigration), AttributeError on AIMessage.content,\ \ KeyError in LCEL and prompts,\nGraphRecursionError, silent thread_id memory loss,\ \ JSON-serialization crashes,\nand graphs that halt without reaching END. Trigger\ \ with \"langchain error\",\n\"langgraph traceback\", \"OutputParserException\"\ , \"GraphRecursionError\",
How do I install it?
Run `npx skills add jeremylongshore/claude-code-plugins-plus-skills --skill langchain-common-errors --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 jeremylongshore/claude-code-plugins-plus-skills, a repository with 2,596 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.