Individual skill
langchain-prompt-engineering
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plugins/saas-packs/langchain-py-pack/skills/langchain-prompt-engineering/SKILL.md
Source commit 0500b275e963c027f6b410e8c49c0446945c574e
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- Last checked
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- 2,917
- Repository last updated
- Nov 12, 2026
- License
- MIT
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- ai Repository topic
- automation Repository topic
- claude-code Repository topic
- devops Repository topic
- mcp Repository topic
- ai-agents Repository topic
- anthropic Repository topic
- claude-code-plugins Repository topic
- developer-tools Repository topic
- llm Repository topic
- saas Declared skill tag
- langchain Declared skill tag
- langgraph Declared skill tag
- python Declared skill tag
- langchain-1.0 Declared skill tag
- prompts Declared skill tag
- langsmith Declared skill tag
- prompt-engineering Declared skill tag
- engineering Derived category
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SKILL.mdcore · 17,806 bytesSKILL.mdcore · 17,806 bytesSKILL.mdcore · 17,806 bytesSKILL.mdcore · 17,806 bytesSKILL.mdcore · 17,806 bytesSKILL.mdcore · 17,806 bytesSKILL.mdcore · 17,806 bytesSKILL.mdcore · 17,806 bytesreferences/claude-prompt-conventions.mddoc · 7,097 bytesreferences/extraction-schemas.mddoc · 8,057 bytesreferences/few-shot-selectors.mddoc · 7,455 bytesreferences/langsmith-prompt-hub.mddoc · 6,271 bytesreferences/one-pager.mddoc · 3,139 bytes
Read excerpt
# LangChain Prompt Engineering (Python)
## Overview
A team inherits a LangChain 1.0 codebase with **47 prompt strings** embedded as
f-string literals across 12 Python files. Nobody knows which version is live in
production. Rollback is git-only — requires a deploy. An A/B test on a single
prompt requires shipping code and running two services in parallel. A user pastes
a JSON snippet containing `{` into a chat endpoint and the whole thing throws:
```
KeyError: '"model"'
File ".../langchain_core/prompts/string.py", line ..., in format
```
