langchain-ai / lca-skills
★ 2A skill package that teaches your agent 2 capabilities — every one documented and browsable below, no GitHub required · by langchain-ai.
Each skill below is one capability this package teaches your agent. Install the whole package, or open a skill to install just that one.
Creates code-based evaluators for LangSmith-traced agents. Use when building custom evaluation logic, testing tool usage patterns, or scoring agent outputs…
5 files — installable on its own
Fetches LangSmith traces for debugging agent behavior. Use when troubleshooting agent issues, reviewing conversation history, or investigating tool calls.
1 file — installable on its own
LCA Skills
A collection of agent skills for LangChain Academy and LangSmith workflows.
Available Skills
🔍 langsmith-code-eval
Create code-based evaluators for LangSmith-traced agents with step-by-step collaborative guidance.
Use when: Building custom evaluators to test agent behavior, tool usage, and response quality in LangSmith.
Features:
- 9-step collaborative workflow
- Automatic trace structure inspection
- Category-based evaluation patterns
- Complete code generation for evaluators and experiment runners
Installation
Install all skills:
npx skills add langchain-ai/lca-skillsInstall specific skill:
npx skills add langchain-ai/lca-skills/tree/main/skills/langsmith-code-evalFor Claude Code:
npx skills add langchain-ai/lca-skills -a claude-codeSkills Included
| Skill | Description | Documentation |
|---|---|---|
langsmith-code-eval | Create LangSmith code evaluators | SKILL.md |
Contributing
Have a skill to add? Open a pull request with your skill in the skills/ directory.
License
Apache 2.0
Built for LangChain Academy
Install the whole package (2 skills):
npx skills add https://github.com/langchain-ai/lca-skillsOr install a single skill:
npx skills add https://github.com/langchain-ai/lca-skills --skill <name>Pick the skill name from the Skills tab — each entry there installs independently.