LangChain Releases Eval Engineering Skill to Help Coding Agents Build Evals
BraceSproul · x · 2026-08-05
LangChain released a new Eval Engineering Skill that helps coding agents build evaluations using context from a repository and production traces.
The authors note that agents are poor one-shot eval generators due to misalignment with human goals. The skill tackles this by strategically infusing human feedback and aligning on three core files:
- Harness.md
- Environment.md
- Task.md
Workflow:
- Install the skill via npx skills add in agents supporting the Agent Skills specification (e.g., Claude Code, Cursor).
- Point it to your repository and agent traces.
- It maps the agent's surface and proposes eval directions based on real production data.
- After user feedback, it generates the three MD files to define evaluation specifics like simulated tools and database types.
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