Prompt file imported from Ramakrishna-Gedala/ragas-rag-evaluation-lab (.github/prompts/add-ragas-metric.prompt.md). Copyright stays with the author.

Add a RAGAS Metric

Add a metric to the evaluation lab.

Before coding:

1. Read docs/RAGAS_CONCEPTS.md.
2. Read backend/app/evaluation/metric_catalog.py.
3. Check the pinned/current RAGAS API for the metric.
4. State its approach, required fields, reference requirement, and cost category.

Then:

• add it to the catalog
• implement it in the correct metric group
• add it only to appropriate DEV/QA/PROD profiles
• add an offline test when possible
• update documentation
• never silently convert a provider failure to score 0