# /api/v1/feedback/formulas stops working

Calls to /api/v1/feedback/formulas* on LangSmith API stopped working on August 20, 2026.

- API: LangSmith API (api.smith.langchain.com)
- Kind: Endpoint removal
- Announced: July 13, 2026
- Takes effect: August 20, 2026
- Calls after that day: fail
- Calls it hits: `/api/v1/feedback/formulas*`
- Source: [Announcement](https://docs.langchain.com/langsmith/changelog)
- Page: https://www.okapi.bot/providers/langsmith-api/breaking-changes/api-v1-feedback-formulas-stops-working/

## What to use instead

Recreate each feedback formula as a composite evaluator (a code evaluator plus a run rule).

Composite evaluators have no SDK replacement for the formula methods: composite scores are set up as evaluators and run rules instead.

## LangSmith API's words

> that back composite scores are deprecated in favor of composite evaluators , which implement a composite score as a code evaluator plus a run rule, and are scheduled for removal on 2026-08-20.