# /api/v1/feedback/formulas stops working

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

Calls to /api/v1/feedback/formulas* fail since August 20, 2026. The LangSmith API removed this endpoint following an announcement on July 13, 2026. Requests to these paths no longer succeed.

## What to use instead

Recreate each feedback formula as a composite evaluator, using a code evaluator plus a run rule. This transition requires more than updating an identifier, as composite evaluators have no SDK replacement for the formula methods and must be configured as evaluators and run rules instead.

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

- 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)
- Verified: November 6, 2026, against LangSmith API's own pages
- Page: https://www.okapi.bot/providers/langsmith-api/breaking-changes/api-v1-feedback-formulas-stops-working/

## 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.

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent