LangSmith API · Endpoint removal
/api/v1/feedback/formulas stops working
Stopped working
Calls to /api/v1/feedback/formulas* on LangSmith API stopped working on August 20, 2026.
What to use instead of these calls
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.
Calls it hits
/api/v1/feedback/formulas*
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.
Facts
- API
- LangSmith API
api.smith.langchain.com - Kind
- Endpoint removal
- Announced
- July 13, 2026
- Takes effect
- August 20, 2026
- Calls after that day
- Fail
- Source
- Announcement
- Last updated
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