LangSmith API
/api/v1/feedback/formulas* endpoint removal
Stopped workingSubscribe to LangSmith APIShare
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.
Calls it hits
/api/v1/feedback/formulas*
What to use instead of these calls
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.
In 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.
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
- Verified
- , against LangSmith API's own pages
Questions
When does this change take effect?
Calls to /api/v1/feedback/formulas* on LangSmith API stopped working on August 20, 2026.
What happens to calls after August 20, 2026?
They have failed since August 20, 2026.
How do I find the calls this hits in my code?
Okapi reads your repository, finds the calls this change hits and opens a pull request with the fix. It never commits to your branches: every change comes as a pull request you review.
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You fixed this one by hand.
Okapi opens the pull request with the fix before the next breaking change reaches your code.