---
title: "Delete evaluator"
method: DELETE
path: "/api/v1/platform/evaluators/{evaluator_id}"
tags: ["evaluators"]
---

# Delete evaluator

`DELETE /api/v1/platform/evaluators/{evaluator_id}`

## Request

- Base URL: `https://api.smith.langchain.com`
- URL: `https://api.smith.langchain.com/api/v1/platform/evaluators/{evaluator_id}`
- Auth: one of:
  - API key in header `X-API-Key`
  - API key in header `X-Tenant-Id`
  - HTTP bearer

Delete an evaluator. Returns 409 when a code evaluator build is ENQUEUED or BUILDING, or when run rules still reference the evaluator and delete_run_rules is false. When delete_run_rules is true, all run rules referencing this evaluator are deleted first (same tenant) if the build is not in flight. Associated llm_evaluators and code_evaluators rows are removed by foreign-key cascade when the evaluator row is deleted.

## Path parameters

- `evaluator_id` string, required

## Query parameters

- `delete_run_rules` boolean

## Response `204`

No Content

## Other responses

- `400`: Bad Request
- `401`: Unauthorized
- `403`: Forbidden
- `404`: Not Found
- `409`: Conflict
- `500`: Internal Server Error

## Changes

- **2026-10-16** `1a8ee9358d81`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/langchain-ai/apis/langsmith/changes/api/v1/platform/evaluators/:evaluator_id/delete.md)

---

[API](https://skmtc.dev/langchain-ai/apis/langsmith.md) - [All operations](https://skmtc.dev/langchain-ai/apis/langsmith/llms.txt) - [OpenAPI document](https://skmtc.dev/langchain-ai/apis/langsmith/revisions/28621d1a347a?raw)