---
title: "Get evaluator"
method: GET
path: "/v1/platform/evaluators/{evaluator_id}"
tags: ["evaluators"]
---

# Get evaluator

`GET /v1/platform/evaluators/{evaluator_id}`

Retrieve a single evaluator by its ID.

## Path parameters

- `evaluator_id` string, required

## Response `200`

OK

- EvaluatorsEvaluator
  - `code_evaluator` EvaluatorsCodeEvaluator
    - `code` string
    - `evaluator_id` string
    - `language` string — Default: "python"
  - `created_at` string
  - `created_by` string
  - `feedback_keys` string[]
  - `id` string
  - `llm_evaluator` EvaluatorsLLMEvaluator
    - `annotation_queue_id` string
    - `commit_hash_or_tag` string
    - `corrections_dataset_id` string
    - `evaluator_id` string
    - `num_few_shot_examples` integer
    - `prompt_id` string
    - `prompt_repo_handle` string
    - `use_corrections_dataset` boolean — Derived from the evaluator's run rules — shared across all rules on this evaluator. Nil when the evaluator has no run rules.
    - `variable_mapping` object — JSONB
  - `name` string
  - `run_rules` EvaluatorsEvaluatorRunRule[]
    - `corrections_dataset_id` string
    - `dataset_id` string
    - `dataset_name` string
    - `group_by` string
    - `id` string
    - `num_few_shot_examples` integer
    - `session_id` string
    - `session_name` string
    - `use_corrections_dataset` boolean
  - `spend_usd` number — Sum of LLM-as-judge run rule spend for the requested period (omitted when feature is disabled).
  - `tenant_id` string
  - `type` 'llm' | 'code'
  - `updated_at` string

## Other responses

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

## Changes

- **2026-05-27** `a0acb3a6a101` — 1 info
  - added the optional property `spend_usd` to the response with the `200` status
- **2026-04-14** `e0b167760947` — 5 info
  - added the optional property `llm_evaluator/allOf[#/components/schemas/evaluators.LLMEvaluator]/num_few_shot_examples` to the response with the `200` status
  - added the optional property `llm_evaluator/allOf[#/components/schemas/evaluators.LLMEvaluator]/use_corrections_dataset` to the response with the `200` status
  - added the optional property `run_rules/items/corrections_dataset_id` to the response with the `200` status
  - added the optional property `run_rules/items/num_few_shot_examples` to the response with the `200` status
  - …1 more
- **2026-04-13** `e86be67718ee` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/langchain-ai/apis/langsmith/changes/v1/platform/evaluators/:evaluator_id/get.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-service-production.skmtc.workers.dev/v1/apis/langchain-ai/langsmith/revisions/a0acb3a6a101/schema)