> ## Documentation Index > Fetch the complete documentation index at: https://docs.langchain.com/llms.txt > Use this file to discover all available pages before exploring further. # Delete evaluator > Delete an evaluator. When delete_run_rules is true, all run rules referencing this evaluator are deleted first (same tenant). Associated llm_evaluators and code_evaluators rows are removed by foreign-key cascade when the evaluator row is deleted. ## OpenAPI ````yaml /langsmith/langsmith-platform-openapi.json delete /v1/platform/evaluators/{evaluator_id} openapi: 3.1.0 info: title: LangSmith description: >+ The LangSmith API is used to programmatically create and manage LangSmith resources. ## Host https://api.smith.langchain.com ## Authentication To authenticate with the LangSmith API, set the `X-Api-Key` header to a valid [LangSmith API key](https://docs.langchain.com/langsmith/create-account-api-key#create-an-api-key). version: 0.1.0 servers: - url: / security: [] tags: - name: run x-group: Tracing - name: runs x-group: Tracing - name: sessions x-group: Tracing - name: tracer-sessions x-group: Tracing - name: datasets x-group: Datasets - name: examples x-group: Datasets - name: evaluators x-group: Evaluation - name: experiment-view-overrides x-group: Evaluation - name: experiments x-group: Evaluation - name: annotation-queues x-group: Feedback & Annotation - name: annotation_queues x-group: Feedback & Annotation - name: feedback x-group: Feedback & Annotation - name: feedback-configs x-group: Feedback & Annotation - name: alert_rules x-group: Monitoring - name: bulk-exports x-group: Monitoring - name: charts x-group: Monitoring - name: commits x-group: Prompts & Playground - name: directories x-group: Prompts & Playground - name: hub_environments x-group: Prompts & Playground - name: playground-settings x-group: Prompts & Playground - name: prompt-webhooks x-group: Prompts & Playground - name: prompts x-group: Prompts & Playground - name: tag-transitions x-group: Prompts & Playground - name: comments x-group: Prompt Hub - name: likes x-group: Prompt Hub - name: optimization-jobs x-group: Prompt Hub - name: ownerships x-group: Prompt Hub - name: repos x-group: Prompt Hub - name: settings x-group: Prompt Hub - name: tags x-group: Prompt Hub - name: integrations x-group: Integrations & Tools - name: mcp x-group: Integrations & Tools - name: mcp_vendors x-group: Integrations & Tools - name: oauth x-group: Integrations & Tools - name: tools x-group: Integrations & Tools - name: gateway-policies x-group: LLM Gateway - name: sandboxes x-group: Sandboxes - name: issues x-group: Issues - name: issues-agent x-group: Issues - name: Organizations x-group: Administration - name: SCIM Tokens x-group: Administration - name: TTL Settings x-group: Administration - name: access_policies x-group: Administration - name: api-key x-group: Administration - name: audit-logs x-group: Administration - name: auth x-group: Administration - name: aws_marketplace x-group: Administration - name: data_planes x-group: Administration - name: me x-group: Administration - name: orgs x-group: Administration - name: service-accounts x-group: Administration - name: tenant x-group: Administration - name: ttl-settings x-group: Administration - name: usage-limits x-group: Administration - name: workspaces x-group: Administration - name: ace x-group: System - name: backfills x-group: System - name: features x-group: System - name: info x-group: System - name: model-price-map x-group: System - name: public x-group: System - name: threads x-group: System - name: agents x-hidden: true - name: beacon x-hidden: true - name: engine-trial - name: fleet - name: fleet auth x-hidden: true - name: fleet credentials x-hidden: true - name: fleet github-app x-hidden: true - name: fleet integrations x-hidden: true - name: fleet mcp x-hidden: true - name: fleet threads x-hidden: true - name: fleet trigger-templates x-hidden: true - name: fleet triggers x-hidden: true - name: fleet usage x-hidden: true - name: fleet_webhooks x-hidden: true - name: health - name: internal x-hidden: true - name: metrics x-hidden: true - name: nps x-hidden: true - name: sandboxes-internal x-hidden: true - name: skills x-hidden: true paths: /v1/platform/evaluators/{evaluator_id}: delete: tags: - evaluators summary: Delete evaluator description: >- Delete an evaluator. When delete_run_rules is true, all run rules referencing this evaluator are deleted first (same tenant). Associated llm_evaluators and code_evaluators rows are removed by foreign-key cascade when the evaluator row is deleted. parameters: - description: Evaluator ID name: evaluator_id in: path required: true schema: type: string - description: >- When true, delete all run rules for this evaluator before deleting the evaluator name: delete_run_rules in: query schema: type: boolean title: Delete Run Rules responses: '204': description: No Content '400': description: Bad Request content: application/json: schema: $ref: '#/components/schemas/evaluators.ErrorResponse' '401': description: Unauthorized content: application/json: schema: $ref: '#/components/schemas/evaluators.ErrorResponse' '403': description: Forbidden content: application/json: schema: $ref: '#/components/schemas/evaluators.ErrorResponse' '404': description: Not Found content: application/json: schema: $ref: '#/components/schemas/evaluators.ErrorResponse' '409': description: Conflict content: application/json: schema: $ref: '#/components/schemas/evaluators.ErrorResponse' '500': description: Internal Server Error content: application/json: schema: $ref: '#/components/schemas/evaluators.ErrorResponse' security: - API Key: [] - Tenant ID: [] - Bearer Auth: [] components: schemas: evaluators.ErrorResponse: type: object properties: error: description: Error message type: string securitySchemes: API Key: type: apiKey in: header name: X-API-Key Tenant ID: type: apiKey in: header name: X-Tenant-Id Bearer Auth: type: http description: >- Bearer tokens are used to authenticate from the UI. Must also specify x-tenant-id or x-organization-id (for org scoped apis). scheme: bearer ````