> ## Documentation Index > Fetch the complete documentation index at: https://langwatch.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # Report batch evaluation results > Report the rows of a batch evaluation against an experiment, so its scores and progress show up in the app. This is the second half of an SDK batch evaluation: create the experiment with `POST /api/experiment/init`, then post rows here as they finish. Identify the experiment by either `experiment_id` or `experiment_slug`. Bodies up to 20MB are accepted. ## OpenAPI ````yaml POST /api/evaluations/batch/log_results openapi: 3.1.0 info: title: LangWatch API version: 1.0.0 description: LangWatch openapi spec servers: - url: https://app.langwatch.ai security: - project_api_key: [] paths: /api/evaluations/batch/log_results: post: tags: - Evaluations summary: Report batch evaluation results description: >- Report the rows of a batch evaluation against an experiment, so its scores and progress show up in the app. This is the second half of an SDK batch evaluation: create the experiment with `POST /api/experiment/init`, then post rows here as they finish. Identify the experiment by either `experiment_id` or `experiment_slug`. Bodies up to 20MB are accepted. operationId: postApiEvaluationsBatchLog_results parameters: [] requestBody: required: true content: application/json: schema: allOf: - type: object properties: run_id: type: string workflow_version_id: type: string nullable: true progress: type: number nullable: true total: type: number nullable: true dataset: type: array items: type: object properties: index: type: number target_id: type: string nullable: true entry: type: object additionalProperties: {} predicted: type: object additionalProperties: {} cost: type: number nullable: true duration: type: number nullable: true error: type: string nullable: true trace_id: type: string nullable: true required: - index - entry additionalProperties: false evaluations: type: array items: type: object properties: evaluator: type: string name: type: string nullable: true target_id: type: string nullable: true status: anyOf: - type: string enum: - processed - type: string enum: - skipped - type: string enum: - error index: type: number duration: type: number nullable: true inputs: type: object additionalProperties: {} score: type: number nullable: true label: type: string nullable: true passed: type: boolean nullable: true details: type: string nullable: true cost: type: number nullable: true required: - evaluator - status - index additionalProperties: false - type: object properties: experiment_id: type: string nullable: true experiment_slug: type: string nullable: true run_id: type: string nullable: true workflow_id: type: string nullable: true name: type: string nullable: true targets: type: array items: allOf: - type: object properties: id: type: string name: type: string prompt_id: type: string nullable: true prompt_version: type: number nullable: true agent_id: type: string nullable: true evaluator_id: type: string nullable: true model: type: string nullable: true metadata: type: object additionalProperties: anyOf: - type: string - type: number - type: boolean nullable: true required: - id - name - type: object properties: type: anyOf: - type: string enum: - prompt - type: string enum: - agent - type: string enum: - evaluator - type: string enum: - workflow - type: string enum: - custom nullable: true timestamps: type: object properties: created_at: type: number nullable: true finished_at: type: number nullable: true stopped_at: type: number nullable: true additionalProperties: false required: - run_id responses: '200': description: The rows were recorded content: application/json: schema: type: object properties: message: type: string description: Human-readable confirmation required: - message '400': description: >- The request was not sent as application/json, failed validation, named neither experiment_id nor experiment_slug, or carried timestamps in seconds rather than milliseconds content: application/json: schema: type: object properties: message: type: string description: Set when the request was rejected before validation error: type: string description: Set when the body parsed and then failed validation '401': description: Missing or invalid API key content: application/json: schema: type: object properties: error: type: string description: The failure, as a sentence kind: type: string description: Stable failure code, on the failures that carry one meta: type: object additionalProperties: {} description: >- What the code needs to be acted on, such as the missing field required: - error '403': description: The API key lacks evaluations:manage content: application/json: schema: type: object properties: error: type: string description: The failure, as a sentence kind: type: string description: Stable failure code, on the failures that carry one meta: type: object additionalProperties: {} description: >- What the code needs to be acted on, such as the missing field required: - error components: securitySchemes: project_api_key: type: apiKey in: header name: X-Auth-Token description: >- Project API key for sending traces and accessing project-scoped resources. Format: sk-lw-... (no underscore). Obtain one by creating a project via the Admin API or the LangWatch UI. ````