Braintrust Logs and Spans API

openapi: 3.0.3
info:
  title: Braintrust REST API
  description: >-
    The Braintrust REST API for building, evaluating, and observing AI
    applications. The API is organized around REST, uses predictable
    resource-oriented URLs under https://api.braintrust.dev/v1, accepts and
    returns JSON, and authenticates with a Bearer API key. This specification
    covers the core documented resource surface - projects, experiments,
    datasets, logs/spans, prompts, functions and scorers, evals, project
    configuration, organization/ACL management, credentials, and the
    OpenAI-compatible AI proxy.
  termsOfService: https://www.braintrust.dev/legal/terms-of-service
  contact:
    name: Braintrust Support
    email: support@braintrust.dev
    url: https://www.braintrust.dev/docs
  version: '1.0'
servers:
  - url: https://api.braintrust.dev
    description: US data plane (default)
  - url: https://api-eu.braintrust.dev
    description: EU data plane
security:
  - bearerAuth: []
tags:
  - name: Projects
  - name: Experiments
  - name: Datasets
  - name: Logs
  - name: Prompts
  - name: Functions
  - name: Evals
  - name: Project Configuration
  - name: Organization
  - name: ACL
  - name: Credentials
  - name: AI Proxy
paths:
  /v1/project:
    get:
      operationId: getProject
      tags:
        - Projects
      summary: List projects
      description: List out all projects, optionally filtered and paginated.
      parameters:
        - $ref: '#/components/parameters/Limit'
        - $ref: '#/components/parameters/StartingAfter'
        - $ref: '#/components/parameters/EndingBefore'
        - name: org_name
          in: query
          schema:
            type: string
          description: Filter projects to a single organization by name.
        - name: project_name
          in: query
          schema:
            type: string
          description: Filter to a project with the given name.
      responses:
        '200':
          description: Returns a list of projects.
          content:
            application/json:
              schema:
                type: object
                properties:
                  objects:
                    type: array
                    items:
                      $ref: '#/components/schemas/Project'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: postProject
      tags:
        - Projects
      summary: Create project
      description: >-
        Create a new project. If there is an existing project with the same
        name in the organization, will return the existing project unmodified.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateProject'
      responses:
        '200':
          description: Returns the new project object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Project'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/project/{project_id}:
    parameters:
      - $ref: '#/components/parameters/ProjectId'
    get:
      operationId: getProjectId
      tags:
        - Projects
      summary: Get project
      description: Get a project by its unique identifier.
      responses:
        '200':
          description: Returns the project object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Project'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    patch:
      operationId: patchProjectId
      tags:
        - Projects
      summary: Partially update project
      description: >-
        Partially update a project object. Specify the fields to update in the
        payload. Unspecified fields are left unchanged.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PatchProject'
      responses:
        '200':
          description: Returns the updated project object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Project'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    delete:
      operationId: deleteProjectId
      tags:
        - Projects
      summary: Delete project
      description: Delete a project by its unique identifier.
      responses:
        '200':
          description: Returns the deleted project object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Project'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /v1/experiment:
    get:
      operationId: getExperiment
      tags:
        - Experiments
      summary: List experiments
      description: List out all experiments, optionally filtered and paginated.
      parameters:
        - $ref: '#/components/parameters/Limit'
        - $ref: '#/components/parameters/StartingAfter'
        - $ref: '#/components/parameters/EndingBefore'
        - name: project_id
          in: query
          schema:
            type: string
            format: uuid
          description: Filter experiments to a project.
        - name: experiment_name
          in: query
          schema:
            type: string
          description: Filter to an experiment with the given name.
      responses:
        '200':
          description: Returns a list of experiments.
          content:
            application/json:
              schema:
                type: object
                properties:
                  objects:
                    type: array
                    items:
                      $ref: '#/components/schemas/Experiment'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: postExperiment
      tags:
        - Experiments
      summary: Create experiment
      description: >-
        Create a new experiment. If there is an existing experiment with the
        same name as the one specified in the request, will return the existing
        experiment unmodified.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateExperiment'
      responses:
        '200':
          description: Returns the new experiment object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Experiment'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/experiment/{experiment_id}:
    parameters:
      - $ref: '#/components/parameters/ExperimentId'
    get:
      operationId: getExperimentId
      tags:
        - Experiments
      summary: Get experiment
      responses:
        '200':
          description: Returns the experiment object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Experiment'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    patch:
      operationId: patchExperimentId
      tags:
        - Experiments
      summary: Partially update experiment
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                name:
                  type: string
                description:
                  type: string
                metadata:
                  type: object
                  additionalProperties: true
      responses:
        '200':
          description: Returns the updated experiment object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Experiment'
        '401':
          $ref: '#/components/responses/Unauthorized'
    delete:
      operationId: deleteExperimentId
      tags:
        - Experiments
      summary: Delete experiment
      responses:
        '200':
          description: Returns the deleted experiment object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Experiment'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/experiment/{experiment_id}/insert:
    parameters:
      - $ref: '#/components/parameters/ExperimentId'
    post:
      operationId: postExperimentIdInsert
      tags:
        - Experiments
      summary: Insert experiment events
      description: >-
        Insert a set of events into the experiment. Events are upserted by id;
        equivalent to the SDK's logging interface.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - events
              properties:
                events:
                  type: array
                  description: A list of experiment events to insert.
                  items:
                    $ref: '#/components/schemas/InsertEvent'
      responses:
        '200':
          description: Returns the row ids of the inserted events.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/InsertEventsResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/experiment/{experiment_id}/fetch:
    parameters:
      - $ref: '#/components/parameters/ExperimentId'
    post:
      operationId: postExperimentIdFetch
      tags:
        - Experiments
      summary: Fetch experiment (POST form)
      description: >-
        Fetch the events in an experiment. Use the POST form to express complex
        filters, limits, and cursors in the request body.
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/FetchEventsRequest'
      responses:
        '200':
          description: Returns the fetched events.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FetchEventsResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
    get:
      operationId: getExperimentIdFetch
      tags:
        - Experiments
      summary: Fetch experiment (GET form)
      parameters:
        - $ref: '#/components/parameters/Limit'
        - name: max_xact_id
          in: query
          schema:
            type: string
        - name: max_root_span_id
          in: query
          schema:
            type: string
      responses:
        '200':
          description: Returns the fetched events.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FetchEventsResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/experiment/{experiment_id}/feedback:
    parameters:
      - $ref: '#/components/parameters/ExperimentId'
    post:
      operationId: postExperimentIdFeedback
      tags:
        - Experiments
      summary: Feedback for experiment events
      description: Log feedback for a set of experiment events.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - feedback
              properties:
                feedback:
                  type: array
                  items:
                    $ref: '#/components/schemas/FeedbackItem'
      responses:
        '200':
          $ref: '#/components/responses/Empty'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/experiment/{experiment_id}/summarize:
    parameters:
      - $ref: '#/components/parameters/ExperimentId'
    get:
      operationId: getExperimentIdSummarize
      tags:
        - Experiments
      summary: Summarize experiment
      description: Summarize the scores and metrics of an experiment.
      parameters:
        - name: summarize_scores
          in: query
          schema:
            type: boolean
        - name: comparison_experiment_id
          in: query
          schema:
            type: string
            format: uuid
      responses:
        '200':
          description: Returns the experiment summary.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SummarizeExperimentResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/eval:
    post:
      operationId: evalLaunch
      tags:
        - Evals
      summary: Launch an eval
      description: >-
        Launch an evaluation. This is the API-equivalent of the Eval function
        in the SDK; it runs a task function over a dataset and applies scorers.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/EvalLaunchRequest'
      responses:
        '200':
          description: Returns a summary of the launched eval.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SummarizeExperimentResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/dataset:
    get:
      operationId: getDataset
      tags:
        - Datasets
      summary: List datasets
      parameters:
        - $ref: '#/components/parameters/Limit'
        - name: project_id
          in: query
          schema:
            type: string
            format: uuid
        - name: dataset_name
          in: query
          schema:
            type: string
      responses:
        '200':
          description: Returns a list of datasets.
          content:
            application/json:
              schema:
                type: object
                properties:
                  objects:
                    type: array
                    items:
                      $ref: '#/components/schemas/Dataset'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: postDataset
      tags:
        - Datasets
      summary: Create dataset
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateDataset'
      responses:
        '200':
          description: Returns the new dataset object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Dataset'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/dataset/{dataset_id}:
    parameters:
      - $ref: '#/components/parameters/DatasetId'
    get:
      operationId: getDatasetId
      tags:
        - Datasets
      summary: Get dataset
      responses:
        '200':
          description: Returns the dataset object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Dataset'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    patch:
      operationId: patchDatasetId
      tags:
        - Datasets
      summary: Partially update dataset
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                name:
                  type: string
                description:
                  type: string
                metadata:
                  type: object
                  additionalProperties: true
      responses:
        '200':
          description: Returns the updated dataset object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Dataset'
        '401':
          $ref: '#/components/responses/Unauthorized'
    delete:
      operationId: deleteDatasetId
      tags:
        - Datasets
      summary: Delete dataset
      responses:
        '200':
          description: Returns the deleted dataset object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Dataset'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/dataset/{dataset_id}/insert:
    parameters:
      - $ref: '#/components/parameters/DatasetId'
    post:
      operationId: postDatasetIdInsert
      tags:
        - Datasets
      summary: Insert dataset events
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - events
              properties:
                events:
                  type: array
                  items:
                    $ref: '#/components/schemas/InsertEvent'
      responses:
        '200':
          description: Returns the row ids of the inserted events.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/InsertEventsResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/dataset/{dataset_id}/fetch:
    parameters:
      - $ref: '#/components/parameters/DatasetId'
    post:
      operationId: postDatasetIdFetch
      tags:
        - Datasets
      summary: Fetch dataset (POST form)
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/FetchEventsRequest'
      responses:
        '200':
          description: Returns the fetched events.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FetchEventsResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
    get:
      operationId: getDatasetIdFetch
      tags:
        - Datasets
      summary: Fetch dataset (GET form)
      parameters:
        - $ref: '#/components/parameters/Limit'
      responses:
        '200':
          description: Returns the fetched events.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FetchEventsResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/dataset/{dataset_id}/feedback:
    parameters:
      - $ref: '#/components/parameters/DatasetId'
    post:
      operationId: postDatasetIdFeedback
      tags:
        - Datasets
      summary: Feedback for dataset events
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - feedback
              properties:
                feedback:
                  type: array
                  items:
                    $ref: '#/components/schemas/FeedbackItem'
      responses:
        '200':
          $ref: '#/components/responses/Empty'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/dataset/{dataset_id}/summarize:
    parameters:
      - $ref: '#/components/parameters/DatasetId'
    get:
      operationId: getDatasetIdSummarize
      tags:
        - Datasets
      summary: Summarize dataset
      parameters:
        - name: summarize_data
          in: query
          schema:
            type: boolean
      responses:
        '200':
          description: Returns the dataset summary.
          content:
            application/json:
              schema:
                type: object
                properties:
                  project_name:
                    type: string
                  dataset_name:
                    type: string
                  data_summary:
                    type: object
                    nullable: true
                    properties:
                      total_records:
                        type: integer
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/project_logs/{project_id}/insert:
    parameters:
      - $ref: '#/components/parameters/ProjectId'
    post:
      operationId: postProjectLogsIdInsert
      tags:
        - Logs
      summary: Insert project logs events
      description: Insert a set of trace span / log events into a project's logs.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - events
              properties:
                events:
                  type: array
                  items:
                    $ref: '#/components/schemas/InsertEvent'
      responses:
        '200':
          description: Returns the row ids of the inserted events.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/InsertEventsResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/project_logs/{project_id}/fetch:
    parameters:
      - $ref: '#/components/parameters/ProjectId'
    post:
      operationId: postProjectLogsIdFetch
      tags:
        - Logs
      summary: Fetch project logs (POST form)
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/FetchEventsRequest'
      responses:
        '200':
          description: Returns the fetched log events.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FetchEventsResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
    get:
      operationId: getProjectLogsIdFetch
      tags:
        - Logs
      summary: Fetch project logs (GET form)
      parameters:
        - $ref: '#/components/parameters/Limit'
      responses:
        '200':
          description: Returns the fetched log events.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FetchEventsResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/project_logs/{project_id}/feedback:
    parameters:
      - $ref: '#/components/parameters/ProjectId'
    post:
      operationId: postProjectLogsIdFeedback
      tags:
        - Logs
      summary: Feedback for project logs events
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - feedback
              properties:
                feedback:
                  type: array
                  items:
                    $ref: '#/components/schemas/FeedbackItem'
      responses:
        '200':
          $ref: '#/components/responses/Empty'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/prompt:
    get:
      operationId: getPrompt
      tags:
        - Prompts
      summary: List prompts
      parameters:
        - $ref: '#/components/parameters/Limit'
        - name: project_id
          in: query
          schema:
            type: string
            format: uuid
        - name: prompt_name
          in: query
          schema:
            type: string
        - name: slug
          in: query
          schema:
            type: string
      responses:
        '200':
          description: Returns a list of prompts.
          content:
            application/json:
              schema:
                type: object
                properties:
                  objects:
                    type: array
                    items:
                      $ref: '#/components/schemas/Prompt'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: postPrompt
      tags:
        - Prompts
      summary: Create prompt
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreatePrompt'
      responses:
        '200':
          description: Returns the new prompt object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Prompt'
        '401':
          $ref: '#/components/responses/Unauthorized'
    put:
      operationId: putPrompt
      tags:
        - Prompts
      summary: Create or replace prompt
      description: >-
        Create or replace a prompt. If a prompt with the same slug already
        exists in the project, it will be replaced.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreatePrompt'
      responses:
        '200':
          description: Returns the prompt object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Prompt'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/prompt/{prompt_id}:
    parameters:
      - name: prompt_id
        in: path
        required: true
        schema:
          type: string
          format: uuid
    get:
      operationId: getPromptId
      tags:
        - Prompts
      summary: Get prompt
      responses:
        '200':
          description: Returns the prompt object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Prompt'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    patch:
      operationId: patchPromptId
      tags:
        - Prompts
      summary: Partially update prompt
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                name:
                  type: string
                description:
                  type: string
                prompt_data:
                  $ref: '#/components/schemas/PromptData'
                tags:
                  type: array
                  items:
                    type: string
      responses:
        '200':
          description: Returns the updated prompt object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Prompt'
        '401':
          $ref: '#/components/responses/Unauthorized'
    delete:
      operationId: deletePromptId
      tags:
        - Prompts
      summary: Delete prompt
      responses:
        '200':
          description: Returns the deleted prompt object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Prompt'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/function:
    get:
      operationId: getFunction
      tags:
        - Functions
      summary: List functions
      parameters:
        - $ref: '#/components/parameters/Limit'
        - name: project_id
          in: query
          schema:
            type: string
            format: uuid
        - name: function_name
          in: query
          schema:
            type: string
        - name: slug
          in: query
          schema:
            type: string
      responses:
        '200':
          description: Returns a list of functions.
          content:
            application/json:
              schema:
                type: object
                properties:
                  objects:
                    type: array
                    items:
                      $ref: '#/components/schemas/Function'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: postFunction
      tags:
        - Functions
      summary: Create function
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateFunction'
      responses:
        '200':
          description: Returns the new function object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Function'
        '401':
          $ref: '#/components/responses/Unauthorized'
    put:
      operationId: putFunction
      tags:
        - Functions
      summary: Create or replace function
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateFunction'
      responses:
        '200':
          description: Returns the function object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Function'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/function/{function_id}:
    parameters:
      - name: function_id
        in: path
        required: true
        schema:
          type: string
          format: uuid
    get:
      operationId: getFunctionId
      tags:
        - Functions
      summary: Get function
      responses:
        '200':
          description: Returns the function object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Function'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    patch:
      operationId: patchFunctionId
      tags:
        - Functions
      summary: Partially update function
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                name:
                  type: string
                description:
                  type: string
                function_data:
                  type: object
                  additionalProperties: true
      responses:
        '200':
          description: Returns the updated function object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Function'
        '401':
          $ref: '#/components/responses/Unauthorized'
    delete:
      operationId: deleteFunctionId
      tags:
        - Functions
      summary: Delete function
      responses:
        '200':
          description: Returns the deleted function object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Function'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/function/{function_id}/invoke:
    parameters:
      - name: function_id
        in: path
        required: true
        schema:
          type: string
          format: uuid
    post:
      operationId: postFunctionIdInvoke
      tags:
        - Functions
      summary: Invoke function
      description: >-
        Invoke a function (a prompt, code, or LLM scorer) server-side with the
        given input. Optionally stream the result and write a trace span to a
        parent object.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/InvokeFunctionRequest'
      responses:
        '200':
          description: Returns the function result, or an SSE stream when stream is true.
          content:
            application/json:
              schema:
                description: The return value of the function. Shape depends on the function.
            text/event-stream:
              schema:
                type: string
                description: Server-Sent Events stream of the function result when stream is true.
        '401':
          $ref: '#/components/responses/Unauthorized'
  /v1/project_score:
    get:
      operationId: getProjectScore
      tags:
        - Project Configuration
      summary: List project scores
      parameters:
        - $ref: '#/components/parameters/Limit'
        - name: project_id
          in: query
          schema:
            type: string
            format: uuid
      responses:
        '200':
          description: Returns a list of project scores.
          content:
            application/json:
              schema:
        

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