Perplexity Agent API

openapi: 3.1.0
info:
  title: Perplexity AI Agent API
  description: Perplexity AI API
  version: 1.0.0
servers:
- url: https://api.perplexity.ai
  description: Perplexity AI API
tags:
- name: Agent
paths:
  /v1/agent:
    post:
      description: Generate a response for the provided input with optional web search and reasoning.
      operationId: createAgent
      summary: Create Agent Response
      security:
      - HTTPBearer: []
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ResponsesRequest'
        required: true
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ResponsesResponse'
            text/event-stream:
              schema:
                $ref: '#/components/schemas/ResponseStreamEvent'
          description: 'Successful response. Content type depends on `stream` parameter:

            - `stream: false` (default): `application/json` with Response

            - `stream: true`: `text/event-stream` with SSE events

            '
      tags:
      - Agent
components:
  schemas:
    FunctionCallOutputInput:
      properties:
        call_id:
          description: The call_id from function_call output
          type: string
        name:
          description: Function name (required by some providers)
          type: string
        output:
          description: Function result (JSON string)
          type: string
        thought_signature:
          description: Base64-encoded signature from function_call
          type: string
        type:
          enum:
          - function_call_output
          type: string
      required:
      - type
      - call_id
      - output
      type: object
      title: FunctionCallOutputInput
    Input:
      description: Input content - either a string or array of input items
      oneOf:
      - title: StringInput
        type: string
      - items:
          $ref: '#/components/schemas/InputItem'
        title: InputItemArray
        type: array
      title: Input
    FinanceSearchTool:
      description: Finance search tool configuration for the Agent API
      properties:
        type:
          description: Tool type identifier
          enum:
          - finance_search
          type: string
      required:
      - type
      type: object
      title: FinanceSearchTool
    FetchUrlQueriesEvent:
      description: 'URL fetch queries event (type: "response.reasoning.fetch_url_queries").

        Contains URLs being fetched.

        '
      properties:
        sequence_number:
          description: Monotonically increasing sequence number for event ordering
          format: int64
          type: integer
        thought:
          type: string
        type:
          $ref: '#/components/schemas/EventType'
        urls:
          items:
            type: string
          type: array
      required:
      - type
      - sequence_number
      - urls
      type: object
      title: FetchUrlQueriesEvent
    WebSearchFilters:
      allOf:
      - $ref: '#/components/schemas/SearchDomainFilter'
      - $ref: '#/components/schemas/DateFilters'
      title: WebSearchFilters
    Date:
      description: 'Input: MM/DD/YYYY, Output: YYYY-MM-DD'
      type: string
      title: Date
    OutputItem:
      discriminator:
        mapping:
          fetch_url_results: '#/components/schemas/FetchUrlResultsOutputItem'
          function_call: '#/components/schemas/FunctionCallOutputItem'
          message: '#/components/schemas/MessageOutputItem'
          search_results: '#/components/schemas/SearchResultsOutputItem'
        propertyName: type
      oneOf:
      - $ref: '#/components/schemas/MessageOutputItem'
      - $ref: '#/components/schemas/SearchResultsOutputItem'
      - $ref: '#/components/schemas/FetchUrlResultsOutputItem'
      - $ref: '#/components/schemas/FunctionCallOutputItem'
      title: OutputItem
    FunctionCallInput:
      properties:
        arguments:
          description: Function arguments (JSON string)
          type: string
        call_id:
          description: The call_id that correlates with function_call_output
          type: string
        name:
          description: The function name
          type: string
        thought_signature:
          description: Base64-encoded signature for thinking models
          type: string
        type:
          enum:
          - function_call
          type: string
      required:
      - type
      - call_id
      - name
      - arguments
      type: object
      title: FunctionCallInput
    ReasoningConfig:
      properties:
        effort:
          description: How much effort the model should spend on reasoning
          enum:
          - low
          - medium
          - high
          type: string
      type: object
      title: ReasoningConfig
    SearchDomainFilter:
      properties:
        search_domain_filter:
          description: Limit search results to specific domains (max 20)
          items:
            maxLength: 253
            type: string
          maxItems: 20
          type: array
      type: object
      title: SearchDomainFilter
    SearchQueriesEvent:
      description: 'Search queries event (type: "response.reasoning.search_queries").

        Contains search queries being executed.

        '
      properties:
        queries:
          items:
            type: string
          type: array
        sequence_number:
          description: Monotonically increasing sequence number for event ordering
          format: int64
          type: integer
        thought:
          type: string
        type:
          $ref: '#/components/schemas/EventType'
      required:
      - type
      - sequence_number
      - queries
      type: object
      title: SearchQueriesEvent
    ResponseCompletedEvent:
      description: 'Response event

        Contains the full or partial response object.

        '
      properties:
        response:
          $ref: '#/components/schemas/ResponsesResponse'
        sequence_number:
          description: Monotonically increasing sequence number for event ordering
          format: int64
          type: integer
        type:
          $ref: '#/components/schemas/EventType'
      required:
      - type
      - sequence_number
      type: object
      title: ResponseCompletedEvent
    FetchUrlResultsOutputItem:
      properties:
        contents:
          items:
            $ref: '#/components/schemas/UrlContent'
          type: array
        type:
          enum:
          - fetch_url_results
          type: string
      required:
      - type
      - contents
      type: object
      title: FetchUrlResultsOutputItem
    OutputItemAddedEvent:
      description: 'Output item added event (type: "response.output_item.added").

        Emitted when a new output item (message or tool call) starts.

        '
      properties:
        item:
          $ref: '#/components/schemas/OutputItem'
        output_index:
          format: int64
          type: integer
        sequence_number:
          description: Monotonically increasing sequence number for event ordering
          format: int64
          type: integer
        type:
          $ref: '#/components/schemas/EventType'
      required:
      - type
      - sequence_number
      - item
      - output_index
      type: object
      title: OutputItemAddedEvent
    SearchResultsEvent:
      description: 'Search results event (type: "response.reasoning.search_results").

        Contains search results returned.

        '
      properties:
        results:
          items:
            $ref: '#/components/schemas/SearchResult'
          type: array
        sequence_number:
          description: Monotonically increasing sequence number for event ordering
          format: int64
          type: integer
        thought:
          type: string
        type:
          $ref: '#/components/schemas/EventType'
        usage:
          $ref: '#/components/schemas/ResponsesUsage'
      required:
      - type
      - sequence_number
      - results
      type: object
      title: SearchResultsEvent
    SearchResult:
      description: A single search result used in LLM responses
      properties:
        date:
          description: Publication date of the result
          type: string
        id:
          description: Unique numeric identifier for the result
          format: int64
          type: integer
        last_updated:
          description: Date the result was last updated
          type: string
        snippet:
          description: Text snippet from the search result
          type: string
        source:
          $ref: '#/components/schemas/SearchSource'
          description: Source type of the result
        title:
          description: Title of the search result page
          type: string
        url:
          description: URL of the search result page
          type: string
      required:
      - id
      - url
      - title
      - snippet
      type: object
      title: SearchResult
    ResponseCreatedEvent:
      description: 'Response created event (type: "response.created").

        Contains the initial response object.

        '
      properties:
        response:
          $ref: '#/components/schemas/ResponsesResponse'
        sequence_number:
          description: Monotonically increasing sequence number for event ordering
          format: int64
          type: integer
        type:
          $ref: '#/components/schemas/EventType'
      required:
      - type
      - sequence_number
      type: object
      title: ResponseCreatedEvent
    ContentPartType:
      description: Type of a content part
      enum:
      - output_text
      type: string
      title: ContentPartType
    SearchResultsOutputItem:
      properties:
        queries:
          items:
            type: string
          type: array
        results:
          items:
            $ref: '#/components/schemas/SearchResult'
          type: array
        type:
          enum:
          - search_results
          type: string
      required:
      - type
      - results
      type: object
      title: SearchResultsOutputItem
    ToolUserLocation:
      description: User's geographic location for search personalization
      properties:
        city:
          description: City name
          type: string
        country:
          description: ISO 3166-1 alpha-2 country code
          type: string
        latitude:
          description: Latitude coordinate
          format: double
          type: number
        longitude:
          description: Longitude coordinate
          format: double
          type: number
        region:
          description: State or region name
          type: string
      type: object
      title: ToolUserLocation
    ResponsesRequest:
      properties:
        input:
          $ref: '#/components/schemas/Input'
        instructions:
          description: System instructions for the model
          type: string
        language_preference:
          description: ISO 639-1 language code for response language
          type: string
        max_output_tokens:
          description: Maximum tokens to generate
          format: int32
          minimum: 1
          type: integer
        max_steps:
          description: 'Maximum number of research loop steps.

            If provided, overrides the preset''s max_steps value.

            Must be >= 1 if specified. Maximum allowed is 10.

            '
          format: int32
          maximum: 10
          minimum: 1
          type: integer
        model:
          description: 'Model ID in provider/model format (e.g., "xai/grok-4-1", "openai/gpt-4o").

            If models is also provided, models takes precedence.

            Required if neither models nor preset is provided.

            '
          type: string
        models:
          description: 'Model fallback chain. Each model is in provider/model format.

            Models are tried in order until one succeeds.

            Max 5 models allowed. If set, takes precedence over single model field.

            The response.model will reflect the model that actually succeeded.

            '
          items:
            type: string
          maxItems: 5
          minItems: 1
          type: array
        preset:
          description: 'Preset configuration name (e.g., "fast-search", "pro-search", "deep-research").

            Pre-configured model with system prompt and search parameters.

            Required if model is not provided.

            '
          type: string
        reasoning:
          $ref: '#/components/schemas/ReasoningConfig'
        response_format:
          $ref: '#/components/schemas/ResponseFormat'
        stream:
          description: If true, returns SSE stream instead of JSON
          type: boolean
        tools:
          description: Tools available to the model
          items:
            $ref: '#/components/schemas/Tool'
          type: array
      required:
      - input
      type: object
      title: ResponsesRequest
    TextDoneEvent:
      description: 'Text done event (type: "response.output_text.done").

        Contains the final text content.

        '
      properties:
        content_index:
          format: int64
          type: integer
        item_id:
          type: string
        output_index:
          format: int64
          type: integer
        sequence_number:
          description: Monotonically increasing sequence number for event ordering
          format: int64
          type: integer
        text:
          type: string
        type:
          $ref: '#/components/schemas/EventType'
      required:
      - type
      - sequence_number
      - item_id
      - output_index
      - content_index
      - text
      type: object
      title: TextDoneEvent
    ReasoningStoppedEvent:
      description: 'Reasoning stopped event (type: "response.reasoning.stopped").

        Signals the model has finished reasoning/searching.

        '
      properties:
        sequence_number:
          description: Monotonically increasing sequence number for event ordering
          format: int64
          type: integer
        thought:
          type: string
        type:
          $ref: '#/components/schemas/EventType'
      required:
      - type
      - sequence_number
      type: object
      title: ReasoningStoppedEvent
    FunctionCallOutputItem:
      properties:
        arguments:
          description: JSON string of arguments
          type: string
        call_id:
          description: Correlates with function_call_output input
          type: string
        id:
          type: string
        name:
          type: string
        status:
          $ref: '#/components/schemas/Status'
        thought_signature:
          description: Base64-encoded opaque signature for thinking models
          type: string
        type:
          enum:
          - function_call
          type: string
      required:
      - type
      - id
      - status
      - name
      - call_id
      - arguments
      type: object
      title: FunctionCallOutputItem
    ResponsesResponse:
      description: Non-streaming response returned when stream is false
      properties:
        created_at:
          description: Unix timestamp when the response was created
          format: int64
          type: integer
        error:
          $ref: '#/components/schemas/ErrorInfo'
          description: Error details if the response failed
        id:
          description: Unique identifier for the response
          type: string
        model:
          description: Model used for generation
          type: string
        object:
          $ref: '#/components/schemas/ResponsesObjectType'
          description: Object type identifier
        output:
          description: Array of output items (messages, search results, tool calls)
          items:
            $ref: '#/components/schemas/OutputItem'
          type: array
        status:
          $ref: '#/components/schemas/Status'
          description: Status of the response
        usage:
          $ref: '#/components/schemas/ResponsesUsage'
          description: Token usage and cost information
      required:
      - id
      - object
      - created_at
      - status
      - model
      - output
      type: object
      title: ResponsesResponse
    FetchUrlResultsEvent:
      description: 'URL fetch results event (type: "response.reasoning.fetch_url_results").

        Contains fetched URL contents.

        '
      properties:
        contents:
          items:
            $ref: '#/components/schemas/UrlContent'
          type: array
        sequence_number:
          description: Monotonically increasing sequence number for event ordering
          format: int64
          type: integer
        thought:
          type: string
        type:
          $ref: '#/components/schemas/EventType'
      required:
      - type
      - sequence_number
      - contents
      type: object
      title: FetchUrlResultsEvent
    ToolCallDetails:
      description: Details about a tool call invocation
      properties:
        invocation:
          description: Number of times this tool was invoked
          format: int64
          type: integer
      type: object
      title: ToolCallDetails
    FetchUrlTool:
      properties:
        max_urls:
          description: Maximum number of URLs to fetch per tool call
          format: int32
          maximum: 10
          minimum: 1
          type: integer
        type:
          enum:
          - fetch_url
          type: string
      required:
      - type
      type: object
      title: FetchUrlTool
    ResponsesObjectType:
      description: Object type in API responses
      enum:
      - response
      type: string
      title: ResponsesObjectType
    OutputItemDoneEvent:
      description: 'Output item done event (type: "response.output_item.done").

        Emitted when an output item (message or tool call) completes.

        '
      properties:
        item:
          $ref: '#/components/schemas/OutputItem'
        output_index:
          format: int64
          type: integer
        sequence_number:
          description: Monotonically increasing sequence number for event ordering
          format: int64
          type: integer
        type:
          $ref: '#/components/schemas/EventType'
      required:
      - type
      - sequence_number
      - item
      - output_index
      type: object
      title: OutputItemDoneEvent
    ResponseInProgressEvent:
      description: 'Response in progress event (type: "response.in_progress").

        Emitted when response processing has started.

        '
      properties:
        response:
          $ref: '#/components/schemas/ResponsesResponse'
        sequence_number:
          description: Monotonically increasing sequence number for event ordering
          format: int64
          type: integer
        type:
          $ref: '#/components/schemas/EventType'
      required:
      - type
      - sequence_number
      type: object
      title: ResponseInProgressEvent
    Tool:
      discriminator:
        mapping:
          fetch_url: '#/components/schemas/FetchUrlTool'
          finance_search: '#/components/schemas/FinanceSearchTool'
          function: '#/components/schemas/FunctionTool'
          web_search: '#/components/schemas/WebSearchTool'
        propertyName: type
      oneOf:
      - $ref: '#/components/schemas/WebSearchTool'
      - $ref: '#/components/schemas/FinanceSearchTool'
      - $ref: '#/components/schemas/FetchUrlTool'
      - $ref: '#/components/schemas/FunctionTool'
      title: Tool
    JSONSchemaFormat:
      description: Defines a JSON schema for structured output validation
      properties:
        description:
          description: Optional description of the schema
          type: string
        name:
          description: Name of the schema (1-64 alphanumeric chars)
          maxLength: 64
          minLength: 1
          type: string
        schema:
          additionalProperties: true
          description: The JSON schema object
          type: object
        strict:
          description: Whether to enforce strict schema validation
          type: boolean
      required:
      - name
      - schema
      type: object
      title: JSONSchemaFormat
    InputContent:
      description: Message content - either a string or array of content parts
      oneOf:
      - title: StringContent
        type: string
      - items:
          $ref: '#/components/schemas/InputContentPart'
        title: ContentPartArray
        type: array
      title: InputContent
    SearchRecencyFilter:
      description: Time-based recency filter for search results
      enum:
      - hour
      - day
      - week
      - month
      - year
      type: string
      title: SearchRecencyFilter
    MessageOutputItem:
      properties:
        content:
          items:
            $ref: '#/components/schemas/ContentPart'
          type: array
        id:
          type: string
        role:
          $ref: '#/components/schemas/RoleType'
        status:
          $ref: '#/components/schemas/Status'
        type:
          enum:
          - message
          type: string
      required:
      - type
      - id
      - status
      - role
      - content
      type: object
      title: MessageOutputItem
    RoleType:
      description: Role in a message
      enum:
      - assistant
      type: string
      title: RoleType
    Annotation:
      description: Text annotation (URL citation)
      properties:
        end_index:
          description: End character index of the annotated text
          format: int32
          type: integer
        start_index:
          description: Start character index of the annotated text
          format: int32
          type: integer
        title:
          description: Title of the cited source
          type: string
        type:
          description: Annotation type (url_citation)
          type: string
        url:
          description: URL of the cited source
          type: string
      type: object
      title: Annotation
    ErrorInfo:
      description: Error information returned when a request fails
      properties:
        code:
          description: Error code
          type: string
        message:
          description: Human-readable error message
          type: string
        type:
          description: Error type category
          type: string
      required:
      - message
      type: object
      title: ErrorInfo
    UrlContent:
      description: Content fetched from a URL
      properties:
        snippet:
          description: The fetched content snippet
          type: string
        title:
          description: The title of the page
          type: string
        url:
          description: The URL from which content was fetched
          type: string
      required:
      - url
      - title
      - snippet
      type: object
      title: UrlContent
    ContentPart:
      properties:
        annotations:
          items:
            $ref: '#/components/schemas/Annotation'
          type: array
        text:
          type: string
        type:
          $ref: '#/components/schemas/ContentPartType'
      required:
      - type
      - text
      type: object
      title: ContentPart
    Currency:
      description: Currency code for cost values
      enum:
      - USD
      type: string
    DateFilters:
      properties:
        last_updated_after_filter:
          $ref: '#/components/schemas/Date'
          description: Return results updated after this date (MM/DD/YYYY)
        last_updated_before_filter:
          $ref: '#/components/schemas/Date'
          description: Return results updated before this date (MM/DD/YYYY)
        search_after_date_filter:
          $ref: '#/components/schemas/Date'
          description: Return results published after this date (MM/DD/YYYY)
        search_before_date_filter:
          $ref: '#/components/schemas/Date'
          description: Return results published before this date (MM/DD/YYYY)
        search_recency_filter:
          $ref: '#/components/schemas/SearchRecencyFilter'
          description: Filter by publication recency (hour/day/week/month/year)
      type: object
      title: DateFilters
    InputMessage:
      properties:
        content:
          $ref: '#/components/schemas/InputContent'
        role:
          enum:
          - user
          - assistant
          - system
          - developer
          type: string
        type:
          enum:
          - message
          type: string
      required:
      - type
      - role
      - content
      type: object
      title: InputMessage
    FunctionTool:
      properties:
        description:
          description: A description of what the function does
          type: string
        name:
          description: The name of the function
          type: string
        parameters:
          additionalProperties: true
          description: JSON Schema defining the function's parameters
          type: object
        strict:
          description: Whether to enable strict schema validation
          type: boolean
        type:
          enum:
          - function
          type: string
      required:
      - type
      - name
      type: object
      title: FunctionTool
    InputContentPart:
      properties:
        image_url:
          maxLength: 2048
          type: string
        text:
          type: string
        type:
          enum:
          - input_text
          - input_image
          type: string
      required:
      - type
      type: object
      title: InputContentPart
    EventType:
      description: SSE event type discriminator
      enum:
      - response.created
      - response.in_progress
      - response.completed
      - response.failed
      - response.output_item.added
      - response.output_item.done
      - response.output_text.delta
      - response.output_text.done
      - response.reasoning.started
      - response.reasoning.search_queries
      - response.reasoning.search_results
      - response.reasoning.fetch_url_queries
      - response.reasoning.fetch_url_results
      - response.reasoning.stopped
      type: string
      title: EventType
    SearchSource:
      description: Source of search results
      enum:
      - web
      type: string
      title: SearchSource
    InputItem:
      discriminator:
        mapping:
          function_call: '#/components/schemas/FunctionCallInput'
          function_call_output: '#/components/schemas/FunctionCallOutputInput'
          message: '#/components/schemas/InputMessage'
        propertyName: type
      oneOf:
      - $ref: '#/components/schemas/InputMessage'
      - $ref: '#/components/schemas/FunctionCallOutputInput'
      - $ref: '#/components/schemas/FunctionCallInput'
      title: InputItem
    ResponsesUsage:
      description: Token usage and cost information for a Responses API request
      properties:
        cost:
          $ref: '#/components/schemas/ResponsesCost'
          description: Cost breakdown for the request
        input_tokens:
          description: Number of input tokens used
          format: int64
          type: integer
        input_tokens_details:
          properties:
            cache_creation_input_tokens:
              description: Tokens used for cache creation
              format: int64
              type: integer
            cache_read_input_tokens:
              description: Tokens read from cache
              format: int64
              type: integer
          type: object
        output_tokens:
          description: Number of output tokens generated
          format: int64
          type: integer
        tool_calls_details:
          description: Details about tool call invocations
          additionalProperties:
            $ref: '#/components/schemas/ToolCallDetails'
          type: object
        total_tokens:
          description: Total tokens used (input + output)
          format: int64
          type: integer
      required:
      - input_tokens
      - output_tokens
      - total_tokens
      type: object
      title: ResponsesUsage
    ResponseStreamEvent:
      description: 'SSE stream event. Discriminate by the `type` field:

        - `response.created`: Initial response object

        - `response.in_progress`: Response processing started

        - `response.completed`: Final response with output

        - `response.failed`: Error occurred

        - `response.output_item.added`: New output item started

        - `response.output_item.done`: Output item completed

        - `response.output_text.delta`: Streaming text delta

        - `response.output_text.done`: Final text content

        - `response.reasoning.started`: Reasoning phase started

        - `response.reasoning.search_queries`: Search queries issued

        - `response.reasoning.search_results`: Search results received

        - `response.reasoning.fetch_url_queries`: URL fetch queries issued

        - `response.reasoning.fetch_url_results`: URL fetch results received

        - `response.reasoning.stopped`: Reasoning phase complete

        '
      discriminator:
        mapping:
          response.completed: '#/components/schemas/ResponseCompletedEvent'
          response.created: '#/components/schemas/ResponseCreatedEvent'
          response.failed: '#/components/schemas/ResponseFailedEvent'
          response.in_progress: '#/components/schemas/ResponseInProgressEvent'
          response.output_item.added: '#/components/schemas/OutputItemAddedEvent'
          response.output_item.done: '#/components/schemas/OutputItemDoneEvent'
          response.output_text.delta: '#/components/schemas/TextDeltaEvent'
          response.output_text.done: '#/components/schemas/TextDoneEvent'
          response.reasoning.fetch_url_queries: '#/components/schemas/FetchUrlQueriesEvent'
          response.reasoning.fetch_url_results: '#/components/schemas/FetchUrlResultsEvent'
          response.reasoning.search_queries: '#/components/schemas/SearchQueriesEvent'
          response.reasoning.search_results: '#/components/schemas/SearchResultsEvent'
          response.reasoning.started: '#/components/schemas/ReasoningStartedEvent'
          response.reasoning.stopped: '#/components/schemas/ReasoningStoppedEvent'
        propertyName: type
      oneOf:
      - $ref: '#/components/schemas/ResponseCreatedEvent'
      - $ref: '#/components/schemas/ResponseInProgressEvent'
      - $ref: '#/components/schemas/ResponseCompletedEvent'
      - $ref: '#/components/schemas/ResponseFailedEvent'
      - $ref: '#/components/schemas/OutputItemAddedEvent'
      - $ref: '#/components/schemas/OutputItemDoneEvent'
      - $ref: '#/components/schemas/TextDeltaEvent'
      - $ref: '#/components/schemas/TextDoneEvent'
      - $ref: '#/components/schemas/ReasoningStartedEvent'
      - $ref: '#/components/schemas/SearchQueriesEvent'
      - $ref: '#/components/schemas/SearchResultsEvent'
      - $ref: '#/components/schemas/FetchUrlQueriesEvent'
      - $ref: '#/components/schemas/FetchUrlResultsEvent'
      - $ref: '#/components/schemas/ReasoningStoppedEvent'
      title: ResponseStreamEvent
    Status:
      description: Status of a response or output item
      enum:
      - completed
      - failed
      - in_progress
      - requires_action
      type: string
      title: Status
    ResponseFailedEvent:
      description: 'Response failed event (type: "response.failed").

        Contains error details when streaming fails.

        '
      properties:
        error:
          $ref: '#/components/schemas/ErrorInfo'
        sequence_number:
          description: Monotonically increasing sequence number for event ordering
          format: int64
          type: integer
        type:
          $ref: '#/components/schemas/EventType'
      required:
      - type
      - sequence_number
      - error
      type: object
      title: ResponseFailedEvent
    TextDeltaEvent:
      description: 'Text delta event (type: "response.output_text.delta").

        Contains incremental text content.

        '
      properties:
        content_index:
          format: int64
          type: integer
        delta:
          type: string
        item_id:
          type: string
        output_index:
          format: int64
          type: integer
        sequence_number:
          description: Monotonically increasing sequence number for event ordering
  

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# Full source: https://raw.githubusercontent.com/api-evangelist/perplexity/refs/heads/main/openapi/perplexity-agent-api-openapi.yml