openapi: 3.0.3
info:
  title: Microsoft Graph Excel Charts Functions API
  description: REST API for accessing and manipulating Excel workbooks stored in OneDrive for Business, SharePoint sites, or Group drives through Microsoft Graph.
  version: 1.0.0
  contact:
    name: Microsoft Graph Support
    url: https://developer.microsoft.com/graph/support
  license:
    name: Microsoft API Terms of Use
    url: https://learn.microsoft.com/en-us/legal/microsoft-apis/terms-of-use
  x-generated-from: documentation
  x-last-validated: '2026-04-18'
servers:
- url: https://graph.microsoft.com/v1.0
  description: Microsoft Graph v1.0 production endpoint
security:
- oauth2:
  - Files.Read
  - Files.ReadWrite
tags:
- name: Functions
  description: Workbook function operations.
paths:
  /me/drive/items/{item-id}/workbook/functions/{function-name}:
    post:
      operationId: callWorkbookFunction
      summary: Microsoft Excel Call Workbook Function
      description: Invoke an Excel workbook function with the specified parameters.
      tags:
      - Functions
      parameters:
      - name: item-id
        in: path
        required: true
        description: The ID of the workbook file.
        schema:
          type: string
      - name: function-name
        in: path
        required: true
        description: The name of the Excel function to call.
        schema:
          type: string
        example: pmt
      - name: workbook-session-id
        in: header
        required: false
        description: Workbook session ID.
        schema:
          type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              additionalProperties: true
              description: Function parameters as key-value pairs.
            examples:
              CallWorkbookFunctionRequestExample:
                summary: Default callWorkbookFunction request
                x-microcks-default: true
                value:
                  rate: 4.5
                  nper: 12
                  pv: -1250
      responses:
        '200':
          description: Function result returned successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/WorkbookFunctionResult'
              examples:
                CallWorkbookFunction200Example:
                  summary: Default callWorkbookFunction 200 response
                  x-microcks-default: true
                  value:
                    error: null
                    value: 5625.00000734125
        '400':
          description: Bad request or invalid function parameters.
        '401':
          description: Unauthorized.
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  schemas:
    WorkbookFunctionResult:
      type: object
      description: Result of a workbook function call.
      properties:
        error:
          type: string
          nullable: true
          description: Error information if the function failed.
        value: {}
  securitySchemes:
    oauth2:
      type: oauth2
      description: OAuth 2.0 authorization using Microsoft Identity Platform
      flows:
        authorizationCode:
          authorizationUrl: https://login.microsoftonline.com/common/oauth2/v2.0/authorize
          tokenUrl: https://login.microsoftonline.com/common/oauth2/v2.0/token
          scopes:
            Files.Read: Read user files
            Files.ReadWrite: Read and write user files