> ## Documentation Index > Fetch the complete documentation index at: https://docs.parley.so/llms.txt > Use this file to discover all available pages before exploring further. # Get a field > Get a single custom field definition by ID. ## OpenAPI ````yaml https://api.parley.so/openapi.json get /fields/{id} openapi: 3.1.1 info: title: Parley API version: 1.0.0 description: >- Manage Parley's projects (matters or cases), accounts (client organizations), contacts (people), tasks, custom fields, notes, files, activity, automations, and skills. Records refer to each other as { type, id, name } references; writes take IDs. Errors are { error: { code, message, details } }, where code names what went wrong and each operation lists the codes it can return. In a query string, write a timestamp's offset as Z or %2B, because a raw + arrives as a space. The MCP server at /mcp offers the same data as a smaller set of tools. servers: - url: https://api.parley.so/v1 security: - bearerAuth: [] tags: - name: Projects description: >- A project is a matter or case: it groups the files, notes, activity, and tasks for one engagement, and links to the accounts and contacts it involves. - name: Accounts description: >- An account is a client organization. Contacts belong to it, and projects link to it. - name: Contacts description: >- A contact is a person, optionally belonging to one account and linked to projects. - name: Tasks description: >- A task is a to-do with a status, assignee, and due date, optionally about one project, account, or contact. - name: Fields description: >- Custom fields defined for projects, accounts, contacts, or tasks. Records carry their values in fields, keyed by field name. - name: Notes description: >- Markdown notes on a project, account, or contact. Updates take the version you last read, so concurrent edits fail with 409 VERSION_CONFLICT instead of overwriting. - name: Files description: >- Files and folders of a project, account, contact, or intake, or the organization's Library. Add a file by creating an upload, PUTting its bytes, and adding the upload to a location. - name: Activity description: >- What happened across the organization or on one record: changes, links, notes, files, USCIS case updates, and synced emails and meetings. Each item's kind says which details it carries. - name: Sessions description: >- Conversations with Parley's assistant, from the web app, Word, Outlook, automation runs, and the API. Start one with a message, follow up or steer it while it works, and read its replies. - name: Automations description: >- Instructions Parley's assistant carries out on a schedule, as the person who created them, with nobody present. - name: Skills description: >- Reusable playbooks for Parley's assistant: a SKILL.md plus optional bundled documents, addressed by slug. - name: Users description: The people in your organization, and the caller. paths: /fields/{id}: get: tags: - Fields summary: Get a field description: Get a single custom field definition by ID. operationId: getField parameters: - name: id in: path required: true schema: type: string minLength: 1 description: The field ID. responses: '200': description: OK content: application/json: schema: $ref: '#/components/schemas/Field' '400': description: The request was invalid. VALIDATION_FAILED. content: application/json: schema: $ref: '#/components/schemas/ValidationFailedError' '401': description: Missing or invalid credentials. UNAUTHORIZED. content: application/json: schema: $ref: '#/components/schemas/UnauthorizedError' '403': description: You don't have permission. FORBIDDEN. content: application/json: schema: $ref: '#/components/schemas/ForbiddenError' '404': description: Not found. NOT_FOUND. content: application/json: schema: $ref: '#/components/schemas/NotFoundError' '429': description: Too many requests, or a usage limit was reached. TOO_MANY_REQUESTS. content: application/json: schema: $ref: '#/components/schemas/TooManyRequestsError' components: schemas: Field: type: object properties: id: type: string minLength: 1 description: The field ID. name: type: string minLength: 1 maxLength: 200 description: Field name. Unique among the fields of one record type. recordType: enum: - project - account - contact - task type: string description: The kind of record the field belongs to. type: enum: - text - long_text - number - boolean - datetime - email - url - address - single_select - collection - user type: string description: >- The field's value type. It can't be changed after the field is created. options: type: array items: type: string description: >- Option labels of a single_select field, in order. Empty for other types. automation: enum: - 'off' - suggest - auto type: string description: >- Whether Parley fills the field from emails and documents: off, suggest (proposes values for someone to accept), or auto (sets values directly). automationInstructions: anyOf: - type: string minLength: 1 maxLength: 2000 description: Guidance Parley follows when it fills the field. - type: 'null' description: Guidance Parley follows when it fills the field, or null. system: type: boolean description: >- A built-in field. It can't be renamed, reconfigured, or deleted, but its values can be set like any other field's. readOnly: type: boolean description: >- Parley maintains the field's values, so they can't be set through fields on a record. createdAt: type: string format: date-time description: When the field was created. updatedAt: type: string format: date-time description: >- When the field definition was last updated. Setting values on records does not change it. required: - id - name - recordType - type - options - automation - automationInstructions - system - readOnly - createdAt - updatedAt ValidationFailedError: type: object properties: error: type: object properties: code: type: string const: VALIDATION_FAILED message: type: string examples: - The request is invalid. details: type: object properties: issues: type: array items: type: object properties: path: type: string description: >- Where the problem is, as a dotted path into the input such as accountIds.add.0 or reminder.remindAt. Empty for the input as a whole. message: type: string description: What is wrong with the value. required: - path - message description: Each problem with the input. required: - issues required: - code - message - details required: - error UnauthorizedError: type: object properties: error: type: object properties: code: type: string const: UNAUTHORIZED message: type: string examples: - Missing or invalid credentials. required: - code - message required: - error ForbiddenError: type: object properties: error: type: object properties: code: type: string const: FORBIDDEN message: type: string examples: - You don't have permission to do this. required: - code - message required: - error NotFoundError: type: object properties: error: type: object properties: code: type: string const: NOT_FOUND message: type: string examples: - Not found. required: - code - message required: - error TooManyRequestsError: type: object properties: error: type: object properties: code: type: string const: TOO_MANY_REQUESTS message: type: string examples: - Too many requests. required: - code - message required: - error securitySchemes: bearerAuth: type: http scheme: bearer description: A Parley API key. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.