> ## Documentation Index
> Fetch the complete documentation index at: https://docs.flowsign.app/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Flowsign is one word with a lowercase s.
> The REST API base URL is https://my.flowsign.app and every endpoint lives under /api/v1.
> When answering API questions, cite the HTTP method and endpoint path.
> API access needs the Enterprise plan and an API key with the API access permission.

# Attach library documents to a package

> Copies documents from the library into a DRAFT package, leaving the library documents unchanged. Requires canSendPackages.



## OpenAPI

````yaml /api-reference/openapi.json post /api/v1/packages/{packageId}/library-documents
openapi: 3.0.3
info:
  title: Flowsign API
  version: 1.0.0
  description: >-
    Public v1 API for Flowsign. Every endpoint is authenticated with a Bearer
    API key (prefix `fsk_`). Errors use `{ error, details? }`; success responses
    wrap payload data as `{ data }`.


    An organisation is divided into workspaces. A key is issued for one
    workspace and acts there on every request (see `GET /api/v1/workspaces`);
    `X-Workspace-Id` is optional and may only name that workspace. Packages,
    templates, contacts and members are scoped to the key's workspace.
servers:
  - url: https://my.flowsign.app
    description: Production
security:
  - ApiKey: []
paths:
  /api/v1/packages/{packageId}/library-documents:
    post:
      tags:
        - Packages
      summary: Attach library documents to a package
      description: >-
        Copies documents from the library into a DRAFT package, leaving the
        library documents unchanged. Requires canSendPackages.
      operationId: postPackagesByPackageIdLibrary-documents
      parameters:
        - schema:
            type: string
          required: true
          name: packageId
          in: path
        - schema:
            type: string
            description: >-
              The workspace the key was issued for, as returned by `GET
              /api/v1/workspaces`. Optional: omitting it acts in the key's
              workspace, and any other id is rejected with 401.
          required: false
          name: x-workspace-id
          in: header
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                documentIds:
                  type: array
                  items:
                    type: string
                    minLength: 1
                    description: >-
                      The id of a library document, from `GET
                      /api/v1/library/documents`. A document that has been
                      trashed or is already attached elsewhere is a 404.
                    example: cmg1ld8x40001v9x0l4b2r7y3
                  minItems: 1
                  maxItems: 50
                  description: >-
                    The library documents to copy in, from 1 to 50, appended to
                    the package's documents in this order. Place fields on the
                    package's copies with `PUT
                    /api/v1/packages/:packageId/fields`.
              required:
                - documentIds
      responses:
        '201':
          description: Success
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: object
                    properties:
                      attached:
                        type: integer
                        minimum: 0
                        description: >-
                          How many documents were copied into the package: the
                          number sent.
                        example: 1
                    required:
                      - attached
                required:
                  - data
        '400':
          description: The body is not valid JSON, or the package is not a DRAFT
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: Missing or invalid API key
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '402':
          description: Caller's plan does not include this feature (publicApi / webhooks)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          description: API key present but caller lacks the required permission
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          description: >-
            No package with that id is visible to the caller with edit access,
            or one of the documents is no longer in the library
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '409':
          description: >-
            Another member is editing the package in the app right now; try
            again once they are done
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '422':
          description: Request failed schema validation; details keyed by field
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '429':
          description: Rate limit exceeded; see `Retry-After`
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    Error:
      type: object
      properties:
        error:
          type: string
          description: What went wrong, in plain words.
          example: 'Missing permission: canSendPackages'
        details:
          type: object
          additionalProperties:
            type: array
            items:
              type: string
          description: >-
            Validation problems keyed by field path. Present only on 422
            responses.
          example:
            recipients.0.email:
              - Invalid email
      required:
        - error
  securitySchemes:
    ApiKey:
      type: http
      scheme: bearer
      bearerFormat: fsk_*

````