Storage Provider Overview

The MCP server supports 7 storage backends for reading and writing documents. Storage tools accept provider configuration inline or via environment variables.

Providers

Provider	Type Value	Use Case
Local Filesystem	`local`	Development, single-server
Amazon S3	`s3`	AWS cloud storage, production
MinIO	`minio`	Self-hosted S3-compatible
WebDAV	`webdav`	Nextcloud, ownCloud, SharePoint
Google Drive	`googledrive`	Google Workspace
OneDrive	`onedrive`	Microsoft 365, SharePoint
SMB/CIFS	`smb`	Corporate network shares

Quick Start

Storage tools accept provider configuration inline:

{
  "tool": "onlyoffice_storage_read",
  "arguments": {
    "provider": {
      "type": "local",
      "baseDir": "/data/documents"
    },
    "path": "reports/2026/january.docx"
  }
}

Or configure a default provider via environment variables:

STORAGE_TYPE=local
STORAGE_BASE_DIR=/data/documents

Local Filesystem

Best for development and single-server deployments.

{ "type": "local", "baseDir": "/data/documents" }

Env Variable	Description
`STORAGE_TYPE`	Set to `local`
`STORAGE_BASE_DIR`	Root directory path

S3

Production-grade cloud storage with presigned URL support.

{
  "type": "s3",
  "bucket": "company-documents",
  "region": "eu-central-1",
  "accessKeyId": "AKIA...",
  "secretAccessKey": "wJal..."
}

Env Variable	Description
`S3_BUCKET`	Bucket name
`S3_REGION`	AWS region
`S3_ACCESS_KEY_ID`	Access key ID
`S3_SECRET_ACCESS_KEY`	Secret access key
`S3_ENDPOINT`	Custom endpoint (for MinIO)
`S3_URL_EXPIRY_SECONDS`	Presigned URL expiry (default: 600)

Minimum IAM policy: s3:GetObject, s3:PutObject, s3:DeleteObject, s3:ListBucket.

MinIO

Self-hosted S3-compatible object storage.

{
  "type": "minio",
  "bucket": "documents",
  "endpoint": "http://minio:9000",
  "accessKeyId": "minioadmin",
  "secretAccessKey": "minioadmin",
  "forcePathStyle": true
}

Uses the same S3_* env variables as S3, plus S3_ENDPOINT and S3_FORCE_PATH_STYLE=true.

WebDAV

Connect to WebDAV-compatible servers (Nextcloud, ownCloud, SharePoint).

{ "type": "webdav", "url": "http://localhost:8080/webdav", "authType": "none" }

{
  "type": "webdav",
  "url": "https://nextcloud.example.com/remote.php/dav/files/user/",
  "authType": "password",
  "username": "user@example.com",
  "password": "app-password"
}

{
  "type": "webdav",
  "url": "https://sharepoint.example.com/",
  "authType": "token",
  "token": "bearer-token"
}

Cloud Provider Setup Guides

For OAuth2-based providers (Google Drive, OneDrive) and SMB/CIFS, detailed setup guides are available:

Google Drive

OneDrive

SMB/CIFS

Credential Management - Encrypted credential storage for providers
Tools Reference - Storage tool signatures (read, write, list, delete, exists)