Contents
- Why compare storage through an agent lens now
- AEO ratings — the seven-service leaderboard
- Dropbox — the remote MCP server that landed in March 2026
- Box — the enterprise MCP pick
- Google Drive and Workspace — third-party MCP plus native connector
- Microsoft 365 / OneDrive — legacy MCP deprecated, Work IQ takes over
- S3 and R2 — agents talking to object storage
- Selection flow by use case
- FAQ
Why compare storage through an agent lens now
By 2026, the frontier of agent engineering has shifted from "tool calling" to "content access". Internal documents, contracts, design files, customer materials — getting an agent to safely, auditably, and with appropriate permissions touch this unstructured data is the gate for enterprise adoption.
KanseiLink aggregates self-reported agent data across 225+ services. The file tier lives in category: storage and the adjacent category: productivity (Google Workspace and friends). This article focuses on the seven services that show up most frequently when agents read or write files, ranked by AEO grade, official MCP server availability, and the main constraints.
2026 is the year official MCP servers started shipping from storage vendors themselves. Box, Dropbox, and Microsoft (OneDrive/SharePoint) all released official servers in quick succession. Only Google Drive sits in the odd spot of having a third-party reference implementation (modelcontextprotocol/server-gdrive) plus Anthropic's native Google Workspace connector (added February 24, 2026) — but no first-party MCP server from Google itself.
AEO ratings — the seven-service leaderboard
Pulled from KanseiLink's search_services tool (April 2026 snapshot, category: storage plus adjacent), sorted by AEO grade.
| Service | Tier | MCP status | AEO | Reports | Success |
|---|---|---|---|---|---|
| Dropbox Business | Storage | Official remote MCP (β, 2026-03-18) | BBB | 3 | 67% |
| Google Drive | Storage | Third-party (modelcontextprotocol/server-gdrive) | BBB | 0 | n/a |
| Box Japan | Storage | Official (box/mcp-server-box-remote) | BBB | 12 | 67% |
| Google Workspace | Productivity | Third-party + Claude native connector | BBB | 2 | 100% |
| Microsoft 365 (OneDrive/SharePoint) | Productivity | Official Work IQ MCP (preview) | BBB | — | — |
| Amazon S3 | Storage | AWS MCP Server (2026-05-06 GA) | BB | 0 | n/a |
| Cloudflare R2 | Storage | Cloudflare API MCP + dedicated R2 MCP | BB | — | — |
"—" and "n/a" indicate that KanseiLink hasn't accumulated enough self-reported agent data to set a grade with confidence. The services are still listed as connectable, but a small PoC to gather metrics is wise before a production rollout.
Dropbox — the remote MCP server that landed in March 2026
The biggest shift in 2026 belongs to Dropbox. Its official remote MCP server entered beta on March 18, 2026, documented at help.dropbox.com/integrations/connect-dropbox-mcp-server. It supports Dynamic Client Registration and connects directly to Claude, ChatGPT, Cursor, and other major MCP clients.
KanseiLink's Dropbox Business measurements stand at 3 reports / 67% success / BBB. The sample is small, but the basic operations — file upload, folder search, share link creation, document management — are available in natural language. Note that Dropbox Dash (Dropbox's own AI search product) ships a separate MCP server, so pick the one that matches your use case.
・You already use Dropbox Business as the internal file hub
・You want a remote (hosted) MCP to minimize ops overhead
・You need the same file set accessible from multiple MCP clients (Claude, ChatGPT, Cursor)
Box — the enterprise MCP pick
Box made the most progress on enterprise content management (ECM) in 2026. The official Box MCP server is introduced at box.com/mcp-server, with two flavors: a remote hosted variant (github.com/box/mcp-server-box-remote) and a self-hosted Python project (github.com/box-community/mcp-server-box).
Box's edge is the design choice to expose AI access while honoring native permissions and governance. Multi-file analysis, metadata extraction, advanced search — features that matter at enterprise scale — show up as MCP tools. It already supports Anthropic Claude, Microsoft Copilot Studio, Microsoft Azure API Center, and Mistral Le Chat. Salesforce Agentforce and GitHub Copilot are on the announced roadmap.
KanseiLink's reading is 12 reports / 67% success / BBB. Auth is OAuth 2.0 through the Box Developer Console. In Japan (Box Japan), Box positions itself as the "No.1 enterprise file storage" for finance, manufacturing, and public-sector compliance — which makes it the default first pick for AI agents in regulated industries.
Remote (box/mcp-server-box-remote): hosted by Box, also available via AWS Marketplace. The standard pick when you don't want to operate the server.
Self-hosted (box-community/mcp-server-box, Python): when you need to keep it inside your VPC or extend it. The right choice for regulated industries with strict governance requirements.
Google Drive and Workspace — third-party MCP plus native connector
Google Drive sits in a distinctive position: no first-party MCP server from Google, but Claude's native Google Workspace connector (added February 24, 2026) plus a third-party reference MCP cover almost the same surface in practice.
The de facto reference is Anthropic's modelcontextprotocol/server-gdrive (run via npx), focused on file/folder search and reads. For write paths or richer operations, community implementations are the practical answer in 2026 — isaacphi/mcp-gdrive (extends to Google Sheets edits) and piotr-agier/google-drive-mcp (unifies Drive, Docs, Sheets, Slides, and Calendar) are common picks.
Claude's native Google Workspace connector (added February 24, 2026) works on text extraction. It can read file contents in Drive but cannot give Claude file-system control — "ask Claude to reorganize folders" or "auto-move/copy files" is out of scope. The rule of thumb: use the MCP server when you want the agent to act on the file system, and the native connector when you want quoting and search.
GitHub issue anthropics/claude-code #53442 reports "Cowork Google Drive MCP cannot see content in any Workspace Shared Drive." Personal Drive (My Drive) appears as expected, while files under Shared Drives can be invisible. For enterprise rollouts, plan your PoC against Shared Drive content. If files don't surface, check OAuth scopes — drive rather than drive.readonly — as the first thing.
Microsoft 365 / OneDrive — legacy MCP deprecated, Work IQ takes over
Microsoft deprecated the legacy SharePoint and OneDrive MCP server (odspremoteserver) on March 13, 2026, splitting it into two preview servers: Work IQ SharePoint MCP and Work IQ OneDrive MCP. Existing connections continue to work, but new setups must use the new servers.
The new servers run as auditable tool sets through the Agent 365 tooling gateway. Work IQ SharePoint covers file listing, metadata retrieval, search, upload, and list management; Work IQ OneDrive handles personal OneDrive file and folder operations. Anthropic Claude's Microsoft 365 connector ties SharePoint, Teams, Outlook, and OneDrive through OAuth 2.0 (encrypted token storage) and automates eight workflows including document analysis, email insights, and meeting summaries.
Any agent built after March 13, 2026 should target the new Work IQ family. Tutorials and sample code referencing the old odspremoteserver are still scattered across the web — copying one of those into production sets a clock against the deprecation window.
S3 and R2 — agents talking to object storage
Beyond "file-sharing SaaS", object storage talked to directly by agents also matured in 2026.
AWS S3 got the AWS MCP Server (part of the Agent Toolkit for AWS) reaching general availability on May 6, 2026. It's available in US East (N. Virginia) and Europe (Frankfurt), with API calls allowed to any region. The server ships SQL-capable S3 Tables queries, CSV-to-table conversion, metadata discovery, and a sandboxed server-side run_script tool, plus improvements like IAM context keys, no-auth documentation retrieval, and reduced token usage per interaction. It works with Claude Code, Kiro, Cursor, and any MCP-compatible client. The AWS MCP server itself has no additional charge — you pay only for AWS resources you create and any data transfer.
Cloudflare R2 exposes an S3-compatible API and is reachable with low latency from 335+ data centers. Agent connectivity comes in two flavors: (1) the Cloudflare API MCP server, which wraps 2,500+ endpoints behind two tools — search() and execute() — and (2) third-party adapters such as Pipedream's Cloudflare R2 MCP Server. The killer feature is zero-egress pricing, which is a big deal for read-heavy agent workloads: RAG source stores, log analysis, archived scrape outputs.
Selection flow by use case
There's no single "always pick this" answer, but the flow below covers the majority of cases.
- Enterprise, regulated industry, strict permission model → Official Box MCP (remote or self-hosted)
- Microsoft 365 tenant with SharePoint as the system of record → Work IQ SharePoint/OneDrive MCP (new family)
- Google Workspace day-to-day, quoting and search are the main use case → Claude's native Google Workspace connector
- Google Drive with autonomous file manipulation → modelcontextprotocol/server-gdrive or isaacphi/mcp-gdrive
- Dropbox Business shop, minimize ops via remote MCP → Official Dropbox remote MCP (β)
- RAG source store, minimize egress costs → Cloudflare R2 + Cloudflare API MCP
- Inside the AWS estate, want S3 Tables / SQL → AWS MCP Server (GA 2026-05-06)
FAQ
Which cloud storage should I reach for first when building an AI agent?
It depends. Internal knowledge access on top of Google Workspace → Google Drive MCP (modelcontextprotocol/server-gdrive). Strict enterprise permissions → official Box MCP. Microsoft 365 tenant → Work IQ SharePoint/OneDrive MCP. S3-compatible object storage → Cloudflare R2 MCP or AWS MCP Server (GA 2026-05-06).
Did Dropbox ship an official MCP server in 2026?
Yes. The official remote MCP server entered beta on March 18, 2026, with Dynamic Client Registration support. It connects to Claude, ChatGPT, Cursor, and other MCP clients, documented at help.dropbox.com.
I heard the OneDrive/SharePoint MCP is deprecated.
Microsoft deprecated the legacy 'SharePoint and OneDrive MCP server' on March 13, 2026 and split it into two preview servers — Work IQ SharePoint MCP and Work IQ OneDrive MCP. Existing connections still work, but new setups must use the new family.
Where is the 'official' Box MCP server?
Two official paths from Box: box/mcp-server-box-remote (remote hosted, also on AWS Marketplace) and box-community/mcp-server-box (self-hosted Python). It supports Anthropic Claude, Microsoft Copilot Studio, and Mistral Le Chat.
Can agents talk to S3-compatible storage too?
Yes. The AWS MCP Server reached GA on May 6, 2026 with S3 Tables/SQL queries, CSV-to-table conversion, and metadata discovery. Cloudflare R2 exposes an S3-compatible API reachable via the Cloudflare API MCP or third-party adapters. R2's zero-egress pricing is a big cost win.
How should I read the "no data" entries?
"—" / "n/a" means KanseiLink hasn't gathered enough self-reported agent data to score the service confidently. It's not a quality verdict — run a small PoC to gather metrics before a production rollout. You can contribute measurements back via the report_outcome tool.
Figures are pulled from KanseiLink MCP's search_services and get_insights tools (April 2026 snapshot): Dropbox Business (n=3, 67%, BBB), Box Japan (n=12, 67%, BBB), Google Workspace (n=2, 100%, BBB), Google Drive (n=0, BBB), Microsoft 365 (n=0), Amazon S3 (n=0, BB), Cloudflare R2 (n=0, BB). The Dropbox remote MCP beta date (March 18, 2026) comes from help.dropbox.com/integrations/connect-dropbox-mcp-server; the official Box MCP from box.com/mcp-server; the Microsoft 365 MCP deprecation (March 13, 2026) from learn.microsoft.com/en-us/microsoft-agent-365/mcp-server-reference/odspremoteserver; the AWS MCP Server GA (May 6, 2026) from aws.amazon.com/blogs/aws/the-aws-mcp-server-is-now-generally-available/; the Claude Google Workspace connector (added February 24, 2026) from fast.io/resources/connect-claude-google-drive/. Sparsely-sampled rows may shift as more data accrues — always confirm against vendor docs before production use.