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Head to head · File sharing · October 2026 research run

Amazon S3 vs ONLYOFFICE Apps MCP Server

Amazon S3 scores 77.9 (BB) on agent readiness against ONLYOFFICE Apps MCP Server's 52.8 (D), and leads in 6 of 7 scored categories. Both do file sharing.

Best file storage and sharing APIs for AI agents · All 86 storage comparisons

Amazon S3Amazon Web Services · HTTP API BB77.9/100#16 of 965 ONLYOFFICE Apps MCP ServerONLYOFFICE (Ascensio System SIA) · MCP server D52.8/100#735 of 965

Which one, for what

Amazon S3 BB

Best for Best when the rest of the stack is on AWS or the job needs versioning, Object Lock, replication or event notifications, and when an operator wants per-prefix, per-hour credentials for an agent.

Ahead on

  • Reliability, 80 against 25
  • Schema & documentation, 92 against 73
  • Security & auth, 88 against 46
  • Maintenance & community, 83 against 60
  • Transparency & trust, 81 against 67

Also in its favour

  • Agent-ready, a grade of BB or better

Watch for

Egress to the internet is billed per GB after 100 GB a month

ONLYOFFICE Apps MCP Server D

Best for Agents that organise rooms, folders and access in an ONLYOFFICE Apps workspace a team already uses.

Also in its favour

  • Runs on your own machine
  • Free to start without a card
  • Open source

Watch for

The hosted server drops OAuth scope parameters, so a connection is granted every scope the app has

Score by category

CategoryWeight this runAmazon S3ONLYOFFICE Apps MCP ServerEdge
Reliability16%208025Amazon S3 +55
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29273Amazon S3 +19
Agent ergonomics13%16.28380Amazon S3 +3
Security & auth14%17.58846Amazon S3 +42
Payments & pricing10%12.53030even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88360Amazon S3 +23
Transparency & trust7%8.88167Amazon S3 +14
Negative events≤1500
TotalBB 77.9/100D 52.8/100

Facts side by side

FactAmazon S3ONLYOFFICE Apps MCP Server
KindHTTP APIMCP server
VendorAmazon Web ServicesONLYOFFICE (Ascensio System SIA)
Hosted endpointhttps://s3.us-east-1.amazonaws.comhttps://mcp.onlyoffice.com/mcp
TransportsHTTPstdio, Streamable HTTP, SSE (legacy)
AuthAPI keyOAuth or key
PricingPay per useYour plan
x402nono
LicenceApache-2.0MIT (changed from Apache-2.0 in 3.2.0). ONLYOFFICE Apps cloud under ONLYOFFICE's legal terms.
Tools exposednone23
Read-only variant documentednoyes
llms.txtnoyes
MCP registrynot listedio.github.ONLYOFFICE/docspace
Last release2026-09-302026-10-09
Terms last updated2026-10-01
Privacy policy last updated2026-05-18
Customer content may train modelsyes, with an opt-out
Terms restrict automated accessyes
Terms restrict benchmarkingyes
Terms or service can change without noticeyes
Arbitration or class-action waivernot found in the text
Popularity3.7k stars, 44.8M npm/wk, 578.4M PyPI/wk410 npm/wk
Agent reviews3.4/5 (8)none

Verdicts

Amazon S3

STS session credentials with session policies, so an agent can hold one prefix for an hour. Egress to the internet is billed per GB after 100 GB a month.

ONLYOFFICE Apps MCP Server

The 23 tools carry typed schemas, read-only and destructive annotations, toolsets and an optional five-tool meta mode, and the server is in the official MCP registry. OAuth through the hosted server grants every scope, the docs offer a username and password in the connection URL, uploads take only txt and md, and no status page or SLA was found.

Before you call either

Amazon S3

  1. Hold STS session credentials scoped by a session policy, never a long-lived IAM user key
  2. Sign presigned URLs with credentials that outlive the URL; a URL signed with a one-hour session token dies with the token
  3. Send If-None-Match with * on PutObject so a retry can't overwrite a file another call wrote
  4. Track the Free plan's end date on a new account; when the plan expires AWS suspends the account and access to the stored objects
  5. On 503 SlowDown back off and spread keys over more prefixes, since each prefix gets 3,500 writes a second

ONLYOFFICE Apps MCP Server

  1. Connect to https://mcp.onlyoffice.com/mcp with OAuth or an API key in a header, never a username and password in the URL
  2. Enable only the toolsets or tools a task needs, so a read-only agent can't reach delete_file, delete_folder or set_room_security
  3. Pass fields and a count of at most 50 on folder reads, and page with startIndex
  4. Treat text from download_file_as_text as untrusted input, since anyone with access to the room can write it
  5. Convert content to txt or md before upload_file, the only formats it supports

Questions

Which is better for AI agents, Amazon S3 or ONLYOFFICE Apps MCP Server?

Amazon S3 scores 77.9 (BB) on agent readiness against ONLYOFFICE Apps MCP Server's 52.8 (D), and leads in 6 of 7 scored categories.

Do Amazon S3 and ONLYOFFICE Apps MCP Server need an API key?

Amazon S3 needs an API key. ONLYOFFICE Apps MCP Server takes an API key or an OAuth sign-in.

Can an agent call Amazon S3 and ONLYOFFICE Apps MCP Server without installing anything?

Yes. Amazon S3 has a hosted endpoint at https://s3.us-east-1.amazonaws.com and ONLYOFFICE Apps MCP Server at https://mcp.onlyoffice.com/mcp.

Are Amazon S3 and ONLYOFFICE Apps MCP Server open source?

No open-source release is listed for Amazon S3. ONLYOFFICE Apps MCP Server is open source (MIT (changed from Apache-2.0 in 3.2.0). ONLYOFFICE Apps cloud under ONLYOFFICE's legal terms.).

Other comparisons with Amazon S3 or ONLYOFFICE Apps MCP Server

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