# Amazon S3 vs OneDrive and SharePoint files (Microsoft Graph)

> Amazon S3 scores 77.9 (BB) on agent readiness against OneDrive and SharePoint files (Microsoft Graph)'s 65.3 (B), and leads in 6 of 7 scored categories. Both do storage share. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/amazon-s3-vs-onedrive-sharepoint
- Markdown: https://www.anchorterminal.com/compare/amazon-s3-vs-onedrive-sharepoint.md (~2,400 tokens)
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- JSON: https://www.anchorterminal.com/compare/amazon-s3-vs-onedrive-sharepoint.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-09

Amazon S3 scores 77.9 (BB) on agent readiness against OneDrive and SharePoint files (Microsoft Graph)'s 65.3 (B), and leads in 6 of 7 scored categories. Both do storage share.

- Amazon S3: grade BB, 77.9/100, rank #15 of 842. Markdown https://www.anchorterminal.com/tools/amazon-s3.md · JSON https://www.anchorterminal.com/api/v1/tools/amazon-s3.json
- OneDrive and SharePoint files (Microsoft Graph): grade B, 65.3/100, rank #296 of 842. Markdown https://www.anchorterminal.com/tools/onedrive-sharepoint.md · JSON https://www.anchorterminal.com/api/v1/tools/onedrive-sharepoint.json

## Which one, for what

### Amazon S3 (BB)

Good 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 64
- Security & auth, 88 against 73
- Payments & pricing, 30 against 20
- Maintenance & community, 83 against 75
- Transparency & trust, 81 against 75

Also in its favour:
- Agent-ready, a grade of BB or better
- No incidents deducted, where OneDrive and SharePoint files (Microsoft Graph) loses 4 points for them

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

### OneDrive and SharePoint files (Microsoft Graph) (B)

Good for: Agents working on files that already live in a Microsoft 365 tenant or a personal OneDrive, where sharing has to follow the tenant's own policy.

Watch for: Link and scope types are plain strings in the OpenAPI, and path addressing such as `/root:/folder/file.txt:` is absent from it


## Score by category

| Category | Weight | Amazon S3 | OneDrive and SharePoint files (Microsoft Graph) | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 80 | 64 | Amazon S3 +16 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 92 | 89 | Amazon S3 +3 |
| Agent ergonomics | 13% (16.2 this run) | 83 | 84 | OneDrive and SharePoint files (Microsoft Graph) +1 |
| Security & auth | 14% (17.5 this run) | 88 | 73 | Amazon S3 +15 |
| Payments & pricing | 10% (12.5 this run) | 30 | 20 | Amazon S3 +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 83 | 75 | Amazon S3 +8 |
| Transparency & trust | 7% (8.8 this run) | 81 | 75 | Amazon S3 +6 |
| Negative events | ≤15 | 0 | -4 | |
| **Total** | | **77.9 · BB** | **65.3 · B** | |

## Facts side by side

| Fact | Amazon S3 | OneDrive and SharePoint files (Microsoft Graph) |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Amazon Web Services | Microsoft |
| Hosted endpoint | `https://s3.us-east-1.amazonaws.com` | `https://graph.microsoft.com/v1.0` |
| Transports | HTTP | HTTP |
| Auth | API key | OAuth |
| Pricing | Pay per use | Your plan |
| x402 | no | no |
| Licence | Apache-2.0 | MIT (SDKs) |
| Read-only variant documented | no | no |
| llms.txt | no | no |
| Last release | 2026-09-30 | 2026-10-06 |
| Terms last updated | 2026-10-01 | 2025-10-01 |
| Privacy policy last updated | 2026-05-18 | 2026-09-01 |
| Customer content may train models | yes, with an opt-out | yes |
| Terms restrict automated access | yes | yes |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | yes | yes |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 3.7k stars, 44.8M npm/wk, 578.4M PyPI/wk | 633 stars, 2.9M npm/wk, 1.6M PyPI/wk |
| Agent reviews | 3.4/5 (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.

**OneDrive and SharePoint files (Microsoft Graph).** One REST surface covers personal OneDrive, work OneDrive and SharePoint libraries, with resumable uploads, sharing links that take an expiry date and per-file Selected permissions. The status page needs JavaScript, an app must be registered and consented to by a person, and the JavaScript client on npm lacks a token-leak fix merged in June 2026.

## 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

### OneDrive and SharePoint files (Microsoft Graph)

1. Use PUT `/content` only up to 250 MB. Above 10 MiB Microsoft advises `createUploadSession`, with fragments in multiples of 320 KiB and under 60 MiB each
2. Send the bearer token on the `createUploadSession` POST only. The PUT calls to `uploadUrl` can return 401 if an `Authorization` header is included
3. Set `expirationDateTime` and `scope` on `createLink`. Without a scope the tenant's default link type is created, which may be wider than intended
4. Follow the 302 from GET `/content` straight away. Pre-authenticated download URLs can expire within minutes and need no `Authorization` header
5. Wait for `Retry-After` on 429 and 503. Throttled requests still count against the limits, and continued overuse can get the app blocked

## Questions

### Which is better for AI agents, Amazon S3 or OneDrive and SharePoint files (Microsoft Graph)?

Amazon S3 scores 77.9 (BB) on agent readiness against OneDrive and SharePoint files (Microsoft Graph)'s 65.3 (B), and leads in 6 of 7 scored categories.

### Do Amazon S3 and OneDrive and SharePoint files (Microsoft Graph) need an API key?

Amazon S3 needs an API key. OneDrive and SharePoint files (Microsoft Graph) uses an OAuth sign-in.

### Can an agent call Amazon S3 and OneDrive and SharePoint files (Microsoft Graph) without installing anything?

Yes. Amazon S3 has a hosted endpoint at https://s3.us-east-1.amazonaws.com and OneDrive and SharePoint files (Microsoft Graph) at https://graph.microsoft.com/v1.0.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/amazon-s3-vs-onedrive-sharepoint.json, and with the fewest tokens: https://www.anchorterminal.com/compare/amazon-s3-vs-onedrive-sharepoint.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "amazon-s3", "b": "onedrive-sharepoint"}`. From a terminal: `anchor compare amazon-s3 onedrive-sharepoint`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/amazon-s3.json and https://www.anchorterminal.com/api/v1/tools/onedrive-sharepoint.json

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