# Azure Blob Storage vs OneDrive and SharePoint files (Microsoft Graph)

> Azure Blob Storage scores 75.7 (BB) on agent readiness against OneDrive and SharePoint files (Microsoft Graph)'s 65.3 (B), and leads in 4 of 7 scored categories. Both do storage presigned. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/azure-blob-storage-vs-onedrive-sharepoint
- Markdown: https://www.anchorterminal.com/compare/azure-blob-storage-vs-onedrive-sharepoint.md (~2,550 tokens)
- Slim: https://www.anchorterminal.com/compare/azure-blob-storage-vs-onedrive-sharepoint.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
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- 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

Azure Blob Storage scores 75.7 (BB) on agent readiness against OneDrive and SharePoint files (Microsoft Graph)'s 65.3 (B), and leads in 4 of 7 scored categories. Both do storage presigned.

- Azure Blob Storage: grade BB, 75.7/100, rank #40 of 842. Markdown https://www.anchorterminal.com/tools/azure-blob-storage.md · JSON https://www.anchorterminal.com/api/v1/tools/azure-blob-storage.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

### Azure Blob Storage (BB)

Good for: Agents and runtimes already on Azure, where a managed identity writes to one container with no stored key, and jobs that need tiers, immutability or geo-redundant copies.

Ahead on:
- Reliability, 88 against 64
- Security & auth, 81 against 73
- Maintenance & community, 80 against 75
- Transparency & trust, 80 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: Shared Key authorisation with the account's access keys is allowed until the owner sets `AllowSharedKeyAccess` to false

### 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 | Azure Blob Storage | OneDrive and SharePoint files (Microsoft Graph) | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 88 | 64 | Azure Blob Storage +24 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 85 | 89 | OneDrive and SharePoint files (Microsoft Graph) +4 |
| Agent ergonomics | 13% (16.2 this run) | 84 | 84 | even |
| Security & auth | 14% (17.5 this run) | 81 | 73 | Azure Blob Storage +8 |
| Payments & pricing | 10% (12.5 this run) | 20 | 20 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 80 | 75 | Azure Blob Storage +5 |
| Transparency & trust | 7% (8.8 this run) | 80 | 75 | Azure Blob Storage +5 |
| Negative events | ≤15 | 0 | -4 | |
| **Total** | | **75.7 · BB** | **65.3 · B** | |

## Facts side by side

| Fact | Azure Blob Storage | OneDrive and SharePoint files (Microsoft Graph) |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Microsoft Corporation | Microsoft |
| Hosted endpoint | `https://<account>.blob.core.windows.net` | `https://graph.microsoft.com/v1.0` |
| Transports | HTTP | HTTP |
| Auth | OAuth or key | OAuth |
| Pricing | Pay per use | Your plan |
| x402 | no | no |
| Licence | Proprietary service under Microsoft's Product Terms. The Azure SDK client libraries are MIT | MIT (SDKs) |
| Read-only variant documented | no | no |
| llms.txt | no | no |
| Last release | 2026-09-30 | 2026-10-06 |
| Terms last updated | no date given | 2025-10-01 |
| Privacy policy last updated | 2026-09-01 | 2026-09-01 |
| Customer content may train models | yes | yes |
| Terms restrict automated access | yes | yes |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 12.5M npm/wk, 22.6M PyPI/wk | 633 stars, 2.9M npm/wk, 1.6M PyPI/wk |

## Verdicts

**Azure Blob Storage.** Microsoft Entra ID roles can be scoped to one container, and a user delegation signature hands out a link that expires within seven days. Account keys with full access stay enabled until the owner turns them off, request logs are off until configured, and an Azure account needs a person, a phone number and a payment card.

**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

### Azure Blob Storage

1. Request an Entra ID token for https://storage.azure.com/ and send it as a Bearer header with `x-ms-version` and `x-ms-date`. Put Blob also needs `x-ms-blob-type: BlockBlob`
2. Ask for a Storage Blob Data role on the one container. Role changes can take up to 10 minutes to apply
3. To share a file, call Get User Delegation Key, then sign a SAS with `sp=r`, `spr=https` and a short expiry. Treat the URL as a secret
4. Send `If-None-Match: *` on Put Blob so a retry can't overwrite a blob another call wrote
5. On 503 ServerBusy back off exponentially. After 500 OperationTimedOut check the blob's state before retrying, since the write may have succeeded

### 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, Azure Blob Storage or OneDrive and SharePoint files (Microsoft Graph)?

Azure Blob Storage scores 75.7 (BB) on agent readiness against OneDrive and SharePoint files (Microsoft Graph)'s 65.3 (B), and leads in 4 of 7 scored categories.

### Do Azure Blob Storage and OneDrive and SharePoint files (Microsoft Graph) need an API key?

Azure Blob Storage takes an API key or an OAuth sign-in. OneDrive and SharePoint files (Microsoft Graph) uses an OAuth sign-in.

### Can an agent call Azure Blob Storage and OneDrive and SharePoint files (Microsoft Graph) without installing anything?

Yes. Azure Blob Storage has a hosted endpoint at https://<account>.blob.core.windows.net 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/azure-blob-storage-vs-onedrive-sharepoint.json, and with the fewest tokens: https://www.anchorterminal.com/compare/azure-blob-storage-vs-onedrive-sharepoint.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "azure-blob-storage", "b": "onedrive-sharepoint"}`. From a terminal: `anchor compare azure-blob-storage onedrive-sharepoint`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/azure-blob-storage.json and https://www.anchorterminal.com/api/v1/tools/onedrive-sharepoint.json

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