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Head to head · Storage presigned · October 2026 research run

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.

Azure Blob StorageMicrosoft Corporation · HTTP API BB75.7/100#40 of 841 OneDrive and SharePoint files (Microsoft Graph)Microsoft · HTTP API B65.3/100#296 of 841

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.

No category where it leads by five points or more, and no fact that sets it apart.

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

CategoryWeight this runAzure Blob StorageOneDrive and SharePoint files (Microsoft Graph)Edge
Reliability16%208864Azure Blob Storage +24
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28589OneDrive and SharePoint files (Microsoft Graph) +4
Agent ergonomics13%16.28484even
Security & auth14%17.58173Azure Blob Storage +8
Payments & pricing10%12.52020even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88075Azure Blob Storage +5
Transparency & trust7%8.88075Azure Blob Storage +5
Negative events≤150-4
Total75.7 · BB65.3 · B

Facts side by side

FactAzure Blob StorageOneDrive and SharePoint files (Microsoft Graph)
KindHTTP APIHTTP API
VendorMicrosoft CorporationMicrosoft
Hosted endpointhttps://<account>.blob.core.windows.nethttps://graph.microsoft.com/v1.0
TransportsHTTPHTTP
AuthOAuth or keyOAuth
PricingPay per useYour plan
x402nono
LicenceProprietary service under Microsoft's Product Terms. The Azure SDK client libraries are MITMIT (SDKs)
Read-only variant documentednono
llms.txtnono
Last release2026-09-302026-10-06
Terms last updatedno date given2025-10-01
Privacy policy last updated2026-09-012026-09-01
Customer content may train modelsyesyes
Terms restrict automated accessyesyes
Terms restrict benchmarkingyesyes
Terms or service can change without noticenot found in the textyes
Arbitration or class-action waivernot found in the textnot found in the text
Popularity12.5M npm/wk, 22.6M PyPI/wk633 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.

Other comparisons with Azure Blob Storage or OneDrive and SharePoint files (Microsoft Graph)

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