# Best File Storage Tools for AI Agents (2026)

Cloud storage, file management, CDN

| # | Tool | Grade | Score | Biggest Friction |
|---|------|-------|-------|-----------------|
| 1 | AWS S3 | B+ | 7.82 | Lack of an OpenAPI specification and robots.txt blocking prevents agents from automatically discovering API capabilities, requiring hardcoded knowledge of S3 operations. |
| 2 | Backblaze B2 | B+ | 7.1 | Lack of OpenAPI specification and absence of webhooks/event streaming forces agents to use polling and manual API documentation review rather than automatic spec discovery and reactive architecture. |
| 3 | Uploadcare | B | 6.18 | Absence of an OpenAPI specification and MCP server support significantly limits Uploadcare's integration with modern AI agent frameworks and discovery by autonomous systems. |
| 4 | UploadThing | C+ | 5.86 | Absence of OpenAPI specification and published API documentation prevents agents from autonomously discovering endpoints, request formats, and response schemas needed for reliable integration. |
| 5 | Wasabi | F | 2.86 | Complete absence of an OpenAPI specification and documented REST API makes programmatic integration extremely difficult and discovery nearly impossible for AI agents. |

Updated: 2026-04-09
Source: https://agenttool.sh/best/file-storage