AWS S3 Management via MCP

Use this skill when you need to manage S3 buckets, browse objects, upload/download files, or generate presigned URLs.

Available Tools

Workflow

1. Start with list_buckets to discover available buckets
2. Use list_objects with a prefix to browse directories within a bucket
3. get_object reads text content — for binary files, use presigned_url instead
4. presigned_url generates a temporary shareable link (default 1 hour expiry)

Key Patterns

• list_objects uses prefix-based filtering (S3 doesn't have real directories): prefix: "uploads/2026/"
• get_object returns text content only — it won't work for images, binaries, or large files
• put_object takes string content — use it for config files, JSON, text, not binary uploads
• presigned_url is the right tool for sharing files or accessing binary content

Safety

• Always confirm before delete_object — S3 deletions are permanent (unless versioning is enabled)
• Always confirm before put_object to an existing key — it overwrites without warning
• Presigned URLs grant temporary access to anyone with the link — warn users about this