Agent-Skills.md

Agent Skills: Send Me My Files - R2 Upload with Short Lived Signed URLs

Upload files to Cloudflare R2, AWS S3, or any S3-compatible storage (like MinIO) and generate secure, time-limited presigned download links with configurable expiration, typically set to 5 minutes. Use when the user needs to upload a file to cloud storage and get a shareable link, or mentions R2, S3, presigned URLs, temporary links, or file uploads with expiration.

ID: zebbern/claude-code-guide/r2-upload

Repository

zebbern/claude-code-guide
zebbernLicense: MIT
4,638469

Install this agent skill to your local

npx skills add zebbern/claude-code-guide --skill r2-upload

Skill Files

The files that make up r2-upload.

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skills/r2-upload/SKILL.md

Skill Metadata

Name
r2-upload
Description
Upload files to Cloudflare R2, AWS S3, or any S3-compatible storage (like MinIO) and generate secure, time-limited presigned download links with configurable expiration, typically set to 5 minutes. Use when the user needs to upload a file to cloud storage and get a shareable link, or mentions R2, S3, presigned URLs, temporary links, or file uploads with expiration.

Send Me My Files - R2 Upload with Short Lived Signed URLs

Upload files to Cloudflare R2 or any S3-compatible storage and generate presigned download links.

Features

  • Upload files to R2/S3 buckets
  • Generate presigned download URLs (configurable expiration)
  • Support for any S3-compatible storage (R2, AWS S3, MinIO, etc.)
  • Multiple bucket configurations
  • Automatic content-type detection

Configuration

Create ~/.r2-upload.yml (or set R2_UPLOAD_CONFIG env var):

# Default bucket (used when no bucket specified)
default: my-bucket

# Bucket configurations
buckets:
  my-bucket:
    endpoint: https://abc123.r2.cloudflarestorage.com
    access_key_id: your_access_key
    secret_access_key: your_secret_key
    bucket_name: my-bucket
    public_url: https://files.example.com  # Optional: custom domain
    region: auto  # For R2, use "auto"

  # Additional buckets
  personal:
    endpoint: https://xyz789.r2.cloudflarestorage.com
    access_key_id: ...
    secret_access_key: ...
    bucket_name: personal-files
    region: auto

Cloudflare R2 Setup

  1. Go to Cloudflare Dashboard → R2
  2. Create a bucket
  3. Go to R2 API Tokens: https://dash.cloudflare.com/<ACCOUNT_ID>/r2/api-tokens
  4. Create a new API token
    • Important: Apply to specific bucket (select your bucket)
    • Permissions: Object Read & Write
  5. Copy the Access Key ID and Secret Access Key
  6. Use endpoint format: https://<account_id>.r2.cloudflarestorage.com
  7. Set region: auto

AWS S3 Setup

aws-bucket:
  endpoint: https://s3.us-east-1.amazonaws.com
  access_key_id: ...
  secret_access_key: ...
  bucket_name: my-aws-bucket
  region: us-east-1

Setup

This skill is a stdio MCP server, not a shell command (there is no r2-upload binary). Build it once and register it with Claude Code:

cd "${CLAUDE_SKILL_DIR}" && npm install && npm run build
claude mcp add r2-upload -- node "${CLAUDE_SKILL_DIR}/dist/index.js"

Run npm run onboard in the same folder to create ~/.r2-upload.yml interactively.

Tools

  • r2_upload - Upload file_path and return a presigned URL. Optional: key (custom object path), bucket, expires (300, 24h, 1d; default 5m), public (unsigned URL, needs a public bucket), content_type
  • r2_list - List files in a bucket (bucket, prefix, max_keys)
  • r2_delete - Delete a file by key
  • r2_generate_url - Generate a new presigned URL for an existing key

Environment Variables

  • R2_UPLOAD_CONFIG - Path to config file (default: ~/.r2-upload.yml)
  • R2_DEFAULT_BUCKET - Override default bucket

Notes

  • Uploaded files are stored with their original filename unless key is specified
  • Automatic UUID prefix added to prevent collisions (e.g., abc123/file.pdf)
  • Content-Type automatically detected from file extension
  • Presigned URLs expire after the configured duration

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