Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/zebbern/claude-code-guide/r2-uploadnpx skills add zebbern/claude-code-guide --skill r2-uploadgit clone --depth 1 https://github.com/zebbern/claude-code-guideWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00089 | $0.00921 |
| Opus 5 | $0.00044 | $0.00461 |
| Sonnet 5 | $0.00018 | $0.00184 |
| Haiku 4.5 | $0.00009 | $0.00092 |
Grade A, and why
r2-upload scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 122 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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
- Go to Cloudflare Dashboard → R2
- Create a bucket
- Go to R2 API Tokens:
https://dash.cloudflare.com/<ACCOUNT_ID>/r2/api-tokens - Create a new API token
- Important: Apply to specific bucket (select your bucket)
- Permissions: Object Read & Write
- Copy the Access Key ID and Secret Access Key
- Use endpoint format:
https://<account_id>.r2.cloudflarestorage.com - 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
Usage
Upload a file
r2-upload /path/to/file.pdf
# Returns: https://files.example.com/abc123/file.pdf?signature=...
Upload with custom path
r2-upload /path/to/file.pdf --key uploads/2026/file.pdf
Upload to specific bucket
r2-upload /path/to/file.pdf --bucket personal
What ships with it
10 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 3d ago First seen · 122 lines · 89 tokens per session scan A 1a3649c2742c
r2-upload is a skill published in the GitHub repository zebbern/claude-code-guide (4,597 stars, last pushed yesterday), licensed MIT. It adds 89 tokens to every session and 921 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
aws-solution-architect
../../../engineering-team/skills/aws-solution-architect/SKILL.md.
azure-cloud-architect
../../../engineering-team/skills/azure-cloud-architect/SKILL.md.
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cdb-scan
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exam-coach
Quiz and coach the user for the Anthropic Claude certification exams using this repository's blueprints and official exam guides. Use when the user asks to practice, be quizzed, drill a domain, take a mock exam, or prepare for the Associate, Developer, or Architect certifications.