What is designing-vpcs?

A guide for designing virtual private clouds, or VPCs: isolated sections of a cloud network for services and environments such as production, testing, and development.

Use it to design subnets, separate web, application, and data tiers, isolate environments, plan regional networks, and decide where VPC peering is needed.

It helps plan network boundaries and address ranges before services are connected, reducing accidental exposure and future address conflicts.

designing-vpcs — Skill for Claude Code by iamnolanhu

Install

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.

Any agent

npx skills add iamnolanhu/digitalocean-skills --skill designing-vpcs

Clone the repo

git clone --depth 1 https://github.com/iamnolanhu/digitalocean-skills

Made for: Claude Code.

Or install digitalocean-skills, the plugin that ships this one along with the rest of its 9 skills, 6 commands, 3 agents, 1 hook.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/iamnolanhu/digitalocean-skills/designing-vpcs/github.svg)](https://agentmods.dev/skills/iamnolanhu/digitalocean-skills/designing-vpcs)

Your own site

<a href="https://agentmods.dev/skills/iamnolanhu/digitalocean-skills/designing-vpcs"><img src="https://agentmods.dev/badge/skills/iamnolanhu/digitalocean-skills/designing-vpcs/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/iamnolanhu/digitalocean-skills/designing-vpcs"><img src="https://agentmods.dev/badge/skills/iamnolanhu/digitalocean-skills/designing-vpcs.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 52 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,489 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What 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 5.1	$0.00052	$0.01489
Opus 5	$0.00026	$0.00745
Sonnet 5	$0.00010	$0.00298
Haiku 4.5	$0.00005	$0.00149

Measured 11d ago against content hash b9ac1dc5cfe9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

designing-vpcs scanned grade A with 1 finding 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 11d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -s -H "Authorization: Bearer $DIGITALOCEAN_API_TOKEN" \

skills/designing-vpcs/SKILL.md · 197 lines

How it starts

The opening of the file, as written. The whole thing — 197 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Designing VPCs

Design secure, scalable VPC architectures following network segmentation best practices.

When to Use

Setting up new infrastructure
Isolating environments (prod/staging/dev)
Connecting services across regions
Planning network architecture
User mentions: "VPC", "private network", "isolate", "network design"

VPC Architecture Principles

Segment by environment - Production isolated from non-production
Segment by tier - Web, app, data in logical groups
Minimal peering - Only peer what's necessary
Document CIDR blocks - Avoid overlaps for future peering

CIDR Planning

Single-Region Design

10.10.0.0/16 - Production VPC (65,536 IPs)
  10.10.1.0/24 - Public tier (load balancers)
  10.10.10.0/24 - Web tier
  10.10.20.0/24 - App tier
  10.10.30.0/24 - Data tier

10.20.0.0/16 - Staging VPC
  10.20.1.0/24 - Public
  10.20.10.0/24 - Web tier
  10.20.20.0/24 - App tier

10.30.0.0/16 - Development VPC
  10.30.0.0/20 - All resources (4,096 IPs)

Multi-Region Design

Region: NYC1
  10.10.0.0/16 - Production
  10.20.0.0/16 - Staging

Region: SFO2
  10.110.0.0/16 - Production (DR)

Region: AMS3
  10.210.0.0/16 - EU Production

Critical: Never overlap CIDR blocks between VPCs you might peer.

The Process

1. Inventory

vpc-list (existing VPCs)
droplet-list (what needs VPC access)

2. Design Questions

How many environments?
Which regions?
Need cross-region connectivity?
Compliance requirements (data residency)?
Expected growth?

3. Create VPCs

vpc-create:
  Name: vpc-<region>-<environment>
  Region: nyc1
  IPRange: 10.10.0.0/16
  Description: "Production VPC in NYC1"

4. VPC Peering (if needed)

vpc-peering-create:
  Name: peer-prod-nyc1-sfo2
  VpcIds: [<vpc1-id>, <vpc2-id>]

VPC Peering Patterns

Hub-and-Spoke

         [Shared Services VPC]
              /    |    \
             /     |     \
    [Prod VPC] [Staging] [Dev VPC]

Read the full file on GitHub · 197 lines

Changes

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.

11d ago First seen · 197 lines · 52 tokens per session scan A b9ac1dc5cfe9

Subscribe to this mod's changes

designing-vpcs is a skill published in the GitHub repository iamnolanhu/digitalocean-skills (4 stars, last pushed 7mo ago), licensed MIT. It adds 52 tokens to every session and 1,489 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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designing-vpcs