What is aws-networking-and-edge?

A guide for designing and reviewing AWS networks and internet-facing services, including VPCs, subnets, routing, firewalls, load balancers, DNS, and edge protection. A VPC is an isolated network inside AWS.

Use it when creating a VPC, exposing a service, connecting accounts or networks, tuning edge traffic, or investigating NAT, routing, security-group, and cross-zone cost issues.

It helps prevent unclear network boundaries, accidental exposure, connectivity failures, and unnecessary data-transfer costs. It also provides defaults for separating public, private, and internal-only resources.

aws-networking-and-edge — Skill for Claude Code by jsgerman-oss

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 jsgerman-oss/blackrim-nimbus-skills --skill aws-networking-and-edge

Clone the repo

git clone --depth 1 https://github.com/jsgerman-oss/blackrim-nimbus-skills

Made for: Claude Code.

Or install cloud-aws, the plugin that ships this one along with the rest of its 6 skills, 1 command, 2 agents.

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/jsgerman-oss/blackrim-nimbus-skills/aws-networking-and-edge/github.svg)](https://agentmods.dev/skills/jsgerman-oss/blackrim-nimbus-skills/aws-networking-and-edge)

Your own site

<a href="https://agentmods.dev/skills/jsgerman-oss/blackrim-nimbus-skills/aws-networking-and-edge"><img src="https://agentmods.dev/badge/skills/jsgerman-oss/blackrim-nimbus-skills/aws-networking-and-edge/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/jsgerman-oss/blackrim-nimbus-skills/aws-networking-and-edge"><img src="https://agentmods.dev/badge/skills/jsgerman-oss/blackrim-nimbus-skills/aws-networking-and-edge.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 73 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,000 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. 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	$0.00073	$0.02000
Opus 5	$0.00036	$0.01000
Sonnet 5	$0.00015	$0.00400
Haiku 4.5	$0.00007	$0.00200

Measured 12d ago against content hash 62ffafd1e59b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

aws-networking-and-edge 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 12d 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.

cloud-aws/skills/aws-networking-and-edge/SKILL.md · 140 lines

How it starts

The opening of the file, as written. The whole thing — 140 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AWS Networking and Edge

When to use

Designing a new VPC for an account or workload.
Exposing an internal service to the internet (or another VPC / account).
Tuning latency, TLS, or WAF posture at the edge.
Auditing east-west connectivity (peering, TGW, PrivateLink, VPN).
Tracking down NAT / cross-AZ data costs.

VPC layout — the boring default

One VPC per environment (dev / stage / prod). Multi-account if you have any compliance pressure — accounts are the cheapest blast-radius boundary AWS gives you.
CIDR: /16 per VPC. /19 or /20 per subnet — leave room.
Subnets per AZ, across at least 3 AZs in the region:
- public (IGW route) — only for load balancers and NAT.
- private (NAT route) — application workloads.
- isolated (no NAT) — databases, internal-only.
IPv6 dual-stack if you have any large-scale or egress-cost-sensitive workload — public-IPv4 charges starting 2024 make this matter.
VPC Flow Logs to S3 (cheaper) or CloudWatch — at least REJECT for security baseline, ALL for forensics-ready accounts.

Subnet, SG, NACL discipline

Security Groups: stateful, the primary control. Reference SGs from SGs (sg-app-tier can reach sg-db-tier:5432), never raw CIDR for intra-VPC traffic.
NACLs: stateless, leave at default-allow unless you have a real reason. They're hard to debug and rarely catch what SGs miss.
No 0.0.0.0/0 on a database SG. Ever.
No 0.0.0.0/0 inbound on port 22 / 3389. Use SSM Session Manager.

NAT and egress

One NAT Gateway per AZ for HA; cross-AZ NAT is a silent uptime + cost trap.
For high-volume egress to AWS services, use VPC endpoints (Gateway for S3 / DynamoDB; Interface PrivateLink for nearly everything else) — bypasses NAT, often cheaper, stays on the AWS backbone.
For controlled egress to the internet, AWS Network Firewall or a Transit Gateway with centralized egress is the grown-up answer.

Load balancing

Use case	Pick
HTTPS service, host- / path-based routing	Application Load Balancer (ALB)
TLS passthrough, UDP, static IP needed, extreme TPS	Network Load Balancer (NLB)
Cross-region, latency-sensitive global	Global Accelerator in front of ALB / NLB
Internal service-to-service	Internal ALB / NLB or App Mesh / Service Connect

Read the full file on GitHub · 140 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.

12d ago First seen · 140 lines · 73 tokens per session scan A 62ffafd1e59b

Subscribe to this mod's changes

aws-networking-and-edge is a skill published in the GitHub repository jsgerman-oss/blackrim-nimbus-skills (8 stars, last pushed 26d ago), licensed MIT. It adds 73 tokens to every session and 2,000 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 2026-08-31.

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