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 skills add oborchers/fractional-cto --skill network-architecturegit clone --depth 1 https://github.com/oborchers/fractional-ctoWrote 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.
[](https://agentmods.dev/skills/oborchers/fractional-cto/network-architecture)<a href="https://agentmods.dev/skills/oborchers/fractional-cto/network-architecture"><img src="https://agentmods.dev/badge/skills/oborchers/fractional-cto/network-architecture/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.
<a href="https://agentmods.dev/skills/oborchers/fractional-cto/network-architecture"><img src="https://agentmods.dev/badge/skills/oborchers/fractional-cto/network-architecture.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00079 | $0.03594 |
| Opus 5 | $0.00039 | $0.01797 |
| Sonnet 5 | $0.00016 | $0.00719 |
| Haiku 4.5 | $0.00008 | $0.00359 |
Grade A, and why
network-architecture 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 10d 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 — 320 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Design the Network Before the First Compute Resource
Your network is the one thing you cannot change without rebuilding everything on top of it. CIDR ranges, subnet tiers, and availability zone layout are decisions that harden like concrete within days of deploying your first service. A poorly planned network forces painful migrations when you need VPC peering, run out of IP addresses, or discover that your database is in the same subnet as your public load balancer.
Design the network first. Get the CIDR planning, subnet tiers, DNS zones, and private connectivity endpoints right on day one. Everything else -- compute, databases, monitoring -- builds on this foundation.
Subnet Tiers
Every VPC needs at least three subnet tiers as a baseline. Each tier has its own route table and security posture. Each tier spans multiple availability zones for resilience.
Baseline: Three Tiers (Every Project)
VPC (10.0.0.0/16)
│
├── Public Subnets (/24 x 3 AZs)
│ Purpose: Internet-facing resources only
│ Contains: NAT gateways, load balancers
│ Route: 0.0.0.0/0 -> Internet Gateway
│
├── Private Subnets (/24 x 3 AZs)
│ Purpose: Application workloads
│ Contains: Containers, compute instances, application services
│ Route: 0.0.0.0/0 -> NAT Gateway (outbound only)
│
└── Database Subnets (/24 x 3 AZs)
Purpose: Managed database engines
Contains: PostgreSQL, MySQL instances
Route: No internet access (VPC CIDR only)
Additional Tiers (Add When Needed)
Add dedicated subnet tiers when your architecture requires them. Common additions:
| Tier | Add When | Purpose |
|---|---|---|
| Cache | You run managed in-memory stores (Redis, Memcached) | Isolate cache traffic from database traffic; dedicated subnet groups |
| Warehouse | You run analytical databases (data warehouses, columnar stores) | Separate analytical workloads from operational databases |
| Messaging | You run managed message brokers | Isolate broker traffic with dedicated routing |
What ships with it
2 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.
- 10d ago First seen · 320 lines · 79 tokens per session scan A 750a654294df
network-architecture is a skill published in the GitHub repository oborchers/fractional-cto (29 stars, last pushed 1mo ago), licensed MIT. It adds 79 tokens to every session and 3,594 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.
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