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sg-gov-network-security

sg-gov-network-security is a skill for Claude Code from kyleoliveiro/sg-gov-skills. It costs 230 tokens per session (2,818 once invoked), scanned A, original, MIT.

A guide to securing the network boundaries of a Singapore government system. It covers network segmentation, private connections, traffic filtering, access restrictions, security groups, and detection of network changes or intrusions.

In plain words
What is it for?
Use it to design or audit cloud network layouts, subnets, firewall and security-group rules, private service connections, egress controls, and network monitoring.
Why use it?
It helps prevent unintended access between system components and stops trusted traffic from taking insecure paths over the public internet. It also promotes deny-by-default network rules.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the cybersecurity plugin — 10 skills shipped together

not rated 17repo 7d ago A scan 230 tokens original MIT

Good fit Use it to design or audit cloud network layouts, subnets, firewall and security-group rules, private service connections, egress controls, and network monitoring.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/kyleoliveiro/sg-gov-skills/sg-gov-network-security
View source ↗ kyleoliveiro/sg-gov-skills
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 kyleoliveiro/sg-gov-skills --skill sg-gov-network-security
Clone the repo
git clone --depth 1 https://github.com/kyleoliveiro/sg-gov-skills

Made for: Claude Code.

Or install cybersecurity, the plugin that ships this one along with the rest of its 10 skills.

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.

agentmods badge for sg-gov-network-security

README.md
[![agentmods](https://agentmods.dev/badge/skills/kyleoliveiro/sg-gov-skills/sg-gov-network-security/github.svg)](https://agentmods.dev/skills/kyleoliveiro/sg-gov-skills/sg-gov-network-security)
Your own site
<a href="https://agentmods.dev/skills/kyleoliveiro/sg-gov-skills/sg-gov-network-security"><img src="https://agentmods.dev/badge/skills/kyleoliveiro/sg-gov-skills/sg-gov-network-security/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.

agentmods 80×15 button for sg-gov-network-security

Your own site · 80×15
<a href="https://agentmods.dev/skills/kyleoliveiro/sg-gov-skills/sg-gov-network-security"><img src="https://agentmods.dev/badge/skills/kyleoliveiro/sg-gov-skills/sg-gov-network-security.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 230 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,818 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00230 $0.02818
Opus 5.5 $0.00092 $0.01127
Sonnet 5.5 $0.00046 $0.00564
Haiku 4.5 $0.00023 $0.00282

Measured 7d ago against content hash d9ceae1012a3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sg-gov-network-security 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 7d 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.

skills/sg-gov-network-security/SKILL.md · 191 lines

How it starts

The opening of the file, as written. The whole thing — 191 lines — stays where its author put it; the contents beside it link to each section on GitHub.

sg-gov-network-security: NS controls for SG government systems

You are designing or auditing the network boundaries of a Singapore government system against the ICT&SS Policy Reform Network Security family (NS-1..NS-11). The family's scope is securing the network boundaries of a system: how the network is segmented, what may talk to what, how the edge is filtered, how services and sites connect privately, and how changes and intrusions are detected. Almost all of it is cloud/IaC configuration (security groups, endpoints, certificates, alert rules), and a VAPT or CSPM scan checks it.

Two principles run through the family:

  1. Deny by default applies across the family, not just in NS-3. NS-3 states it, but NS-1 segmentation, NS-2 resource policies, NS-9 private connectivity, and CS-9's private cluster API apply the same idea at different interfaces. If an audit finds one 0.0.0.0/0 rule, check where else the default was left open, including egress, which teams often miss.
  2. Traffic between trusted parts never crosses the internet. Private-to-private (NS-4), service-to-service (NS-7), and cloud-to-on-prem (NS-8) traffic all must move over private, authenticated, encrypted paths. "It's HTTPS anyway" does not satisfy the private-routing half.

Source and currency

Control text in this skill and references/ns-controls.md is embedded from info.standards.tech.gov.sg as of 2026-07-23 (NS family page last updated 5 March 2026). The standards iterate actively. For any compliance-critical decision, verify against the live page:

Reference files

  • references/ns-controls.md — full text of NS-1..NS-11 (statement, recommendations, risk statement) plus cross-family notes. Read it when you need exact wording for an audit response or SSP documentation.
  • references/implementation-recipes.md — concrete config per control: subnet tiering, resource policies, deny-by-default rules, PrivateLink/peering/TGW choices, WAF/CDN setup, certificate automation, mTLS options, hybrid connectivity, IPS/IDS, remote access hardening, and firewall-change alert wiring, with AWS/Azure/GCP specifics. Read it when building or fixing.

Read the full file on GitHub · 191 lines

Files

What ships with it

6 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.

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.

  1. 7d ago First seen · 191 lines · 230 tokens per session scan A d9ceae1012a3

Subscribe to this mod's changes

sg-gov-network-security is a skill published in the GitHub repository kyleoliveiro/sg-gov-skills (17 stars, last pushed 7d ago), licensed MIT. It adds 230 tokens to every session and 2,818 once invoked, about $0.0009 per session on Opus 5.5. 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 2026-11-03.

CloudDevOps and cloudSecurity
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sg-gov-network-security next to 6 skills from other repositories
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