network-architect

A workflow for reviewing and designing security rules for Defined Networking overlay networks, which connect devices through a managed private network.

In plain words
What is it for?
It helps audit network settings, plan firewall rules, organize roles and tags, and apply network policy changes.
Why use it?
It helps reveal overly open rules, unused roles or tags, unassigned hosts, and other network-configuration gaps.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/quickvm/defined-mcp/network-architect
Any agent
npx skills add quickvm/defined-mcp --skill network-architect
Clone the repo
git clone --depth 1 https://github.com/quickvm/defined-mcp

Made for: Claude Code, Codex.

Per session 42 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,448 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00042 $0.01448
Opus 5 $0.00021 $0.00724
Sonnet 5 $0.00008 $0.00290
Haiku 4.5 $0.00004 $0.00145

Measured 2d ago against content hash 759f646a51f5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

network-architect 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 2d 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.

.claude/skills/network-architect/SKILL.md · 132 lines

How it starts

The opening of the file, as written. The whole thing — 132 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a Defined Networking overlay network architect. You help users audit, design, and implement firewall policies for their Managed Nebula networks using the defined_mcp MCP tools.

Mode: $0

Run the mode specified by the first argument. If no argument is given, ask the user which mode they want.


audit

Perform a security and configuration audit of the user's Defined Networking account.

Steps

  1. Gather state — call these in parallel:

    • list_networks
    • list_roles
    • list_tags
    • list_hosts (paginate through all pages)
  2. Analyze and report each of these categories:

    Roles

    • Roles with zero firewall rules (wide open to nothing — probably needs rules or is unused)
    • Roles with overly permissive rules (protocol=ANY, no portRange, no allowedRoleID, no allowedTags)
    • Roles assigned to zero hosts (dead roles)

    Tags

    • Tags with zero hosts assigned (dead tags — may be stale)
    • Tags with config overrides (list them — the user may not remember what they set)
    • Tags used in firewall rules vs tags only used for config (different purposes)

    Hosts

    • Hosts with no role assigned
    • Hosts with no tags
    • Hosts that haven't been seen recently (stale/offline — check metadata.lastSeenAt)
    • Hosts with outdated dnclient versions (check metadata.updateAvailable)
    • Lighthouses and relays — verify they have static addresses and non-zero listen ports

    Firewall coverage

    • For each role, summarize what inbound traffic is allowed and from whom
    • Identify roles that allow traffic from ANY role (no allowedRoleID restriction)
    • Identify rules that allow ALL ports (no portRange)
  3. Output format — present as a structured report with sections. Use tables where appropriate. Flag issues by severity:

    • Warning: Likely misconfiguration (empty roles, permissive rules)
    • Info: Worth reviewing (unused tags, stale hosts)
    • OK: Passing checks

design

Interactive network policy design session. Help the user plan their role and tag structure, then generate the firewall rules.

Read the full file on GitHub · 132 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.

  1. 2d ago First seen · 132 lines · 42 tokens per session scan A 759f646a51f5

Subscribe to this mod's changes

network-architect is a skill published in the GitHub repository quickvm/defined-mcp (4 stars, last pushed 4mo ago), licensed MIT. It adds 42 tokens to every session and 1,448 once invoked, about $0.0002 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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