sddf-net

sddf-net is a skill for Claude Code, Codex from jordanhubbard/agentos. It costs 0 tokens per session (197 once invoked), scanned A, original, BSD-2-Clause.

A guide to network input and output in agentOS using shared data queues between protected components. A network driver controls the network card, while other components exchange buffer references through those queues.

In plain words
What is it for?
Use it when designing NIC drivers, network multiplexing, virtual-machine network backends, and shared queue layouts.
Why use it?
It prevents guests or client components from directly owning hardware, sending full packets through control messages, or using unsafe pointers across protection boundaries.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it when designing NIC drivers, network multiplexing, virtual-machine network backends, and shared queue layouts.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/jordanhubbard/agentos/sddf-net
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 jordanhubbard/agentos --skill sddf-net
Clone the repo
git clone --depth 1 https://github.com/jordanhubbard/agentos

Made for: Claude Code, Codex.

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 sddf-net

README.md
[![agentmods](https://agentmods.dev/badge/skills/jordanhubbard/agentos/sddf-net/github.svg)](https://agentmods.dev/skills/jordanhubbard/agentos/sddf-net)
Your own site
<a href="https://agentmods.dev/skills/jordanhubbard/agentos/sddf-net"><img src="https://agentmods.dev/badge/skills/jordanhubbard/agentos/sddf-net/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 sddf-net

Your own site · 80×15
<a href="https://agentmods.dev/skills/jordanhubbard/agentos/sddf-net"><img src="https://agentmods.dev/badge/skills/jordanhubbard/agentos/sddf-net.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 197 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00000 $0.00197
Opus 5 $0.00000 $0.00098
Sonnet 5 $0.00000 $0.00039
Haiku 4.5 $0.00000 $0.00020

Measured 5d ago against content hash a441a8d67d2f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

sddf-net 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 5d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/queue_layout.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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/sddf-net/SKILL.md · 24 lines

What it actually says

sDDF net

Network I/O in agentOS is sDDF-shaped: driver owns the NIC (or QEMU virtio-net as a stand-in), net_virt muxes, clients hold queue caps.

Invariants

  • NIC MMIO/IRQ belong to the driver PD only.
  • Clients (VMM virtio backends, native stacks) use free/active queue pairs.
  • Buffers are offsets into a data region, not raw pointers across PDs.
  • Guests do not DMA to the host NIC. The VMM emulates virtio-net.

Forbidden

  • MSG_NET_SEND of a full frame through IPC registers as the data path.
  • Mapping QEMU virtio-net MMIO into a guest.
  • Per-guest NICs that split QEMU buses instead of sharing net_virt.

Helper

python3 skills/sddf-net/scripts/queue_layout.py
Files

What ships with it

1 file 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. 5d ago First seen · 24 lines · 0 tokens per session scan A a441a8d67d2f

Subscribe to this mod's changes

sddf-net is a skill published in the GitHub repository jordanhubbard/agentos (29 stars, last pushed today), licensed BSD-2-Clause. It costs nothing until one of its globs matches a file; then it loads 197 tokens. 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 2026-09-04.

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