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 agentmods add skills/nexu-io/open-design/sample-pluginnpx skills add nexu-io/open-design --skill sample-plugingit clone --depth 1 https://github.com/nexu-io/open-designWhat 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 | $0.00022 | $0.00166 |
| Opus 5 | $0.00011 | $0.00083 |
| Sonnet 5 | $0.00004 | $0.00033 |
| Haiku 4.5 | $0.00002 | $0.00017 |
Grade A, and why
sample-plugin 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 yesterday.
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.
Copies of this mod
1 near-identical copy found in the catalogue:
- sample-plugin — 94% identical, 2 lines differ
What it actually says
Sample Plugin
This is the SKILL.md half of the Phase 1 e2e fixture. The companion
open-design.json sidecar carries the canonical OpenDesign plugin
manifest fields; this file proves the SKILL-only adapter path stays
honest when an install lacks an explicit sidecar (just delete
open-design.json to test the legacy compat tier).
Workflow
- Acknowledge the user's brief via the discovery question form atom.
- Use TodoWrite to plan the brief.
- Emit the brief as a deck artifact.
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.
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.
- yesterday First seen · 24 lines · 22 tokens per session scan A 32a0db454a1e
sample-plugin is a skill published in the GitHub repository nexu-io/open-design (92,778 stars, last pushed yesterday), licensed Apache-2.0. It adds 22 tokens to every session and 166 once invoked, about $0.0001 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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