SkillNet is infrastructure for finding, creating, evaluating, combining, and coordinating reusable capabilities for AI agents. Agent developers use it as a searchable and installable library of skills and as a system for selecting skills for particular tasks. The catalogue contains skills that can be discovered, installed, or used with SkillNet.
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/zjunlp/skillnet/scienceworld-circuit-buildernpx skills add zjunlp/SkillNet --skill scienceworld-circuit-buildergit clone --depth 1 https://github.com/zjunlp/SkillNetWrote 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/zjunlp/skillnet/scienceworld-circuit-builder)<a href="https://agentmods.dev/skills/zjunlp/skillnet/scienceworld-circuit-builder"><img src="https://agentmods.dev/badge/skills/zjunlp/skillnet/scienceworld-circuit-builder.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00064 | $0.00863 |
| Opus 5 | $0.00032 | $0.00432 |
| Sonnet 5 | $0.00013 | $0.00173 |
| Haiku 4.5 | $0.00006 | $0.00086 |
Grade A, and why
scienceworld-circuit-builder 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.
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 — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Instructions
1. Objective
Your goal is to build a functional electrical circuit to test the conductivity of a target object (e.g., a metal pot). The circuit's success is indicated by a light bulb turning on.
2. Prerequisites & Setup
- Location: You must be in the workshop. If not, teleport there.
- Components: Ensure the following are present on the table:
- A battery
- A light bulb (e.g., blue light bulb)
- At least two wires (e.g., orange, yellow, green)
- The target object to test (e.g., metal pot)
- A blue box (for conductive objects) and an orange box (for non-conductive objects)
- Inventory: The target object must be in your inventory. If not, locate and pick it up.
3. Core Procedure
Follow these steps to construct the series circuit. Use the exact connect actions as shown.
- Place the Target Object: Drop the target object from your inventory onto the floor of the workshop.
- Connect Power Source:
connect battery anode to <Wire1> terminal 1(e.g.,orange wire)connect battery cathode to <Wire2> terminal 1(e.g.,yellow wire)
- Connect Light Bulb:
connect <Wire1> terminal 2 to <LightBulb> cathode(e.g.,blue light bulb)connect <Wire3> terminal 2 to anode in <LightBulb>(e.g.,green wire)
- Integrate Target Object into Circuit:
connect <TargetObject> terminal 1 to <Wire2> terminal 2connect <TargetObject> terminal 2 to <Wire3> terminal 1
4. Testing & Conclusion
- Observe: After completing the connections,
wait1for 1-2 iterations. - Check Result:
look around. If the light bulb is on, the target object is electrically conductive. - Final Action: Based on the result:
- If conductive:
move <TargetObject> to blue box - If non-conductive:
move <TargetObject> to orange box
- If conductive:
5. Key Principles
- Circuit Logic: This builds a simple series circuit: Battery -> Wire1 -> Light Bulb -> Wire3 -> Target Object -> Wire2 -> Battery.
- Action Precision: Use the exact object names and connection points (anode, cathode, terminal 1/2) as observed in the environment.
- Error Handling: If a component is missing, examine the room (
look around) to identify available substitutes before proceeding.
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.
- 5d ago First seen · 58 lines · 64 tokens per session scan A 4aa49ce835d8
scienceworld-circuit-builder is a skill published in the GitHub repository zjunlp/SkillNet (1,253 stars, last pushed today), licensed MIT. It adds 64 tokens to every session and 863 once invoked, about $0.0003 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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