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 skills add zjunlp/SkillNet --skill scienceworld-substance-coolergit 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-substance-cooler)<a href="https://agentmods.dev/skills/zjunlp/skillnet/scienceworld-substance-cooler"><img src="https://agentmods.dev/badge/skills/zjunlp/skillnet/scienceworld-substance-cooler.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector pass
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 5.1 | $0.00081 | $0.00554 |
| Opus 5 | $0.00041 | $0.00277 |
| Sonnet 5 | $0.00016 | $0.00111 |
| Haiku 4.5 | $0.00008 | $0.00055 |
Grade A, and why
scienceworld-substance-cooler 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 4d 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 — 33 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: Substance Cooler
Purpose
Use this skill to begin the process of cooling a substance to potentially observe a phase change (e.g., freezing). The core action is to relocate the substance into a cooling appliance.
When to Use
- The task explicitly requires cooling a substance (e.g., "measure the melting point of mercury").
- You have identified both the target substance (often inside a container like a cup or jar) and a suitable cooling appliance (e.g., freezer, ultra low temperature freezer).
- The immediate goal is to lower the substance's temperature.
Core Instruction
- Locate Items: Ensure you are in the room containing the target substance and the cooling appliance. Use
look aroundif necessary. - Execute Move: Perform the action
move <SUBSTANCE_CONTAINER> to <APPLIANCE>.<SUBSTANCE_CONTAINER>: The object holding the substance (e.g., "glass cup (containing a substance called mercury)").<APPLIANCE>: The cooling device (e.g., "freezer").
- Verify: Use
look at <APPLIANCE>to confirm the substance is now inside the appliance. Report this confirmation.
Important Notes
- Prerequisite: The appliance door must be open. The trajectory shows all containers are already open, so this should not require a separate
openaction. - This is an Initialization Skill: This skill only starts the cooling process. Subsequent skills or actions (like
use thermometer on <SUBSTANCE>) are required to monitor temperature changes and observe the phase transition. - Inputs: The skill requires the names of the substance container and the target appliance as identified in the environment observations.
- Output: A confirmation observation stating the substance is now inside the appliance.
Example from Trajectory
Trigger: Task requires measuring the melting point of mercury.
Action: move glass cup (containing a substance called mercury) to freezer
Verification: look at freezer yields "In the freezer is: a glass cup (containing a substance called mercury)."
Output: "The mercury in its glass cup has been placed into the freezer to begin cooling."
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.
- 4d ago First seen · 33 lines · 81 tokens per session scan A 8c76c4407e8c
scienceworld-substance-cooler is a skill published in the GitHub repository zjunlp/SkillNet (1,255 stars, last pushed today), licensed MIT. It adds 81 tokens to every session and 554 once invoked, about $0.0004 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 2026-09-03.
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