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-tool-validatornpx skills add zjunlp/SkillNet --skill scienceworld-tool-validatorgit 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-tool-validator)<a href="https://agentmods.dev/skills/zjunlp/skillnet/scienceworld-tool-validator"><img src="https://agentmods.dev/badge/skills/zjunlp/skillnet/scienceworld-tool-validator.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 5.1 | $0.00074 | $0.00539 |
| Opus 5 | $0.00037 | $0.00269 |
| Sonnet 5 | $0.00015 | $0.00108 |
| Haiku 4.5 | $0.00007 | $0.00054 |
Grade A, and why
scienceworld-tool-validator 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.
How it starts
The opening of the file, as written. The whole thing — 63 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: scienceworld-tool-validator
Purpose
Perform a pre-use functionality check on a tool or instrument to confirm it is operational before employing it in a critical ScienceWorld task step such as measurement, activation, or connection.
When to Use
- Immediately after acquiring a tool (e.g.,
pick up thermometer) and before its first use - When switching to a different tool mid-task and needing to confirm readiness
- When resuming a task after navigation and needing to re-confirm tool availability
Workflow
- Acquire the tool -- Ensure the target tool is in inventory. If not, locate it with
look aroundand retrieve it withpick up [TOOL]. - Execute validation -- Run:
focus on [TOOL] in inventory. - Confirm readiness -- A successful response (
"You focus on the [TOOL].") confirms the tool is operational. No further diagnostic steps are needed unless an error is observed. - Proceed -- Use the validated tool in the task operation (e.g.,
use thermometer on [TARGET]).
Examples
Example 1: Validating a thermometer before measurement
> pick up thermometer
You pick up the thermometer.
> focus on thermometer in inventory
You focus on the thermometer.
The thermometer is validated. Proceed with measurement:
> use thermometer on unknown substance B
The thermometer measures a temperature of 42 degrees celsius.
Example 2: Validating a scale after teleporting to a new room
> teleport to workshop
You teleport to the workshop.
> pick up scale
You pick up the scale.
> focus on scale in inventory
You focus on the scale.
The scale is validated and ready to weigh objects.
Key Principles
- Timing -- Validate immediately after acquisition, before any task-sensitive operation.
- Simplicity -- The
focus onaction is the primary, lightweight validation method. Avoid unnecessaryexamineoruseactions during the check. - State awareness -- Ensure containers are open and items are accessible before attempting to pick up tools. Use
teleport tofor efficient navigation.
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.
- 2d ago First seen · 63 lines · 74 tokens per session scan A 4ce596140b4d
scienceworld-tool-validator is a skill published in the GitHub repository zjunlp/SkillNet (1,253 stars, last pushed yesterday), licensed MIT. It adds 74 tokens to every session and 539 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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