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Agent skill

Scienceworld Substance Fetcher

by zjunlp in zjunlp/SkillNet

Locates and retrieves a target substance or material from a container in the environment.

MITAuto-check passed

Install Scienceworld Substance Fetcher

skills CLI
$ npx skills add zjunlp/SkillNet --skill scienceworld-substance-fetcher -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install zjunlp/SkillNet scienceworld-substance-fetcher --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/zjunlp/SkillNet.git skills-src && mkdir -p .claude/skills && cp -r skills-src/experiments/src/skills/scienceworld/scienceworld-substance-fetcher .claude/skills/scienceworld-substance-fetcher && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
scienceworld-substance-fetcher
GitHub stars
1.4k
Token cost
~690 tokens
SKILL.md length
326 words
Files
2 (incl. references)
Skills in repo
122
Repo updated
First seen
Licence
MIT

At a glance

Locates and retrieves a target substance or material from a container in the environment.

  • Works in 4 steps: Identify Target: The target substance… → Search Strategy → Locate in Container → …
  • The task requires processing a specific substance (e.g.
  • SKILL.md covers Primary Objective, Core Logic & Workflow, Critical Constraints & Notes and Example Execution (Based on…, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Scienceworld Substance Fetcher is an agent skill from zjunlp/SkillNet. Locates and retrieves a target substance or material from a container in the environment. Use this skill when the task requires processing a specific substance (e.g., chocolate, sodium chloride, a chemical) and you need to find and acquire it. Searches rooms and containers (fridge, cupboard, counter) and retrieves the substance via pick up or move actions.

Its SKILL.md is about 690 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/action_primer.md`).

The repository describes itself as: Create, Evaluate, and Connect AI Skills. The licence is MIT.

When your agent uses it

  • The task requires processing a specific substance (e.g.
  • Sodium chloride
  • A chemical) and you need to find and acquire it

Example prompts

  • “Use the scienceworld-substance-fetcher skill to locate and retrieves a target substance or material from a container in the environment”
  • “/scienceworld-substance-fetcher”

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Identify Target: The target substance name is provided as part of the task initiation (e.g., "Your task is to measure the melting point of…
  2. Search Strategy
  3. Locate in Container
  4. Retrieval Action

What it can do on your machine

Read from SKILL.md and the folder at commit c527136. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Scienceworld Substance Fetcher loads about 690 tokens when it runs, and up to ~915 if it reads all its reference files. Until then it costs about 97 tokens; SKILL.md has 326 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~97
When it runs · the whole SKILL.md, loaded when a task matches
~690
With references · SKILL.md plus every file in references/, read only if the agent opens them
~915

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from zjunlp/SkillNet at commit c527136, republished under its MIT licence (© zjunlp). 326 words, ~690 tokens.

Download SKILL.mdSave it as .claude/skills/scienceworld-substance-fetcher/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
scienceworld-substance-fetcher
description
Locates and retrieves a target substance or material from a container in the environment. Use this skill when the task requires processing a specific substance (e.g., chocolate, sodium chloride, a chemical) and you need to find and acquire it. Searches rooms and containers (fridge, cupboard, counter) and retrieves the substance via pick up or move actions.

Skill: Substance Fetcher

Primary Objective

Locate a specified target substance (e.g., chocolate, sodium chloride) within the environment and retrieve it for subsequent processing.

Core Logic & Workflow

  1. Identify Target: The target substance name is provided as part of the task initiation (e.g., "Your task is to measure the melting point of chocolate").
  2. Search Strategy:
    • If the current room does not contain the target, use teleport to [room] to navigate to likely locations (e.g., kitchen, workshop, greenhouse).
    • Use look around to survey a room and identify containers.
  3. Locate in Container:
    • Examine open containers (fridge, cupboard, counter, drawer) listed in the room description.
    • The target substance is often found inside a container (e.g., "In the fridge is: chocolate").
  4. Retrieval Action:
    • If the substance is a portable object, use pick up [substance].
    • If the substance is inside another object (e.g., in a pot), use move [substance] to [destination container] to prepare it for use.
    • Key Assumption: All containers are already open. Do not use open or close actions.

Critical Constraints & Notes

  • Container State: Assume all containers (fridge, cupboard, drawer) are already open. Do not waste actions opening them.
  • Action Efficiency: Prefer pick up for direct acquisition. Use move only when necessary to transfer the substance to a specific vessel for an experiment.
  • Verification: After retrieval, you may use examine [substance] or check your inventory to confirm success before proceeding to the next phase of the experiment.

Example Execution (Based on Trajectory)

Task Context: "Your task is to measure the melting point of chocolate..."

  1. teleport to kitchen
  2. look around (Observes: "In the fridge is: chocolate...")
  3. pick up chocolate or move chocolate to metal pot

Error Handling

  • If the substance is not found in the initially suspected room, teleport to and search other relevant rooms (e.g., workshop for chemicals, greenhouse for plants).
  • If the retrieval action fails (e.g., object not found), re-examine the room description with look around to confirm the substance's location and container.

© zjunlp, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in experiments/src/skills/scienceworld/scienceworld-substance-fetcher of zjunlp/SkillNet.

  • SKILL.md
  • references/action_primer.md

Open the folder on GitHubat commit c527136

Compare with similar skills

Scienceworld Substance Fetcher next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Scienceworld Substance Fetcher compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Scienceworld Substance Fetcher this skillzjunlp/SkillNet1.4k—~690Automated safety check: PassMIT
Iterative Retrievalaffaan-m/ECC277k7 repos~1.6kAutomated safety check: PassMIT
Apple Containersickn33/agentic-awesome-skills47k1 repos~2.5kAutomated safety check: PassApache-2.0
Container Security Hardeningsickn33/agentic-awesome-skills47k1 repos~1kAutomated safety check: NotesMIT
Container Queriesthedaviddias/Front-End-Checklist74k—~526Automated safety check: PassMIT
CSS Containmentthedaviddias/Front-End-Checklist74k—~512Automated safety check: PassMIT

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Questions about Scienceworld Substance Fetcher

What does Scienceworld Substance Fetcher do?

Locates and retrieves a target substance or material from a container in the environment. Scienceworld Substance Fetcher is an agent skill from zjunlp/SkillNet. Locates and retrieves a target substance or material from a container in the environment.

When should I use Scienceworld Substance Fetcher?

Scienceworld Substance Fetcher fits situations like: the task requires processing a specific substance (e.g; sodium chloride; A chemical) and you need to find and acquire it.

How do I install Scienceworld Substance Fetcher in Claude Code?

Run `npx skills add zjunlp/SkillNet --skill scienceworld-substance-fetcher -a claude-code`. Or copy the skill folder (experiments/src/skills/scienceworld/scienceworld-substance-fetcher in zjunlp/SkillNet) into .claude/skills/scienceworld-substance-fetcher in your project. Claude Code loads it when a task matches its description.

How do I install Scienceworld Substance Fetcher in Codex?

Run `npx skills add zjunlp/SkillNet --skill scienceworld-substance-fetcher -a codex`. Or copy the skill folder (experiments/src/skills/scienceworld/scienceworld-substance-fetcher in zjunlp/SkillNet) into .agents/skills/scienceworld-substance-fetcher in your project. Codex loads it when a task matches its description.

Can I use Scienceworld Substance Fetcher in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add zjunlp/SkillNet --skill scienceworld-substance-fetcher -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/scienceworld-substance-fetcher, .gemini/skills/scienceworld-substance-fetcher, .github/skills/scienceworld-substance-fetcher and .opencode/skills/scienceworld-substance-fetcher in your project.

What does Scienceworld Substance Fetcher need to run?

SKILL.md names no scripts, command-line tools or credentials: Scienceworld Substance Fetcher is instructions for the agent only.

Does Scienceworld Substance Fetcher access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Scienceworld Substance Fetcher safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Scienceworld Substance Fetcher use?

Scienceworld Substance Fetcher is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Scienceworld Substance Fetcher use?

About 690 tokens (SKILL.md is roughly 2.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 225 tokens, read only when the agent opens those files.

What are the alternatives to Scienceworld Substance Fetcher?

Skills that share tags, products or a category with Scienceworld Substance Fetcher: Iterative Retrieval (affaan-m/ECC, 277k stars), Apple Container (sickn33/agentic-awesome-skills, 47k stars), Container Security Hardening (sickn33/agentic-awesome-skills, 47k stars) and Container Queries (thedaviddias/Front-End-Checklist, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Scienceworld Substance Fetcher?

zjunlp (a GitHub organization) maintains it in zjunlp/SkillNet, which has 1,397 GitHub stars. The repository holds 122 skills in this directory. The repository was last updated on October 9, 2026.

Source: zjunlp/SkillNet on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.