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Agent skill

Chemical Mass Percent Calculation

by InternScience in InternScience/scp

Calculate mass percentages and stoichiometric ratios for chemical reactions and compound compositions.

MITAuto-check passed

Install Chemical Mass Percent Calculation

skills CLI
$ npx skills add InternScience/scp --skill chemical-mass-percent-calculation -a claude-code

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

GitHub CLI
$ gh skill install InternScience/scp chemical-mass-percent-calculation --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/InternScience/scp.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/chemical-mass-percent-calculation .claude/skills/chemical-mass-percent-calculation && 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
chemical-mass-percent-calculation
GitHub stars
170
Used in
1 other repo
Token cost
~521 tokens
SKILL.md length
15 words
Files
1
Skills in repo
73
Repo updated
First seen
Licence
MIT

At a glance

Calculate mass percentages and stoichiometric ratios for chemical reactions and compound compositions.

  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Chemical Mass Percent Calculation is an agent skill from InternScience/scp. Calculate mass percentages and stoichiometric ratios for chemical reactions and compound compositions.

Its SKILL.md is about 520 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The licence is MIT.

Example prompts

  • “/chemical-mass-percent-calculation”

Requirements

  • Python 3

What it can do on your machine

Read from SKILL.md and the folder at commit cea5398. 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 (its code samples are python).

    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

Chemical Mass Percent Calculation loads about 521 tokens when it runs. Until then it costs about 34 tokens; SKILL.md has 15 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~34
When it runs · the whole SKILL.md, loaded when a task matches
~521

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 InternScience/scp at commit cea5398, republished under its MIT licence (© InternScience). 15 words, ~521 tokens.

Download SKILL.mdSave it as .claude/skills/chemical-mass-percent-calculation/SKILL.md (or your agent's skills folder).
name
chemical-mass-percent-calculation
description
Calculate mass percentages and stoichiometric ratios for chemical reactions and compound compositions.
license
MIT license
metadata.skill-author
PJLab

Chemical Mass Percent Calculation

Usage

python
import asyncio
import json
from mcp.client.streamable_http import streamablehttp_client
from mcp import ClientSession

class ChemistryClient:
    def __init__(self, server_url: str, api_key: str):
        self.server_url = server_url
        self.api_key = api_key
        self.session = None

    async def connect(self):
        try:
            self.transport = streamablehttp_client(url=self.server_url, headers={"SCP-HUB-API-KEY": self.api_key})
            self.read, self.write, self.get_session_id = await self.transport.__aenter__()
            self.session_ctx = ClientSession(self.read, self.write)
            self.session = await self.session_ctx.__aenter__()
            await self.session.initialize()
            return True
        except:
            return False

    async def disconnect(self):
        if self.session:
            await self.session_ctx.__aexit__(None, None, None)
        if hasattr(self, 'transport'):
            await self.transport.__aexit__(None, None, None)

    def parse_result(self, result):
        try:
            if hasattr(result, 'content') and result.content:
                return json.loads(result.content[0].text)
            return str(result)
        except:
            return {"error": "parse error"}

## Initialize and use
client = ChemistryClient("https://scp.intern-ai.org.cn/api/v1/mcp/24/Chemistry_and_Reaction_Calculations", "<your-api-key>")
await client.connect()

# Calculate mass percent of oxygen in H2O
mass_H = 2 * 1.008  # 2 hydrogen atoms
mass_O = 1 * 16.00  # 1 oxygen atom
total_mass = mass_H + mass_O
percent_O = (mass_O / total_mass) * 100
print(f"Mass percent of O in H2O: {percent_O:.2f}%")

await client.disconnect()
Use Cases
  • Stoichiometry, analytical chemistry, quality control, reaction yield calculations

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

Files

Just SKILL.md in skills/chemical-mass-percent-calculation of InternScience/scp.

Open the folder on GitHubat commit cea5398

Used in 2 other repositories

We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in InternScience/scp, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Chemical Mass Percent Calculation 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.

Chemical Mass Percent Calculation compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Chemical Mass Percent Calculation this skillInternScience/scp1701 repos~521Automated safety check: PassMIT
Tooluniverse Chemical Compound Retrievalwu-yc/LabClaw1.1k2 repos~2.3kAutomated safety check: PassNone
Chemical Compound Retrievallamm-mit/scienceclaw246—~2.4kAutomated safety check: PassApache-2.0
Compute Mamba Ratiosgl-project/sglang37k2 repos~2.9kAutomated safety check: PassApache-2.0
Mass-ULW Workflow Runscode-yeongyu/oh-my-openagent70k—~2.5kAutomated safety check: PassCustom licence
Compound Learning WriterEveryInc/compound-engineering-plugin25k—~2kAutomated safety check: PassMIT

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Questions about Chemical Mass Percent Calculation

What does Chemical Mass Percent Calculation do?

Calculate mass percentages and stoichiometric ratios for chemical reactions and compound compositions. Chemical Mass Percent Calculation is an agent skill from InternScience/scp. Calculate mass percentages and stoichiometric ratios for chemical reactions and compound compositions.

How do I install Chemical Mass Percent Calculation in Claude Code?

Run `npx skills add InternScience/scp --skill chemical-mass-percent-calculation -a claude-code`. Or copy the skill folder (skills/chemical-mass-percent-calculation in InternScience/scp) into .claude/skills/chemical-mass-percent-calculation in your project. Claude Code loads it when a task matches its description.

How do I install Chemical Mass Percent Calculation in Codex?

Run `npx skills add InternScience/scp --skill chemical-mass-percent-calculation -a codex`. Or copy the skill folder (skills/chemical-mass-percent-calculation in InternScience/scp) into .agents/skills/chemical-mass-percent-calculation in your project. Codex loads it when a task matches its description.

Can I use Chemical Mass Percent Calculation 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 InternScience/scp --skill chemical-mass-percent-calculation -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/chemical-mass-percent-calculation, .gemini/skills/chemical-mass-percent-calculation, .github/skills/chemical-mass-percent-calculation and .opencode/skills/chemical-mass-percent-calculation in your project.

What does Chemical Mass Percent Calculation need to run?

SKILL.md names no scripts, command-line tools or credentials: Chemical Mass Percent Calculation is instructions for the agent only. Our summary lists: Python 3.

Does Chemical Mass Percent Calculation 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 Chemical Mass Percent Calculation 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 Chemical Mass Percent Calculation use?

Chemical Mass Percent Calculation is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Chemical Mass Percent Calculation use?

About 521 tokens (SKILL.md is roughly 2.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Chemical Mass Percent Calculation?

Skills that share tags, products or a category with Chemical Mass Percent Calculation: Tooluniverse Chemical Compound Retrieval (wu-yc/LabClaw, 1.1k stars), Chemical Compound Retrieval (lamm-mit/scienceclaw, 246 stars), Compute Mamba Ratio (sgl-project/sglang, 37k stars) and Mass-ULW Workflow Runs (code-yeongyu/oh-my-openagent, 70k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Chemical Mass Percent Calculation?

InternScience (a GitHub organization) maintains it in InternScience/scp, which has 170 GitHub stars. The repository holds 73 skills in this directory. The repository was last updated on June 3, 2026.

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