molclaw-mol-basic-metrics

molclaw-mol-basic-metrics is a skill for Claude Code, Codex from InternScience/MolClaw. It costs 59 tokens per session (468 once invoked), scanned A, original, MIT.

A calculator for basic properties of molecules described as SMILES strings, a text format for writing molecular structures. It returns formulas, molecular weights, atom and bond counts, valence electrons, and formal charge.

In plain words
What is it for?
Use it to summarize and compare molecules from SMILES input. It is intended for chemical or drug-discovery workflows that need these basic measurements.
Why use it?
It removes the need to calculate these common molecular properties by hand or with separate tools. It also processes a list of molecules together.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/internscience/molclaw/molclaw-mol-basic-metrics
Any agent
npx skills add InternScience/MolClaw --skill molclaw-mol-basic-metrics
Clone the repo
git clone --depth 1 https://github.com/InternScience/MolClaw

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for molclaw-mol-basic-metrics

README.md
[![agentmods](https://agentmods.dev/badge/skills/internscience/molclaw/molclaw-mol-basic-metrics.svg)](https://agentmods.dev/skills/internscience/molclaw/molclaw-mol-basic-metrics)
Your own site
<a href="https://agentmods.dev/skills/internscience/molclaw/molclaw-mol-basic-metrics"><img src="https://agentmods.dev/badge/skills/internscience/molclaw/molclaw-mol-basic-metrics.svg" alt="Measured on agentmods" height="20"></a>
Per session 59 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 468 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00059 $0.00468
Opus 5 $0.00030 $0.00234
Sonnet 5 $0.00012 $0.00094
Haiku 4.5 $0.00006 $0.00047

Measured 4d ago against content hash 85796a18c6d8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

molclaw-mol-basic-metrics 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.

skills/L1_tools/molclaw-mol-basic-metrics/SKILL.md · 49 lines

What it actually says

Molecular Basic Properties Calculation

Note:

  • Local files are not directly accessible by the server. Please upload them to the server using molclaw-file-transfer before execution.
  • For PDB file inputs, it is recommended to preprocess them using molclaw-pdbfixer before execution.
  • Please refer to skill molclaw-scp-server to complete tool invocation.

The description of tool calculate_mol_basic_info.

Compute a set of basic molecular properties for each SMILES.
Args:
    smiles_list (List[str]): List of input SMILES strings, (e.g., ["N[C@@H](Cc1ccc(O)cc1)C(=O)O", "CC(C)C1=CC=CC=C1"])
Return:
    status (str): success/error
    msg (str): message
    metrics (List[dict]): List of dict, each containing feature keys.
        --smiles (str): A SMILES string of smiles_list
        --molecular_formula (str): Molecular formula, e.g. "C9H11NO3"
        --exact_molecular_weight (float): Exact molecular weight
        --molecular_weight (float): Average molecular weight
        --num_heavy_atoms (int): Number of heavy atoms
        --num_atoms (int): Number of total atoms
        --num_bonds (int): Number of bonds
        --num_valence_electrons (int): Number of valence electrons
        --formal_charge (int): Number of formal charge

How to use tool calculate_mol_basic_info:

response = await client.session.call_tool(
    "calculate_mol_basic_info",			
    arguments={
        "smiles_list": smiles_list
    }
)
result = client.parse_result(response)
metrics = result["metrics"]
Changes

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.

  1. 4d ago First seen · 49 lines · 59 tokens per session scan A 85796a18c6d8

Subscribe to this mod's changes

molclaw-mol-basic-metrics is a skill published in the GitHub repository InternScience/MolClaw (33 stars, last pushed 27d ago), licensed MIT. It adds 59 tokens to every session and 468 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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