molclaw-rgroup-sampling

molclaw-rgroup-sampling is a skill for Claude Code, Codex from InternScience/MolClaw. It costs 17 tokens per session (403 once invoked), scanned A, original, MIT.

A tool for creating new molecules by filling variable groups on a supplied chemical scaffold, a molecule’s fixed structural framework.

In plain words
What is it for?
It helps sample molecules from a scaffold SMILES string and save or return the generated structures.
Why use it?
It automates generating chemical variations from one starting structure while optionally applying Lipinski filters, common drug-likeness checks.

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-rgroup-sampling
Any agent
npx skills add InternScience/MolClaw --skill molclaw-rgroup-sampling
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-rgroup-sampling

README.md
[![agentmods](https://agentmods.dev/badge/skills/internscience/molclaw/molclaw-rgroup-sampling.svg)](https://agentmods.dev/skills/internscience/molclaw/molclaw-rgroup-sampling)
Your own site
<a href="https://agentmods.dev/skills/internscience/molclaw/molclaw-rgroup-sampling"><img src="https://agentmods.dev/badge/skills/internscience/molclaw/molclaw-rgroup-sampling.svg" alt="Measured on agentmods" height="20"></a>
Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 403 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 $0.00017 $0.00403
Opus 5 $0.00009 $0.00201
Sonnet 5 $0.00003 $0.00081
Haiku 4.5 $0.00002 $0.00040

Measured 5d ago against content hash 2270622b74ac, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

molclaw-rgroup-sampling 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 5d 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-rgroup-sampling/SKILL.md · 47 lines

What it actually says

Molecule Generation from Scaffold

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 libinvent_rgroup_sampling_by_scaffold.

Generate new molecules sampling from the input scaffold.
Args:
    scaffold (str): Input scaffold SMILES string containing R-group position markers such as [*:1], [*:2], etc. e.g., 'c1ccc([*:1])cc1C(=O)N[*:2]'
    n (int): Number of molecules for sampling
    lipinski (bool): Required flag controlling Lipinski filtering (commonly True)
    filter_preset (str): Required filter preset; options: ['none', 'minimal', 'default', 'strict'] (commonly 'default')
Return:
    status (str): success/error
    msg (str): message
    save_smiles_file (str): Path to the saved SMILES file
    output_smiles_list (List[str]): List of generated SMILES strings

How to use tool libinvent_rgroup_sampling_by_scaffold :

response = await client.session.call_tool(
    "libinvent_rgroup_sampling_by_scaffold",
    arguments={
        "scaffold": scaffold,
        "n": n,
        "lipinski": True,
        "filter_preset": filter_type
    }
)
result = client.parse_result(response)
output_smiles_list = result["output_smiles_list"]
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. 5d ago First seen · 47 lines · 17 tokens per session scan A 2270622b74ac

Subscribe to this mod's changes

molclaw-rgroup-sampling is a skill published in the GitHub repository InternScience/MolClaw (33 stars, last pushed 29d ago), licensed MIT. It adds 17 tokens to every session and 403 once invoked, about $0.0001 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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