molclaw-linker-sampling

molclaw-linker-sampling is a skill for Claude Code, Codex from InternScience/MolClaw. It costs 20 tokens per session (476 once invoked), scanned A, original, MIT.

A molecule-generation workflow that connects two chemical fragments, called warheads, with sampled linker structures. Warheads are parts of a molecule designed to interact with a biological target; a linker joins them.

In plain words
What is it for?
Use it with two warhead SMILES strings to generate molecules, optionally apply Lipinski and preset filters, and save the resulting SMILES strings.
Why use it?
It helps produce candidate molecules while applying selected filters and linker-size limits.

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

README.md
[![agentmods](https://agentmods.dev/badge/skills/internscience/molclaw/molclaw-linker-sampling.svg)](https://agentmods.dev/skills/internscience/molclaw/molclaw-linker-sampling)
Your own site
<a href="https://agentmods.dev/skills/internscience/molclaw/molclaw-linker-sampling"><img src="https://agentmods.dev/badge/skills/internscience/molclaw/molclaw-linker-sampling.svg" alt="Measured on agentmods" height="20"></a>
Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 476 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 $0.00020 $0.00476
Opus 5 $0.00010 $0.00238
Sonnet 5 $0.00004 $0.00095
Haiku 4.5 $0.00002 $0.00048

Measured 4d ago against content hash 7352a7ef0afc, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

molclaw-linker-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 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-linker-sampling/SKILL.md · 51 lines

What it actually says

Molecule Generation from Warhead Fragments

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 linkinvent_linker_sampling_by_warheads.

Generate new molecules sampling from the input two warhead fragments.
Args:
    warheads (str): SMILES of two warheads separated by '|', e.g., '*c1ccc(O)cc1|*N1CCNCC1'
    n (int): Number of molecules for sampling
    filter_preset (str): Required filter preset; options: ['none', 'minimal', 'default', 'strict'] (commonly 'default')
    lipinski (bool): Required flag controlling Lipinski filtering (commonly True)
    min_linker_atoms (int): Required minimum number of atoms in the linker (use 0 for no lower bound)
    max_linker_atoms (int): Required maximum number of atoms in the linker (use 0 for no upper bound)
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 linkinvent_linker_sampling_by_warheads :

response = await client.session.call_tool(
    "linkinvent_linker_sampling_by_warheads",
    arguments={
        "warheads": warheads,
        "n": n,
        "lipinski": True,
        "filter_preset": filter_type,
        "min_linker_atoms": min_linker_atoms,
        "max_linker_atoms": max_linker_atoms
    }
)
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. 4d ago First seen · 51 lines · 20 tokens per session scan A 7352a7ef0afc

Subscribe to this mod's changes

molclaw-linker-sampling is a skill published in the GitHub repository InternScience/MolClaw (33 stars, last pushed 28d ago), licensed MIT. It adds 20 tokens to every session and 476 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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