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.
npx skills add InternScience/MolClaw --skill molclaw-mol-similaritygit clone --depth 1 https://github.com/InternScience/MolClawWrote 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.
[](https://agentmods.dev/skills/internscience/molclaw/molclaw-mol-similarity)<a href="https://agentmods.dev/skills/internscience/molclaw/molclaw-mol-similarity"><img src="https://agentmods.dev/badge/skills/internscience/molclaw/molclaw-mol-similarity/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/internscience/molclaw/molclaw-mol-similarity"><img src="https://agentmods.dev/badge/skills/internscience/molclaw/molclaw-mol-similarity.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00078 | $0.00777 |
| Opus 5.5 | $0.00031 | $0.00311 |
| Sonnet 5.5 | $0.00016 | $0.00155 |
| Haiku 4.5 | $0.00008 | $0.00078 |
Grade A, and why
molclaw-mol-similarity 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Molecule Similarity Calculation
Invocation
Use the exact tool name and parameter schema exposed by the current harness. Tool names in SDK examples below are raw MCP names, not model-facing aliases. Local files must be uploaded with molclaw-file-transfer before a server tool can use them. Repair PDB inputs first when the workflow requires it.
Scene 1: Compute the Tanimoto similarities between a target molecule and a list of candidate molecules using Morgan fingerprints. Need to use the tool calculate_morgan_fingerprint_similarity.
The description of tool calculate_morgan_fingerprint_similarity.
Compute the Tanimoto similarities between a target molecule and a list of candidate molecules using Morgan fingerprints.
Args:
target_smiles (str): SMILES string of the target molecule
candidate_smiles_list (List[str]): List of candidate molecule SMILES strings
radius (int): Required Morgan fingerprint radius (commonly 2)
nBits (int): Required Morgan fingerprint vector bit count (commonly 2048)
Return:
status (str): success/error
msg (str): message
similarities (List[dict]): List of dict, each containing the keys 'smiles' and 'score'.
--smiles (str): A SMILES string of candidate_smiles_list
--score (float): Similarity value between the candidate SMILES and the target SMILES
How to use tool calculate_morgan_fingerprint_similarity :
response = await client.session.call_tool(
"calculate_morgan_fingerprint_similarity",
arguments={
"target_smiles": target_smiles,
"candidate_smiles_list": candidate_smiles_list,
"radius": radius,
"nBits": nBits
}
)
result = client.parse_result(response)
similarities = result["similarities"]
Scene 2: Compute the count of shared structural fragments between a target molecule and a list of candidate molecules using Morgan fingerprints. Need to use the tool calculate_common_fragments.
The description of tool calculate_common_fragments.
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.
- 1mo ago Changed · -1 lines · +42 tokens per session 04fa8886a073
- 1mo ago First seen · 83 lines · 36 tokens per session scan A fb4211d36610
molclaw-mol-similarity is a skill published in the GitHub repository InternScience/MolClaw (38 stars, last pushed 1mo ago), licensed MIT. It adds 78 tokens to every session and 777 once invoked, about $0.0003 per session on Opus 5.5. 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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