molclaw-pack-sidechains

molclaw-pack-sidechains is a skill for Claude Code, Codex from InternScience/MolClaw. It costs 31 tokens per session (794 once invoked), scanned A, original, MIT.

A protein-structure tool that predicts the positions of sidechain atoms from a backbone PDB file. A PDB file is a standard text format describing a molecule’s three-dimensional structure.

In plain words
What is it for?
Use it to pack protein sidechains from backbone structures, with options for compute devices, long proteins, post-processing, and test runs.
Why use it?
It fills in missing atomic detail needed for preparing a protein structure for later analysis.

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-pack-sidechains
Any agent
npx skills add InternScience/MolClaw --skill molclaw-pack-sidechains
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-pack-sidechains

README.md
[![agentmods](https://agentmods.dev/badge/skills/internscience/molclaw/molclaw-pack-sidechains.svg)](https://agentmods.dev/skills/internscience/molclaw/molclaw-pack-sidechains)
Your own site
<a href="https://agentmods.dev/skills/internscience/molclaw/molclaw-pack-sidechains"><img src="https://agentmods.dev/badge/skills/internscience/molclaw/molclaw-pack-sidechains.svg" alt="Measured on agentmods" height="20"></a>
Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 794 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 $0.00031 $0.00794
Opus 5 $0.00015 $0.00397
Sonnet 5 $0.00006 $0.00159
Haiku 4.5 $0.00003 $0.00079

Measured 4d ago against content hash e865724e3707, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

molclaw-pack-sidechains 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-pack-sidechains/SKILL.md · 92 lines

How it starts

The opening of the file, as written. The whole thing — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AttnPacker Sidechain Packing

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.

Usage

1. Protein Sidechain Packing

The description of tool pack_sidechains.

Predict full-atom sidechain conformations from backbone PDBs for protein structure preparation workflows.
Args:
  input_pdb (str): Input PDB file path, required.
  device (str|None): Compute device such as cuda:0, default None (auto by source script).
  chunk_size (int): Inference chunk size for long proteins, default 500.
  no_post_process (bool): Skip rotamer post-processing for faster runtime, default False.
  max_optim_iters (int): Maximum optimization iterations in post-process, default 250.
  steric_wt (float): Steric clash penalty weight, default 1.0.
  optim_repeats (int): Post-process optimization repeats, default 2.
  dry_run (bool): Create a traceable run directory without running inference, default False.
Return:
  status (str): 'success', 'error', or 'partial_success'.
  msg (str): Human-readable execution message.
  input_pdb (str): Input PDB path used for this run.
  output_dir (str): Unique run directory under tool_result/pack_sidechains_result.
  output_pdb (str): Expected or generated output PDB path.
  device (str|None): Device value used for execution.
  chunk_size (int): Chunk size used.
  no_post_process (bool): Whether post-process was skipped.
  max_optim_iters (int): Max optimization iterations used.
  steric_wt (float): Steric weight used.
  optim_repeats (int): Optimization repeats used.
  dry_run (bool): Whether dry-run mode was used.
  error_type (str, optional): Exception type when status is 'error'.
  traceback (str, optional): Python traceback when status is 'error'.

How to use tool pack_sidechains :

Read the full file on GitHub · 92 lines

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 · 92 lines · 31 tokens per session scan A e865724e3707

Subscribe to this mod's changes

molclaw-pack-sidechains is a skill published in the GitHub repository InternScience/MolClaw (33 stars, last pushed 27d ago), licensed MIT. It adds 31 tokens to every session and 794 once invoked, about $0.0002 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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