atomistic-workflows

atomistic-workflows is a skill for Claude Code from synthetic-sciences/openscience. It costs 138 tokens per session (2,327 once invoked), scanned A, original, Apache-2.0.

A guide to reproducible atomistic simulations, which calculate how atoms and molecules behave. It covers tools such as ASE, pymatgen, LAMMPS, GROMACS, and the Materials Project API.

In plain words
What is it for?
Use it to build and document structure calculations, relax atomic geometries, run molecular dynamics, inspect symmetry, and test settings such as k-point grids and plane-wave cutoffs.
Why use it?
Simulation results can change when units, structure choices, convergence settings, or stopping rules are left unspecified. This guide makes those choices explicit so calculations can be repeated and checked.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Good fit Use it to build and document structure calculations, relax atomic geometries, run molecular dynamics, inspect symmetry, and test settings such as k-point grids and plane-wave cutoffs.

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Install with agentmods
npx agentmods add skills/synthetic-sciences/openscience/atomistic-workflows
About the project

synthetic-sciences/openscience is an AI workbench that carries out scientific research by reading papers, forming hypotheses, writing and running code, conducting experiments, analyzing results, and preparing reports. Researchers use it for work in machine learning, biology, physics, and chemistry with remote or local models. Catalogue add-ons extend its scientific workflows through skills and instructions.

synthetic-sciences/openscience · 4,025 stars · on GitHub · openscience.sh

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.

Any agent
npx skills add synthetic-sciences/openscience --skill atomistic-workflows
Clone the repo
git clone --depth 1 https://github.com/synthetic-sciences/openscience

Made for: Claude Code.

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 atomistic-workflows

README.md
[![agentmods](https://agentmods.dev/badge/skills/synthetic-sciences/openscience/atomistic-workflows/github.svg)](https://agentmods.dev/skills/synthetic-sciences/openscience/atomistic-workflows)
Your own site
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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.

agentmods 80×15 button for atomistic-workflows

Your own site · 80×15
<a href="https://agentmods.dev/skills/synthetic-sciences/openscience/atomistic-workflows"><img src="https://agentmods.dev/badge/skills/synthetic-sciences/openscience/atomistic-workflows.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 138 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,327 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00138 $0.02327
Opus 5.5 $0.00055 $0.00931
Sonnet 5.5 $0.00028 $0.00465
Haiku 4.5 $0.00014 $0.00233

Measured 1mo ago against content hash dc92ff1e4194, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

atomistic-workflows 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.

backend/cli/skills/chemistry/atomistic-workflows/SKILL.md · 121 lines

How it starts

The opening of the file, as written. The whole thing — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Atomistic workflows

An atomistic number is defined only together with its code, units, convergence parameters and stopping criteria; a "DFT energy" without k-mesh and cutoff cannot be reproduced.

ASE

  1. Atoms(symbols, positions, cell, pbc); ase.io.read and write convert between formats (read("traj.xyz", index=":") for all frames). Internal units are eV and angstrom; ase.units supplies fs, kB, Hartree and Bohr for conversion (the native time unit is about 10.18 fs, so always multiply by units.fs). Attach a calculator with atoms.calc = ... (EMT, ase.calculators.vasp.Vasp, espresso.Espresso, lammpslib.LAMMPSlib, a machine-learned potential), then get_potential_energy(), get_forces(), get_stress() (eV per cubic angstrom).
  2. Relaxation: from ase.optimize import BFGS, LBFGS, FIRE, then opt = BFGS(atoms, trajectory="opt.traj", logfile="opt.log") and opt.run(fmax=0.01, steps=500). fmax is the largest force on any atom in eV per angstrom: 0.05 is loose, 0.01 standard, 0.001 for phonons. Relax the cell with FrechetCellFilter from ase.filters wrapped around the atoms; fix atoms with FixAtoms. Check that opt.run returned converged rather than exhausting steps.
  3. MD: MaxwellBoltzmannDistribution(atoms, temperature_K=300) and Stationary(atoms), then Langevin(atoms, 1.0 * units.fs, temperature_K=300, friction=0.01 / units.fs) or NVTBerendsen, NPT; dyn.run(steps) with a trajectory attached; record the seed.

pymatgen

  1. Structure.from_file("POSCAR") or a CIF; structure.to(filename="out.cif"). Symmetry via SpacegroupAnalyzer(structure, symprec=0.01, angle_tolerance=5) with get_space_group_symbol() and get_conventional_standard_structure(); symprec changes the answer (0.01 angstrom strict, 0.1 loose), so report it. Kpoints.automatic_density(structure, kppa=1000) sets k-mesh density per reciprocal atom. Vasprun("vasprun.xml") exposes final_energy, converged_electronic and converged_ionic; read both flags. AseAtomsAdaptor bridges to ASE.
  2. Materials Project: from mp_api.client import MPRester, then mpr.materials.summary.search(formula="Fe2O3", fields=[...]) with fields such as material_id, structure, energy_above_hull and band_gap. Database energies carry their own functional and correction scheme; never mix them with raw energies from your own runs without applying the same corrections. Record the database release and the material_id.

Read the full file on GitHub · 121 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. 1mo ago First seen · 121 lines · 138 tokens per session scan A dc92ff1e4194

Subscribe to this mod's changes

atomistic-workflows is a skill published in the GitHub repository synthetic-sciences/openscience (4,025 stars, last pushed today), licensed Apache-2.0. It adds 138 tokens to every session and 2,327 once invoked, about $0.0006 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 2026-09-15.