diffdock

A tool for predicting how a small-molecule drug may fit onto a protein in 3D. It can search the whole protein surface without being told where the binding site is and ranks possible fits by pose quality.

In plain words
What is it for?
Use it to dock a molecule to a protein, predict possible binding poses, search for unknown binding sites, or process batches of molecules.
Why use it?
It removes the need to specify a binding pocket before testing a molecule. Its confidence score helps identify likely pose accuracy, but it does not measure how strongly the molecule binds.

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/naity/fm4life/diffdock
Any agent
npx skills add naity/FM4Life --skill diffdock
Clone the repo
git clone --depth 1 https://github.com/naity/FM4Life

Made for: Claude Code, Codex.

Per session 95 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,740 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 $0.00095 $0.01740
Opus 5 $0.00048 $0.00870
Sonnet 5 $0.00019 $0.00348
Haiku 4.5 $0.00010 $0.00174

Measured yesterday against content hash 487c0d72109c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

diffdock 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 yesterday.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/dock.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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/diffdock/SKILL.md · 171 lines

How it starts

The opening of the file, as written. The whole thing — 171 lines — stays where its author put it; the contents beside it link to each section on GitHub.

DiffDock: Diffusion-Based Molecular Docking

Overview

DiffDock predicts 3D protein-ligand binding poses using a diffusion model. Given a protein structure and a ligand SMILES string, it generates multiple candidate poses ranked by a confidence score.

Key properties:

  • Blind docking — no binding site specification required; searches entire protein surface
  • Diffusion model — generates diverse poses via iterative denoising (score-based diffusion)
  • SE(3)-equivariant — architecture respects 3D symmetry (rotations, translations)
  • Confidence model — separate network ranks poses by predicted accuracy (not binding affinity)
  • Current default: DiffDock-L (ICLR 2024) — improved generalization over original (ICLR 2023)

Important distinction: The confidence score predicts pose quality (RMSD to true binding pose), not binding affinity. High confidence ≠ strong binder.

Installation

DiffDock requires a conda environment — no pip-only install available:

git clone https://github.com/gcorso/DiffDock.git
cd DiffDock
conda env create --file environment.yml
conda activate diffdock

Or with Docker (includes GPU support):

docker pull rbgcsail/diffdock
docker run -it --gpus all --entrypoint /bin/bash rbgcsail/diffdock
micromamba activate diffdock

Key dependencies: PyTorch 1.13 + CUDA 11.7, torch-geometric 2.2, e3nn 0.5.1, RDKit, fair-esm (ESM-2 for protein embeddings), pytorch-lightning.

First run: precomputes SO(2)/SO(3) distribution caches (~2 min). Not repeated.

Core Usage

Single complex

cd DiffDock
python -m inference \
  --config default_inference_args.yaml \
  --protein_path protein.pdb \
  --ligand_description "COc(cc1)ccc1C#N" \
  --out_dir results/my_docking

From protein sequence (ESMFold folds it automatically)

python -m inference \
  --config default_inference_args.yaml \
  --protein_sequence "MVHLTPEEKSAVTALWGKVNVDEVGGEALGRLLVVYPWTQRFFESFGDLSTPDAVMGNPKVKAHGKKVLGAFSDGLAHLDNLKGTFATLSELHCDKLHVDPENFRLLGNVLVCVLAHHFGKEFTPPVQAAYQKVVAGVANALAHKYH" \
  --ligand_description "CC(=O)Nc1ccc(O)cc1" \
  --out_dir results/my_docking

Read the full file on GitHub · 171 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. yesterday First seen · 171 lines · 95 tokens per session scan A 487c0d72109c

Subscribe to this mod's changes

diffdock is a skill published in the GitHub repository naity/FM4Life (2 stars, last pushed 4mo ago), licensed MIT. It adds 95 tokens to every session and 1,740 once invoked, about $0.0005 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 2026-08-31.

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