Agent skill

Sar Analysis

by jaechang-hits in jaechang-hits/SciAgent-Skills

Structure-activity relationship (SAR) analysis guide for drug discovery including molecular descriptor analysis, scaffold analysis, and activity cliff detection.

Custom licenceAuto-check passedResearch & Science

Install Sar Analysis

skills CLI
$ npx skills add jaechang-hits/SciAgent-Skills --skill sar-analysis -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install jaechang-hits/SciAgent-Skills sar-analysis --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/jaechang-hits/SciAgent-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/structural-biology-drug-discovery/sar-analysis .claude/skills/sar-analysis && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
sar-analysis
GitHub stars
371
Used in
1 other repo
Token cost
~5.8k tokens
SKILL.md length
2,601 words
Files
1
Skills in repo
169
Repo updated
First seen
Licence
Custom licence

At a glance

Structure-activity relationship (SAR) analysis guide for drug discovery including molecular descriptor analysis, scaffold analysis, and activity cliff detection.

  • Works in 8 steps: Inspect the dataframe before assuming… → Add explicit hydrogens before MCS.… → Prune constant R-positions. Any… → …
  • Tasks that involve Drug discovery and cheminformatics
  • SKILL.md covers Metadata, Overview, Key Concepts and Decision Framework, plus 4 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Sar Analysis is an agent skill from jaechang-hits/SciAgent-Skills. Structure-activity relationship (SAR) analysis guide for drug discovery including molecular descriptor analysis, scaffold analysis, and activity cliff detection.

Its SKILL.md is about 5.8k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Research & Science, covering Drug discovery and cheminformatics. It works with RDKit. The repository describes itself as: 197 bioinformatics & life science skills for Claude Code and AI agents — BixBench 92.0% accuracy. RNA-seq, single-cell, drug discovery, proteomics, and more. Powers OmicsHorizon.

When your agent uses it

  • Tasks that involve Drug discovery and cheminformatics

Example prompts

  • “/sar-analysis”

Requirements

  • Python 3

Workflow steps

8 steps, taken from the first numbered list in SKILL.md.

  1. Inspect the dataframe before assuming column names. Real-world activity tables vary; auto-detect the SMILES, activity, and ID columns from…
  2. Add explicit hydrogens before MCS. Chem.AddHs lets MCS reason correctly about heavy-atom valence and ring closures; without it…
  3. Prune constant R-positions. Any R-position whose fragment is identical across every analogue contributes no SAR information; remove that…
  4. Always align fragments to the parent molecule, not the other way around. Copy coordinates from the parent onto each fragment via the…
  5. Use a log-scale activity heatmap. Potency typically spans 2–4 orders of magnitude; a linear color scale collapses the interesting low-IC50…
  6. Justify every SAR claim with a pairwise contrast at the same R-position. Statements like "small electron-withdrawing groups improve…
  7. Test 3-4 analogues per design hypothesis. A single substitution change can be confounded by experimental noise; multiple analogues at the…
  8. Render with DrawMoleculeACS1996. ACS1996 styling produces consistent bond lengths, atom labels, and font choices that match…

What it can do on your machine

Read from SKILL.md and the folder at commit 82c862c. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • rdkit.org
    • doi.org
    • pubs.acs.org

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Sar Analysis loads about 5.8k tokens when it runs. Until then it costs about 44 tokens; SKILL.md has 2,601 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~44
When it runs · the whole SKILL.md, loaded when a task matches
~5.8k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 2,601 words (~5,789 tokens).

“Short Description: Comprehensive guide for performing Structure-Activity Relationship (SAR) analysis using RDKit.”

— opening of SKILL.md by jaechang-hits, Custom licence
name
sar-analysis
license
open

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills/structural-biology-drug-discovery/sar-analysis of jaechang-hits/SciAgent-Skills.

Open the folder on GitHubat commit 82c862c

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in jaechang-hits/SciAgent-Skills, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Sar Analysis next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Sar Analysis compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Sar Analysis this skilljaechang-hits/SciAgent-Skills3711 repos~5.8kAutomated safety check: PassCustom licence
DiffDock Molecular DockingK-Dense-AI/scientific-agent-skills48k1 repos~3kAutomated safety check: NotesMIT
Edu Chem Reactionwy51ai/edulab1.4k—~1.2kAutomated safety check: PassApache-2.0
Biopipelineslocbp-uzh/biopipelines109—~2.4kAutomated safety check: PassMIT
RDKit Cheminformatics Practicesaiming-lab/AutoResearchClaw15k—~708Automated safety check: PassMIT
Rowanlamm-mit/scienceclaw2444 repos~3.1kAutomated safety check: WarnProprietary

Similar skills

  • DiffDock Molecular Docking

    K-Dense-AI/scientific-agent-skills

    Predicts how small molecules bind to a protein with DiffDock, covering batch docking, pose ranking by confidence and checks on the results; not for binding affinity.

    48k GitHub starsUsed in 1 repo~3k tokens
    Research & ScienceAuto-check: notes
  • Edu Chem Reaction

    wy51ai/edulab

    把一个化学反应做成自包含的微观 3D 交互演示网页:左/上为 Three.js 可交互分子动画 (拖滑块看断键·成键·原子重组,分步高亮),右为 KaTeX 反应方程 + 分步讲解 + 原子守恒计数 + 可选能量-反应进程曲线。支持三入口——给定文字反应/方程、随机出题、上传图片识别后演示。

    1.4k GitHub stars~1.2k tokensUpdated 11 days ago
    Research & ScienceAuto-check passed
  • Biopipelines

    locbp-uzh/biopipelines

    Design and run computational protein and ligand workflows on a GPU: binder and enzyme design, de novo backbone generation, inverse folding and sequence redesign, structure prediction, protein-ligand…

    109 GitHub stars~2.4k tokensUpdated 9 days ago
    Research & ScienceAuto-check passed
  • RDKit Cheminformatics Practices

    aiming-lab/AutoResearchClaw

    Reference guide for working with molecules in RDKit: reading SMILES and SDF files, computing descriptors and fingerprints, and searching substructures.

    15k GitHub stars~708 tokensUpdated 1 mo ago
    Research & ScienceAuto-check passed
  • Rowan

    lamm-mit/scienceclaw

    Cloud-based quantum chemistry platform with Python API. An agent skill from lamm-mit/scienceclaw.

    244 GitHub starsUsed in 4 repos~3.1k tokens
    Research & ScienceAuto-check: warnings
  • Coot Rdkit

    pemsley/coot

    RDKit molecular manipulation and visualization within Coot's Python environment.

    168 GitHub stars~981 tokensUpdated yesterday
    Research & ScienceAuto-check passed

More from jaechang-hits/SciAgent-Skills

All 169 skills in this repo
  • Neb Irc Activation Energy

    jaechang-hits/SciAgent-Skills

    NEB-IRC activation energy pipeline for reaction barriers using GFN2-xTB and pysisyphus.

    371 GitHub stars~4k tokensUpdated 10 days ago
    Auto-check passed
  • Molecular Visualization 3dmol

    jaechang-hits/SciAgent-Skills

    3Dmol.js WebGL molecular visualization emitted as self-contained HTML.

    371 GitHub stars~3.2k tokensUpdated 10 days ago
    Auto-check passed
  • Cobrapy Metabolic Modeling

    jaechang-hits/SciAgent-Skills

    Constraint-based (COBRA) analysis of genome-scale metabolic models: FBA, FVA, knockouts, flux sampling, production envelopes, gapfilling, media optimization.

    371 GitHub starsUsed in 1 repo~4.9k tokens
    Auto-check passed
  • Rdkit Chemdraw Cdxml

    jaechang-hits/SciAgent-Skills

    Read, write, and edit ChemDraw CDX/CDXML files with RDKit's rdkit.Chem.rdChemDraw plus direct XML editing, always paired with a rendered PNG.

    371 GitHub stars~6.9k tokensUpdated 10 days ago
    Auto-check passed
  • Pubmed Database

    jaechang-hits/SciAgent-Skills

    Programmatic PubMed access via NCBI E-utilities REST API. An agent skill from jaechang-hits/SciAgent-Skills.

    371 GitHub starsUsed in 1 repo~4.4k tokens
    Auto-check passed
  • Sciagent Skill Creator

    jaechang-hits/SciAgent-Skills

    Scaffold a new SciAgent-Skills entry. An agent skill from jaechang-hits/SciAgent-Skills.

    371 GitHub stars~2.3k tokensUpdated 10 days ago
    Auto-check passed

Works with

Questions about Sar Analysis

What does Sar Analysis do?

Structure-activity relationship (SAR) analysis guide for drug discovery including molecular descriptor analysis, scaffold analysis, and activity cliff detection. Sar Analysis is an agent skill from jaechang-hits/SciAgent-Skills. Structure-activity relationship (SAR) analysis guide for drug discovery including molecular descriptor analysis, scaffold analysis, and activity cliff detection.

When should I use Sar Analysis?

Sar Analysis fits situations like: tasks that involve Drug discovery and cheminformatics.

How do I install Sar Analysis in Claude Code?

Run `npx skills add jaechang-hits/SciAgent-Skills --skill sar-analysis -a claude-code`. Or copy the skill folder (skills/structural-biology-drug-discovery/sar-analysis in jaechang-hits/SciAgent-Skills) into .claude/skills/sar-analysis in your project. Claude Code loads it when a task matches its description.

How do I install Sar Analysis in Codex?

Run `npx skills add jaechang-hits/SciAgent-Skills --skill sar-analysis -a codex`. Or copy the skill folder (skills/structural-biology-drug-discovery/sar-analysis in jaechang-hits/SciAgent-Skills) into .agents/skills/sar-analysis in your project. Codex loads it when a task matches its description.

Can I use Sar Analysis in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add jaechang-hits/SciAgent-Skills --skill sar-analysis -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/sar-analysis, .gemini/skills/sar-analysis, .github/skills/sar-analysis and .opencode/skills/sar-analysis in your project.

What does Sar Analysis need to run?

SKILL.md names no scripts, command-line tools or credentials: Sar Analysis is instructions for the agent only. Our summary lists: Python 3.

Does Sar Analysis access the network?

SKILL.md names 3 domains. As links in the text: rdkit.org, doi.org and pubs.acs.org. This is read from the text; nothing was executed.

Is Sar Analysis safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Sar Analysis use?

Sar Analysis has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Sar Analysis use?

About 5.8k tokens (SKILL.md is roughly 23k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Sar Analysis?

Skills that share tags, products or a category with Sar Analysis: DiffDock Molecular Docking (K-Dense-AI/scientific-agent-skills, 48k stars), Edu Chem Reaction (wy51ai/edulab, 1.4k stars), Biopipelines (locbp-uzh/biopipelines, 109 stars) and RDKit Cheminformatics Practices (aiming-lab/AutoResearchClaw, 15k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Sar Analysis?

jaechang-hits (a GitHub user) maintains it in jaechang-hits/SciAgent-Skills, which has 371 GitHub stars. The repository holds 169 skills in this directory. The repository was last updated on September 29, 2026.

Source: jaechang-hits/SciAgent-Skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.