sc-de

sc-de is a skill for Claude Code, Codex from TianGzlab/OmicsClaw. It costs 51 tokens per session (1,593 once invoked), scanned A, original, Apache-2.0.

A single-cell RNA sequencing analysis that finds genes distinguishing cell clusters or genes whose expression changes between conditions. It supports both per-cell comparisons and replicate-aware comparisons using aggregated counts.

In plain words
What is it for?
Use it to find cluster marker genes, compare conditions, and produce differential-expression tables and plots.
Why use it?
It helps identify what defines a cell population and what changes across experimental groups without confusing those two questions.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to find cluster marker genes, compare conditions, and produce differential-expression tables and plots.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/tiangzlab/omicsclaw/sc-de
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 TianGzlab/OmicsClaw --skill sc-de
Clone the repo
git clone --depth 1 https://github.com/TianGzlab/OmicsClaw

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 sc-de

README.md
[![agentmods](https://agentmods.dev/badge/skills/tiangzlab/omicsclaw/sc-de.svg)](https://agentmods.dev/skills/tiangzlab/omicsclaw/sc-de)
Your own site
<a href="https://agentmods.dev/skills/tiangzlab/omicsclaw/sc-de"><img src="https://agentmods.dev/badge/skills/tiangzlab/omicsclaw/sc-de.svg" alt="Measured on agentmods" height="20"></a>
Per session 51 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,593 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high Rogue Agent · line 3
    Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.
    Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
How audits are shown
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 $0.00051 $0.01593
Opus 5 $0.00026 $0.00796
Sonnet 5 $0.00010 $0.00319
Haiku 4.5 $0.00005 $0.00159

Measured 4d ago against content hash 4443e57bc72c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

sc-de 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.

The scan reads SKILL.md. This mod also ships 3 executable files (sc_de.py, tests/__init__.py, tests/test_sc_de.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/singlecell/scrna/sc-de/SKILL.md · 123 lines

How it starts

The opening of the file, as written. The whole thing — 123 lines — stays where its author put it; the contents beside it link to each section on GitHub.

sc-de

When to use

The user has a preprocessed scRNA-seq AnnData and wants to know either (a) which genes mark each cluster (Wilcoxon / t-test / logreg ranking) or (b) which genes change between conditions in a replicate-aware way (deseq2_r pseudobulk). Five backends are exposed; the wrapper enforces the matrix contract (normalized expression vs raw counts) per backend because mixing them is the most common silent-wrong-answer failure mode.

Inputs & Outputs

Inputs

  • Modalities: scrna
  • File types: .h5ad
  • Requires a preprocessed AnnData (X normalised, PCA/neighbours present)

Outputs

  • tables/counts.csv
  • tables/de_full.csv
  • tables/de_group_summary.csv
  • tables/de_top_markers.csv
  • tables/deseq2_results.csv
  • tables/gene_expression.csv
  • tables/markers_top.csv
  • tables/mast_results.csv
  • tables/metadata.csv
  • tables/pseudobulk_summary.csv
  • figures/marker_dotplot.png
  • figures/pseudobulk_group_summary.png
  • figures/r_de_heatmap.png
  • figures/r_de_manhattan.png
  • figures/r_de_volcano.png
  • figures/r_feature_cor.png
  • figures/r_feature_violin.png
  • figures/rank_genes_groups.png
  • input.h5ad
  • processed.h5ad
  • report.md
  • result.json
  • Processed AnnData (saves_h5ad)

Flow

  1. Load the AnnData and inspect which matrix is in X (normalized vs raw).
  2. Validate the requested method's matrix contract — fail fast on mismatch.
  3. For exploratory paths: run Scanpy rank_genes_groups and export marker dotplot + rank summary.
  4. For mast: hand the log-normalized matrix to the R MAST bridge.
  5. For deseq2_r: pseudobulk-aggregate by sample_key × celltype_key, drop bins under --pseudobulk-min-cells / --pseudobulk-min-counts, run R DESeq2.
  6. Render direct figures (and R-enhanced ones if --r-enhanced).
  7. Write processed.h5ad, tables, figure_data/manifest.json, report.md, result.json, and reproducibility script.

Read the full file on GitHub · 123 lines

Files

What ships with it

8 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. 4d ago First seen · 123 lines · 51 tokens per session scan A 4443e57bc72c

Subscribe to this mod's changes

sc-de is a skill published in the GitHub repository TianGzlab/OmicsClaw (160 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 51 tokens to every session and 1,593 once invoked, about $0.0003 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 2026-09-03.

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