methylation-region-genomic-context-assignment

methylation-region-genomic-context-assignment is a skill for Claude Code, Codex from HolobiomicsLab/asb-skill-collections. It costs 54 tokens per session (1,786 once invoked), scanned A, original, Apache-2.0.

An annotation step that places differentially methylated DNA bases and regions in genomic areas such as promoters, exons, introns, and intergenic regions, as well as CpG islands and shores. CpG islands are DNA areas rich in neighboring CpG sites; shores are nearby regions.

In plain words
What is it for?
Use it after finding statistically significant methylation changes. It produces overlap summaries showing whether changes are concentrated in promoters, gene bodies, CpG islands, or shores.
Why use it?
It turns a list of methylation changes into information about where those changes occur in relation to genes and DNA sequence features.

Skill for Claude CodeCodex

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

Good fit Use it after finding statistically significant methylation changes. It produces overlap summaries showing whether changes are concentrated in promoters, gene bodies, CpG islands, or shores.

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Install with agentmods
npx agentmods add skills/holobiomicslab/asb-skill-collections/methylation-region-genomic-context-assignment
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 HolobiomicsLab/asb-skill-collections --skill methylation-region-genomic-context-assignment
Clone the repo
git clone --depth 1 https://github.com/HolobiomicsLab/asb-skill-collections

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.

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README.md
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Your own site
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Per session 54 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,786 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 pass 7 Sept 2026
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 $0.00054 $0.01786
Opus 5 $0.00027 $0.00893
Sonnet 5 $0.00011 $0.00357
Haiku 4.5 $0.00005 $0.00179

Measured 9d ago against content hash 59857799b9a5, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

methylation-region-genomic-context-assignment 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 9d 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.

collections/epigenomics/v1/skills/methylation-region-genomic-context-assignment/SKILL.md · 106 lines

How it starts

The opening of the file, as written. The whole thing — 106 lines — stays where its author put it; the contents beside it link to each section on GitHub.

methylation-region-genomic-context-assignment

Summary

Assign differentially methylated bases and regions to genomic annotation features (promoters, exons, introns, intergenic regions) and CpG island contexts (CpG islands vs. shores) using overlap-based annotation functions. This skill quantifies the spatial distribution of methylation changes across functional and sequence-context categories.

When to use

After identifying differentially methylated bases or regions (via calculateDiffMeth() and getMethylDiff()), when you need to characterize WHERE these methylation changes occur relative to gene structure and CpG density landscapes. Use this skill to generate percentage-overlap tables that answer: Are hyper-methylated bases enriched in promoters or gene bodies? Do hyper-methylated regions cluster in CpG islands or shores?

When NOT to use

  • Input methylDiff object has not been filtered by q-value and methylation difference thresholds — apply getMethylDiff() first to define the set of differentially methylated bases.
  • Gene annotation or CpG island BED files are from a different genome build than the methylation data (e.g., mixing hg18 and hg19 coordinates) — coordinates will not match.
  • You need single-base-resolution methylation calls without overlap-based aggregation — use raw methylRawList or methylBase objects directly instead.

Inputs

  • methylDiff object (output from calculateDiffMeth() filtered by getMethylDiff())
  • RefSeq gene annotation BED file (e.g., refseq.hg18.bed.txt) containing promoter, exon, intron coordinates
  • CpG island annotation BED file (e.g., cpgi.hg18.bed.txt) with island and shore boundaries

Outputs

  • Percentage overlap table: differentially methylated bases classified by gene annotation feature (promoter/exon/intron/intergenic)
  • Percentage overlap table: differentially methylated bases classified by CpG context (island/shore)
  • Summary statistics table with row counts and proportions matching vignette reference format

Read the full file on GitHub · 106 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. 9d ago First seen · 106 lines · 54 tokens per session scan A 59857799b9a5

Subscribe to this mod's changes

methylation-region-genomic-context-assignment is a skill published in the GitHub repository HolobiomicsLab/asb-skill-collections (15 stars, last pushed yesterday), licensed Apache-2.0. It adds 54 tokens to every session and 1,786 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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