ancestry

ancestry is a skill for Claude Code, Codex from exon-research/genomi. It costs 37 tokens per session (1,877 once invoked), scanned A, original, Apache-2.0.

A local ancestry-reference workflow that compares genome data with samples from the 1000 Genomes Project, a public international genetics reference dataset. It uses PCA, a method for showing broad genetic similarity in a reduced-dimensional space.

In plain words
What is it for?
Use it to check which public reference samples a genome resembles, review marker-overlap quality, and compare data using GRCh37 or GRCh38 genome builds.
Why use it?
It provides population-reference context without presenting the result as a precise ethnicity, race, or identity prediction.

Skill for Claude CodeCodex

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

Good fit Use it to check which public reference samples a genome resembles, review marker-overlap quality, and compare data using GRCh37 or GRCh38 genome builds.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/exon-research/genomi/ancestry
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 exon-research/genomi --skill ancestry
Clone the repo
git clone --depth 1 https://github.com/exon-research/genomi

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 ancestry

README.md
[![agentmods](https://agentmods.dev/badge/skills/exon-research/genomi/ancestry/github.svg)](https://agentmods.dev/skills/exon-research/genomi/ancestry)
Your own site
<a href="https://agentmods.dev/skills/exon-research/genomi/ancestry"><img src="https://agentmods.dev/badge/skills/exon-research/genomi/ancestry/github.svg" alt="Measured on agentmods" height="20"></a>

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 ancestry

Your own site · 80×15
<a href="https://agentmods.dev/skills/exon-research/genomi/ancestry"><img src="https://agentmods.dev/badge/skills/exon-research/genomi/ancestry.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 37 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,877 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 $0.00037 $0.01877
Opus 5.5 $0.00015 $0.00751
Sonnet 5.5 $0.00007 $0.00375
Haiku 4.5 $0.00004 $0.00188

Measured 1mo ago against content hash 088cd965341d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ancestry 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.

skills/ancestry/SKILL.md · 184 lines

How it starts

The opening of the file, as written. The whole thing — 184 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Ancestry Reference-Panel Context

Use this skill when the user asks about ancestry, population context, PCA projection, reference-panel similarity, or which public reference samples their genome is closest to.

Contract

  • This capability is a local reference-panel workflow, not an ethnicity or race predictor.
  • Private tools require current-session Active Genome Index access approval or a genome source path supplied in the current chat.
  • Public metadata tools do not read an Active Genome Index.
  • Private genotype data stays local. Do not upload sample genotypes to external APIs or URLs.
  • The MVP supports GRCh38 and GRCh37. If genome_build is omitted, the tool default is GRCh38 unless an approved Active Genome Index provides another build; the returned defaults_applied records that default.
  • Labels are 1000 Genomes reference-panel labels, not ethnicity, nationality, race, tribe, caste, religion, or personal identity.
  • Output is qualitative reference-panel similarity in PCA space. Do not produce component percentages, admixture proportions, haplogroups, local ancestry, ancestry dates, or relative matching.

Convention: See skills/conventions/context-routing.md. Convention: See skills/conventions/evidence-quality.md. Convention: See skills/_output-rules.md.

First Actions

  1. Use ancestry.list_reference_panels to check whether the matching-build 1000 Genomes 30x panel is installed and to inspect source URLs and label definitions.
  2. Use ancestry.build_source_context when the user asks what the panel means or when you need explicit label and method boundaries before answering.
  3. For sample-specific questions, use genomi.describe_context only when the chat asks about current Active Genome Index context or already mentioned a genome source. If the user supplied a genome source path, that is approval to read it for this session.
  4. Use ancestry.estimate_population_context as the default sample-specific entry point. It runs overlap QC and PCA projection when enough markers are usable.
  5. Use ancestry.check_sample_overlap when you only need QC readiness, and ancestry.project_pca when the host agent needs raw PCA coordinates and nearest reference-neighbor distances.

Read the full file on GitHub · 184 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 · 184 lines · 37 tokens per session scan A 088cd965341d

Subscribe to this mod's changes

ancestry is a skill published in the GitHub repository exon-research/genomi (485 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 37 tokens to every session and 1,877 once invoked, about $0.0001 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 2026-08-30.

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