gnomad-database

gnomad-database is a skill for Claude Code, Codex from google-deepmind/science-skills. It costs 92 tokens per session (764 once invoked), scanned A, original, Apache-2.0.

A query skill for gnomAD, the Genome Aggregation Database, which collects genetic-variant data from large groups of people. It retrieves variant frequencies, gene constraint measures, variants in genes or regions, and structural variants.

In plain words
What is it for?
Use it to find global or ancestry-specific allele frequencies, homozygote counts, loss-of-function constraint measures such as pLI and LOEUF, regional or gene variants, and structural variants.
Why use it?
It avoids manually searching the database and uses provided scripts that handle API rate limits. It helps put a genetic variant's rarity and possible biological significance into context.

Skill for Claude CodeCodex

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

About the project

Science Skills is a collection of add-ons that give AI agents structured instructions, scripts, and references for scientific research, including genomics, structural biology, cheminformatics, and literature search. Researchers use it to guide agents through specialized scientific tasks with information from databases and tools such as AlphaGenome, AFDB, and UniProt. The catalogue entries are individual skills from this collection.

google-deepmind/science-skills · 2,845 stars · on GitHub · antigravity.google

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/google-deepmind/science-skills/gnomad_database
Any agent
npx skills add google-deepmind/science-skills --skill gnomad_database
Clone the repo
git clone --depth 1 https://github.com/google-deepmind/science-skills

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 gnomad-database

README.md
[![agentmods](https://agentmods.dev/badge/skills/google-deepmind/science-skills/gnomad_database.svg)](https://agentmods.dev/skills/google-deepmind/science-skills/gnomad_database)
Your own site
<a href="https://agentmods.dev/skills/google-deepmind/science-skills/gnomad_database"><img src="https://agentmods.dev/badge/skills/google-deepmind/science-skills/gnomad_database.svg" alt="Measured on agentmods" height="20"></a>
Per session 92 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 764 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 5.1 $0.00092 $0.00764
Opus 5 $0.00046 $0.00382
Sonnet 5 $0.00018 $0.00153
Haiku 4.5 $0.00009 $0.00076

Measured 7d ago against content hash f2082c83ddca, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

gnomad-database 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 7d ago.

The scan reads SKILL.md. This mod also ships 3 executable files (scripts/get_gene_constraint.py, scripts/get_variant_frequency.py, scripts/search_variants.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/gnomad_database/SKILL.md · 74 lines

How it starts

The opening of the file, as written. The whole thing — 74 lines — stays where its author put it; the contents beside it link to each section on GitHub.

gnomAD Database

Prerequisites

  1. uv: Read the uv skill and follow its Setup instructions to ensure uv is installed and on PATH.
  2. User Notification: If .licenses/gnomad_database_LICENSE.txt does not already exist in the workspace root directory then (1) prominently notify the user to check the terms at https://gnomad.broadinstitute.org/policies and https://gnomad.broadinstitute.org/data#api, then (2) create the file recording the notification text and timestamp.

Core Rules

  • Use the Wrapper: ALWAYS execute the provided helper scripts to query the database rather than accessing the database directly. The scripts automatically enforce the gnomAD API rate limits gracefully.
  • Notification: If this skill is used, ensure this is mentioned in the output.

Utility Scripts

All scripts are located in the scripts/ subdirectory of this skill's installation directory. When running them, use the full absolute path to the script (e.g. /path/to/gnomad_database/scripts/get_variant_frequency.py).

1. Variant Frequency. Retrieves global and ancestry-specific allele frequencies, homozygote counts, and Grpmax Filtering AF (faf95/faf99) for exome, genome, and total (exome+genome combined) data. The filtering allele frequency (FAF) is the maximum credible genetic ancestry group AF (lower bound of the 95% or 99% CI). Variant ID format must be chrom-pos-ref-alt (e.g., 1-55516888-G-GA). Alternately, you may provide an rsID.

# By variant ID:
uv run scripts/get_variant_frequency.py --variant_id {variant_id} [--dataset {dataset}] --output variant_frequency.json

# By rsID (e.g., rs1800562):
uv run scripts/get_variant_frequency.py --rsid {rsid} [--dataset {dataset}] --output variant_frequency.json

2. Gene Constraint. Retrieves constraint metrics for a gene. The response will explicitly contain pli, and the LOEUF score is represented by oe_lof_upper.

uv run scripts/get_gene_constraint.py --gene {gene_symbol} --output {gene_symbol}_constraint.json

Read the full file on GitHub · 74 lines

Files

What ships with it

4 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. 7d ago First seen · 74 lines · 92 tokens per session scan A f2082c83ddca

Subscribe to this mod's changes

gnomad-database is a skill published in the GitHub repository google-deepmind/science-skills (2,845 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 92 tokens to every session and 764 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 2026-08-30.

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