ensembl-vep-variant-annotator

ensembl-vep-variant-annotator is a skill for Claude Code, Codex from YuliaNuzhnenko/bioinformatics-agent-skills. It costs 44 tokens per session (490 once invoked), scanned A, original, MIT.

A workflow for interpreting genetic variants in multi-sample VCF files, which are standard files for recording DNA differences. It uses Ensembl VEP, ClinVar, and related sources to annotate variants, assess pathogenicity, and connect driver mutations with FDA-approved targeted drugs.

In plain words
What is it for?
Parsing VCF files, querying variant annotations, filtering ClinVar ratings, and mapping relevant mutations to targeted medicines.
Why use it?
It reduces the manual work of looking up variants across several biomedical databases.

Skill for Claude CodeCodex

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

Good fit Parsing VCF files, querying variant annotations, filtering ClinVar ratings, and mapping relevant mutations to targeted medicines.

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Install with agentmods
npx agentmods add skills/yulianuzhnenko/bioinformatics-agent-skills/ensembl-vep-variant-annotator
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 YuliaNuzhnenko/bioinformatics-agent-skills --skill ensembl-vep-variant-annotator
Clone the repo
git clone --depth 1 https://github.com/YuliaNuzhnenko/bioinformatics-agent-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 ensembl-vep-variant-annotator

README.md
[![agentmods](https://agentmods.dev/badge/skills/yulianuzhnenko/bioinformatics-agent-skills/ensembl-vep-variant-annotator/github.svg)](https://agentmods.dev/skills/yulianuzhnenko/bioinformatics-agent-skills/ensembl-vep-variant-annotator)
Your own site
<a href="https://agentmods.dev/skills/yulianuzhnenko/bioinformatics-agent-skills/ensembl-vep-variant-annotator"><img src="https://agentmods.dev/badge/skills/yulianuzhnenko/bioinformatics-agent-skills/ensembl-vep-variant-annotator/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 ensembl-vep-variant-annotator

Your own site · 80×15
<a href="https://agentmods.dev/skills/yulianuzhnenko/bioinformatics-agent-skills/ensembl-vep-variant-annotator"><img src="https://agentmods.dev/badge/skills/yulianuzhnenko/bioinformatics-agent-skills/ensembl-vep-variant-annotator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 490 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
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 $0.00044 $0.00490
Opus 5 $0.00022 $0.00245
Sonnet 5 $0.00009 $0.00098
Haiku 4.5 $0.00004 $0.00049

Measured 12d ago against content hash 045738c1258f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

ensembl-vep-variant-annotator scanned grade A with 1 finding 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 12d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

r = requests.get(url)
skills/ensembl-vep-variant-annotator/SKILL.md · 59 lines

What it actually says

Agent Skill: Clinical VCF Variant Prioritization & VEP Skill

Domain Version

📌 Description

Parses multi-sample VCF files, queries Ensembl VEP REST API, filters ClinVar pathogenicity ratings, and maps driver mutations to FDA targeted drugs.


🤖 Agent Execution Protocol

When an AI Agent is tasked with ensembl-vep-variant-annotator:

  1. Input Validation: Verify that the required input files or coordinates are supplied.
  2. Environment Check: Ensure dependencies (PyVCF, Ensembl VEP API, ClinVar, Open Targets) are installed.
  3. Execution: Run the protocol pipeline snippet below.
  4. Output Generation: Produce actionable Markdown/JSON summaries with publication figures.

💻 Protocol Code Snippet

import requests

def query_vep_variant(chrom, pos, ref, alt):
    url = f"https://rest.ensembl.org/vep/human/region/{chrom}:{pos}-{pos}:1/{alt}?content-type=application/json"
    r = requests.get(url)
    return r.json() if r.status_code == 200 else {}


📥 Input & Output Specifications

Input Contract

  • Target Files: Valid input data matching domain formats.
  • Parameters: Quality thresholds and cutoffs.

Output Contract

  • Results Table: Structured summary dataframe or matrix.
  • Visualization: Rendered SVG/PNG figures.

📄 License

Distributed under the MIT License. See LICENSE for details.

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. 12d ago First seen · 59 lines · 44 tokens per session scan A 045738c1258f

Subscribe to this mod's changes

ensembl-vep-variant-annotator is a skill published in the GitHub repository YuliaNuzhnenko/bioinformatics-agent-skills (9 stars, last pushed 1mo ago), licensed MIT. It adds 44 tokens to every session and 490 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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