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mutagen

mutagen is a skill for Claude Code, Codex from VKirill/claude-lane-stack. It costs 262 tokens per session (5,377 once invoked), scanned A, original, MIT.

A reference skill for using Mutagen, with pinned versions for its API, Python, and Node.js, plus procedures for Yandex search and advertising data.

In plain words
What is it for?
Use it for Yandex keyword-volume research, competition checks, advertising bid estimates, keyword parsing, and search-results analysis. The description provides little information beyond these uses.
Why use it?
It gives the coding agent project-specific version requirements and instructions for retrieving search, competition, advertising, and results-page data.

Skill for Claude CodeCodex

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

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is Source of truth: [STACK_VERSIONS.md](../../STACK_VERSIONS.md) — verified 2026-08-24.

Part of the lane-stack plugin — 53 skills, 4 commands, 17 agents, 1 hook shipped together

not rated 115repo +1 today A scan SkillSpector: warn 262 tokens original MIT

Good fit Use it for Yandex keyword-volume research, competition checks, advertising bid estimates, keyword parsing, and search-results analysis. The description provides little information beyond these uses.

Compare 6 skills from other repositories ↓
View source ↗ VKirill/claude-lane-stack
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/VKirill/claude-lane-stack
agentmods
npx agentmods add skills/vkirill/claude-lane-stack/mutagen

Made for: Claude Code, Codex.

Or install lane-stack, the plugin that ships this one along with the rest of its 53 skills, 4 commands, 17 agents, 1 hook.

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 mutagen

README.md
[![agentmods](https://agentmods.dev/badge/skills/vkirill/claude-lane-stack/mutagen/github.svg)](https://agentmods.dev/skills/vkirill/claude-lane-stack/mutagen)
Your own site
<a href="https://agentmods.dev/skills/vkirill/claude-lane-stack/mutagen"><img src="https://agentmods.dev/badge/skills/vkirill/claude-lane-stack/mutagen/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 mutagen

Your own site · 80×15
<a href="https://agentmods.dev/skills/vkirill/claude-lane-stack/mutagen"><img src="https://agentmods.dev/badge/skills/vkirill/claude-lane-stack/mutagen.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 262 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,377 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 3 findings, up to medium

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 →

  • medium analysis-evasion · line 1
    Suspicious Unicode normalization or mixed-script content
    Fix: Review the flagged content for security risks. Ensure no credentials, secrets, or sensitive data are exposed.
  • medium Data Exfiltration · line 126
    Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.
    Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
  • medium Excessive Agency · line 215
    Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.
    Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
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 $0.00262 $0.05377
Opus 5 $0.00131 $0.02688
Sonnet 5 $0.00052 $0.01075
Haiku 4.5 $0.00026 $0.00538

Measured 3d ago against content hash cbdbcf8e0fa0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

mutagen 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 3d 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.

~0.30 RUB per phrase. Results are cached 30 days, so repeating the same phrase within the TTL costs nothing. **Before calling with a large list, verify your Mutagen balance** — use `mutagen.balance()` directly (curl or a
plugins/lane-stack/skills/seo-tools/mutagen/SKILL.md · 278 lines

How it starts

The opening of the file, as written. The whole thing — 278 lines — stays where its author put it; the contents beside it link to each section on GitHub.

🎯 Version Requirements (August 2026)

Primary pins:

  • Mutagen API: docs-only (stable JSON REST, no version path)
  • Python: 3.14.x
  • Node.js: 24.x (Active LTS)

Source of truth: STACK_VERSIONS.md — verified 2026-08-24

Usage

Loaded automatically when its description matches the active task. Read only the section you need, then follow the link to the relevant reference file for full detail.

Use this skill when

  • Сбор семантики под Яндекс — массовая проверка точной частотности через mutagen.parser.mass.new (wordstat_qso для "[!фраза]")
  • Проверка уровня конкуренции (strong) ключевых фраз через async mutagen.check_key.new + mutagen.check_key.get polling
  • Получение биdов Яндекс.Директа (direct.spec / direct.first / direct.garant) для оценки стоимости трафика
  • Парсинг левой колонки Вордстата — wordstat_key (до 2000 ключей, 10 страниц) или wordstat_key_50 (первые 200 с первой страницы)
  • SERP-анализ через mutagen.serp.report — конкуренты домена, упавшие/поднявшиеся фразы, хвосты, страницы домена, дополняющие фразы
  • Region-specific data — yandex_msk, yandex_spb, yandex_minsk, yandex_nsk, yandex_ekb, yandex_rostov, yandex_kazan, yandex_nn
  • Работа с проектами и claster_id — mutagen.progects() + mutagen.progect.keywords(progect_id) для кластеризации семантического ядра
  • Building a Python/Node.js client с polling, idempotency, balance pre-check, deduplication, retry с exp backoff

Do not use this skill when

  • Прямой парсинг Яндекс Wordstat без mutagen (own scraper, official Wordstat API) — use wordstat-api (cascade marker)
  • Desktop tool Key Collector — use key-collector (cascade marker)
  • Другие RU SEO-сервисы — Topvisor / Rush Analytics / SpyWords / Serpstat — different APIs, use their respective skills
  • Foreign SEO SaaS — Ahrefs / Semrush / Moz / SE Ranking — use respective skills; Mutagen is Yandex-only RU domestic
  • Google keyword data / Google Ads Keyword Planner — Mutagen returns ONLY Yandex data; for Google use different tooling
  • Using the parsed keywords downstream in scraping / content generation — that belongs to the runtime skill (httpx, nodejs, python)

Read the full file on GitHub · 278 lines

Files

What ships with it

19 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. 3d ago First seen · 278 lines · 262 tokens per session scan A cbdbcf8e0fa0

Subscribe to this mod's changes

mutagen is a skill published in the GitHub repository VKirill/claude-lane-stack (115 stars, last pushed today), licensed MIT. It adds 262 tokens to every session and 5,377 once invoked, about $0.0013 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 2026-09-05.

ClusteringMarketing and SEOResearchagentic-codingai-agentsai-codingautomationkeywordsmutagenruseoserpwordstatyandex
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