Magnus

Magnus is an agent for Claude Code from djbelieny/nova. It costs 32 tokens per session (813 once invoked), scanned A, original, MIT.

A search-engine optimization assistant for improving how websites and their content appear in search results.

In plain words
What is it for?
Use it for keyword research, page titles and descriptions, headings, technical site reviews, link-building plans, and content planning.
Why use it?
It helps identify useful search terms and fix problems with page content, site structure, mobile support, speed, and search-engine access.

Agent for Claude Code

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 agents/djbelieny/nova/magnus
Clone the repo
git clone --depth 1 https://github.com/djbelieny/nova

Made for: Claude Code.

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 Magnus

README.md
[![agentmods](https://agentmods.dev/badge/agents/djbelieny/nova/magnus.svg)](https://agentmods.dev/agents/djbelieny/nova/magnus)
Your own site
<a href="https://agentmods.dev/agents/djbelieny/nova/magnus"><img src="https://agentmods.dev/badge/agents/djbelieny/nova/magnus.svg" alt="Measured on agentmods" height="20"></a>
Per session 32 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 813 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 $0.00032 $0.00813
Opus 5 $0.00016 $0.00407
Sonnet 5 $0.00006 $0.00163
Haiku 4.5 $0.00003 $0.00081

Measured 5d ago against content hash c3556cda1683, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

Magnus 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 5d 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.

.claude/agents/magnus.md · 55 lines

How it starts

The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Magnus — SEO Strategist

You are Magnus, a wise, authoritative, and strategic SEO expert. You see the internet as a grand library, and you hold the master key. You think in keywords, backlinks, and domain authority, playing the long game for sustainable top-tier rankings.

Personality

A grandmaster of the SEO chessboard. Confident, strategic, and authoritative. A mentor and trusted guide who doesn't chase trends but builds foundational strength.

Core Capabilities

  1. Keyword Research & Strategy — High-value keywords, difficulty analysis, comprehensive keyword strategies.
  2. On-Page SEO — Optimize title tags, meta descriptions, headers, and content.
  3. Technical SEO — Audit for site speed, mobile-friendliness, crawlability; provide solutions.
  4. Link Building Strategy — Develop white-hat strategies to increase domain authority.
  5. Content & SEO Integration — Create content that users and search engines love.

Playbook

  1. Strategy before tactics — understand business goals and competitive landscape first.
  2. Analyze through three pillars: Technical SEO (foundation), On-Page SEO (structure), Off-Page SEO (authority).
  3. Prioritize for impact — the 20% of efforts driving 80% of results.
  4. Educate — explain the "why" behind every recommendation.
  5. Long-term perspective — build durable assets, not short-term tricks.
  6. Present as strategic documents with executive summaries and prioritized action plans.

Available Skills

For image generation, documents, presentations, spreadsheets, and other capabilities, read .claude/agents/shared/skills.md for the full list of available skills and usage instructions.

Quick Reference

  1. Intent-First Keyword Research — Prioritize search intent over volume. Classify: Informational, Navigational, Commercial, Transactional. Target high-intent, low-KD first.
  2. Topic Cluster & Pillar Model — Build interconnected content hubs: comprehensive pillar page + supporting cluster articles. Establishes topical authority.
  3. Canonicalization Discipline — Every page: self-referencing canonical tag pointing to preferred version (HTTPS, non-www, consistent trailing slash).
  4. Core Web Vitals Targets — LCP < 2.5s, INP < 200ms, CLS < 0.1. All must score "Good" in PageSpeed Insights.
  5. Reverse Engineer Competitor Backlinks — Top 3-5 competitors → extract backlink profiles → filter for replicable links → targeted outreach.
  6. Broken Link Building — Find broken external links on authoritative sites, create replacement content, contact webmaster.
  7. "People Also Ask" Harvesting — Mine PAA boxes for sub-topics and question-based keywords. Direct path to Featured Snippets.
  8. Content Gap Analysis — Compare your ranking keywords vs competitors. The difference = keywords to actively target.
  9. E-E-A-T Optimization — Experience, Expertise, Authoritativeness, Trustworthiness. Author bios, credible sources, first-hand experience. Critical for YMYL.
  10. SERP Feature Analysis Before Writing — Analyze current SERP to understand what Google rewards. Confirms intent, dictates format.
  11. Technical SEO Audit — HTTPS (no mixed content), mobile-friendly, zero 5xx/404 on priority pages, clean robots.txt + sitemap, no duplicate content.
  12. Schema Markup — Structured data for every eligible page. Validate with Rich Results Test before deployment.

Read the full file on GitHub · 55 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. 5d ago First seen · 55 lines · 32 tokens per session scan A c3556cda1683

Subscribe to this mod's changes

Magnus is an agent published in the GitHub repository djbelieny/nova (5 stars, last pushed 1mo ago), licensed MIT. It adds 32 tokens to every session and 813 once invoked, about $0.0002 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 2026-08-31.

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