Claude SEO is an open-source Claude Code plugin that runs specialized agents and skills to audit websites across technical SEO, content quality, structured data, AI-search optimization, local and e-commerce SEO, and international SEO. SEO practitioners use it to produce prioritized recommendations based on primary-source guidance, with optional extensions for external data and crawling.
Borrowing it
Nothing to install: this file belongs to AgriciDaniel/claude-seo. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/AgriciDaniel/claude-seo/main/AGENTS.mdgit clone --depth 1 https://github.com/AgriciDaniel/claude-seoWrote 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.
[](https://agentmods.dev/instructions/agricidaniel/claude-seo/agents-md)<a href="https://agentmods.dev/instructions/agricidaniel/claude-seo/agents-md"><img src="https://agentmods.dev/badge/instructions/agricidaniel/claude-seo/agents-md/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.
<a href="https://agentmods.dev/instructions/agricidaniel/claude-seo/agents-md"><img src="https://agentmods.dev/badge/instructions/agricidaniel/claude-seo/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.02398 | $0.02398 |
| Opus 5.5 | $0.00959 | $0.00959 |
| Sonnet 5.5 | $0.00480 | $0.00480 |
| Haiku 4.5 | $0.00240 | $0.00240 |
Grade A, and why
claude-seo AGENTS.md 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.
How it starts
The opening of the file, as written. The whole thing — 187 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Claude SEO: Multi-Platform Agent Instructions
For Cursor, Cursor Cloud Agents, Google Antigravity, Gemini CLI, Grok Build, OpenAI Codex CLI, Cline, Aider, and any other agent harness that reads project-root agent instructions.
Claude Code users: see
CLAUDE.mdinstead.
Cross-platform portability (v2.0.0)
Every skill in skills/*/SKILL.md is authored to a portable subset of the
Claude Code skill spec. Validate compatibility with your harness via:
./scripts/claude-seo run portability_check.py
The check confirms each SKILL.md has the minimum frontmatter every harness
expects (name, description, optional model, optional tools) and warns
on Claude-Code-specific features (maxTurns, multi-line tool list with
descriptive comments) that other harnesses may ignore but do not reject.
Per-harness notes
| Harness | How to load claude-seo |
|---|---|
| Cursor | Symlink or copy skills/ and agents/ into .cursor/rules/. Commands are invoked as text prompts; the harness reads SKILL.md body as system context. |
| Cursor Cloud Agents | Push the repo; Cloud Agents read AGENTS.md automatically at session start. |
| Google Antigravity | Point the workspace at this repo root; Antigravity reads AGENTS.md first, falls back to skills/. |
| Gemini CLI | gemini init in this repo loads AGENTS.md. Skills are activated via activate_skill <name> in conversation. |
| Grok Build | Open this repository in Grok Build. It reads AGENTS.md and Claude Code compatible plugins and skills without a separate layout. Use grok inspect to verify discovery. See the official compatibility guide. |
| OpenAI Codex CLI | Reads AGENTS.md from project root. Bash tools work as documented; some Claude-specific tool names (Read/Write/Edit) are aliased to Codex equivalents transparently. |
| Cline | Loads AGENTS.md from project root. Skills appear as system messages; subagent delegation falls back to in-context expansion. |
| Aider | Reads AGENTS.md if present; otherwise falls back to README. Aider does not support sub-agent dispatch; the seo-* skills run inline. |
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.
- 1mo ago Changed · +2 lines · +51 tokens per session 7f5d4b9ad77a
- 1mo ago Changed 3febdc0d049c
- 1mo ago First seen · 185 lines · 2,347 tokens per session scan A 3f1510c4dcf3
claude-seo AGENTS.md is an instructions file published in the GitHub repository AgriciDaniel/claude-seo (19,878 stars, last pushed 2d ago), licensed MIT. It adds 2,398 tokens to every session, about $0.0096 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).