What is aeo-cannibalization-detector?

A checker for finding when several pages from the same website compete to be cited for the same AI prompt. A citation is a link an AI assistant includes as supporting evidence.

Use it to test prompts repeatedly, identify competing URLs, rate the problem as low, medium, or high, and decide whether pages should be combined or made more distinct.

It reveals when a website’s own pages split their chances of being cited instead of one clear page building stronger visibility.

aeo-cannibalization-detector — Skill by psyduckler/aeo-skills

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 psyduckler/aeo-skills --skill aeo-cannibalization-detector

Clone the repo

git clone --depth 1 https://github.com/psyduckler/aeo-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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/psyduckler/aeo-skills/aeo-cannibalization-detector/github.svg)](https://agentmods.dev/skills/psyduckler/aeo-skills/aeo-cannibalization-detector)

Your own site

<a href="https://agentmods.dev/skills/psyduckler/aeo-skills/aeo-cannibalization-detector"><img src="https://agentmods.dev/badge/skills/psyduckler/aeo-skills/aeo-cannibalization-detector/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/psyduckler/aeo-skills/aeo-cannibalization-detector"><img src="https://agentmods.dev/badge/skills/psyduckler/aeo-skills/aeo-cannibalization-detector.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 113 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,638 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. 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.

Model	Per session	Once invoked
Fable 5.1	$0.00113	$0.01638
Opus 5.5	$0.00045	$0.00655
Sonnet 5.5	$0.00023	$0.00328
Haiku 4.5	$0.00011	$0.00164

Measured 2mo ago against content hash 93947bae68a9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

aeo-cannibalization-detector 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 2mo ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/_shared.py, scripts/detect.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.

aeo-cannibalization-detector/SKILL.md · 157 lines

How it starts

The opening of the file, as written. The whole thing — 157 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AEO Cannibalization Detector

Source: github.com/psyduckler/aeo-skills Part of: AEO Skills Suite

Detect when your own pages compete against each other for the same slots in Gemini's candidate set.

Background

Influence over AI answers happens at retrieval, not inside the model. When Gemini searches the web to answer a prompt, it builds a candidate set of pages to cite. If two of your own pages both enter that candidate set for the same prompt, you're competing against yourself — Gemini alternates between citing page A and page B, diluting the citation strength of both.

This matters because influence compounds through repeated inclusion in the recurring retrieval set. A page that gets cited 90% of the time is building authority. Two pages that each get cited 40% are neither building authority. In a search-first system like Gemini, where every response triggers web retrieval, having a single strong page in the candidate set beats splitting your authority across competing pages.

Defaults

Model: gemini-3-flash-preview — the same model powering Google AI Overviews
Samples: 20 runs per prompt — enough to detect citation splits

Requirements

Gemini API key (free from aistudio.google.com) — set as GEMINI_API_KEY env var
Python 3.9+
No pip dependencies (stdlib only)

Usage

# Check two prompts for cannibalization
GEMINI_API_KEY="$GEMINI_API_KEY" python3 scripts/detect.py --domain acme.com \
    "best content optimization tools" \
    "SEO content software"

# Load prompts from a file
GEMINI_API_KEY="$GEMINI_API_KEY" python3 scripts/detect.py --domain acme.com --prompts-file prompts.txt

# Both positional prompts and file, JSON output
GEMINI_API_KEY="$GEMINI_API_KEY" python3 scripts/detect.py --domain acme.com \
    "content optimization" \
    --prompts-file more-prompts.txt \
    --output json

# Higher confidence with more runs
GEMINI_API_KEY="$GEMINI_API_KEY" python3 scripts/detect.py --domain acme.com \
    "best SEO tools" --runs 30

Read the full file on GitHub · 157 lines

Files

What ships with it

2 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.

2mo ago First seen · 157 lines · 113 tokens per session scan A 93947bae68a9

Subscribe to this mod's changes

aeo-cannibalization-detector is a skill published in the GitHub repository psyduckler/aeo-skills (13 stars, last pushed 5mo ago), licensed MIT. It adds 113 tokens to every session and 1,638 once invoked, about $0.0005 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.

Marketing and SEO

aeo-cannibalization-detector next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
aeo-cannibalization-detectorpsyduckler/aeo-skills	Skill	13	5mo ago	MIT	A	113	Claude Code, Codex
imagegenopenai/codex	Skill	133k	yesterday	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	yesterday	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	4d ago	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	313k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	103	Claude Code