A guide to improving website popups, modals, slide-ins, and announcement banners so they collect leads or show notices without harming the visitor experience. It covers timing, exit intent, mobile layouts, cookie consent, and testing.

Use it to plan lead-capture forms, exit-intent messages, cookie notices, announcements, and conversion tests. It helps choose triggers, write the message, set display limits, and track results.

It helps reduce intrusive overlays, poor mobile behavior, and badly timed requests. It also explains how to limit repeated displays and measure whether a popup achieves its goal.

popup-cro — Skill for Codex by san-npm

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 san-npm/skills-ws --skill popup-cro

Clone the repo

git clone --depth 1 https://github.com/san-npm/skills-ws

Made for: 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/san-npm/skills-ws/popup-cro/github.svg)](https://agentmods.dev/skills/san-npm/skills-ws/popup-cro)

Your own site

<a href="https://agentmods.dev/skills/san-npm/skills-ws/popup-cro"><img src="https://agentmods.dev/badge/skills/san-npm/skills-ws/popup-cro/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/san-npm/skills-ws/popup-cro"><img src="https://agentmods.dev/badge/skills/san-npm/skills-ws/popup-cro.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 57 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 544 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	$0.00057	$0.00544
Opus 5	$0.00028	$0.00272
Sonnet 5	$0.00011	$0.00109
Haiku 4.5	$0.00006	$0.00054

Measured 12d ago against content hash 3c7e6ee1a98e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

popup-cro 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 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.

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.

skills/popup-cro/SKILL.md · 27 lines

How it starts

The opening of the file, as written. The whole thing — 27 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Reference guide

Read only the references needed for the current request:

When to Use This Skill: references/when-to-use-this-skill.md
Popup Types & When to Use Each: references/popup-types-when-to-use-each.md
Exit Intent — Mechanics & Implementation: references/exit-intent-mechanics-implementation.md
Trigger Timing Optimization: references/trigger-timing-optimization.md
Frequency Capping Strategy: references/frequency-capping-strategy.md
Mobile Popup Rules (Google Guidelines): references/mobile-popup-rules-google-guidelines.md
Lead Magnet Popup Templates (12): references/lead-magnet-popup-templates-12.md
Announcement Banners: references/announcement-banners.md
Cookie Consent & Privacy Compliance (2026): references/cookie-consent-privacy-compliance-2026.md
A/B Testing Popups: references/a-b-testing-popups.md
Segmented Popups by Traffic Source: references/segmented-popups-by-traffic-source.md
Popup Copy Formulas: references/popup-copy-formulas.md
Design Patterns: references/design-patterns.md
Analytics & Measurement: references/analytics-measurement.md
Common Mistakes: references/common-mistakes.md
Quick-Start Implementation: references/quick-start-implementation.md

Read the full file on GitHub · 27 lines

Files

What ships with it

17 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.

12d ago First seen · 27 lines · 57 tokens per session scan A 3c7e6ee1a98e

Subscribe to this mod's changes

popup-cro is a skill published in the GitHub repository san-npm/skills-ws (2 stars, last pushed 5d ago), licensed MIT. It adds 57 tokens to every session and 544 once invoked, about $0.0003 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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