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.
npx skills add swan-gtm/gtm-skills --skill meta-third-party-conversion-trackinggit clone --depth 1 https://github.com/swan-gtm/gtm-skillsWrote 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/skills/swan-gtm/gtm-skills/meta-third-party-conversion-tracking)<a href="https://agentmods.dev/skills/swan-gtm/gtm-skills/meta-third-party-conversion-tracking"><img src="https://agentmods.dev/badge/skills/swan-gtm/gtm-skills/meta-third-party-conversion-tracking/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/skills/swan-gtm/gtm-skills/meta-third-party-conversion-tracking"><img src="https://agentmods.dev/badge/skills/swan-gtm/gtm-skills/meta-third-party-conversion-tracking.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00034 | $0.01008 |
| Opus 5.5 | $0.00014 | $0.00403 |
| Sonnet 5.5 | $0.00007 | $0.00202 |
| Haiku 4.5 | $0.00003 | $0.00101 |
Grade A, and why
meta-third-party-conversion-tracking 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 — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Meta Ads - Third-Party / Off-Domain Conversion Tracking (Webinars & Events)
When the conversion (e.g. webinar signup, event registration) happens on a third-party platform (Luma, Hopin, etc.) instead of on your website, use this for best-practice setup. Applies to anyone running Meta ads to a webinar or event where signup completes off-domain.
The Problem
- User lands on your site (e.g. webinar LP with UTM).
- User clicks "Sign up" → goes to third-party platform (e.g. Luma) to complete registration.
- Conversion happens off your domain. If your pixel is only on your site, Meta never sees the signup unless you track it on your domain or on the platform.
Best Practice: Two Decisions
1. Where to track the conversion (pixel in platform vs thank-you page)
| Option | When to use | What to do |
|---|---|---|
| Pixel in the platform | Platform supports Meta pixel (e.g. Luma Plus → Calendar → Settings → Options). You have or will get the required plan. | Add your Meta pixel in the platform. Platform sends e.g. CompleteRegistration when user registers. Add the platform's domain (e.g. luma.com, lu.ma) to your Meta pixel Traffic permissions (allow list). |
| Thank-you page on your site | Platform doesn't support a pixel, or you don't have the plan. Platform can redirect after registration to a URL you control. | Set post-registration redirect to a thank-you page on your domain. Fire Lead or CompleteRegistration on that page. Optimize for that event. |
Recommendation: Pixel in the platform is best when available (one setup, real conversion). Thank-you page is the fallback when the platform can't fire the pixel but can redirect.
2. Passing UTM to the signup link
- The platform will not automatically see the UTM from the page the user was on when they clicked "Sign up."
- Best practice: When the user clicks the signup/register button, the link to the third-party site should include the same UTM parameters (e.g. from the current page URL).
- How: Build the signup link dynamically: read the current URL query string (e.g.
window.location.search) and append it to the platform's registration URL. Example:https://platform.com/event/xyz→https://platform.com/event/xyz?utm_source=linkedin&utm_medium=paid-social&utm_campaign=... - Ensures attribution and platform-side reporting stay correct.
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 First seen · 73 lines · 34 tokens per session scan A c93aef6f4e42
meta-third-party-conversion-tracking is a skill published in the GitHub repository swan-gtm/gtm-skills (221 stars, last pushed 8d ago), licensed MIT. It adds 34 tokens to every session and 1,008 once invoked, about $0.0001 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 2026-09-03.
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