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 N-O-P-E/nope-marketplace --skill gtm-workflowgit clone --depth 1 https://github.com/N-O-P-E/nope-marketplaceWrote 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/n-o-p-e/nope-marketplace/gtm-workflow)<a href="https://agentmods.dev/skills/n-o-p-e/nope-marketplace/gtm-workflow"><img src="https://agentmods.dev/badge/skills/n-o-p-e/nope-marketplace/gtm-workflow/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/n-o-p-e/nope-marketplace/gtm-workflow"><img src="https://agentmods.dev/badge/skills/n-o-p-e/nope-marketplace/gtm-workflow.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 | $0.00101 | $0.01777 |
| Opus 5 | $0.00051 | $0.00889 |
| Sonnet 5 | $0.00020 | $0.00355 |
| Haiku 4.5 | $0.00010 | $0.00178 |
Grade A, and why
gtm-workflow 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.
How it starts
The opening of the file, as written. The whole thing — 135 lines — stays where its author put it; the contents beside it link to each section on GitHub.
gtm-workflow
Drive Google Tag Manager end-to-end through a real Chrome via chrome-devtools-mcp: inventory, verify, edit, preview, publish.
First principles
- Reads before writes. Always inventory the container before proposing changes — tags the user "forgot existed" are common.
- Workspaces stage; Publish ships. Work in the GTM draft workspace. Nothing goes live until the explicit Publish step.
- Preview before Publish. Use Tag Assistant to confirm tags fire on the real site before pushing to production.
- Events come from two places. A tag fires because of (a) a dataLayer
pushfrom your site code or (b) an auto-tracked DOM event (click, scroll, visibility). Diagnose which source is missing before assuming the tag is broken. - Every publish gets a version name and description. Future-you needs to roll back.
The loop
Inventory → Instrument → Verify → (optionally) Modify → Preview → Publish
For any GTM task, identify which phase you're starting in:
- "What's set up?" → Inventory only. See references/inspect.md.
- "Is X firing correctly?" → Instrument + Verify. See references/instrument.md.
- "Add X / fix trigger on Y" → Modify (+ Inventory first to know what exists). See references/modify.md.
- "Ship today's changes" → Preview + Publish. See references/preview.md and references/publish.md.
Phase 1 — Connect
Before any other work:
- Confirm the user has chrome-devtools-mcp available. Invoke
list_pages. If it errors withbrowser already running, follow references/troubleshooting.md. - Navigate to
https://tagmanager.google.com/#/home. - Check auth:
evaluate_scriptfordocument.body.innerText. If the page shows account listings, user is signed in. If it redirects toaccounts.google.com, the user needs to sign in themselves — show them the tab and wait. - Read the account list. Ask the user which container they want if there's more than one. Each container row is a link to
/container/accounts/<account-id>/containers/<container-id>— grab the real IDs from the href, never guess.
What ships with it
8 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.
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 · 135 lines · 101 tokens per session scan A 2de45dfbb7fc
gtm-workflow is a skill published in the GitHub repository N-O-P-E/nope-marketplace (9 stars, last pushed 4mo ago), licensed MIT. It adds 101 tokens to every session and 1,777 once invoked, about $0.0005 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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