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 Zevenue/headless-gtm --skill headless-gtm-sharedgit clone --depth 1 https://github.com/Zevenue/headless-gtmWrote 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/zevenue/headless-gtm/headless-gtm-shared)<a href="https://agentmods.dev/skills/zevenue/headless-gtm/headless-gtm-shared"><img src="https://agentmods.dev/badge/skills/zevenue/headless-gtm/headless-gtm-shared/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/zevenue/headless-gtm/headless-gtm-shared"><img src="https://agentmods.dev/badge/skills/zevenue/headless-gtm/headless-gtm-shared.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 | $0.00090 | $0.00565 |
| Opus 5 | $0.00045 | $0.00282 |
| Sonnet 5 | $0.00018 | $0.00113 |
| Haiku 4.5 | $0.00009 | $0.00056 |
Grade A, and why
headless-gtm-shared 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 10d 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.
What it actually says
headless-gtm-shared - the chain's record contract and helpers
This folder is a library, not a skill. Nothing invokes it directly. It ships as
a skill folder for one reason: the SKILL.md marker is what makes skill
installers copy a directory, and every chain skill depends on this one.
What is in here
| File | What it is | Who uses it |
|---|---|---|
CONVENTIONS.md |
The chain contract: JSONL records, additive per-stage fields, the runs/<run-id>/ layout, deviation logging |
Every chain skill references it; read it before changing any output format |
common.py |
.env loading, the >$10 cost gate, output-dir resolution, run slugs, run metadata |
Imported by the chain scripts |
schema.py |
ProspectRecord construction and the CSV/JSON writers |
Imported by the discovery scripts |
requirements.txt |
The full dependency list for the chain, mirrored at the repo root | pip install |
If you are reading this because an import failed
A script exited with cannot find headless-gtm-shared/common.py. The skill was
copied out without this folder. Copy skills/headless-gtm-shared/ next to the
skill that failed, so the layout is:
<skills-dir>/
├── headless-gtm-shared/ <- this folder
├── 02-apify-maps-discover/
└── ...
The npx skills add installer picks this folder up on its own. Only a manual
single-folder copy can miss it.
Two rules worth knowing before you edit anything here
common.load_env()never overwrites an exported variable. A real shell export or a secrets manager always beats a.envon disk. The loader only fills in what is missing.common.resolve_out_dir()writes under the current working directory, not under the skill. An installed skill is a read-only package; client output belongs in the project you are working in.
What ships with it
4 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.
- 10d ago First seen · 50 lines · 90 tokens per session scan A 923e9512515d
headless-gtm-shared is a skill published in the GitHub repository Zevenue/headless-gtm (26 stars, last pushed 1mo ago), licensed MIT. It adds 90 tokens to every session and 565 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 2026-08-30.
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