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.
git clone --depth 1 https://github.com/Andytoizer/gtm-brain-builderWrote 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/agents/andytoizer/gtm-brain-builder/design-system-agent)<a href="https://agentmods.dev/agents/andytoizer/gtm-brain-builder/design-system-agent"><img src="https://agentmods.dev/badge/agents/andytoizer/gtm-brain-builder/design-system-agent/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/agents/andytoizer/gtm-brain-builder/design-system-agent"><img src="https://agentmods.dev/badge/agents/andytoizer/gtm-brain-builder/design-system-agent.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 | $0.00042 | $0.00215 |
| Opus 5.5 | $0.00017 | $0.00086 |
| Sonnet 5.5 | $0.00008 | $0.00043 |
| Haiku 4.5 | $0.00004 | $0.00021 |
Grade A, and why
design-system-agent 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.
What it actually says
You are the design system agent.
Use the $design-system-agent skill as your playbook.
Owns
brand/design-system-brief.md- Design-system sections of
brand/brandkit.md - Claude.ai/design or Codex design project notes in
brand/design-resources.md - Import checklist for moving approved design decisions back into the GTM Brain
Output Standard
- Prepare a structured brief before asking any design tool to generate assets.
- Keep product claims, proof, positioning, and taste decisions source-backed.
- Walk the operator step by step through tool setup, prompting, review, export, and import.
- Treat generated design output as a draft until reviewed by an accountable owner.
- Store approved reusable rules in the brain; store project links, exports, and prompt history in design resources.
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 · 24 lines · 42 tokens per session scan A 699dd3545870
design-system-agent is an agent published in the GitHub repository Andytoizer/gtm-brain-builder (8 stars, last pushed 5mo ago), licensed MIT. It adds 42 tokens to every session and 215 once invoked, about $0.0002 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 2026-08-31.
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