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 agentmods add instructions/andytoizer/gtm-brain-builder/claude-mdgit 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/instructions/andytoizer/gtm-brain-builder/claude-md)<a href="https://agentmods.dev/instructions/andytoizer/gtm-brain-builder/claude-md"><img src="https://agentmods.dev/badge/instructions/andytoizer/gtm-brain-builder/claude-md.svg" alt="Measured on agentmods" 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 | $0.00188 | $0.00188 |
| Opus 5 | $0.00094 | $0.00094 |
| Sonnet 5 | $0.00038 | $0.00038 |
| Haiku 4.5 | $0.00019 | $0.00019 |
Grade A, and why
gtm-brain-builder CLAUDE.md 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 5d 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
Agent Instructions
This repository packages the GTM Brain Builder plugin for public use.
Public Packaging Rules
- Keep the repo generic and reusable.
- Do not add private GTM data, customer evidence, transcripts, credentials, local
.envfiles, or company-specific exports. - If adding examples, use fictional company names.
- Keep plugin content scoped to agents, skills, references, and scripts that help someone build their own GTM Brain.
Validation
Before publishing changes:
python3 -m json.tool .codex-plugin/plugin.json >/dev/null
python3 scripts/init_gtm_brain.py "Test GTM Brain" --path /tmp/Test-GTM-Brain --force
Also check for accidental private data:
rg -n "api[_-]?key|secret|password|token|/Users/|\\.env|customer export|transcript" .
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.
- 5d ago First seen · 26 lines · 188 tokens per session scan A 00c131b29f4f
gtm-brain-builder CLAUDE.md is an instructions file published in the GitHub repository Andytoizer/gtm-brain-builder (8 stars, last pushed 3mo ago), licensed MIT. It adds 188 tokens to every session, about $0.0009 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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