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 Growth-Today/claude-skills --skill gt-email-infragit clone --depth 1 https://github.com/Growth-Today/claude-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/growth-today/claude-skills/gt-email-infra)<a href="https://agentmods.dev/skills/growth-today/claude-skills/gt-email-infra"><img src="https://agentmods.dev/badge/skills/growth-today/claude-skills/gt-email-infra/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/growth-today/claude-skills/gt-email-infra"><img src="https://agentmods.dev/badge/skills/growth-today/claude-skills/gt-email-infra.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 | $0.00232 | $0.04210 |
| Opus 5.5 | $0.00093 | $0.01684 |
| Sonnet 5.5 | $0.00046 | $0.00842 |
| Haiku 4.5 | $0.00023 | $0.00421 |
Grade A, and why
gt-email-infra 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 — 236 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Setup (Run Once Per Session)
Before loading any sub-skill or resource, locate this skill's install directory:
- Use Glob to search for
**/gt-email-infra/SKILL.md. - The directory containing this SKILL.md is
SKILL_BASE. - Sub-skills are at:
{SKILL_BASE}/.claude/skills/{sub-skill}/gt-SKILL.md. - Resources are at:
{SKILL_BASE}/resources/....
Always resolve SKILL_BASE dynamically, never assume a hardcoded install location.
Email Infrastructure & Deliverability, Orchestrator
This skill is the plumbing that gets cold email delivered, not the message itself. Route by who you are and what you're doing to the one sub-skill that matches. Each sub-skill is self-contained and ends in a copy-pasteable checklist.
Platform: this skill supports the sequencers Growth Today uses, EmailBison, Instantly, Smartlead, and Lemlist. Use the matching setup sub-skill for whichever you run. Concepts are ESP-agnostic; platform-specific steps are called out inline.
When NOT to use this skill
- Writing the email, subject lines, body, sequences, personalization →
gt-cold-email-writer. - Building or verifying the lead list →
gt-list-builder. - Marketing emails / newsletters, this is cold-outreach infrastructure only.
- CRM setup or data hygiene →
gt-hubspot-admin/gt-salesforce-admin.
Sub-Skill Routing
| You are… | You want to… | Sub-skill | Path |
|---|---|---|---|
| Sales Ops | Research and buy sending domains | domain-research | {SKILL_BASE}/.claude/skills/domain-research/gt-SKILL.md |
| Sales Ops | Provision mailboxes + DNS/auth (masking, not redirect) | provisioning | {SKILL_BASE}/.claude/skills/provisioning/gt-SKILL.md |
| Sales Ops | Set up / connect inboxes in EmailBison | emailbison-setup | {SKILL_BASE}/.claude/skills/emailbison-setup/gt-SKILL.md |
| Sales Ops | Set up / connect inboxes in Instantly | instantly-setup | {SKILL_BASE}/.claude/skills/instantly-setup/gt-SKILL.md |
| Sales Ops | Set up / connect inboxes in Smartlead | smartlead-setup | {SKILL_BASE}/.claude/skills/smartlead-setup/gt-SKILL.md |
| Sales Ops | Set up / connect inboxes in Lemlist (email + LinkedIn) | lemlist-setup | {SKILL_BASE}/.claude/skills/lemlist-setup/gt-SKILL.md |
| Sales Ops → GTM | Warm up and take domains live | warmup-golive | {SKILL_BASE}/.claude/skills/warmup-golive/gt-SKILL.md |
| GTM Engineer | Build campaigns, route by ESP/SEG | campaign-building | {SKILL_BASE}/.claude/skills/campaign-building/gt-SKILL.md |
| GTM Engineer | Read the inbox-health dashboard, act on it | dashboard-reading | {SKILL_BASE}/.claude/skills/dashboard-reading/gt-SKILL.md |
| GTM Engineer | Verify a workspace is set up correctly (live audit) | setup-audit | {SKILL_BASE}/.claude/skills/setup-audit/gt-SKILL.md |
| GTM Engineer | Audit a bounce / blacklist to root cause | blacklist-bounce-audit | {SKILL_BASE}/.claude/skills/blacklist-bounce-audit/gt-SKILL.md |
What ships with it
26 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.
- .claude/skills/blacklist-bounce-audit/gt-SKILL.md 16 KB
- .claude/skills/campaign-building/gt-SKILL.md 12 KB
- .claude/skills/dashboard-reading/gt-SKILL.md 13 KB
- .claude/skills/domain-research/gt-SKILL.md 9.6 KB
- .claude/skills/emailbison-setup/gt-SKILL.md 9.8 KB
- .claude/skills/instantly-setup/gt-SKILL.md 14 KB
- .claude/skills/lemlist-setup/gt-SKILL.md 8.8 KB
- .claude/skills/provisioning/gt-SKILL.md 9.8 KB
- .claude/skills/setup-audit/gt-SKILL.md 16 KB
- .claude/skills/smartlead-setup/gt-SKILL.md 7.5 KB
- .claude/skills/warmup-golive/gt-SKILL.md 6.4 KB
- .env.example 891 B
- .gitignore 53 B
- CHANGELOG.md 10 KB
- LICENSE 1.0 KB
- playbooks/dns-auth-audit/playbook.md 8.8 KB
- playbooks/dns-auth-audit/scripts/after.py 3.1 KB runs code
- playbooks/dns-auth-audit/scripts/execute.py 15 KB runs code
- playbooks/dns-auth-audit/scripts/test_gate.py 3.7 KB runs code
- playbooks/sizing-calculator/playbook.md 7.0 KB
- playbooks/sizing-calculator/scripts/execute.py 11 KB runs code
- README.md 4.4 KB
- requirements.txt 613 B
- resources/approved-vendors.md 6.2 KB
- resources/benchmarks.md 7.4 KB
- resources/reference.md 20 KB
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 Changed · -1 lines · +232 tokens per session f0cc79a49d9e
- 1mo ago Changed 335b43bbebfb
- 1mo ago Changed · +114 lines · -232 tokens per session ed21868656cc
- 1mo ago First seen · 123 lines · 232 tokens per session scan A 1ce274b77086
gt-email-infra is a skill published in the GitHub repository Growth-Today/claude-skills (6 stars, last pushed 16d ago), licensed MIT. It adds 232 tokens to every session and 4,210 once invoked, about $0.0009 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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