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 Infrasity-Labs/dev-gtm-claude-skills --skill cold-email-writergit clone --depth 1 https://github.com/Infrasity-Labs/dev-gtm-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/infrasity-labs/dev-gtm-claude-skills/cold-email-writer)<a href="https://agentmods.dev/skills/infrasity-labs/dev-gtm-claude-skills/cold-email-writer"><img src="https://agentmods.dev/badge/skills/infrasity-labs/dev-gtm-claude-skills/cold-email-writer/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/infrasity-labs/dev-gtm-claude-skills/cold-email-writer"><img src="https://agentmods.dev/badge/skills/infrasity-labs/dev-gtm-claude-skills/cold-email-writer.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 | $0.00024 | $0.01706 |
| Opus 5 | $0.00012 | $0.00853 |
| Sonnet 5 | $0.00005 | $0.00341 |
| Haiku 4.5 | $0.00002 | $0.00171 |
Grade A, and why
cold-email-writer 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 9d 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.
This is a copy
100% identical to cold-email-writer — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 214 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cold Email Writer
When to Use This Skill
Use this skill when the user wants to:
- Write a cold outreach email to a hiring manager, founder, or recruiter
- Reach out about a job opening they weren't referred to
- Introduce themselves to a company they want to work at
- Mentions: "cold email", "reach out", "intro email", "outreach", "contact hiring manager"
Core Principle
Cold emails fail because they sound like cover letters. The goal is to sound like a smart person who genuinely noticed something specific about the company — not a candidate broadcasting their credentials.
The email should feel like: A colleague mentioning something interesting they read, not a sales pitch.
The Template Structure
Subject
Quick intro — [First Name Last Name]
Simple. No clickbait. No role title. Just a name.
Opening — The Hook (2-3 sentences)
Start with what genuinely pulled the candidate in. Must be specific to this company — not a generic compliment.
I just came across [Company] and ended up spending more time on it than I expected.
[One specific thing that caught their attention — a stat, a product decision, a market insight from the JD or website]
What makes a good hook:
- A specific number or stat from the company's materials ("only 5% of the market is online")
- A product decision that shows you understand the domain ("you're building from scratch alongside underwriters, not just distribution")
- A technical insight from the JD ("improving the data infrastructure for LLM usage, not just the model layer")
What makes a bad hook:
- Generic: "I love what you're building"
- Vague: "Your mission resonates with me"
- Flattering: "You're one of the most exciting companies in the space"
Location Disclosure (if international)
If the candidate is in a different country from the company, disclose it early and casually:
Before you read further, I should mention I'm based in [country]. But if we both
feel there's a strong fit, I'd be open to figuring things out.
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.
- 9d ago First seen · 214 lines · 24 tokens per session scan A b8b576b5e917
cold-email-writer is a skill published in the GitHub repository Infrasity-Labs/dev-gtm-claude-skills (124 stars, last pushed 2mo ago), licensed MIT. It adds 24 tokens to every session and 1,706 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to cold-email-writer, differing in 0 lines, and is treated as a copy.
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