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subject-line-writer

Use this skill when you need cold email subject lines that get opened and do not look like marketing: "write subject lines for this email", "my open rates are low", "A/B test subject lines". Writes short, lowercase, internal-looking subject lines matched to the email's angle, explains the pattern behind each, flags spam and clickbait risks, and sets up a fair subject-line test. For cold outreach, follow-ups and re-engagement emails.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

prosyo-ai/gtm-skill스타 11(GitHub 11 + cccskills 0)

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  • SKILL.md3.5 KB

SKILL.md(원문)

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Use this after the email is written. The subject line's job is to get the email opened by the right person without promising something the body does not deliver.

Inputs

  • The email body (subject lines are written for a specific email, never in a vacuum).
  • The persona and seniority.
  • The trigger or angle the email uses.

The play

1. Write in the patterns that work for cold B2B

PatternExampleWhen
Topic, two to four words"month-end close"Default
Trigger reference"new sdr team", "the series b"Email leads with a trigger
Peer or customer"contoso's close"Strong, approved proof
Question"manual reconciliations?"Pain is very common
Their initiative"europe expansion"Announced plan
Mutual context (only if real)"maria suggested i reach out"Genuine referral

2. Follow the format rules

  • 1 to 5 words; under 40 characters so it is not cut on phones.
  • Lowercase or sentence case; it should look like it came from a colleague.
  • No first-name merge field in the subject (it reads as automated), no emojis, no exclamation marks, no "quick question".
  • The subject must be true to the email. Clickbait wins opens and loses replies and trust.

3. Give options per pattern

Return 2-3 options for 3 patterns. Mark the recommended one.

4. Test fairly

  • Change only the subject; keep body, list and send time the same.
  • At least 200 sends per variant before judging.
  • Judge on reply rate, not opens. Open tracking is unreliable: privacy features pre-load images and inflate opens, and many teams disable tracking pixels to protect deliverability.

Output format

Recommended: <subject>
Topic: <3 options>
Trigger: <3 options>
Question: <3 options>
Avoid: <any risky phrasing found and why>
Test: A = <..>, B = <..>, judge on reply rate after 200+ sends each

What good looks like

  • Reads like a peer's email in a crowded inbox.
  • Connects directly to the first line of the email.
  • No spam-pattern words: "free", "guarantee", "act now", "limited time", percentages off.
  • The common mistake is clever or vague subjects ("thoughts?", "a crazy idea") that get opened out of curiosity and then deleted with irritation.

Rules

  • MUST keep subject lines under 40 characters.
  • MUST match the subject to the email's actual content.
  • NEVER use fake reply or forward prefixes ("Re:", "Fwd:") on a first email.
  • NEVER use a referral subject unless the referral is real.

Example prompts

  • "Write subject lines for this cold email to CFOs."
  • "Give me 10 subject lines for a follow-up that shares a case study."
  • "Set up a subject line test for our new campaign."

리뷰

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이 양식은 reCAPTCHA로 보호되며 Google 개인정보처리방침 및 서비스 약관이 적용됩니다.

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