Cold EmailPopular
Cold email writer
You need to write a B2B cold email that gets replies.
You get Three email variants · Subject lines · Why each angle works
First line personalization Claude skill
Use this to add a personal opener to each contact on a list. The line proves the email was written for the reader and leads naturally into the problem the email is about.
- 5-step play
- 5 guardrails
- 1 file
- Human approval built in
Use it when you need personalised first lines (icebreakers) for cold emails or LinkedIn messages at scale.
Then just ask your agent
“Write personalised first lines for these 80 leads. The email is about cutting SDR ramp time.”
Watch it work
One request in, expert work out
What happens when you ask your agent with this skill installed. Every step below comes straight from the skill.
You
Write personalised first lines for these 80 leads. The email is about cutting SDR ramp time.
Loaded skill
first-line-personalization- Research each lead quickly
- Write the line with a bridge
- Grade every line
- Write fallbacks, never fiction
- Check the merge
One opener per lead · Source per line · Quality grade
Ready for your review. Nothing is sent or changed until you approve.
- 5Steps in the play
- 5Guardrails
- 1Files in the skill
- 2 minTo read it all
What good looks like
- Every A and B line has a source link a reviewer can click.
- Lines vary in structure; 200 lines starting "I saw that…" read as automation.
- The common mistake is personalising on trivia (school, hometown, a vacation photo) that has nothing to do with the email.
What you bring
- Lead list with names and companies
- The email the line opens
- Research sources
What you get
- One opener per lead
- Source per line
- Quality grade
- Fallback lines
name:first-line-personalization
description:Use this skill when you need personalised first lines (icebreakers) for cold emails or LinkedIn messages at scale: "write personalised openers for this list", "add a custom first line for each lead", "make my…
Use this to add a personal opener to each contact on a list. The line proves the email was written for the reader and leads naturally into the problem the email is about.
Inputs
- The list: name, title, company, profile link, domain.
- The email the line will open, so the line can bridge into it.
- Allowed sources: company site, news, job listings, the person’s public posts and talks.
The play
1. Research each lead quickly
Spend 1-3 minutes per lead. Look for, in order: something they said or wrote, a change in their role or team, a company trigger, a specific detail of how their company works.
2. Write the line with a bridge
Formula: specific observation + why it connects to the email’s problem. The second half is what makes personalization work; an observation with no bridge is a compliment, and compliments get ignored.
- No bridge: "Loved your podcast episode on hiring."
- With bridge: "Your point on the podcast that hiring SDRs is easy and ramping them is hard is exactly the problem below."
3. Grade every line
| Grade | Meaning |
|---|---|
| A | Specific to the person and connected to the problem |
| B | Specific to the company and connected |
| C | Role or industry level, honest and relevant (fallback) |
| Fail | Invented, generic flattery, or unrelated trivia; never ship |
Aim for A or B on Tier 1 contacts; C is acceptable for Tier 3.
4. Write fallbacks, never fiction
When research finds nothing, write a C line about the role at their company’s stage. A sincere role-level line outperforms a fake personal one, and it never gets caught.
5. Check the merge
The line must read naturally after "Hi {first name}," and before the email’s second sentence. Check 5 rendered examples.
Output format
name | company | first line | grade | source link | bridge usedPlus counts per grade and the leads where research found nothing.
What good looks like
- Every A and B line has a source link a reviewer can click.
- Lines vary in structure; 200 lines starting "I saw that…" read as automation.
- The common mistake is personalising on trivia (school, hometown, a vacation photo) that has nothing to do with the email.
Rules
- MUST attach a source to every A and B line.
- MUST use a fallback line rather than invent a detail.
- NEVER mention personal life, family, health or appearance.
- NEVER claim to have read, watched or listened to something you did not.
- NEVER reference profile views, website visits or other tracking.
Example prompts
- "Write personalised first lines for these 80 leads. The email is about cutting SDR ramp time."
- "Grade the first lines in this campaign and rewrite the C and Fail ones."
- "Give me fallback openers for Heads of Operations when there’s no research."
Try it
Ask your agent like this
Once the skill is installed, plain requests like these load it automatically. Swap in your own company, buyer and numbers.
-
“Write personalised first lines for these 80 leads. The email is about cutting SDR ramp time.”
-
“Grade the first lines in this campaign and rewrite the C and Fail ones.”
-
“Give me fallback openers for Heads of Operations when there's no research.”
What does the First line personalization skill do?
Use this to add a personal opener to each contact on a list. The line proves the email was written for the reader and leads naturally into the problem the email is about. You get: one opener per lead, source per line, quality grade, fallback lines.
When should I use the first line personalization skill?
Use it when you need personalised first lines (icebreakers) for cold emails or LinkedIn messages at scale.
How do I install First line personalization in Claude Code?
Run /plugin marketplace add prosyo-ai/gtm-skill and then /plugin install gtm-skills@prosyo to add the whole library, or run npx skills add prosyo-ai/gtm-skill –skill first-line-personalization for this skill alone. In Claude.ai, download the .zip from this page and upload it under Settings, Capabilities, Skills.
What do I need to give the agent?
Have these ready: lead list with names and companies, the email the line opens, research sources. If something is missing, the skill tells the agent to ask for it rather than guess.
Does it work with ChatGPT, Codex, Cursor or Gemini?
Yes. The skill is a plain SKILL.md file with no vendor lock-in. Agents that load skills natively (Claude Code, Claude.ai, Codex, Cursor, Gemini CLI and others) pick it up automatically; anywhere else, paste the file into the conversation as instructions.
Will it send emails or messages on its own?
No. Every skill in the library drafts, researches and analyses, and waits for a person to approve anything that sends, schedules or changes records in bulk. Your inbox, CRM and accounts stay under your control.
Is it free, and can I change it?
Yes. It is free and MIT-licensed. Copy it, adapt it to your market and voice, and if you improve it, open a pull request so everyone gets the better version.
Keep going
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Open source
Have a play that works? Share it as a skill.
Paste this into Claude, Codex or any agent. It interviews you about your play, writes the skill in the house format, checks it and opens the pull request. Once it is merged, it shows up here with your name on it.
Prompt for your agent
Fetch https://raw.githubusercontent.com/prosyo-ai/gtm-skill/main/AGENTS.md and follow its submission flow. Interview me about my GTM play (the real numbers, rubrics and examples), draft it in their format with reference pages, validate it and open the pull request.
Two ways to run it
Run it yourself, or put it on autopilot
The skill gives your agent the playbook. Penny, the Prosyo AI SDR, runs plays like this for you every day across LinkedIn and email.
Free · this skill
You and your agentBest for trying the play and one-off work
- Your agent follows the first line personalization playbook step by step
- You bring the inputs and run it when you need it
- Works in Claude, Codex, Cursor and 40+ agents
- You review every draft before it goes anywhere
Prosyo AI SDR
Penny runs it for youBest for a pipeline that grows every day
- Finds the right buyers for your ICP every day
- Writes from what each prospect actually posted
- Follows up on LinkedIn and email at a safe, human pace
- Every reply lands in one inbox with an answer drafted
- You approve what goes out
Skills draft the play. Penny runs it.
Penny, the Prosyo AI SDR, finds your buyers, writes from what they actually posted, follows up on LinkedIn and email and lands every reply in one inbox with an answer ready. 7 days free, no card.
- 7 days free
- No card required
- Cancel in two clicks
