How does this skill help my emails avoid the spam folder?

This skill is built to follow deliverability best practices, automatically stripping out blacklisted keywords and enforcing strict character counts (30-50 characters) to ensure lines aren't truncated on mobile or flagged by automated filters.

What exactly do I receive after providing my campaign details?

You will receive 8 distinct subject lines per request, including a recommended A/B test pairing and a brief explanation of the psychological angle (e.g., curiosity vs. direct value) used for each.

Which AI agents or platforms is this skill compatible with?

This skill is compatible with all major AI agents and LLMs currently supported on our marketplace; simply add it to your agent's library to begin generating lines within your existing workflow.

What information do I need to provide for the best results?

While the generator is framework-agnostic, you must provide a clear target audience, your core offer, and a specific tone to ensure the output is relevant and effective for your niche.

Will I receive updates if spam filter requirements change?

Yes, your purchase includes lifetime access to the skill, including all future updates to our deliverability blacklist and logic improvements based on changing email provider algorithms.

Cold Email Subject Line Generator

Example session with this skill installed

Audience: Content creators targeting Desi kids.
Offer: Consistent cartoon character design and 9:16 vertical video animation formatting.
Tone: Casual

Read your context and instructions
Compiled the cold email subject

Subject Lines

for creators making content for desi kids — 41 — Personalized/specific
your characters keep drifting off-model? — 40 — Curiosity/open loop
other kids' channels fixed this already — 39 — Social proof/pattern interrupt
built for creators like you, not agencies — 41 — Personalized/specific
consistent character design, 9:16 ready — 39 — Direct value/benefit
quick question about your character art — 39 — Curiosity/open loop
same character, every single episode — 36 — Direct value/benefit
vertical video formatting for your show — 39 — Direct value/benefit

Recommended A/B Pair

Test #1 ("for creators making content for desi kids") against #2 ("your characters keep drifting off-model?") — one leads with direct audience recognition, the other opens a curiosity gap about a pain point, so you'll learn whether specificity or intrigue drives more opens for this list.

Connects securely to your tools. The creator never sees your data.

What you get

Create spam-filter safe subject lines that avoid common trigger words.Generate variety across curiosity, value, and social proof angles.Enforce strict character limits for mobile-optimized email previews.Identify the best A/B testing pairs for new outbound campaigns.

About this skill

High-volume cold outreach fails when subject lines trigger spam filters or look like automated templates. This skill generates high-open-rate subject lines that bypass technical filters by strictly adhering to character counts, casing rules, and deliverability best practices. It stops you from using "spammy" trigger words and ensures every line feels written by a human.

What it does

Deliverability filtering removes common spam triggers and ensures safe character counts for mobile and desktop previews.
Multi-angle drafting produces options based on curiosity, direct value, personalization, and social proof.
Tone enforcement adapts copy for formal, casual, or urgent contexts without losing professional credibility.
A/B test selection identifies the two strongest contrasting options to help you optimize campaign performance.

How it works

Provide context by sharing your target audience, your core offer, and your desired tone.
Include hooks like recent funding rounds or hiring news to enable deeper personalization.
Receive 8 lines curated for length, deliverability, and variety across different psychological angles.

Frameworks & tools

This skill is framework-agnostic and works for any outbound platform including Salesloft, Outreach, HubSpot, or Apollo. It follows deliverability standards compatible with Google and Outlook spam filters.

Why this beats prompting it yourself

Generic prompts often result in subject lines that are too long, use "salesy" language that triggers filters, or feel repetitive. This skill enforces strict character limits (30-50) and a hard ban on blacklisted terms, ensuring your emails actually land in the inbox.

Use cases

Sales outreach for VPs and executives where brevity and relevance are required.
Recruiting emails to passive candidates that need to stand out in a crowded inbox.
Partnership requests where a curiosity-based open loop drives higher engagement.

Known limitations

Requires specific audience and offer details to work. Does not generate the full email body, only the subject lines.

How to install

Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.

~30 seconds

1
Download the ZIP
Free skills download straight away. Paid skills unlock right after purchase.
2
Unzip into your skills folder
Every agent reads skills from one folder on your machine. Drop the unzipped folder in there.
3
Ask your agent to use it
Restart the agent if it was already running. It picks the skill up automatically - no config needed.

Skills folder by agent

Click the path to copy it. Create the folder if it does not exist yet.

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Cold Email Subject Line Generator