Cold Email Subject Generator

The problem

Cold emails die in the inbox because subject lines look like spam or get cut off on mobile devices. Writing high-open variants for A/B testing is time-consuming and prone to repetitive patterns.

What it does

• Generates 10 distinct subject line variants based on specific recipient roles and value propositions.
• Categorizes every subject by psychological angle including curiosity, benefit-driven, specific, and interrogative.
• Enforces character limits to ensure readability on mobile email clients.
• Filters out spam triggers, false urgency, and clickbait tactics that damage sender reputation.

Why this beats prompting it yourself

General LLM prompts often return generic, salesy headlines that trigger spam filters. This skill enforces a strict "no-fluff" constraint and organizes output into a structured A/B testing framework out of the box.

Use cases

• Generating a test set for a new B2B outbound sequence.
• Refreshing underperforming campaigns with new psychological angles.
• Localizing subject line tone for specific markets like the US or SEA.
• Ensuring mobile-first visibility for executive-level prospects.