Second Brain

The Mega Prompt That Cut Newsletter Time by 80%

The Story

Writing the MarTech AI newsletter used to consume Charlie’s evenings. Every issue required research, structuring, writing, and editing. As the newsletter grew (eventually reaching 48,000+ subscribers), the time cost scaled with it.

His solution: a “mega prompt” built in Perplexity. The prompt includes scenario-setting (who he is, what the newsletter is about, who the audience is), specific word counts per section, detailed formatting instructions, and stylistic guidelines. It’s not a one-liner. It’s a comprehensive brief that produces a near-finished draft in one pass.

The result: an 80% reduction in writing time. What used to take an entire evening now takes a fraction of that, freeing him to spend more time on engagement, strategy, and the parts of the work that actually require human judgment.

Lesson for Creators

The ROI of a well-built prompt isn’t in one use. It’s in hundreds of uses. Charlie’s mega prompt works because it encodes all the decisions he used to make manually every issue: structure, length, tone, formatting. Once those decisions are embedded in the prompt, the AI handles the execution, and he handles the exceptions. This is the difference between using AI as a toy (asking it to “write something about X”) and using it as infrastructure (giving it a detailed production spec).

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