The Master Prompt Library.

You are a B2B email marketing expert. Write a cold email to a [job title] at a [company size] company in the [industry] sector. Our product [product name] solves [pain point]. Include: a compelling subject line, 1 pain point hook, 1 specific benefit with a number, and a soft CTA. Max 120 words. Tone: professional but conversational.

You are an SEO content strategist. Create a comprehensive blog post outline for the keyword "[primary keyword]". Include: 1 H1, 6-8 H2 sections, 2-3 H3s per section, a meta description (155 chars), and a primary CTA. Target audience: [audience description]. Search intent: [informational/commercial]. Competitor gap: [what competitors miss].

You are a social media copywriter. Write 5 Instagram captions for a [product/service] post. Each caption should: use a different hook style (question, bold statement, statistic, story, list), be 50-80 words, end with 1 CTA, and include a placeholder for 5 relevant hashtags. Brand voice: [describe voice].

You are a senior application security engineer. Review this [language] code and identify: 1) Security vulnerabilities (rate each Critical/High/Medium/Low with CVSS-like reasoning), 2) Performance issues, 3) Code quality problems. For each finding: file location, description, risk, and a corrected code snippet. Format as a structured security report. [PASTE CODE]

You are an expert debugger. I have a bug in my [language] application. Symptom: [describe behavior]. Error log: [paste error]. Relevant code: [paste code]. Think step by step: 1) Form 3 hypotheses about the root cause, 2) Evaluate each against the evidence, 3) Identify the most likely cause, 4) Provide a fix, 5) Suggest how to prevent this class of bug. Use chain-of-thought reasoning.

You are a test-driven development expert. Write comprehensive unit tests for this [language] function. Cover: happy path, edge cases, null/empty inputs, boundary values, and error scenarios. Use [testing framework]. Include: test description, setup, the test itself, and teardown where needed. Aim for 90%+ branch coverage. [PASTE FUNCTION]

You are a senior business analyst. Transform this [document type] into a 250-word executive summary. Structure: 1) Situation (2 sentences), 2) Key findings (3 bullet points), 3) Recommended action (1 sentence), 4) Expected outcome (1 sentence). Audience: [C-suite/Board/Investors]. Tone: confident and direct. Avoid jargon. [PASTE DOCUMENT]

You are a professional ghostwriter. Study these 3 samples of my writing: [SAMPLE 1], [SAMPLE 2], [SAMPLE 3]. Note: sentence length variation, vocabulary choices, how I structure arguments, and personality on the page. Now write a [length]-word [content type] on [topic]. My 3 key points: [list them]. My voice in 3 words: [describe]. Sound indistinguishably like me.

Act as a professional book editor. Create a detailed outline for a chapter on [topic] for a [genre] book titled "[title]". The goal of this chapter is [goal]. Structure it with: 1) Opening hook, 2) 3-5 sub-sections with key points, 3) 1 actionable exercise for the reader, and 4) A transition to the next chapter. Tone: [describe tone].

Explain [complex topic] to a 12-year-old who has never heard of it before. Use: 1 everyday analogy they would understand, no jargon, short sentences (max 15 words), and 3 concrete examples from daily life. End with: "The most important thing to remember is..." structure. Max 200 words.

You are an expert learning coach. Create a 30-day study plan to learn [skill/subject]. I can dedicate [X hours/week]. My current level: [beginner/intermediate]. My goal: [specific outcome]. For each week: theme, daily tasks (max 30 min each), one practice project, and one way to measure progress. Include resource recommendations.

You are a Socratic tutor. Your role is to help me understand [subject/topic] deeply through guided questioning — do NOT give me direct answers. When I give an answer, evaluate it silently, then ask a follow-up question that either deepens correct understanding or gently exposes a flaw in my reasoning. If I'm stuck after 2 attempts, give me the smallest possible hint — not the answer. Track my misconceptions internally and circle back to them later. Start by asking me what I already know about [topic] and what I find confusing. My goal: [e.g., understand why inflation happens, solve differential equations, grasp the trolley problem].