50 Best Claude AI Prompts 2026: The Ultimate Prompt Library

You are a senior staff engineer. Review the following code and identify:
(1) bugs or edge cases, (2) security vulnerabilities, (3) performance issues,
(4) readability improvements. Be brutally honest. Output as a numbered list with severity (HIGH/MEDIUM/LOW).

Code: [paste code]

Refactor this legacy code to be modern, clean, and idiomatic. Preserve all functionality.
Add type hints/types, extract magic numbers, improve naming. Show before/after.

Code: [paste code]

I'm getting this error: [error message]. Here's the relevant code: [code].
Walk through possible root causes in order of likelihood. For each, explain why it might
happen and how to test/fix it.

Write unit tests for this function. Cover: happy path, edge cases, invalid inputs,
error conditions. Use [pytest/jest/etc]. Aim for 95%+ branch coverage.

Function: [paste function]

Convert this [source language] code to idiomatic [target language]. Preserve all behavior.
Note any language-specific gotchas or differences.

Code: [paste code]

Explain this code as if teaching a junior developer. Cover: what it does, why it's
structured this way, what each section accomplishes, and any non-obvious gotchas.

Code: [paste code]

Optimize this SQL query for performance. Suggest indexes, rewrite joins if needed,
and explain why each change helps. Show EXPLAIN plan analysis.

Query: [paste SQL]

Generate comprehensive documentation for this code/API. Include: overview,
parameters, return values, examples, edge cases, common errors. Format as markdown.

Code: [paste code]

Review this system architecture: [describe system]. Identify scalability issues,
single points of failure, security risks. Suggest improvements with tradeoffs.

Design a RESTful API for [feature]. Include: endpoints, methods, request/response
schemas, error codes, auth approach, rate limiting. Output as OpenAPI 3.0 YAML.

Write a 1500-word SEO-optimized blog post on [topic]. Include: H2/H3 headings,
target keyword "[keyword]" used naturally 4-6 times, FAQ section, meta description,
internal linking suggestions.

Write a 4-sentence cold email pitching [product/service] to [audience]. Use a
specific hook, clear value prop, and one soft CTA. No corporate jargon.

Generate 20 compelling headlines for [topic/product]. Mix formats: how-to, listicle,
question, contrarian, urgent. Rate top 3 by curiosity gap and click probability.

Turn this content [paste content] into a viral Twitter/X thread: 8-12 tweets,
hook in tweet 1, one idea per tweet, end with summary + CTA. Use line breaks for
readability.

Write a weekly newsletter for [audience] covering [topics]. Structure: hook intro
(2 lines), 3 main sections with takeaways, CTA at end. Casual tone. 400 words max.

Apply Donald Miller's StoryBrand framework to my product [product]. Output:
the hero, their problem, the guide (us), the plan, call to action, success vs failure.

Write a 10-minute YouTube video script on [topic]. Format: 8-second hook, intro,
3 main points with examples, CTA. Include B-roll suggestions and pattern interrupts.

Edit this draft for clarity, concision, and impact. Cut filler. Strengthen verbs.
Improve flow. Preserve voice. Output edited version + bullet list of major changes.

Draft: [paste]

Take this article [paste] and repurpose into: Twitter thread, LinkedIn post,
Instagram carousel script, YouTube short script, podcast episode outline.

Rewrite this AI-generated text to sound human. Remove formulaic phrases, vary sentence
length, add specific details and personal voice. Avoid "delve", "tapestry", "navigate".

Text: [paste]

Build a detailed customer persona for [product]. Include: demographics, psychographics,
pain points, goals, objections, where they hang out online, buying triggers.

Analyze top 5 competitors of [my product/service]. Output: their positioning,
strengths, weaknesses, pricing, target audience, content strategy. Suggest 3 gaps
I can exploit.

Write conversion-optimized sales page copy for [product]. Sections: hero headline,
problem agitation, solution, features→benefits, social proof prompts, FAQ, CTA.
Use AIDA framework.

Create a 90-day marketing plan for [business] with budget $[X]. Include:
channels, campaigns, KPIs, week-by-week roadmap. Prioritize highest ROI.

Recommend pricing tiers for [product]. Consider: value perception, competitor
pricing, customer willingness to pay, psychological anchors. Output 3 tiers with
reasoning.

Build a launch plan for [product] launching in [timeframe]. Pre-launch (4 weeks),
launch week, post-launch (2 weeks). Include emails, social posts, PR, partnerships.

Generate 15 customer discovery interview questions for [product idea]. Mix:
open-ended, behavior-focused (not opinion). Avoid leading questions. Mom Test style.

Create a 30-day social media content calendar for [brand] on [platform]. Mix
educational, entertaining, promotional. Include hooks, captions, hashtags, post times.

Top 10 objections customers have about [product]. For each: customer's underlying
fear, 1-sentence reframe, supporting proof point.

Outline a 12-slide investor pitch deck for [startup]. Include: problem, solution,
market, product, traction, business model, competition, team, financials, ask.

Explain [complex topic] like I'm 5 years old. Use analogies kids understand.
Then give a slightly more advanced explanation for a curious 12-year-old.

Summarize this research paper [paste/link]. Include: key findings, methodology,
limitations, implications, why it matters. 300 words max.

I want to learn [topic]. Coach me using the Feynman Technique. Ask me to explain
what I know, identify my gaps, then re-teach. Iterate until I understand deeply.

Build a 30-day study plan to master [topic/exam]. Daily breakdown with:
topics, practice problems, review cadence, milestones. Assume [X] hours/day.

Steelman the strongest possible argument against [my position]. Present it as
if you genuinely believe it. Then steelman my position too. Help me see both sides.

Summarize the book [title] by [author]. Include: 5 core ideas, key frameworks,
best quotes, who should read it, takeaways. 500 words.

Be my [language] tutor. We'll have a conversation. Correct my mistakes after
each response. Suggest better phrasings. Adapt to [my level]. Start with [topic].

Create a mind map for [topic]. Output as nested bullet points showing main
concepts, sub-concepts, and connections. Include 2-3 key examples per node.

Compare [Framework A] vs [Framework B] for [use case]. Output: side-by-side
strengths/weaknesses, when to use each, common pitfalls, learning curve.

Generate 20 likely interview questions for [job role] and ideal answers using
the STAR method. Mix behavioral, technical, and situational.

Review my week. Here's what happened: [list events/accomplishments]. Help me:
(1) celebrate wins, (2) extract lessons, (3) plan next week's top 3 priorities.

I need to choose between [Option A] and [Option B]. Build a weighted decision
matrix considering: cost, effort, impact, risk, reversibility. Recommend with reasoning.

Turn this work experience into 5 impact-focused resume bullets. Start with action
verbs, quantify results, use STAR format implicit. Tailor to [target role].

Experience: [paste]

Summarize these meeting notes. Output: key decisions, action items (with owner &
date), open questions, follow-up needed. Format for sharing.

Notes: [paste]

Plan a [X-day] trip to [destination] for [travelers/interests]. Include:
daily itinerary, accommodations style, food recommendations, hidden gems, budget estimate.

I need to have a hard conversation about [topic] with [person]. Help me prepare:
key message, anticipated responses, how to stay calm, what NOT to say.

Generate a 7-day meal plan: [calories]/day, [diet type], [budget], cook time
under [X] min. Include shopping list grouped by store section.

Build a [X]-week workout plan for [goal: strength/cardio/fat-loss]. [Days/week],
[equipment available]. Include: exercises, sets, reps, rest, progression.

Here's what I did yesterday: [list]. Turn this into a clean 3-line daily standup:
yesterday, today, blockers. Professional tone.

Help me run a year-end review. Ask me reflection questions about: wins, lessons,
relationships, health, career, finances. Then help me set next year's themes & goals.