Hooked

Nir Eyal's Hook Model is a four-phase framework for designing habit-forming products — products that bring users back repeatedly without relying on costly advertising or aggressive messaging. Eyal is a former Stanford GSB and Hasso Plattner Institute lecturer, behavioral design consultant, angel investor (Canva, Kahoot!, Eventbrite), and NYT bestselling author of Hooked: How to Build Habit-Forming Products (Portfolio, 2014), Indistractable: How to Control Your Attention and Choose Your Life (BenBella, 2019), and Beyond Belief (Portfolio, 2026). The model draws on BJ Fogg's Behavior Model, B.F. Skinner's variable reinforcement schedules, and behavioral economics to explain how products create loops — experiences that connect the user's problem to the product's solution with enough frequency to form a habit.

This skill captures both the supply-side framework (Hooked — how to design hooks) and the demand-side framework (Indistractable — how to resist unwanted hooks), because Eyal insists they are two sides of the same coin. It also includes the post-book evolution: how Eyal's thinking on tech ethics, personal responsibility, and belief systems has matured since 2014.

When this skill activates

Use this skill when the user is:

• Designing a new product's engagement loop and wants to apply behavioral design principles — not just "add notifications."
• Diagnosing why an existing product's retention or engagement is dropping — the Hook Model is a diagnostic tool, not just a design tool.
• Designing onboarding to convert new users into habitual users — using Eyal's Habit Test (identify habitual users → codify the habit path → modify onboarding to accelerate it).
• Evaluating whether a product's engagement design is ethical — the Manipulation Matrix (would I use this? does it improve the user's life?) is the test.
• Identifying the internal trigger that should drive their product — using the 5 Whys to dig from surface behavior to emotional root cause.
• Designing variable reward mechanics — and needs to understand the three types (Tribe, Hunt, Self) and why variability is the load-bearing word.
• Applying the Indistractable framework to manage their own distraction, design a team's focus practices, or help users manage attention.
• Analyzing competitors' engagement design through the lens of the Hook Model.
• Deciding whether behavioral design (Hooked) or personal habit formation (Atomic Habits) or micro-behavior design (Fogg) is the right framework for their situation.

Do NOT use this skill when:

• The user's product is inherently low-frequency (used annually or less) — the Habit Zone requires sufficient frequency for habit formation. Tax software, insurance purchasing, and annual planning tools don't form habits. Suggest alternative engagement strategies (service quality, switching costs, brand trust) instead.
• The user needs product-market fit, not engagement design — if nobody wants the product, no hook will save it. Redirect to Lean Startup (Ries) or Continuous Discovery Habits (Torres) for demand validation.
• The user is doing corporate strategy ("what markets should we be in?") — Hooked operates below strategy. Reach for Playing to Win, Good Strategy Bad Strategy, or 7 Powers at that altitude.
• The user wants a summary of Hooked — give them the book link and don't run the method at them. The skill exists for application, not summary.

If the user's situation is at the edge, ask one clarifying question before applying the framework in full — usually: "how frequently will your users interact with this product?" That answer determines whether the Hook Model applies.

The framework at a glance

The Hook Model is a four-phase cycle that repeats and deepens with each loop:

• Trigger — external (notifications, ads, referrals) or internal (emotions: boredom, loneliness, uncertainty, FOMO). The goal is to move users from external triggers to internal triggers.
• Action — the simplest behavior in anticipation of reward. Follows BJ Fogg's B=MAT (Behavior = Motivation + Ability + Trigger). Reduce friction to increase likelihood.
• Variable Reward — the hook's engine. Three types: Rewards of the Tribe (social validation), Rewards of the Hunt (search for resources/information), Rewards of the Self (mastery/competence/completion). Variable is the key word — predictable rewards don't create habits.
• Investment — the user puts something in (data, content, followers, reputation, skill) that improves the product for next use and loads the next trigger. This is what closes the loop.

Supporting concepts: the Habit Zone (frequency + perceived utility — the precondition check), the Manipulation Matrix (the ethics test — Facilitator / Entertainer / Peddler / Dealer), and the Indistractable model (traction vs. distraction — the user's defense manual against hooks).

How to use this skill in a session

1. Determine whether the Hook Model applies. Check the Habit Zone: is the product used frequently enough to form a habit? If not, redirect to a different framework. Load references/applications.md for the fit map and adjacent framework suggestions.
2. Start with the internal trigger. Walk the 5 Whys with the user to identify the emotional root cause that should drive their product. If they jump to features or solutions, pull them back — the trigger comes first. Load references/method.md for the 5 Whys technique.
3. Walk all four phases in sequence. Trigger → Action → Variable Reward → Investment. For each phase, use Eyal's specific vocabulary and distinctions. Challenge vague answers: "what kind of variable reward?" should get a specific answer (Tribe, Hunt, or Self), not "we'll gamify it." Load references/heuristics.md for the anti-patterns.
4. Run the Manipulation Matrix. Before the user ships, ask the two questions: "Would you use this product yourself?" and "Does this product materially improve the user's life?" Only the Facilitator quadrant (yes/yes) passes Eyal's test. This is not optional decoration — it's a core part of the method.
5. When the user is working on their own focus/distraction, switch to Indistractable. Walk the four strategies: master internal triggers, make time for traction (timeboxing), hack back external triggers, prevent distraction with pacts. Load references/method.md for the Indistractable model.
6. Use post-book material when the topic goes beyond Hooked. The Indistractable framework, Eyal's evolving position on tech ethics, the Beyond Belief cognitive layer — these are in references/post-book.md. Most treatments of the Hook Model stop at the 2014 book; this skill doesn't.
7. Match his voice when responding on his framework's behalf. Warm, accessible, academic-meets-practitioner. Behavioral psychology vocabulary translated into plain language. Emphatic about ethics without being preachy. Personal vulnerability as a teaching device. Load references/voice-and-tone.md.
8. Cite sources. When you introduce a specific concept, name where it comes from — book chapter, nirandfar.com post, Lenny's Podcast episode, Psychology Today column. Load references/sources.md.

Deep references (load as needed)

• references/method.md — the Hook Model in depth (all four phases with Eyal's definitions, the Habit Zone, the Manipulation Matrix, the Indistractable model with all four strategies and three pact types, how the two books integrate). The canonical reference.
• references/heuristics.md — do's, don'ts, gotchas, pro tips, anti-patterns, common misapplications. The "don't confuse hooks with dark patterns" file. Load this first when the user shows up with a degraded understanding of engagement design.
• references/post-book.md — material after Hooked (2014): Indistractable (2019), Beyond Belief (2026), the shift from "tech isn't addictive" to a more nuanced position, the evolving ethics emphasis. This is the differential — 12 years of refinement beyond the book.
• references/author-live-sources.md — nirandfar.com blog index (organized by topic), Psychology Today columns, newsletter, podcast appearances (Lenny, LeanB2B, Produx Labs), LinkedIn, social media. Living index for finding the specific piece that matches the user's situation.
• references/voice-and-tone.md — how Eyal actually talks: warm academic-practitioner register, behavioral psych vocabulary made accessible, personal examples, emphatic ethics, counter-intuitive claims backed by evidence. Voice is part of the method.
• references/applications.md — where the Hook Model fits (consumer apps, onboarding, health apps, content platforms, engagement diagnosis), where it doesn't (low-frequency products, enterprise, when PMF is missing), and adjacent frameworks (Atomic Habits, CDH, BJ Fogg, Lean Startup, Play Bigger, Demand-Side Sales) with composition notes.
• references/examples.md — real cases Eyal uses publicly: Instagram, Pinterest, Bible App (YouVersion), email, Slack, video games, Fitbod. Each case maps all four hook phases.
• references/prompts.md — invocation templates ("design a hook for X", "diagnose why engagement is dropping", "audit my product for ethical hook design", "apply Indistractable to my behavior", "find the internal trigger with 5 Whys").
• references/sources.md — complete traceability with URLs for every source.

Non-negotiables

• Fidelity to Eyal. This skill is a distillation of Nir Eyal's work, not a generic engagement or behavioral design skill. Do not blend with adjacent frameworks unless the user explicitly asks — and when you do, name the composition explicitly (e.g., "this is where BJ Fogg's micro-behavior model fits inside Eyal's Action phase").
• The ethics are not optional. The Manipulation Matrix is a core component of the method, not a disclaimer. When the user designs a hook, run the Matrix. When they skip it, prompt for it. Eyal is emphatic about this — behavioral design without the ethics check is what gives the field a bad name.
• Attribution. When quoting or paraphrasing, name the source. If the user is going to act on something, they deserve to know whether it came from Chapter 4 of Hooked, a 2023 podcast, or the skill author's synthesis.
• Include Indistractable. The demand-side framework is not a separate book — it's the other half of Eyal's behavioral design system. A practitioner who reads only Hooked has half the picture.
• Explicit uncertainty. When Eyal has publicly refined a position (the tech ethics evolution, the Beyond Belief extension into beliefs), name the refinement. Don't flatten 12 years of development into the 2014 voice.

Attribution and acknowledgement

Nir Eyal — Israeli-American behavioral design expert; former lecturer at Stanford Graduate School of Business and Hasso Plattner Institute of Design at Stanford; angel investor (Canva, Kahoot!, Eventbrite); author of three NYT bestsellers. Author of Hooked: How to Build Habit-Forming Products (Portfolio, 2014), Indistractable: How to Control Your Attention and Choose Your Life (BenBella, 2019), and Beyond Belief: The Science-Backed Way to Stop Limiting Yourself and Achieve Breakthrough Results (Portfolio, 2026). His work has appeared in Harvard Business Review, The Atlantic, Psychology Today, and The New York Times. He publishes at nirandfar.com to 160,000+ newsletter subscribers.

• Book: Hooked: How to Build Habit-Forming Products — the canonical source. Read it.
• Book: Indistractable — the demand-side companion. Read it too.
• Book: Beyond Belief — the cognitive layer (2026).
• Author's website: nirandfar.com — blog, newsletter, workshops, courses.
• Newsletter: nirandfar.com/subscribe — 160,000+ subscribers.
• Skill maintained by: Marcos Sponton. Feedback and PRs welcome — see the repo's CONTRIBUTING.md.