A Walkthrough of the Hooked Skill: Building Habit-Forming Products Responsibly
Five commands that apply Nir Eyal's Hook Model — mapping your triggers, designing variable rewards, building investment loops, and checking your ethics.
Nir Eyal spent years studying habit-forming technology products and distilled his findings into the Hook Model: Trigger → Action → Variable Reward → Investment. Hooked is both a design manual and a philosophical prompt: if you can make a product habit-forming, should you?
The Hooked BookSkill has five commands. Here's what each does.
The Five Commands
/hook-canvas — Map Your Full Hook Model
What it does: Builds the complete Hook Canvas for your product — all four phases of the Hook Model applied to your specific use case. What triggers bring users to your product? What action do they take? What variable reward do they receive? What investment do they make that loads the next trigger?
What you get: A Hook Canvas diagram — a complete map of your product's hook cycle, with each phase analyzed and gaps identified.
When to use it: First. The canvas establishes the full picture before you optimize any individual component.
/trigger-design — Design Internal and External Triggers
What it does: Eyal's distinction: external triggers (notifications, emails, ads) bring users back initially; internal triggers (emotional states associated with the product) are what sustains long-term habit use. The most powerful hooks attach the product to an internal trigger — often a negative emotion like boredom, loneliness, uncertainty, or fear of missing out. This command designs both trigger types for your product.
What you get: A trigger strategy — your external triggers (the prompts that bring users to the product initially) and your internal triggers (the emotional states you're attaching to the product), with a plan for building both.
When to use it: After the hook canvas identifies your current trigger situation. The trigger design is most valuable when you don't yet have strong internal triggers.
/variable-reward — Design the Compelling Return
What it does: Variable rewards — rewards that are unpredictable in timing or magnitude — are more compelling than fixed rewards. This is why social media feeds, slot machines, and email all produce compulsive checking: you never know if this time will bring something interesting. This command designs variable rewards for your product across Eyal's three types: Rewards of the Tribe (social approval), Rewards of the Hunt (information and resources), and Rewards of the Self (mastery and completion).
What you get: A reward system design — specific variable reward mechanisms appropriate to your product and user base.
When to use it: After establishing your triggers. The variable reward is what makes the action compelling enough to repeat.
/investment-loop — Design the Behavior That Loads the Next Trigger
What it does: Eyal's investment phase — the user doing something that stores value in the product and increases the likelihood of return. Following people on social media (investment: your network), creating a playlist (investment: your taste data), writing a review (investment: your content) — all make the product more valuable to you specifically and make you more likely to return. This command designs the investment phase for your product.
What you get: An investment loop design — the specific behaviors you'll invite users to take that store value and set up the next external trigger.
When to use it: After designing your variable rewards. The investment loop completes the hook cycle.
/manipulation-matrix — Check Your Ethics
What it does: Eyal's most important contribution in Hooked is the ethics check he builds into the framework: the Manipulation Matrix. The two axes are "Does using this product materially improve the user's life?" and "Would you use this product yourself?" Products in the facilitator quadrant (yes to both) are building genuine value. Products in the dealer quadrant (you'd use it, but it doesn't improve the user) and peddler quadrant (it improves the user, but you wouldn't use it) are in more complex ethical territory.
What you get: A manipulation matrix assessment — where your product falls in the ethical framework, and what that means for how you design and market it.
When to use it: As part of the hook design process, not after. The ethics check should inform the design, not just evaluate the completed product.
Recommended Sequence
/hook-canvas— map your full hook cycle/trigger-design— establish internal and external triggers/variable-reward— design compelling returns/investment-loop— load the next trigger/manipulation-matrix— check the ethics at every stage
The Ethics Are the Point
Eyal's most mature contribution to Hooked is his honest acknowledgment that the same techniques that make products valuable can make them compulsive and harmful. The manipulation matrix forces the question that most product teams avoid: are we building something that genuinely improves our users' lives, or are we building something that captures their attention by exploiting psychological vulnerabilities?
The Hooked Skill includes the ethics check as a core component — not an appendix. A habit-forming product built on genuine value is sustainable and defensible. One built on manipulation is not.
Ready to build your Hook Canvas? Get the Hooked BookSkill and start with /hook-canvas.