Kasra Vaziri · Chief Product Officer at Supsindex

On product, craft & leadership .

I'm Kasra, CPO at Supsindex. I write about how good products actually get made — the craft, the hard calls, the messy middle — and I build Claude plugins that take the busywork off your plate.

Read the essays

Browse the plugins

Essays

What I'm thinking about

All essays

Building in Public

Building in Public: What It Costs and What It Pays

Building in public is a trade, not a gift. An honest ledger of the real payoffs (accountability, audience, feedback, distribution) and the real costs (noise, copycats, performative metrics, pressure) plus rules for doing it well.

July 9, 20266 min read

Product Leadership

AI Agent Guardrails: Autonomy Is a Product Decision

An AI agent got tricked into leaking private repos by an issue that said "Additionally." The lesson for product teams: how much autonomy you grant an agent isn't a security detail — it's the shape of the feature.

July 8, 20267 min read

Informational

How to Choose a North Star Metric That Actually Matters

A practical method for choosing a north star metric that captures real customer value instead of vanity numbers, with examples from Airbnb, Spotify, and Facebook.

July 8, 20267 min read

The toolbox

Claude plugins that do the busywork

Small, sharp tools for product people — drafting, synthesis, review. Free to start, installed in seconds.

All plugins

Product ManagementFree

PRD Architect

Turn a rough idea into a structured, review-ready PRD in minutes.

0 installs

Product ManagementFree

RICE Prioritizer

Score and rank your backlog with RICE — in seconds, not meetings.

0 installs

DevelopmentFree

Hello World

A tiny example plugin — see exactly how a Claude plugin works.

0 installs

The newsletter

Think more clearly about product

One email when I've got something worth your attention — an essay, a hard-won lesson, or a new tool. No filler, no fixed schedule. Unsubscribe in a click.