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Brian Grinstead is a distinguished engineer at Mozilla, where he’s worked on Firefox and the web platform since 2013 (he joined to help launch Firefox DevTools). Recently he and his team pointed an agentic bug-finding pipeline at Firefox—a codebase with tens of thousands of files and tens of millions of lines of code—and shipped a record month of security fixes. The viral chart everyone saw gave the credit to Anthropic’s new Mythos model. Brian’s take is that the harness and pipeline did just as much of the work, and he walks through exactly how it runs and how anyone can build a starter version.
What you’ll learn:
—
Brought to you by:
WorkOS—Make your app enterprise-ready today
Metaview—The agentic recruiting platform for winning teams
—
In this episode, we cover:
(00:00) Introduction to Brian Grinstead
(02:43) The viral chart: Firefox Security Bug Fixes by Month
(05:32) How the custom harness works
(10:22) Goal loops and guardrails
(14:45) How they built it
(16:55) Real bugs, including a 15-year-old one
(23:00) Open-sourcing it
(26:26) Why humans still review every fix
(32:30) Live demo and prioritizing files
(40:18) Mobilizing the team and recap
(42:33) Lightning round
—
Tools referenced:
• Claude Code: https://claude.ai/code
• Claude Agent SDK: https://code.claude.com/docs/en/agent-sdk/overview
• Codex: https://openai.com/index/openai-codex/
• OpenAI Agent SDK: https://developers.openai.com/api/docs/guides/agents
• VS Code: https://code.visualstudio.com/
• Docker: https://www.docker.com/
• Firefox: https://www.mozilla.org/firefox/
• Address Sanitizer: https://github.com/google/sanitizers
• RLBox: https://rlbox.dev/
—
Other references:
• Mozilla Bug Bounty Program: https://www.mozilla.org/security/bug-bounty/
• Mozilla GitHub: https://github.com/mozilla
—
Where to find Brian Grinstead:
LinkedIn: https://www.linkedin.com/in/bgrins/
GitHub: https://github.com/bgrins
—
Where to find Claire Vo:
ChatPRD: https://www.chatprd.ai/
Website: https://clairevo.com/
LinkedIn: https://www.linkedin.com/in/clairevo/
X: https://x.com/clairevo
—
Production and marketing by https://penname.co/. For inquiries about sponsoring the podcast, email [email protected].
I break down every loop type from scratch—what a heartbeat, cron, hook, and goal loop actually are, when each one fits, and the five things any effective loop needs before it touches production. Then I build two live loops: a daily aging-PR reviewer in Claude Code that schedules itself at 10:15 a.m. and spins off its own subagents, and a weekly skills-identification loop in Codex that spawns goal-based subagents to validate its own output in real time.
What you’ll learn:
—
Brought to you by:
WorkOS—Make your app enterprise-ready today
Runway—The creative AI platform for images, video, and more
—
In this episode, we cover:
(00:00) Prompts are out and loops are in
(02:30) Defining a loop
(03:03) The four ways to automate a prompt: heartbeat, cron, hooks, and goals
(06:03) Five things every effective loop needs
(09:26) The “onboarding an employee” framework for designing loops
(11:58) Live build #1: Daily aging PR loop in Claude Code
(17:08) Subagents inside loops
(19:00) Live build #2: Weekly skills identification loop in Codex
(22:57) Watching subagents spin up in real time
(25:28) Warning signals around loops
(27:31) What listeners are doing with loops
—
Tools referenced:
• Claude Code: https://claude.ai/code
• Codex: https://chatgpt.com/codex
• OpenClaw: https://openclaw.ai/
—
Other references:
• Claire’s article “Why OpenClaw Feels Alive Even Though It’s Not”: https://x.com/clairevo/article/2017741569521271175
• Addy Osmani’s article on loop engineering: https://addyosmani.com/blog/loop-engineering/
• Using Goals in Codex: https://developers.openai.com/cookbook/examples/codex/using_goals_in_codex
—
Where to find Claire Vo:
ChatPRD: https://www.chatprd.ai/
Website: https://clairevo.com/
LinkedIn: https://www.linkedin.com/in/clairevo/
X: https://x.com/clairevo
—
Production and marketing by https://penname.co/. For inquiries about sponsoring the podcast, email [email protected].
In this episode, I sit down with Ankur Goyal, founder and CEO of Braintrust, the AI evals and observability platform used by teams like Notion, Stripe, Vercel, and Zapier. This one is for the senior engineers, staff engineers, VPs of engineering, and CTOs in my audience. We get into how coding agents can take on deeply technical architecture and infrastructure work that no single human engineer could tackle before, and then we demystify evals so you can use them to make your AI products better without touching the implementation.
What you’ll learn:
—
Brought to you by:
Guru—The AI layer of truth
Persona—Trusted identity verification for any use case
—
In this episode, we cover:
(00:00) Introduction to Ankur Goyal
(03:00) Using AI agents for database optimization
(06:10) Running exhaustive benchmarks with coding agents
(09:03) Why staff engineers are wrong about AI limitations
(11:30) The “agent line” framework for delegation
(14:00) Ankur’s workflow: running 4 to 6 concurrent agents
(17:16) Technical setup: foreground agents, background agents, and cloud environments
(20:32) Spending time with AI tools
(23:06) Demystifying evals
(26:02) Live demo: Building an eval for documentation answers
(30:20) The alternative to evals: vibe checks and whack-a-mole
(32:09) Capturing designer taste in scoring functions
(33:13) Quick recap
(33:44) Managing velocity and throughput
(35:40) Why CI/CD investment is critical for AI-accelerated teams
(37:30) Ankur’s prompting strategy when agents fail
(39:10) Closing thoughts and how to connect
—
Tools referenced:
• Braintrust: https://www.braintrust.dev/
• Codex: https://openai.com/codex/
• GPT 5.4: https://developers.openai.com/api/docs/models/gpt-5.4
• Claude: https://claude.ai/
—
Other references:
• GPT 5.5 just did what no other model could: https://www.lennysnewsletter.com/p/gpt-55-just-did-what-no-other-model
• Paul Graham’s Maker vs. Manager Schedule: http://www.paulgraham.com/makersschedule.html
• tmux: https://github.com/tmux/tmux
• Chris Tate at Vercel: https://www.linkedin.com/in/ctatedev/
—
Where to find Ankur Goyal:
LinkedIn: https://www.linkedin.com/in/ankrgyl/
—
Where to find Claire Vo:
ChatPRD: https://www.chatprd.ai/
Website: https://clairevo.com/
LinkedIn: https://www.linkedin.com/in/clairevo/
X: https://x.com/clairevo
—
Production and marketing by https://penname.co/. For inquiries about sponsoring the podcast, email [email protected].
Claude Fable 5 is the first Mythos-class intelligence model to be generally available, and I got early access to test it before launch. In this episode, I walk through what Anthropic is promising, what actually stood out when I used it on real work, and where I think it fits in your AI stack.
—
In this episode, we cover:
(00:00) Introduction: Fable 5 is finally here
(00:31) What Anthropic says about the model
(05:14) Token-intensive by design
(06:28) Safety classifiers and the new fallback concept
(07:46) Is this or is this not Mythos?
(08:30) New product launches: Managed Agents and more
(09:20) Crushing benchmarks
(09:55) What it’s actually like to use (the good and the bad)
(11:40) Test 1: product graph spec
(12:56) Test 2: designing a skills registry
(14:04) Conservative on execution
(14:43) Test 3: multi-agent orchestration
(15:39) My takeaways
—
Tools referenced:
• Claude Fable 5: https://www.anthropic.com/news/claude-fable-5-mythos-5
• Claude Managed Agents: https://platform.claude.com/docs/en/managed-agents/overview
—
Other reference:
• SWBench Pro benchmark: https://www.swebench.com/
—
Where to find Claire Vo:
ChatPRD: https://www.chatprd.ai/
Website: https://clairevo.com/
LinkedIn: https://www.linkedin.com/in/clairevo/
X: https://x.com/clairevo
—
Production and marketing by https://penname.co/. For inquiries about sponsoring the podcast, email [email protected].
Nicole Ruiz is a writer and parent who has built a comprehensive AI-powered shopping system to help her family buy high-quality, long-lasting items while avoiding the noise of drop-shipping brands, paid ads, and poorly made products. She writes an interview series on Substack about how technology is changing the household.
What you’ll learn:
—
Brought to you by:
Orkes—The enterprise platform for reliable applications and agentic workflows
Metaview—The agentic recruiting platform for winning teams
—
In this episode, we cover:
(00:00) Introduction to Nicole and AI-powered shopping
(02:29) The problem
(04:55) Building a Claude Project for household purchasing
(07:44) The “anti-to-do list” concept for reducing mental overhead
(10:30) Shopping for a can opener: the system in action
(15:53) How AI helps century-old brands with terrible websites
(18:45) Processing returns with Claude Cowork
(25:06) Using gift cards strategically
(26:33) Vetting brands
(29:40) Recap, lightning round, and final thoughts
—
Tools referenced:
• Claude: https://claude.ai/
• Claude Cowork: https://www.anthropic.com/product/claude-cowork
—
Other references:
• Boston General Store: https://bostongeneralstore.com/
• L.L.Bean: https://www.llbean.com/
• Manufactum: https://www.manufactum.com/
• 5 OpenClaw agents run my home, finances, and code | Jesse Genet: https://www.lennysnewsletter.com/p/5-openclaw-agents-run-my-home-finances
• From a $6.90 newsletter to $3M API: How a non-coder built Memelord | Jason Levin: https://www.lennysnewsletter.com/p/from-a-690-newsletter-to-3m-api-how
—
Where to find Nicole Ruiz:
X: https://x.com/nwilliams030
Substack (The Third Oikos): https://www.thirdoikos.com/
—
Where to find Claire Vo:
ChatPRD: https://www.chatprd.ai/
Website: https://clairevo.com/
LinkedIn: https://www.linkedin.com/in/clairevo/
X: https://x.com/clairevo
—
Production and marketing by https://penname.co/. For inquiries about sponsoring the podcast, email [email protected].
In this experimental episode, I document my real-time attempt to create an AI avatar of myself using Google Flow and the new Gemini Omni video generation model. I walk through the entire process—from scanning my face with my phone to generating a complete one-minute hype video for the podcast, all in about 15 minutes.
What you’ll learn:
—
Brought to you by:
Merge—Connective infrastructure for production AI
Jira Product Discovery—Prioritize with insights, build with confidence
—
In this episode, we cover:
(00:00) Getting started with Google Flow and Gemini Omni
(01:38) The avatar creation process: scanning and photo capture
(02:55) Using Flow to brainstorm a hype video storyboard
(06:59) Generating the first video scene with the avatar
(08:41) Troubleshooting: accidentally generating images instead of videos
(09:32) Generating all seven scenes for the complete video
(11:37) Reviewing the avatar videos
(13:13) Stitching the videos together in the browser-based editor
(14:32) The complete How I AI hype video
(15:32) What worked and what didn’t
(19:04) Final thoughts
—
Tools referenced:
• Google Flow: https://labs.google/fx/tools/flow
• Gemini Omni: https://gemini.google/overview/video-generation/
• Veo 3: https://deepmind.google/technologies/veo/
—
Where to find Claire Vo:
ChatPRD: https://www.chatprd.ai/
Website: https://clairevo.com/
LinkedIn: https://www.linkedin.com/in/clairevo/
X: https://x.com/clairevo
—
Production and marketing by https://penname.co/. For inquiries about sponsoring the podcast, email [email protected].
Bryce Rattner Keithley has spent her career in talent and recruiting, working with technical leaders but never writing a line of code herself. Yet she managed to build Daily Hundred—a fitness app featuring custom AI-generated videos of anthropomorphic animals demonstrating exercises—and ship it to the App Store before her software engineer friends. Using Replit, Claude, Gemini, and a relentless beginner’s mindset, Bryce proves that in the AI era, execution is no longer the constraint on good ideas.
What you’ll learn:
—
Brought to you by:
WorkOS—Make your app enterprise-ready today
Metaview—The agentic recruiting platform for winning teams
—
In this episode, we cover:
(00:00) Introduction to Bryce and Daily Hundred
(04:48) Building with Replit
(06:16) The beginner’s mindset advantage
(11:17) Creating anthropomorphic animals
(22:55) Moving from static image to video
(27:15) The floating genie and other anthropomorphic animal generations
(30:46) Shifting from web app to App Store submission
(36:24) User feedback
(37:41) Lightning round and final thoughts
—
Tools referenced:
• Replit: https://replit.com/
• Lovable: https://lovable.dev/
• Claude: https://claude.ai/
• Claude Code: https://claude.ai/code
• Gemini: https://gemini.google.com/
• Higgsfield: https://higgsfield.ai/
• Kling: https://kling.ai/
• Railway: https://railway.app/
• TestFlight: https://developer.apple.com/testflight/
—
Other references:
• How a 91-year-old vibe coded a complex event management system using Claude and Replit | John Blackman: https://www.lennysnewsletter.com/p/how-a-91-year-old-vibe-coded-a-complex
• What Got You Here Won’t Get You There: https://www.amazon.com/What-Got-Here-Wont-There/dp/1401301304
• How Women Rise: https://www.amazon.com/How-Women-Rise-Holding-Careers/dp/0316440124
• A Whole New Mind: https://www.amazon.com/Whole-New-Mind-Right-Brainers-Future/dp/1594481717
• How to Win Friends and Influence People: https://www.amazon.com/How-Win-Friends-Influence-People/dp/0671027034
—
Where to find Bryce Rattner Keithley:
LinkedIn: https://www.linkedin.com/in/brycerattner/
GitHub: https://github.com/brk-bot/
Daily Hundred on the App Store: https://apps.apple.com/us/app/daily100-fitness-challenge/id6762108062
—
Where to find Claire Vo:
ChatPRD: https://www.chatprd.ai/
Website: https://clairevo.com/
LinkedIn: https://www.linkedin.com/in/clairevo/
X: https://x.com/clairevo
—
Production and marketing by https://penname.co/. For inquiries about sponsoring the podcast, email [email protected].
I got a few hours of early-access testing with Anthropic’s newly released model Opus 4.8. I walk through real coding, design, and strategy tasks across Claude Code and Claude Cowork, and give you my unfiltered view on what impressed me and what didn’t.
—
What you’ll learn:
—
In this episode, we cover:
(00:00) Introduction to Opus 4.8
(00:44) Benchmark performance and pricing
(01:53) First coding test: Building a prototyping tool
(03:00) Where it failed: The last 10% problem
(03:27) The hallucination problem
(04:23) Testing Opus 4.8 on existing codebases
(05:24) The ambition test: Building games for a 9-year-old
(07:03) Business strategy test: 4.7 vs 4.8
(08:23) The roadmap test
(09:17) Final verdict
—
References:
• System Card: Claude Opus 4.8: https://cdn.sanity.io/files/4zrzovbb/website/c886650a2e96fc0925c805a1a7ca77314ccbf4a6.pdf
• Introducing Claude Opus 4.8 on X: https://x.com/claudeai/status/2060042702150930686?s=20
—
Where to find Claire Vo:
ChatPRD: https://www.chatprd.ai/
Website: https://clairevo.com/
LinkedIn: https://www.linkedin.com/in/clairevo/
X: https://x.com/clairevo
—
Production and marketing by https://penname.co/. For inquiries about sponsoring the podcast, email [email protected].
In this 30-minute episode, I walk through my favorite feature in Codex: the /goal command. I show how Goals transform AI from a turn-based assistant that needs constant ‘what’s next?’ prompting into an autonomous agent that can work for hours on complex, multi-step tasks. I share three real examples: eliminating thousands of Sentry errors, cleaning 3,900 emails down to 68, and organizing hundreds of Linear tasks.
What you’ll learn:
—
Brought to you by:
Mercury—Radically different banking loved by over 300K entrepreneurs
—
In this episode, we cover:
(00:00) Introduction
(01:50) What is /goal and when should you use it?
(02:45) The difference between prompts and Goal-based loops
(04:06) Claire’s first five-hour 45-minute autonomous coding task
(05:05) How to manage a Goal lifecycle: view, pause, resume, and clear
(06:06) How to write strong goals: outcomes vs. outputs
(07:34) The six components of effective Goals
(08:57) Example: Reducing P95 checkout latency with /goal
(09:36) Demo: Using /goal to eliminate Sentry errors in ChatPRD
(13:18) Demo: Burning down Vercel API errors
(17:28) Non-technical use case: Cleaning 3,900 emails with /goal
(21:24) Demo: Using /goal to clean up Linear project tasks
(24:41) When not to use /goal
(26:10) Why /goal changes everything
—
Tools referenced:
• Codex: https://openai.com/codex/
• Sentry: https://sentry.io/
• Vercel: https://vercel.com/
• Linear: https://linear.app/
—
Other reference:
• OpenAI blog post “Using Goals in Codex”: https://developers.openai.com/cookbook/examples/codex/using_goals_in_codex
—
Where to find Claire Vo:
ChatPRD: https://www.chatprd.ai/
Website: https://clairevo.com/
LinkedIn: https://www.linkedin.com/in/clairevo/
X: https://x.com/clairevo
—
Production and marketing by https://penname.co/. For inquiries about sponsoring the podcast, email [email protected].
Felix Rieseberg is the engineering lead for Claude Cowork and Claude Code Desktop at Anthropic. He previously spent five years at Slack building developer tools. In this episode, Felix demonstrates how he uses Claude to solve real-life problems: analyzing floor plans to build interactive 3D house walkthroughs, automatically tracking promises he makes on Twitter, and building a $20 hardware device that physically approves Claude actions with a button press.
What you’ll learn:
—
Brought to you by:
Magic Patterns—Prototypes that look like your product
Guru—The AI layer of truth
—
In this episode, we cover:
(00:00) Introduction to Felix Rieseberg
(02:40) Felix’s role at Anthropic
(03:25) The multiple tabs in Claude and why they exist
(05:55) Using Claude Cowork to design a new house using floor plans
(09:52) When to use Opus versus Sonnet 4.6
(12:37) Building an interactive 3D furniture planner
(14:30) Using your email as a source of truth for personal inventory
(15:58) The anti-to-do list: going one abstraction layer up
(23:14) Introduction to live artifacts
(26:02) Building a personal dashboard with live data
(28:37) Being polite to Claude (and why it matters for your humanity)
(30:28) Claude interaction tips
(32:33) Looking at the daily dashboard
(33:55) How live artifacts work with connectors
(35:02) Redesigning the dashboard
(37:55) The biggest gap: people don’t know what problems AI can solve
(41:52) The reverse interview
(42:30) Making latency delightful through asynchronous design
(44:05) The redesigned dashboard
(45:28) AI should free up your creative energy
(46:44) Building a $20 hardware Claude buddy
(52:33) Why kids are magical AI users
(54:30) Recap and final thoughts
—
Tools referenced:
• Claude Cowork: https://www.anthropic.com/product/claude-cowork
• Claude Code: https://claude.ai/code
• Claude for Chrome: https://code.claude.com/docs/en/chrome
• Claude Desktop: https://claude.ai/download
• Live Artifacts: https://support.claude.com/en/articles/14729249-use-live-artifacts-in-claude-cowork
• Connectors (Spotify, Gmail, Calendar, Notion): https://claude.ai/settings/connectors
• Slack: https://slack.com/
—
Where to find Felix Rieseberg:
Website: https://felixrieseberg.com/
LinkedIn: https://www.linkedin.com/in/felixrieseberg/
X: https://x.com/felixrieseberg
GitHub: https://github.com/felixrieseberg
—
Where to find Claire Vo:
ChatPRD: https://www.chatprd.ai/
Website: https://clairevo.com/
LinkedIn: https://www.linkedin.com/in/clairevo/
X: https://x.com/clairevo
—
Production and marketing by https://penname.co/. For inquiries about sponsoring the podcast, email [email protected].
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