The zero-egress trick that lets me give away a media tool for free
I run a small free tool called imgi . You drop in two images, drag a slider to compare them, and get a permanent link to paste anywhere. Before and af…
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I Built an AI Publishing Stack for $31/Month — Real Numbers After 15 Posts
I've been building a solo content operation in public for the past month. The goal: run a real publishing workflow — blog posts, analytics, affiliate …
My "Deploy to Cloudflare" button disabled auth
I recently open-sourced Minvoice , a small invoicing app that runs entirely on Cloudflare Workers. Like every well-behaved open-source Workers project…
I built a free before/after image slider on Cloudflare Workers (to show off my game mods)
I make graphics mods for Oblivion Remastered. My most-downloaded one, Lumiere, adds hundreds of lights across the world at night, and the only honest …
How I Built an Ultra-Fast Bilingual Dictionary Handling 293,000+ Words on the Edge
Every developer has that one project. The passion build that sits in the back of your mind for months—or even years—before you finally sit down, crack…
Cloudflare’s new policy pushes AI companies to pay for publishers’ content
Cloudflare is giving AI companies until September 15 to separate web crawlers used for search from those used for AI training and agents, or risk bein…
My agent dry-ran fine in staging 100 times — then wrecked production on the first real run
A staging-to-production data bleed cost me 4 hours of rollback. That's what finally made dry-run a structural requirement, not an afterthought. The co…
`wrangler dev --remote` silently writes to your production KV namespace — here's the fix
I lost production data on a Tuesday afternoon because wrangler.toml had one missing field. Not a code bug. Not a logic error. A missing preview_id . B…
My Anthropic bill dropped from $312 to $156 after I added two bash hooks to Claude Code
60% of a $312 Anthropic bill came from a single pattern: Claude Code hitting a D1 migration failure, then spinning up 7–8 retry Bash calls trying to d…
800 simultaneous Workers, one cache miss, $40/mo surprise — the Cloudflare coalescing fix
A Korean flash sale at 9PM cost me $40 in a single month — not from KV reads, but from 800 concurrent Workers all racing to fetch the same product JSO…
D1 Schema Migrations with AI Agents: The DDL-in-Transaction Trap That Kills Zero-Downtime Deploys
Running an AI agent to execute your D1 migrations will silently wreck your database — unless you explicitly forbid it from wrapping DDL in a transacti…
A one-line cache key bug cost me $187/month and leaked advertiser data across tenants
60% of my $312 Anthropic bill last month came from a single bug: an MCP router cache key that was missing a tenant ID. The fix was literally this: // …
My Durable Objects alarm loop burned CPU for 3 days before I noticed — here's what the docs miss
A 30-line Slack notifier was eating 60% of my CPU-time budget across 4 client Workers. The culprit: a runaway alarm loop I assumed was impossible. Her…
Self-Hosted Hermes Agent on iOS: Cloudflare Tunnel + Access Service Tokens + Hermex
Self-Hosted Hermes Agent on iOS: Cloudflare Tunnel + Access Service Tokens + Hermex Get your Hermes Agent on your iPhone - without paying for a relay,…
Cutting Claude API Costs in Half with a 3-Tier Routing System (Haiku/Sonnet/Opus)
Adding more Claude subagents made my pipeline slower past 6 — but the real problem wasn't concurrency at all. When I finally looked at the cost logs f…
60% of My $312 Anthropic Bill Came From One Missing Pattern: Compensating Actions
Last month's Anthropic invoice was $312. After one architectural change, May came in at $156 — exactly half. The culprit wasn't prompt bloat or model …
KV locks for Workers cron jobs will silently fail — here's what I use instead
A ghost lock blocked every cron trigger for 6 hours after a Korean ad-network API took 45 seconds to respond — 15 seconds past the Workers wall clock …
Comments on a static blog — no backend, no login, all Cloudflare
Comments on a static blog — no backend, no login, all Cloudflare I run a small Astro blog on Cloudflare Pages. It mixes developer write-ups with perso…
Deploy an AI Tar Pit With Nepenthes or AI Labyrinth
LLM crawlers are eating your bandwidth and you can't block your way out of it. Return a 403 and the scraper shrugs, rotates the IP, swaps the user-age…
Cloudflare under the hood: how it works and how attackers try to get around it
1. What Cloudflare actually is Cloudflare is not a reverse proxy running on one server somewhere. It is a globally distributed edge network with over …
I let Claude Code run --dangerously-skip-permissions on my production DB. Here's what I changed.
Last Tuesday at 3am, a multi-agent loop hit 12K KV writes/minute and froze. The loop was a one-line counter bug. That part was fixable. What I found w…
The NOT NULL trap that killed my Cloudflare Worker at 2:47am
A single ALTER TABLE statement took down one of my Workers mid-deploy. No maintenance window, no graceful fallback — just a wall of 500s while live tr…
How We Built an AI SaaS on the Edge for Nearly $0 in Infrastructure Costs
1. Introduction A few months ago, we started building Propoza , a tool that generates business proposals with AI for Brazilian freelancers and small b…
API Design Patterns for Cloudflare Workers: Minimal, Secure, Fast
API Design Patterns for Cloudflare Workers: Minimal, Secure, Fast I've built APIs on every platform—traditional servers, Lambda, containers. But Cloud…
Zero-JS Wasn't Enough: Edge Caching SSR HTML on Cloudflare Workers
The previous article ended with a confession: same build, two PageSpeed runs two hours apart, desktop Performance 99 and then 90. I blamed first-scree…
AI doesn't write bad code. It writes plausible code — so I tried to break my own AI-built app
Disclosure: I work on one of the tools in this post ( create-microservices-app ). But the experiment, commands, and outputs below are real, and the pa…
My agent was 'succeeding' on Slack while silently doing nothing — here's the monitoring stack that caught it
My Slack bot was firing success messages while D1 row count sat completely frozen. The agent wasn't crashing — it was completing its Slack notificatio…
D1 read replicas returned stale data for 6 seconds — here's what I measured and how I designed around it
At p99, a D1 read replica in Tokyo was 6.1 seconds behind a write that landed on the Eastern NA primary. I found this out not from the docs, but from …
Your AI Agent Can Delete Your DNS Records
Your AI agent just deleted the A record for your production domain. It was trying to "clean up stale DNS entries" after you asked it to audit your Clo…
I wasted $43 rebuilding a Vectorize index the wrong way — here's the $5.50 fix
Last month's Anthropic bill hit $312. Sixty percent of it traced back to a single 6-hour window when I was doing an in-place Vectorize index rebuild. …