Blog - Yusuke Wada

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Cloudflare Workers Tech Talks in Tokyo #5

Cloudflare Workers Tech Talks in Tokyo #5

On June 3rd, I held “Cloudflare Workers Tech Talks in Tokyo #5”. Before the main event, we also conducted a workshop for around 20 participants. Despite the rainy weather, around 90 people attended the main event out of 126 registrations, showing incredible dedication from the community. Here is a report on the event.

What is Cloudflare Workers Tech Talks?

Cloudflare Workers Tech Talks is an event where developers who are developing using Cloudflare Workers talk about Cloudflare Workers. It has been held four times in Tokyo and twice in Osaka. The feature of this event is that the speakers are free to talk about whatever they want. I often tell the speakers, “Please don’t give introductions like ‘What is Cloudflare Workers?’“. I ask them to talk about whatever they want to talk about.

Venue

Thanks to Cybozu, we were able to use their office near Tokyo Station for this event. The location was incredibly convenient and the facilities were excellent. Thank you!

Workshop

Before the main event, we held a hands-on workshop focused on building remote MCP servers on Cloudflare Workers. About 20 people participated in this session.

https://workers-tech.connpass.com/event/355900/

Attendees

We recruited attendees via the following connpass site.

https://workers-tech.connpass.com/event/355239/

We had 126 registrations, and despite the heavy rain, approximately 90 people attended the event. The high attendance rate even in bad weather shows how passionate the Japanese Workers community is!

Talks

This event featured a diverse range of topics, from AI and MCP to real-time applications and game infrastructure. We had presentations from both Japanese developers and Cloudflare Developer Relations team members. From Cloudflare, Ricky Robinett (Manager), Michael Hart (Engineer), and Tanmay (Community Manager) joined us for this event.

Monetizing MCP Servers with Stripe and Cloudflare by @hidetaka_dev

Hidetaka Okamoto

Hidetaka Okamoto from DigitalCube, former Stripe Developer Advocate, talked about monetizing MCP servers using Stripe and Cloudflare. He introduced Stripe’s MCP payments feature, which enables paid MCP server services. The presentation also covered “Agentic Commerce” - a fascinating concept where AI agents can search for gifts within a budget. It was intriguing to imagine a future where agents autonomously handle shopping tasks.

The slides: https://docswell.com/s/4172320093/Z4VPDJ-2025-06-03-192743

Serverless WebRTC with Cloudflare Realtime and Workers by @Nekoya3_

Nekoya

Nekoya from MIERUNE demonstrated building serverless WebRTC using Cloudflare Realtime and Workers. He provided clear explanations of WebRTC concepts including STUN, TURN, and SFU, and showed how each corresponds to Cloudflare’s Realtime products (formerly known as Calls). The presentation concluded with a live demo showcasing the technology in action. This was particularly interesting as it showcased one of the newer Cloudflare technologies.

The slides: https://speakerdeck.com/nekoya3/cloudflare-realtime-to-workers-detukurusabaresu-webrtc

Game Asset Distribution Infrastructure for Project Sekai with Workers and Hono by @2kasa0131

Tsukasa Takahashi from Colorful Palette shared how they implemented the game asset distribution infrastructure for ”Project Sekai Colorful Stage! feat. Hatsune Miku”, a popular mobile game in Japan, using Workers and Hono. The architecture stores game assets in R2 and uses the Cache API to cache subsequent accesses, eliminating egress costs which makes it very cost-effective. They also implemented access controls to prevent unauthorized access to unreleased assets. Interestingly, they use Terraform instead of Wrangler for Workers deployment. This was a great example of how Workers can scale to handle gaming workloads, and it was exciting to see Hono being used in such a major production system.

MCP in the real world by @hichaelmart

Michael Hart

Michael Hart from Cloudflare gave a presentation about real-world applications of MCP, sharing insights from the Cloudflare team’s perspective on this emerging technology. The audience was amazed to learn that he had committed MCP server code just one day after Anthropic announced MCP on their blog on November 26, 2024!

The presentation covered practical tips for implementing MCP servers, including:

Claude Code + Vibe Coding + Cloudflare by @rickyrobinett

Ricky Robinett from Cloudflare demonstrated “Vibe Coding” - coding with AI agents. Since Ricky was using both hands for the live demo on his PC, I had to serve as a human microphone stand! The most exciting part was watching a three-way battle between Gemini, Claude Code, and Cursor to build a blog service running on Workers. Initially, Gemini was leading, but in the final moments, Claude Code pulled off a stunning victory by creating a beautiful page design. The timing was perfect, and the audience went wild! As a former amateur magician, Ricky’s showmanship was absolutely spectacular!

Lightning Talks

We also had several 5-minute lightning talks covering a range of topics:

Mastra ❤️ Cloudflare by @kmd_09

kmd_09

Introduction to Mastra framework integration with Cloudflare.

The slides: https://speakerdeck.com/kmd09/gao-ji-neng-naaiezientowobao-su-dezuo-rufang-fa

Hanabi fading into night by @inaridiy, @yutakobayashi__, and @moons_dev

Hanabi team

The Hanabi.rest team has previously presented at Workers Tech Talks and participated in the Cloudflare Launchpad program. Their service was like v0, allowing users to create web applications using LLM. While we were amazed by their innovative ideas and rapid implementation, they announced the end of development due to the rapid advancement of LLM technology making it difficult to compete. It’s unfortunate, but we’re grateful for the dreams they showed us.

The slides: https://docs.google.com/presentation/d/1g8zW7qrG1PqVBrw5gHQeJXQoFMlYw5fAy8QiqCGsFko/edit?usp=sharing

Using Workers for Per-Page OGP in CSR SPAs by @namazu510

namazu

Namazu shared a real-world implementation from Pixiv, the popular illustration sharing platform, showing practical use cases for dynamic OGP generation.

Hono x MCPs x Workers by @MathurAditya7

Aditya

Aditya, a Hono contributor who came all the way from India, demonstrated how to build MCP servers using Hono middleware on Workers, perfectly connecting to Michael’s earlier presentation about MCP implementations.

Feedback

I asked the attendees to post on X with the hashtag #workers_tech. You can see the results below.

https://x.com/search?q=%23workers_tech

Networking

After all the talks, we had a networking session with pizza and beer at the same venue. Everyone enjoyed great conversations and the atmosphere was fantastic!

Summary

Workers Tech Talks #5 was an incredible event showcasing the diversity and innovation within the Workers ecosystem. From AI and MCP implementations to real-time applications and gaming infrastructure, we saw how developers are pushing the boundaries of what’s possible with Cloudflare Workers.

Special thanks to:

We packed 5 main talks and 4 lightning talks into just 2 hours, and it was incredibly fun! All the participants seemed very satisfied with the event. We’re planning the next Workers Tech Talks for the end of this year or early next year.

Thank you so much to the venue, all the speakers, and everyone who attended!

Look at this amazing group photo we took at the end!

Group photo