Kazuhiro Sera

@seratch

Developer Experience @OpenAI | ex-Slack SDK dev & DevRel, SmartNews VPoE | JP 🇯🇵 @seratch_ja

Tokyo, Japan

Joined December 2010

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Kazuhiro Sera@seratch · Jun 3

A few years after creating Bolt framework for Slack app developers, I'm now focusing my energy on a new SDK for AI agent developers! github.com/openai/openai-…

seratch's tweet card. A lightweight, powerful framework for multi-agent workflows and voice agents - openai/openai-agents-js

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Andre Saraiva@andresnds · Jul 17

1/N Yesterday in Tokyo we @OpenAI ran a 10‑hour live Humans vs AI exhibition at the AtCoder World Tour Finals Heuristic. We pointed an OpenAI reasoning model at the same brutal problem the finalists tackled—no human help, same rules, same clock. Buckle up. 👇

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Kazuhiro Sera@seratch · Jun 11

OpenAI Agents SDK for TypeScript now fully supports MCP servers as tools! Can't wait to see what you create with it 🙌

ddominik kundel@DKundel · Jun 11

Thanks to the hard work of @seratch we now have support in the TypeScript OpenAI Agents SDK for: ⋅ Remote MCP servers using the Responses API ⋅ Local MCP server support through stdio and streamable HTTP ⋅ MCP support for non-OpenAI Responses models 📚 openai.github.io/openai-agents-…

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OpenAI Developers@OpenAIDevs · Jun 3

The Agents SDK is now available in TypeScript and supports handoffs, guardrails, tracing, MCP, and other core agent primitives, just like the Python version. openai.github.io/openai-agents-…

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ilan bigio@ilanbigio · May 15

we're kicking off this year's @openai build hours! our first one – agentic tool calling, where i'll go over - CoT tool calling with o3 & o4-mini - long-horizon tasks - evaluating agentic tasks build hours are code-focused and practical, highly recommend. tune in on thursday!

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Kazuhiro Sera@seratch · Apr 24

Me working so hard in Japan 🇯🇵

OOpenAI Developers@OpenAIDevs · Apr 23

We'll turn 25 of your image generations into real stickers! 🌠 1. Start with this prompt in the Playground: platform.openai.com/playground/ima… 2. Make a creative, sticker-worthy design. 3. Quote this tweet with your image by the end of the week. 4. We'll pick 25 of the most creative…

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OpenAI@OpenAI · Apr 16

Livestream in o3 hours.

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OpenAI@OpenAI · Apr 14

developers 🤝 supermassive black hole livestream 10am PT

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Kazuhiro Sera@seratch · Apr 12

.@SlackAPI Congrats on (finally) open-sourcing the Slack CLI at github.com/slackapi/slack… 👏👏👏

seratch's tweet card. Create, develop, and deploy Slack apps from the command-line ✨ - slackapi/slack-cli

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OpenAI Developers@OpenAIDevs · Apr 12

Thanks to everyone who joined our first Developer Listening Session in SF! It was inspiring to see the community come together to help shape our approach to the next open model. Your feedback is invaluable—more to come soon!

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Kazuhiro Sera@seratch · Apr 9

Multimodal agents are now easier to build with the Agents SDK—voice included! Check out this new sample app from @dkundel and @seratch showing how to quickly integrate real-time audio into your agents.

ddominik kundel@DKundel · Apr 9

We published a new sample app for building multimodal agents with the @OpenAIDevs Agents SDK! github.com/openai/openai-… The repo shows you: 🤖 how to wrap your existing agents in a VoicePipeline 🎙️ capture/play audio in a React 🔌 send the audio between Python & your frontend

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Kazuhiro Sera@seratch · Apr 9

🇯🇵 OpenAI Agents SDK documentation is now available in Japanese: openai.github.io/openai-agents-… The entire content has been auto-translated using a script powered by OpenAI's gpt-4.5 model. If you're interested in how I've been creative with this, check out my PR! 😉

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Sam Altman@sama · Mar 31

TL;DR: we are excited to release a powerful new open-weight language model with reasoning in the coming months, and we want to talk to devs about how to make it maximally useful: openai.com/open-model-fee… we are excited to make this a very, very good model! __ we are planning to…

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Kazuhiro Sera@seratch · Mar 27

🧑‍💻 If you're looking for code snippets to run OpenAI's Agents SDK along with multiple MCP servers, this code snippet (w/ filesystem & slack) might be helpful. dev.to/seratch/openai… #OpenAI #AgentsSDK #MCP

seratch's tweet card. OpenAI Agents SDK (Python) now supports Model Context Protocol (MCP) servers as tools! The...

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OpenAI@OpenAI · Mar 25

4o image generation has arrived. It's beginning to roll out today in ChatGPT and Sora to all Plus, Pro, Team, and Free users.

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OpenAI Developers@OpenAIDevs · Mar 11

We're launching new tools to help developers build reliable and powerful AI agents. 🤖🔧 Timestamps: 01:54 Web search 02:41 File search 03:22 Computer use 04:07 Responses API 10:17 Agents SDK

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Kazuhiro Sera@seratch · Mar 10

Now I'm back to life, meeting many devs and hearing what they think and feel every day. In-person convos are valuable for understanding reality and engaging yourself!

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Romain Huet@romainhuet · Mar 7

A great developer experience is a constellation of details—and for @OpenAI, it starts with making it easy to discover and choose the right model. We’ve redesigned our docs so you can now quickly see and compare model capabilities and pricing at a glance.

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Kazuhiro Sera@seratch · Feb 25

Resolved a minor bug on Langfuse Python SDK; thanks for merging it! github.com/langfuse/langf…

seratch's tweet card. When store=True is passed to the chat.completions.create API, the metadata parameter is optional. In this case, the updated line of code fails to set an empty dictionary to self.kwargs["me...

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