Mizuho launches an 'Agent Factory' to mass-produce and run AI agents
In plain words
Mizuho started an Agent Factory to move from building individual AI agents to producing and operating them at scale, and plans to roll the Cowork agent out to staff.
Still a trial: Programme launched; staff rollout targeted.
Source: prtimes.jp ↗
How to do it yourself
Our suggested steps. The company didn't publish theirs.
- 1
Create one template for every agent: purpose, inputs, outputs, data allowed, owner.
- 2
Build your first 3 agents from the template.
- 3
Keep a register (Google Sheet) of all agents and their owners.
- 4
Review each agent monthly: usage, errors, still needed?
- 5
Retire unused agents and copy the best ones for other teams.
The instructions to give the AI
Paste this into ChatGPT (the free plan is fine), swap the [brackets] for your details, and test it on a few real examples.
Agent instructions (prompt)
Help me design an AI agent for [team/task]. Produce: 1) one-sentence purpose, 2) inputs and where they come from, 3) step-by-step instructions the agent should follow, 4) output format, 5) data it must never use, 6) how a human checks its work, 7) a test case.
[Highlighted] = replace with your own details before you run it.
What you should get back: A one-page agent design: purpose, inputs, step-by-step instructions, guardrails and how to test it.
Written by Quickly and Good, inspired by this case.
More detail: tools, prices and what you'll need
The company used: Mizuho 'Agent Factory'
You could use: A shared agent library: Claude Projects or custom GPTs with a template and register
- ChatGPT
General AI assistant: writes, summarises and answers from files you give it.
Free plan; paid plans available · Official site ↗
- Claude
AI assistant for writing, analysis and long documents; can connect to your tools.
Free plan; Pro $20/mo (monthly) · Official site ↗
Prices from each tool's own pricing page, checked Oct 2026.
What you'll need
- ☐A ChatGPT or Claude account
- ☐Your own documents, templates or examples
- ☐The agent instructions (prompt)
- ☐A habit of checking every output before you use it
Can I do this myself?
Yes. You can try this today with a chat assistant and your own files.
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