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Yap Pat Yih runs his company’s AI-assisted work by separating planning from execution: a “Brain” session investigates and writes a brief, then a fresh “Hand” session follows that brief. The Brain makes decisions only when they belong to the owner; the Hand performs the assigned work and reports what it changed. Pat Yih describes the method as delegation applied to an AI tool, drawing on his experience as a general manager. His account is a personal report, not independent evidence that the workflow will produce the same results for every team.
What the Brain-and-Hand split means
The Brain and the Hand are roles, not necessarily different AI models. The Brain handles investigation, judgment and planning. It reads relevant sources and, for software work, inspects the repository without editing it. It proposes an approach, asks the owner numbered questions when a decision belongs to them, and then produces one self-contained brief.
The Hand begins in a fresh session with that brief. As Pat Yih puts it, “The Hand is a fresh session.” It carries out the instructions, checks the result in a browser when appropriate, commits after each step with a human-readable subject, and reports back in the format the brief specifies. In his workflow, it does not push, deploy or touch production unless the brief explicitly authorizes that action.
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How to set up the handoff
1. Let the Brain investigate without making changes
Give the Brain the relevant context and access needed to investigate. For a code task, that may include repository structure and project documentation. Ask it to identify constraints and propose a plan, but not to edit files. Keep owner-level decisions with the owner rather than inviting the Brain to silently guess.
2. Resolve open decisions before the brief is written
Ask the Brain to surface questions as a numbered list when a choice affects the intended result. Answer those questions before asking for the final brief. Pat Yih identifies unresolved decisions as a common failure point: an executor can make a reasonable choice that still turns out to be wrong for the owner.
3. Make the brief self-contained
Pat Yih’s outline gives the Hand enough to work from without needing the planning exchange. Include:
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- Where to work and what to read: identify the project area and relevant material.
- Boundaries: name prohibited actions, especially anything involving pushing, deployment or production.
- Purpose and context: explain what the work is meant to achieve.
- Standing project rules: include conventions the executor must follow.
- Numbered steps: make the implementation sequence clear.
- Report-back requirements: request a summary of changes, anything changed outside the request, and anything that could not be completed.
These reporting instructions make it easier to spot scope changes and incomplete work. They do not replace reviewing the result.
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4. Start the Hand in a fresh session
Paste in the final brief and let the Hand execute against it. A separate session is intended to prevent the planning conversation from becoming an implicit part of the execution instructions. The brief—not unstated assumptions from the Brain session—should define the task, boundaries and expected report.
5. Review the report before deciding what comes next
Read the Hand’s report, check the work and identify any newly surfaced constraint or changed requirement. Pat Yih describes the Brain reviewing the report before it issues another brief. If a decision or implementation plan changes, make that change explicit in the next handoff rather than treating the first brief as permanent.
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What Pat Yih says happened on a site rebuild
Pat Yih reports that a site rebuild took two days and involved one Brain session and six Hand sessions, with just over a hundred commits. He says the Brain wrote zero lines of code and that he reviewed six reports rather than a hundred commits. These are figures from his own account, not independently corroborated productivity measurements, so they describe his experience rather than a general expected outcome.
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An unresolved choice turns into an unwanted implementation
If the brief leaves a meaningful decision open, the Hand may choose a plausible option that does not match the owner’s preference. The remedy in Pat Yih’s approach is to have the Brain ask numbered questions before finalizing the brief, then carry the answers into the instructions.
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A technical constraint blocks the planned route
In one example, the Hand discovered that the hosting adapter could not build for the intended platform and stopped to ask what to do. That is a useful outcome when the limitation changes the available options: the executor reports the obstacle rather than inventing a workaround that exceeds its authority.
The owner changes the requirement
Pat Yih recounts changing his mind about a two-step sign-in, which led to a later brief with a revised implementation plan. He also describes revising a logo form after review. These examples show why the workflow allows iteration: a report can reveal a constraint or a review can expose a changed preference, and the next brief can reflect the new decision.
Why not plan and build in one session?
Pat Yih’s argument for separate sessions is about context and roles. In a single long session, planning and implementation happen in the same conversation. With a Brain-and-Hand handoff, the execution session starts fresh and receives a defined brief, including limits and reporting expectations. Pat Yih presents that separation as a way to make delegation clearer; his article does not establish an independently measured advantage over using one session.
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No. Pat Yih says he uses the same division for keyword research and content briefs: one session investigates and plans, and another executes the defined task. The pattern applies most naturally when work has a distinct planning stage, a concrete handoff and an output that can be reviewed. The brief should still state boundaries and what the executor must report, regardless of the task.
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