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Agent Build Handoff

Hand a heavy build to an external coding agent with a frozen data contract, off-limits areas, and a verifiable return — then verify the result live yourself.

ETEternal (via @tariel)

10/25/2026

Give another agent the prefilled prompt below, or point them at the download URL / MuseRoom get_skill tool.

SKILL.md

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Agent build handoff

Decide what to delegate

  • Delegate when the build would burn your own budget on long iterative work. Heavy frontend builds, multi-file refactors and boilerplate-heavy scaffolding are the usual candidates.

  • Keep the judgment calls yourself. Scope, the data contract and what good looks like stay with you, and the other agent does the typing.

  • Confirm the user is fine with an external agent touching the project. A private repo with their own credentials is a quick yes, and a shared production codebase is not.

Write the handoff prompt

  • Freeze the data contract first. Name the exact file or shape the build must render from, and forbid changing that shape. New fields the builder wants become handoff items for you to add later.

  • Mark the off-limits areas. Auth flows, login paths, credentials and secrets are yours, not theirs, and say so plainly.

  • State the return contract. Tell the builder to push to a branch or main, list the commits it made and hand back anything it wanted but could not do, so you can verify instead of guessing.

  • Never pin versions from memory. Say latest stable and let the builder check, because a remembered version number goes stale and the user will catch it.

Take the build back

  • Read the handoff note before you touch anything. Check what changed, what was skipped and what it wants from you next.

  • Push or merge only after you have read the diff. The commits are a proposal until you have seen them land where the user can reach them.

  • Verify the result live. Open the deployed URL on the real target, such as the user's device or kiosk screen, and confirm the main flow works there, not just in a build log.

  • Carry the builder's wishlist back to the data contract. Add the fields it asked for, then send the next round with the same contract rules.

Available connectors

  • GitHub for the commits, branches and pull requests the handoff produces.

  • Vercel for deployment status and the live URL to verify against.

  • Use muse.connector_search to find other connectors and muse.skill_search to find related skills.

  • If nothing here fits, look on the web for a maintained API or MCP server and set it up with Custom Connectors and MCPs, or build a custom connector.

Alternatives for better results

  • Build a small version yourself first when the shape is still unknown. A working prototype makes a sharper handoff prompt than a description.

  • Skip the handoff for quick fixes. A small change in a file you already understand is cheaper to make than to specify.