Celest Agent Workbench Request preview

Agent Workbench by Celest

Make it yours.

Open a Microsoft 365 Copilot agent package, see what it contains, refine the instructions that matter, and review your changes before exporting the next version.

Request preview Watch the film

Available by preview invitation. Email [email protected] with the service you use, or read the first-use guide.

Agent Workbench by Celest with three colorful maker characters Make It Yours01:04 Watch on YouTube
01 Open the package02 Refine an instruction03 Review the change04 Export the next version

A focused package loop

Give your agent a clearer job.

Agent Workbench combines tools for building, evaluating, and repairing Microsoft 365 Copilot agents. This workflow starts with an app package: its agent definition, instructions, icons, and supporting files.

  1. 01 OPEN

    Start with the package you have.

    See your agent’s instructions, settings, and files together in Agent Canvas.

  2. 02 REFINE

    Make one focused edit.

    Change an instruction in place, then compare the source text with its readable preview.

  3. 03 REVIEW

    Check the working copy.

    Run the package check and read what it flags before you export.

  4. 04 EXPORT

    Download the next version.

    Export the updated package. Your original stays available.

Inside the workbench

Real package work, made easy to see.

Explore the Weekly Brief agent’s package, instruction editor, and review and export controls.

Agent Workbench package overview, focused on the Weekly Brief agent’s instructions
OpenSee the agent’s instructions and package details.View full screenshot
Agent Workbench instruction editor with source text and readable preview side by side
RefineEdit the instruction and read the preview.View full screenshot
Agent Workbench Review & export panel with a local package check and working-copy history
Review & exportCheck the working copy before exporting.View full screenshot

Actual Agent Workbench screens · Weekly Brief is a fictional example

Where the work lives

Work in the tools you already use.

Use Agent Workbench with Microsoft 365 Copilot or Copilot Cowork. Your preview invitation includes the setup steps for the service you use.

In the Copilot conversation

Microsoft 365 Copilot

Inspect and improve your agent alongside the Copilot conversation.

Read the Copilot guide
In a Cowork task

Copilot Cowork

Attach a package ZIP to a Copilot Cowork task to inspect, revise, and repair its files.

Read the Cowork guide
Your changesEasy to review

Review your changes before using the next version.

Your originalKept available

Work on the next version with the original package close by.

Your next testIn Microsoft 365

Package checks help you prepare. Test the updated agent in the Microsoft service where you will use it.

Your next move

Got an agent in mind?

Email [email protected] with the service you use and what you’re working on to ask about a preview invitation.

Request previewRead the first-use guide