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Create UML diagrams with AI

1. Open your project in Astah and click the [Chat Copilot] tab.
2. Copy this prompt, edit the requirements, and send it:

   Read the requirements below and create a UML class diagram with the main classes, attributes,
   operations, relationships and multiplicities. Use English names.
   
   Requirements:
   - Members can borrow up to 5 books at a time.
   - Each book has an ISBN, a title and one or more authors.
   - A loan records the borrow date, the due date and the return date.
   - Members who return books late pay a fine.
   
   Model "up to 5 books" as a multiplicity. Do not create classes for basic types such as
   String or Date.

3. Review the diagram and ask for changes in the same conversation, for example:

   Add a Reservation class so that members can reserve books that are on loan.

You can also start from other diagrams: use case, sequence, activity, state machine and, in Astah Professional, ER diagrams. See the supported diagrams and the AI Chat Copilot guide.

Available with AI Chat Copilot in Astah Professional and Astah UML.

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Turn PlantUML into editable UML diagrams with AI

1. Ask your AI service for a diagram in PlantUML, or use PlantUML you already have:

   Write a PlantUML class diagram for a library system with Member, Book, Author and Loan.
   A member can borrow up to 5 books at a time.

2. In an AI client connected to Astah through the MCP server, such as Claude Code, import it and refine it in natural language:

   Import this PlantUML into Astah as a class diagram named "Library - Domain Model".
   Then add a Reservation class linked to Member and Book.

3. Edit the model by hand in Astah, for example add a class, an attribute or a relationship. When you need text again, for example for a document or a pull request, export it with your changes:

   Export the class diagram "Library - Domain Model" from Astah as PlantUML,
   including the changes I made by hand.

Supported for class, use case, sequence, activity and state machine diagrams. To import or export PlantUML without AI, use the PlantUML Plugin. For setup, see the MCP server guide.

Available with the MCP server in Astah Professional and Astah UML.

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See the structure and flow of existing code

1. In Astah, choose Tools > AI Code Reverse… and enter the folder that contains your source code in Target Directory.
2. For a class diagram, select Class Diagram, paste this prompt into User Prompt and click OK:

   Create a class diagram for the library package. Show the classes with their
   attributes, operations and relationships, including interfaces and inheritance.
   Do not create classes for built-in types such as str, date or list,
   and do not show constructors such as __init__.

3. For a sequence diagram, select Sequence Diagram, enter the method to start from in Entry Methods, and set Max Call Hierarchy Depth (a smaller value keeps the diagram easier to read). Then paste a prompt and click OK:

   Entry Methods:
   LibraryService.borrow_book(str, str, date)
   
   User Prompt:
   Create a sequence diagram for LibraryService.borrow_book(). Show the main successful flow:
   find the member and the book, check can_borrow() and is_available(), create the Loan and
   send the confirmation. Label every message and show return values as reply messages.

Supported languages include Java, C#, Python, TypeScript, Go, C++, JavaScript, Kotlin, Swift, PHP, Ruby, Rust and other languages. For details, see the AI Code Reverse guide.

Available with AI Code Reverse in Astah Professional and Astah UML.

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Review and document a design with AI

1. Open the diagram in Astah and click the [Chat Copilot] tab.
2. Ask for a review without changing the model:

   Review the class diagram "Library - Domain Model". List missing elements,
   unclear relationships and naming inconsistencies, most important first.
   Do not change the model yet.

3. Apply the suggestions you agree with, by number:

   Apply suggestions 2, 3 and 4.

4. Document the design for people who do not read UML:

   Add a note to the diagram that summarizes this model in plain language
   for team members who do not read UML.

Available with AI Chat Copilot or the MCP server in all four products.

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Create SysML diagrams with AI

1. Open your project in Astah SysML or Astah System Safety and click the [Chat Copilot] tab.
2. Copy your requirements from your specification or spreadsheet, including the header row. For example:

   ID	Name	Text	Derived from
   REQ-001	Autonomous Delivery	The robot shall deliver parcels to the recipient without human control.
   REQ-002	Payload Capacity	The robot shall carry a payload of up to 20 kg.	REQ-001
   REQ-011	Obstacle Detection	The robot shall detect obstacles within 5 m.	REQ-010
   REQ-012	Emergency Stop	The robot shall stop within 1 second after an obstacle is detected within 1 m.	REQ-011
   … 10 requirements in the example

3. Paste your requirements into this prompt and send it:

   Create a SysML requirement diagram from the requirements below.
   Use the ID, name and text of each row, and use the Derived from column
   for derive relationships. Show all relationships on the diagram.
   
   [Paste your requirements here, including the header row]

4. Create the system structure:

   Create a SysML block definition diagram for the delivery robot with the
   blocks DeliveryRobot, Chassis, DriveSystem, BatteryPack, CargoCompartment,
   NavigationController, Sensor and CommunicationModule. DeliveryRobot is
   composed of the other blocks.

5. Trace the requirements to the design:

   In the requirement diagram, add satisfy relationships from each block
   to the requirements it fulfills.

In version 11, AI Chat Copilot in Astah SysML and Astah System Safety works with SysML diagrams. See the supported diagrams.

Available with AI Chat Copilot in Astah SysML and Astah System Safety.

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