Block Composer

In short

• What it is: The Block Composer (formerly Jestor Builder) is Jestor's built-in AI assistant for creating tools.
• What you can do: build apps using Jestor's native no-code components, so everything it creates can be edited later in the no-code builder; create tables with fields (text, number, date, select, connected records, and others); create kanban views grouped by any select field.
• How to start: From the Create window or AI Chats: press C (or click Create in the left menu), click the + button in the chat field and, under Agents, select Block Composer.
• Keep in mind: Automations are not supported.

What is it

The Block Composer (formerly Jestor Builder) is Jestor's built-in AI assistant for creating tools. Instead of configuring tables and apps manually from scratch, you describe your process or goal in a text field, and the AI builds it using the same no-code components you would use by hand: tables and fields, kanban views, forms and app page blocks.

Because everything is made from native Jestor no-code components, the result is a regular Jestor structure. You can open any table, view or page it created and keep editing it in the no-code builder, without writing code and without depending on the AI.

Capabilities

• Build apps using Jestor's native no-code components, so everything it creates can be edited later in the no-code builder
• Create tables with fields (text, number, date, select, connected records, and others)
• Create kanban views grouped by any select field
• Create forms for data entry, including file upload fields
• Create app pages combining views, forms, and layouts
• Build full apps with multiple pages and connected tables
• Modify existing structures: add fields, create new views, or restructure an app page through follow-up messages in the same chat

When to use

Use the Block Composer when you want to:

Start a new process from scratch and aren't sure how to structure it
Quickly prototype a table or app before refining the details manually
Create a kanban, form, or app page without going through each configuration step
Reduce setup time on repetitive structures like CRMs, task boards, or approval flows.

How to access

From the Create window or AI Chats: press C (or click Create in the left menu), click the + button in the chat field and, under Agents, select Block Composer.

From anywhere in the platform (Build mode):

Make sure you are in Build mode: look for the Build button in the top bar and confirm it is active (highlighted in orange).

Once in Build mode, the icon will appear next to Build button in the top right corner.
Click it to open the Block Composer chat panel on the right side of the screen.
Type your request in the input field at the bottom of the panel and press Enter.
The agent will process your request (you'll see a "Thinking…" indicator) and build the requested structure.

How to use

After opening the Block Composer, describe what you want to build in natural language. Be as specific as possible about your process, the fields you need, and how data should be organized.
Examples of what you can ask:

• "Create an opportunities table with 3 stages and a kanban view"
• "Build a simple CRM with companies, contacts, and a pipeline"
• "Create an onboarding form for new clients with name, email, and document upload"
• "Build a task management app with a kanban grouped by status and a form to add tasks"

After sending your message, the Block Composer will generate the structure. You can continue the conversation in the same chat panel to request adjustments.

Keep in Mind

• Automations are not supported. The Block Composer cannot create or configure automations. Set them up with Jestor's no-code automations or with the MCP.
• Review the generated structure before using it in production. The Block Composer creates a starting point: field types, names, and relationships may need manual adjustments.
• The Builder icon only appears when Build mode is active. If you don't see it, check that the Build toggle in the top bar is turned on.
• The Block Composer chat is not the same as a general support chat. It is specifically for building and modifying tools within your workspace.

FAQ

1. What is the difference between the Block Composer on the home page and the Block Composer panel?

They are the same AI. The home page shows a simplified entry point; the Block Composer panel (accessed via the pencil icon in Build mode) opens a full chat interface where you can continue a conversation, request changes, and build iteratively.

2. Can the Block Composer modify an existing table or app?

Yes. You can open the Block Composer panel while viewing an existing structure and ask it to make changes, such as adding a field, creating a new view, or restructuring an app page.

3. Can the Block Composer create automations?

No. Automations are created with Jestor's no-code automations or with the MCP. Build your table and app structure with the Block Composer first, then add the automations.

4. Builder icon isn't showing up. What do I do?

Make sure you are in Build mode. Click the Build button in the top bar to activate it. Once Build mode is on, the icon will appear next to Builder mode button.

5. How specific should my description be?

The more detail you provide, the closer the result will be to what you need. Mention the number of stages, the types of fields, and the views you want (kanban, form, app). You can always refine the structure with follow-up messages in the same chat.