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Instead of creating entity files by hand, use the interactive scaffolder: 
yarn twenty dev:add
It prompts you to pick an entity type and walks you through the required fields, then writes a ready-to-use file with a stable universalIdentifier and the correct defineEntity() call. You can also pass the entity type directly to skip the first prompt: 
yarn twenty dev:add object
yarn twenty dev:add logicFunction
yarn twenty dev:add frontComponent

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Available entity types

Entity typeCommandGenerated file
Objectyarn twenty dev:add objectsrc/objects/<name>.ts
Fieldyarn twenty dev:add fieldsrc/fields/<name>.ts
Logic functionyarn twenty dev:add logicFunctionsrc/logic-functions/<name>.ts
Front componentyarn twenty dev:add frontComponentsrc/front-components/<name>.tsx
Roleyarn twenty dev:add rolesrc/roles/<name>.ts
Skillyarn twenty dev:add skillsrc/skills/<name>.ts
Agentyarn twenty dev:add agentsrc/agents/<name>.ts
Viewyarn twenty dev:add viewsrc/views/<name>.ts
Navigation menu itemyarn twenty dev:add navigationMenuItemsrc/navigation-menu-items/<name>.ts
Page layoutyarn twenty dev:add pageLayoutsrc/page-layouts/<name>.ts

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What the scaffolder generates

Each entity type has its own template. For example, yarn twenty dev:add object asks for:
  1. Name (singular) — e.g., invoice
  2. Name (plural) — e.g., invoices
  3. Label (singular) — auto-populated from the name (e.g., Invoice)
  4. Label (plural) — auto-populated (e.g., Invoices)
  5. Create a view and navigation item? — if you answer yes, the scaffolder also generates a matching view and sidebar link for the new object.
Other entity types have simpler prompts — most only ask for a name. The field entity type is more detailed: it asks for the field name, label, type (from a list of all available field types like TEXT, NUMBER, SELECT, RELATION, etc.), and the target object’s universalIdentifier.

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Custom output path

Use the --path flag to place the generated file in a custom location: 
yarn twenty dev:add logicFunction --path src/custom-folder