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The persona parameter controls the base personality of every completion. An E.V.I. (Embedded Virtual Intelligence) is a pre-configured Theo client with a custom persona, skills, and tools baked in — your users interact with your brand, not Theo.

Persona Options

E.V.I. — The SDK Shortcut

Instead of passing persona, skills, and tools on every request, create an E.V.I. instance:

Three Levels

  1. Persona only — Replace Theo’s voice with your brand
  2. Persona + Skills — Add domain expertise (inventory, compliance, etc.)
  3. Persona + Skills + Inline Tools — Connect Theo to your product’s actions
See the full E.V.I. Guide for detailed examples of each level.

E.V.I. Canvas — The Visual Builder

Prefer a visual approach? The E.V.I. Canvas is a drag-and-drop skill builder in the dashboard. Design node graphs with prompts, models, tools, knowledge, vision, and conditions — then compile, test, and publish without writing a manifest. See the Canvas Guide and Canvas SDK Reference.