Renderer - Custom Actions

Custom actions let you implement complex interaction logic. Pair them with prompts so the LLM emits schema JSON that invokes those actions.

Passing customActions to the Renderer

Pass actions via the customActions prop. Each action includes:

• name: Action name
• description: Action description
• execute: Handler receiving params and context
• parameters: Optional parameter schema; the model uses it to fill params for execute

execute Parameters

• params: Arguments passed when the action is invoked
• context: Renderer context (state and methods); use context.state for two-way bound global state

Example: Open a Page

Send Custom Actions to the Server

After registering actions on the renderer, include them in chat requests so the model can generate correct action calls.

const response = await fetch(url, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    messages: [{ role: 'user', content: userInput }],
    model: 'deepseek-v3.2',
    stream: true,
    metadata: {
      tinygenui: JSON.stringify({
        framework: 'Angular',
        customActions: [
          {
            name: 'openPage',
            description: 'Open a page',
            parameters: {
              type: 'object',
              properties: {
                url: {
                  type: 'string',
                  description: 'URL to open',
                },
                target: {
                  type: 'string',
                  description: 'Target window: _self (same tab) or _blank (new tab)',
                },
              },
              required: ['url', 'target'],
            },
          }
        ]
      }),
    },
  }),
});