Generate preview rules from tool and stage declarations

Reuse the actual Schema and stage references to generate rules only for tools that are explicitly allowed to be displayed.

stage.preview='text' allows only text-only stages without toolIds; 'tools' handles only tools referenced by that stage with preview explicitly enabled. Arbitrary string fields are never guessed to be displayable body text.

tool.preview=true selects only paths actually declared in the Schema from common text/bubbles field conventions, with at least one present; custom paths are validated one by one, and when.path must also exist. Duplicate IDs, unknown references, or non-existent fields are rejected during assembly.

The returned rules are passed to the existing createReplyPreview. New stages or tools reuse catalog generation, avoiding transmitting one list and then hand-copying it for preview; preview still cannot authorize, persist the final reply, or execute tools.

Progressive examples for the same business case

Explicitly mark a text-only stage

Beginner · Node.js

TypeScript

import { Support } from '@jangts/agent-core';
const rules = Support.createReplyPreviewRules({ stages: [{ id: 'reply', preview: 'text' }], tools: [] });
const preview = Support.createReplyPreview({ rules, sink: bubbles => { console.log(bubbles); } });
console.log(typeof preview);

JavaScript

import { Support } from '@jangts/agent-core';
const rules = Support.createReplyPreviewRules({ stages: [{ id: 'reply', preview: 'text' }], tools: [] });
const preview = Support.createReplyPreview({ rules, sink: bubbles => { console.log(bubbles); } });
console.log(typeof preview);

Reuse the Schema and stage references of structured tools

Configuration · Node.js

A real App should project these two arrays from the tools and stage declarations it has already registered; this example uses minimal static data to show the required fields.

TypeScript

import { Support } from '@jangts/agent-core';
const tools = [{ id: 'reply', jsonSchema: { type: 'object', properties: { answer: { type: 'string' } } },
  preview: { paths: [['answer']] } }];
const rules = Support.createReplyPreviewRules({
  stages: [{ id: 'respond', toolIds: ['reply'], preview: 'tools' }], tools,
});
const preview = Support.createReplyPreview({ rules, sink: bubbles => { console.log(bubbles); } });
console.log(rules, typeof preview);

JavaScript

import { Support } from '@jangts/agent-core';
const tools = [{ id: 'reply', jsonSchema: { type: 'object', properties: { answer: { type: 'string' } } },
        preview: { paths: [['answer']] } }];
const rules = Support.createReplyPreviewRules({
    stages: [{ id: 'respond', toolIds: ['reply'], preview: 'tools' }], tools,
});
const preview = Support.createReplyPreview({ rules, sink: bubbles => { console.log(bubbles); } });
console.log(rules, typeof preview);

Policies & implementations

• Schema field verification and explicit preview scope