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Add JSONL output format instructions function #24

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bc8063c
Add JSONL output format instructions function
vishnumallela Jan 18, 2026
def8b52
Fix typo in function name for output instructions
vishnumallela Jan 18, 2026
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34 changes: 33 additions & 1 deletion packages/core/src/catalog.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -222,6 +222,37 @@ export function createCatalog<
};
}



/**
* Generate JSONL output format instructions
*/
export function generateOutputFormatInstructions(): string {
return `## Output Format

Wrap your JSONL output in a code block:
\`\`\`jsonl
{"op":"set","path":"/root","value":"root-key"}
{"op":"add","path":"/elements/key","value":{"key":"...","type":"...","props":{...},"children":[...]}}
\`\`\`

No text before or after - ONLY the wrapped JSONL.

### Rules
1. First line sets /root to root element key
2. Add elements with /elements/{key}
3. Children array contains string keys, not objects
4. Parent first, then children
5. Each element needs: key, type, props

### Example
\`\`\`jsonl
{"op":"set","path":"/root","value":"main"}
{"op":"add","path":"/elements/main","value":{"key":"main","type":"Card","props":{"title":"Hello"},"children":[]}}
\`\`\`
`;
}

/**
* Generate a prompt for AI that describes the catalog
*/
Expand Down Expand Up @@ -284,7 +315,7 @@ export function generateCatalogPrompt<
}
lines.push("");

return lines.join("\n");
return lines.join("\n") + generateOutputFormatInstructions();
}

/**
Expand All @@ -295,3 +326,4 @@ export type InferCatalogComponentProps<
> = {
[K in keyof C["components"]]: z.infer<C["components"][K]["props"]>;
};