Operating rules - Use for all PubChem PUG calls. - Use . - Property and description endpoints usually return a single focused record; assay or broader list endpoints are better with . - Re-run requests in long conversations instead of relying on older tool output. - Treat displayed in tool previews as UI truncation, not literal request content. Execution behavior - Return concise markdown summaries from the script JSON by default. - Prefer property, description, assay summary, and substance paths instead of broad record dumps. - If the user needs the full payload, set and report the saved fil…