{"rule_id":"AB-018","category":"content_negotiation","icon":"⬇️","title":"Markdown Format Support","short_description":"Your site returns Markdown when an agent requests it.","user_value":"Markdown is the preferred format for many AI systems. Offering it makes your content easy to consume.","wrong_example":"No Markdown option. AI models have to convert from HTML, losing formatting.","right_example":"Markdown is available, preserving formatting for AI consumption.","effort_hint":"quick","estimated_cost":"$0","severity":"medium","pillar":"discovery","version":"1.0.0","counted_in_score":true,"check":{"type":"header_check","sources":["content_negotiation"],"target":"/"},"fix":{"eligible":true,"type":"assisted","note":"Add Accept header content negotiation to return text/markdown when requested"},"checklist_anchor":"#AB-018","checklist_url":"/agent-readiness-checklist#AB-018","html_url":"/rules/AB-018","json_url":"/rules/AB-018.json","related_rules":[{"rule_id":"AB-015","title":"Agent User-Agent Format","category":"content_negotiation"},{"rule_id":"AB-016","title":"JSON Format Support","category":"content_negotiation"},{"rule_id":"AB-017","title":"Plain Text Format Support","category":"content_negotiation"},{"rule_id":"AB-019","title":"Preferred Format Selection","category":"content_negotiation"},{"rule_id":"AB-028","title":"Vary Header","category":"content_negotiation"},{"rule_id":"AB-029","title":"No Redirect on Negotiation","category":"content_negotiation"}]}