🚫
AB-046
Structured 404 Errors
🏗️ Infrastructure
Pillar: Verifiability
Quick fix
Severity: medium
Est. cost: $0
Gap: semantic
Fix: assisted
What it means
Your site returns structured JSON for 404 errors instead of plain HTML.
Why it matters
When agents hit a missing page, a structured error tells them what went wrong. An HTML 404 page is useless to machines.
Evidence expected
This rule is verified by:
http Source: Runtime probe
✗
What's wrong
404 returns an HTML page. Agents can't parse the error.
✓
What's right
404 returns structured JSON with error details agents can understand.
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Machine-Readable
This rule is also available as JSON: /rules/AB-046.json
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