CPY-020 Hard constraint layer: content_system

Optimize downstream value, not click alone

IF a variant increases clicks but lowers qualified action, retention, revenue quality, or trust, THEN reject or segment it ELSE retain.

Why the rule exists

A local metric can improve while the business and reader outcome degrades.

Condition

The rule fires when this evaluates true. Paths marked below must be present in the fact base; the engine reports the rest rather than guessing them.

ALL
- experiment.click_rate_change gt 0
- ANY
  - experiment.qualified_action_change lt 0
  - experiment.retention_change lt 0
  - experiment.revenue_quality_change lt 0
  - experiment.trust_signal_change lt 0

Facts this rule reads

Fact paths read by CPY-020 and whether the analyser derives them
Path	Source
`experiment.click_rate_change`	You supply it
`experiment.qualified_action_change`	You supply it
`experiment.retention_change`	You supply it
`experiment.revenue_quality_change`	You supply it
`experiment.trust_signal_change`	You supply it

Then

reject_or_segment — target experiment.variant

Else

retain — target current_text, No triggering condition is present.

LAKA

Smallest sufficient intervention

Yes

Primary axes

Sources

Scientific Advertising — Claude C. Hopkins
Testing, measurement, offers, and accountable advertising.
Influence: The Psychology of Persuasion — Robert B. Cialdini
Evidence-based principles of influence and ethical persuasion.

The raw rule record

Verbatim from 16-copywriting-rules.json. Also available at /v1/rules/CPY-020.

{
  "id": "CPY-020",
  "name": "Optimize downstream value, not click alone",
  "domain": "copywriting",
  "layer": "content_system",
  "strength": "hard_constraint",
  "human_logic": "IF a variant increases clicks but lowers qualified action, retention, revenue quality, or trust, THEN reject or segment it ELSE retain.",
  "when": {
    "all": [
      {
        "path": "experiment.click_rate_change",
        "operator": "gt",
        "value": 0
      },
      {
        "any": [
          {
            "path": "experiment.qualified_action_change",
            "operator": "lt",
            "value": 0
          },
          {
            "path": "experiment.retention_change",
            "operator": "lt",
            "value": 0
          },
          {
            "path": "experiment.revenue_quality_change",
            "operator": "lt",
            "value": 0
          },
          {
            "path": "experiment.trust_signal_change",
            "operator": "lt",
            "value": 0
          }
        ]
      }
    ]
  },
  "then": [
    {
      "action": "reject_or_segment",
      "target": "experiment.variant"
    }
  ],
  "else": [
    {
      "action": "retain",
      "target": "current_text",
      "reason": "No triggering condition is present."
    }
  ],
  "unless": [],
  "because": "A local metric can improve while the business and reader outcome degrades.",
  "diagnostics": [],
  "examples": {},
  "source_ids": [
    "BK-033",
    "BK-035"
  ],
  "laka": {
    "smallest_sufficient_intervention": true,
    "primary_axes": [
      "scope",
      "depth",
      "magnitude",
      "reversibility"
    ]
  }
}