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wyndham-ARR/.project-docs/60-reflection/cases/2026-07-29-internal-parameters-are-not-user-inputs.md
2026-07-29 16:38:05 +08:00

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# Reflection: Internal Parameters Are Not User Inputs
## Trigger
The user corrected two successive workflow descriptions: first, year/month/cutoff values were incorrectly treated as user submissions; then a monthly-report button was still incorrectly retained as a separate user action.
## Expected Behavior
Trace the complete business event chain before designing the interaction boundary: XML upload → Agent structured result → successful database commit → automatic monthly-report dispatch.
## Actual Behavior
Internal `RunRequest` fields and an existing manual endpoint were mistaken for the intended user workflow.
## Root Cause
- Unclear ownership
- Stale docs
- Conflation of an internal execution contract with a user-facing product contract
## Evidence
- Files: `.planning/monthly_reports_database_audit/findings.md`, `arr_web/app.py`, `arr_web/static/app.js`
- Session/thread: user correction on 2026-07-29
- Docs involved: ADR-001 and `.project-docs/40-domain/business-rules.md`
## Lesson
When a report program accepts year, month, or as-of values internally, do not infer that a person supplies them. Establish who initiates the business event, where values are derived, and which boundary owns the trigger before proposing UI or API behavior.
## Action
- Update docs
- Add the confirmed boundary to the durable business rules and architecture decision.
## Promotion
Promoted to ADR-001, the business-rules document, architecture data flow, and stale-item tracking.