lens-chart — BI & Analytics Chart Selection

Follow the output format defined in docs/output-kit.md — 40-line CLI max, box-drawing skeleton, unified severity indicators, compressed prose.

When to use

User needs chart type selection or visualization recommendations for analytics dashboards or BI contexts.

Workflow

1. Identify data type and BI context from user request (sales trends, cohort analysis, funnel, KPI comparison, etc.)
2. Search chart knowledge base:

   python3 -m lens_agent.uiux search --domain chart --query "{data_type}" --limit 3
   

3. Search style for BI context:

   python3 -m lens_agent.uiux search --domain style --query "{context}" --limit 2
   

4. Evaluate for BI requirements: data density, drill-down capability, real-time support, library recommendation
5. Output optimized for decision-making, not decoration

Output format

┌─ BI Chart Recommendation — {data_type} ─────────────────────────────┐
│ Chart type:        {chart_type}                                      │
│ Library:           {library}                                         │
│ Data density:      {density} (low / medium / high)                  │
│ Drill-down:        {drill_down} (yes / no / limited)                │
│ Real-time support: {real_time} (yes / no)                           │
│ Accessibility:     {grade}                                           │
├─ Decision test ─────────────────────────────────────────────────────┤
│ "Does this answer a decision?" → {yes_no}: {rationale}              │
└──────────────────────────────────────────────────────────────────────┘

Anti-patterns

• Never choose decorative over data-dense visualizations for BI contexts
• Never skip the "does this answer a decision?" test — every chart must justify its inclusion
• Never skip accessibility fallback for charts graded below AA
• Never recommend real-time charts without confirming the data pipeline supports streaming

Delivery

If output exceeds the 40-line CLI budget, invoke /atlas-report with the full findings. The HTML report is the output. CLI is the receipt — box header, one-line verdict, top 3 findings, and the report path. Never dump analysis to CLI.