# ACTIVE: BDL-023 — C4 Architecture Diagrams

> **Last updated:** 2026-02-19
> **Phase:** COMPLETED

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## Summary

All 5 waves completed successfully. C4 architecture diagram support added to Beadloom.

## Progress

- [x] PRD.md created and approved
- [x] RFC.md created and approved
- [x] CONTEXT.md approved
- [x] PLAN.md approved (8 beads)
- [x] Wave 1: BEAD-01 — C4 level mapping (26 tests)
- [x] Wave 2: BEAD-02 — C4-Mermaid output (8 tests)
- [x] Wave 2: BEAD-03 — C4-PlantUML output
- [x] Wave 2: BEAD-04 — C4 level selection (20 tests)
- [x] Wave 2: BEAD-05 — C4 external systems (25+ tests)
- [x] Wave 3: BEAD-06 — Test review (+45 tests, 99.7% coverage)
- [x] Wave 4: BEAD-07 — Code review (0 critical, 3 minor fixed)
- [x] Wave 5: BEAD-08 — Documentation update (sync-check: 0 stale)

## Results

| Bead | Agent | Status | Details |
|------|-------|--------|---------|
| BEAD-01 | /dev | **Completed** | C4Node, C4Relationship, map_to_c4() |
| BEAD-02 | /dev | **Completed** | render_c4_mermaid() + CLI --format=c4 |
| BEAD-03 | /dev | **Completed** | render_c4_plantuml() + CLI --format=c4-plantuml |
| BEAD-04 | /dev | **Completed** | filter_c4_nodes() + CLI --level/--scope |
| BEAD-05 | /dev | **Completed** | External/database node rendering |
| BEAD-06 | /test | **Completed** | 134 tests, 99.7% coverage |
| BEAD-07 | /review | **Completed** | Review OK (4 minor, all fixed) |
| BEAD-08 | /tech-writer | **Completed** | Docs updated, sync-check clean |

## Final Metrics

- Tests: 1791 passed (134 C4-specific)
- Coverage: 99.7% for graph/c4.py
- ruff: clean
- mypy: clean
- beadloom sync-check: 0 stale
- beadloom lint --strict: 0 violations
