---
phase: 19-ship-examples-and-playwright-e2e
plan: 01
subsystem: examples
tags: [chart.js, rusqlite, chinook, sqlite, justfile, mcp-apps, widget]

# Dependency graph
requires:
  - phase: 17-mcp-apps-runtime
    provides: WidgetDir, ChatGptAdapter, UIAdapter, StreamableHttpServer patterns
  - phase: 18-publishing-pipeline
    provides: Landing page mock bridge pattern, mock-data convention
provides:
  - Three standalone MCP App examples (chess, map, dataviz) that compile and run
  - Data visualization example with Chinook SQLite (execute_query, list_tables, describe_table tools)
  - Chart.js dashboard widget with contractual E2E element IDs
  - Justfile with run-chess, run-map, run-dataviz, test-e2e recipes
  - mcp-e2e-tests placeholder crate in workspace
affects: [19-02 E2E test crate, landing page mock bridge]

# Tech tracking
tech-stack:
  added: [rusqlite, chart.js-v4, just]
  patterns: [chinook-sql-explorer, standalone-example-convention, justfile-recipes]

key-files:
  created:
    - examples/mcp-apps-dataviz/Cargo.toml
    - examples/mcp-apps-dataviz/src/main.rs
    - examples/mcp-apps-dataviz/widgets/dashboard.html
    - examples/mcp-apps-dataviz/mock-data/sample.json
    - examples/mcp-apps-dataviz/README.md
    - crates/mcp-e2e-tests/Cargo.toml
    - crates/mcp-e2e-tests/src/lib.rs
    - justfile
  modified:
    - Cargo.toml

key-decisions:
  - "Data viz example uses rusqlite with bundled feature for zero-config SQLite compilation"
  - "Dashboard widget uses Chart.js v4 from CDN (no build step, ~200KB)"
  - "Contractual element IDs (chart, chartType, dataTable, queryInput, runQueryBtn, loading) for E2E test stability"
  - "Examples stay in workspace exclude list (standalone builds per RESEARCH.md Pitfall 3)"

patterns-established:
  - "Chinook SQLite Explorer pattern: open_db() with helpful download instructions on missing file"
  - "SQL injection prevention: validate table names with alphanumeric-only check before PRAGMA"
  - "Justfile convention: run-{name} for examples, test-e2e-{name} for targeted E2E tests"

requirements-completed: [SHIP-01, SHIP-02]

# Metrics
duration: 4min
completed: 2026-02-26
---

# Phase 19 Plan 01: Ship Examples and Justfile Summary

**Three standalone MCP App examples (chess, map, data viz) compile independently, with Chart.js Chinook dashboard widget, justfile recipes, and mcp-e2e-tests placeholder crate**

## Performance

- **Duration:** 4 min
- **Started:** 2026-02-26T19:14:26Z
- **Completed:** 2026-02-26T19:18:46Z
- **Tasks:** 2
- **Files modified:** 9

## Accomplishments
- Created data visualization MCP App example with Chinook SQLite Explorer (execute_query, list_tables, describe_table tools)
- Built interactive Chart.js dashboard widget with bar/line/pie charts, sortable data table, and table browser
- Removed legacy files (tests/playwright/, singular widget/ directories) and created justfile with all required recipes
- Prepared workspace for E2E test crate (mcp-e2e-tests placeholder compiles)

## Task Commits

Each task was committed atomically:

1. **Task 1: Create data visualization MCP App example** - `8b86dd0` (feat)
2. **Task 2: Clean up legacy files, update workspace, and create justfile** - `dec4093` (chore)

## Files Created/Modified
- `examples/mcp-apps-dataviz/Cargo.toml` - Standalone example crate with rusqlite dependency
- `examples/mcp-apps-dataviz/src/main.rs` - Chinook SQLite Explorer MCP server with three tools
- `examples/mcp-apps-dataviz/widgets/dashboard.html` - Interactive Chart.js dashboard with contractual E2E IDs
- `examples/mcp-apps-dataviz/mock-data/sample.json` - Canned query results for landing page mock bridge
- `examples/mcp-apps-dataviz/README.md` - Setup and usage instructions
- `crates/mcp-e2e-tests/Cargo.toml` - E2E test crate placeholder
- `crates/mcp-e2e-tests/src/lib.rs` - E2E test crate placeholder lib
- `justfile` - Workspace-root recipes for running examples and tests
- `Cargo.toml` - Updated workspace members (mcp-e2e-tests) and exclude (mcp-apps-dataviz)

## Decisions Made
- Used rusqlite with `bundled` feature for zero-config SQLite compilation (no system library needed)
- Chart.js v4 loaded from CDN -- no build step, lightweight (~200KB)
- Contractual element IDs established for E2E test stability across plan 19-01 and 19-02
- Examples remain in workspace exclude list (standalone builds avoid feature unification conflicts per RESEARCH.md Pitfall 3)
- Table name validation uses alphanumeric-only check to prevent SQL injection via PRAGMA

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Added mcp-apps-dataviz to workspace exclude early**
- **Found during:** Task 1 (cargo check for dataviz example)
- **Issue:** Dataviz example could not compile because Cargo detected it was inside the workspace but not a member
- **Fix:** Added `examples/mcp-apps-dataviz` to workspace exclude list in Task 1 instead of Task 2
- **Files modified:** Cargo.toml
- **Verification:** `cargo check` in dataviz directory succeeds
- **Committed in:** 8b86dd0 (Task 1 commit)

---

**Total deviations:** 1 auto-fixed (1 blocking)
**Impact on plan:** Pulled one workspace config change from Task 2 into Task 1 to unblock compilation. No scope creep.

## Issues Encountered
None -- all three examples compile cleanly, justfile recipes list correctly, mcp-e2e-tests placeholder compiles.

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- All three MCP App examples ready for E2E testing (plan 19-02)
- mcp-e2e-tests crate placeholder ready for chromiumoxide integration
- Justfile recipes ready for developer use
- Data viz example needs Chinook.db download for runtime (documented in README)

## Self-Check: PASSED

All 8 created files verified on disk. Both task commits (8b86dd0, dec4093) found in git log.

---
*Phase: 19-ship-examples-and-playwright-e2e*
*Completed: 2026-02-26*
