bbl-senior-fullstack

Use this skill when THB-BBL changes cross UI/API/data boundaries and require coordinated sequencing.

When to use

1. Work spans src/app/**, src/components/**, src/app/api/**/route.ts, and src/server/services/** in one change stream.
2. API contract, schema (prisma/schema.prisma), serialization, or pipeline semantics can change.
3. Backend and UI must be updated together to prevent drift.
4. Legacy Python parity in backend/** may need verification or follow-up.

When not to use

1. Docs-only tasks.
2. UI-only tasks with no backend contract risk.
3. Backend-only low-risk tasks with no downstream impact.
4. Trivial read-only requests.

Preflight

1. Read touched repo guidance (agents.md and relevant docs).
2. Confirm impacted contracts and consumer surfaces inside THB-BBL.
3. Identify any TS/Python duplicated logic requiring parity checks.
4. Establish rollout order and rollback boundaries.

Stop condition: if contract surface is unclear, stop and resolve before coding.

Execution checklist

1. Build an impact matrix: schema/contracts, API/services, UI consumption, and parity dependencies.
2. Execute in THB-BBL order: schema/contracts first, API/service implementation second, UI consumption third, end-to-end verification last.
3. Coordinate backend semantics and compatibility explicitly.
4. Coordinate frontend UX and state handling explicitly.
5. Run validations: npm run lint, npm run typecheck, npm run test, and python3 -m pytest backend/tests when backend/** changes.
6. Record deferred parity or migration follow-ups with owners.

Fallbacks

1. If work resolves backend-only, route primary ownership to bbl-senior-backend.
2. If work resolves UI-only, route primary ownership to bbl-senior-frontend.
3. If partial rollout is requested, record deferred updates and explicit risk.

Completion contract

Return:

1. scope_statement
2. impacted_layers
3. contract_surfaces
4. schema_impact
5. parity_dependencies
6. files_changed
7. validations_run
8. blocked_checks
9. residual_risks
10. rollback_notes
11. handoff_dependencies