Vertical Slice

1. Read-Side Query Slice

Use for list, details, search, filters, and similar read-only flows.

• add or extend the native application facade
• keep domain and repository boundaries clean unless a new contract is genuinely required
• add or extend protobuf request/response messages in proto/
• extend native proto mapping
• extend the native protobuf service adapter
• extend pipe transport method registration and request dispatch
• run scripts/ValidateProto.ps1 when proto/ changes
• add or extend the C# pipe method enum, client, service, and mapper
• add or extend the C# ViewModel / UI binding
• add unit tests for local logic
• add an integration test for the IPC boundary
• update docs according to AGENTS.md document-maintenance policy

2. Mutation / Use-Case Slice

Use for import, delete, export, conversion, and any state-changing flow.

Apply the read-side checklist plus:

• staging before commit — no partial visible success
• rollback / failure semantics are explicit and tested
• cancellation is a distinct outcome, not a silent fallback
• cleanup of stale temp state is handled
• logging covers long-running work and failure paths
• docs/Librova-Product.md updated if user-facing behavior changed
• docs/ReleaseChecklist.md updated if the UI workflow changed

3. Transport Contract Change Slice

If the slice is primarily transport work, use $transport-rpc for the ordered IPC checklist and come back here only for the surrounding feature wiring.

4. UI Shell Workflow Slice

Use for a new section, dialog, settings panel, or first-run flow.

• dialog abstraction behind an interface where platform UI would otherwise be hard to test
• ViewModel logic covered by unit tests
• shell composition test for the new workflow
• docs/ReleaseChecklist.md updated if the UI workflow changed
• UI labels in English exactly as they appear in the source

5. Close-Out

Before marking the task done:

• build and test validation complete — follow the checklist in $review-pass §8
• docs updated per AGENTS.md document-maintenance policy
• backlog item closed using $backlog-update
• no decorative tests added
• no commit made unless explicitly requested