| name | implement-spf-feature |
| description | Implement an SPF feature from its registry entry. Use when an engine capability spans behaviors and requires tests plus status updates. |
Implement an SPF feature
Read references/workflow.md completely before acting; it contains the detailed disambiguation, planning, implementation, testing, and registry-update workflow.
Treat the feature entry as planning input. Reconcile it with code, tests, conventions, and requested scope before editing.
- Read the entry, related features, implementation, tests, and applicable SPF conventions.
- List contradictions, open decisions, and out-of-scope capability.
- Define the smallest end-to-end increment with observable value and split it into testable state, behavior, composition, adapter, and documentation chunks.
- For each chunk, add or update a failing test, implement the minimum at the correct ownership layer, and run the narrow target.
- Run cumulative SPF tests, build, and size checks proportional to impact.
- Collapse the feature record to final decisions, remaining scope, and current source pointers.
Report implemented and deferred scope, test evidence, record updates, and remaining risks. Do not claim completion for a prerequisite or partial increment.
Example
Input: “Implement the smallest useful increment of timeline discontinuity support.”
Output: The smallest end-to-end capability, test evidence, proportional checks, updated feature status, and explicit deferred scope.
