Incremental Implementation

Incremental Implementation (TypeScript API)

Overview

Implement API work in focused increments that can each be tested and validated before moving to the next slice.

When to Use

• Multi-step endpoint/service changes
• Work touching validation + business logic + persistence
• Changes where rollback/scope control matters

When NOT to Use

• Tiny one-line fixes with no meaningful branching/validation overhead

Inputs

• Requirements and acceptance intent
• Existing route/controller/service conventions
• Relevant test coverage baseline

Process

1. Confirm scope and assumptions.
2. Implement the smallest viable behavior slice.
3. Validate with tests/type checks.
4. Expand to next slice only after green verification.
5. Keep commits/files focused and traceable.

Verification Checklist

• Each slice has a clear observable outcome
• Tests cover changed behavior (happy + error path)
• Type safety remains strict
• No unrelated refactors were introduced

Failure Modes to Avoid

• Large multi-concern diffs in one pass
• Skipping intermediate verification
• Expanding scope opportunistically

Output Requirements

• Use summarize for final output.
• Describe completed slices and evidence run.
• Use canonical camelCase result fields.