Lean ~19-line overview with no conceptual padding; it assumes Claude's competence and defers detail to references, matching the 'lean and efficient; every token earns its place' anchor.

Provides concrete executable commands ('make openapi', 'make lint-python') and exact helper names plus path-format conventions, giving copy-paste-ready guidance rather than abstract direction.

A numbered pre-commit checklist with explicit sequence and verification checkpoints (regenerate via 'make openapi', then 'make lint-python'), matching the anchor for clear sequence with explicit validation steps.

Clear overview with a well-signaled one-level-deep reference table; all three referenced files (endpoint-patterns.md, openapi-codegen.md, testing-patterns.md) exist and are appropriately split from the overview.

Names concrete actions — 'adding, modifying, or reviewing endpoints' — within a specific domain (REST API development for Phoenix), matching the anchor for multiple specific concrete actions.

Explicitly answers both what ('REST API development for Phoenix') and when ('Use when adding, modifying, or reviewing endpoints'), satisfying the anchor for clearly answering both with explicit triggers.

Includes relevant natural terms ('endpoints', 'REST API', 'adding, modifying, or reviewing') but lacks broader common variations a user might say, so it sits at 'some relevant keywords but missing common variations' rather than full coverage.

Scoped to a concrete path 'src/phoenix/server/api/routers/v1/', giving it a clear niche unlikely to trigger for unrelated skills.