Lists multiple specific concrete actions: 'exception handlers, structured error responses, async error patterns, and graceful shutdown' - these are distinct, actionable capabilities.

Clearly answers both what ('exception handlers, structured error responses, async error patterns, graceful shutdown') AND when ('Use when building or reviewing FastAPI backends, when you see unhandled exceptions returning raw 500s, or when error response formats are inconsistent').

Includes natural keywords users would say: 'FastAPI', 'exception handlers', 'error responses', 'unhandled exceptions', '500s', 'error response formats' - good coverage of terms developers naturally use when facing these issues.

Highly specific niche: FastAPI + production error handling. The combination of framework-specific focus and error handling domain creates clear boundaries unlikely to conflict with general Python skills or other web framework skills.

The content is lean and efficient, avoiding explanations of concepts Claude already knows (like what FastAPI is or how exceptions work). Every section provides actionable information without padding.

Provides fully executable, copy-paste ready code for error classes, exception handlers, route usage, and shutdown handling. Includes complete imports and realistic examples.

Clear 4-step sequence for adding error handling to an existing app, with explicit 'Why all three?' explanation serving as validation rationale. The 'Applying to Existing Code' section provides a clear checklist for retrofitting, and the final checklist serves as verification.

Content is well-structured with clear sections, but the skill is somewhat long (~150 lines) and could benefit from splitting the detailed handler explanations or the 'Applying to Existing Code' section into separate reference files. The verifiers section at the end references external files appropriately.