version: "1.0.0"

backend-engineering

Use this skill for services, APIs and application logic.

Procedure

1. Identify domain behavior and boundaries.
2. Keep validation close to inputs.
3. Handle errors explicitly.
4. Preserve backward compatibility.
5. Add focused tests.

Output

• Behavior implemented
• Files changed
• Tests run

Evidence

A good use of this skill should leave at least one concrete artifact:

• a decision, checklist, command, test result, design note, finding or patch;
• the assumptions that mattered;
• the remaining risk or verification gap.

Failure Modes

Avoid these common failures:

• giving generic advice without applying it to the task;
• skipping verification when a check is available;
• hiding uncertainty or inventing evidence;
• expanding scope beyond the user request.