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skills/api-design-standards/reference/error-handlers.md

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+# Error Handlers
+
+**Complete exception handler configuration.**
+
+See [../templates/error-handler.py](../templates/error-handler.py) for full implementation.
+
+```python
+async def http_exception_handler(request, exc):
+    return JSONResponse(status_code=exc.status_code, content={"error": exc.detail, "status_code": exc.status_code})
+
+async def validation_exception_handler(request, exc):
+    errors = [{"field": ".".join(str(loc) for loc in e["loc"]), "message": e["msg"], "code": e["type"]} for e in exc.errors()]
+    return JSONResponse(status_code=422, content={"error": "Validation error", "detail": errors, "status_code": 422})
+
+app.add_exception_handler(HTTPException, http_exception_handler)
+app.add_exception_handler(RequestValidationError, validation_exception_handler)
+```