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fix(traverse_lineage): return graceful message on 404 instead of raw error #215

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fix(traverse_lineage): return graceful message on 404 instead of raw error #215

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10 changes: 10 additions & 0 deletions modelcontextprotocol/tools/lineage.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
from typing import Dict, Any, List, Optional, Union

from client import get_atlan_client
from pyatlan.errors import NotFoundError
from pyatlan.model.enums import LineageDirection
from pyatlan.model.lineage import FluentLineage
from pyatlan.model.fields.atlan_fields import AtlanField
Expand Down Expand Up @@ -109,6 +110,15 @@ def traverse_lineage(
)
return {"assets": results_list, "error": None}

except NotFoundError:
logger.info(
f"No lineage found for asset {guid} (404 from lineage API)"
)
return {
"assets": [],
"error": None,
"message": "No lineage found for this asset. It may not have upstream or downstream connections in the catalog.",
}
except Exception as e:
logger.error(f"Error traversing lineage: {str(e)}")
return {"assets": [], "error": str(e)}
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