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fix: add list coercion for direction/include_attributes in traverse_lineage_tool #217

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fix: add list coercion for direction/include_attributes in traverse_lineage_tool #217

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16 changes: 15 additions & 1 deletion modelcontextprotocol/server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -452,13 +452,27 @@ def traverse_lineage_tool(
size=10
)
"""
# Coerce direction from list to string (LLMs often pass ["upstream"] instead of "upstream")
if isinstance(direction, list):
if len(direction) == 1:
direction = direction[0]
else:
raise ValueError(
"direction must be a single string: 'UPSTREAM', 'DOWNSTREAM', or 'BOTH'. "
f"Got multiple values: {direction}"
)

try:
direction_enum = LineageDirection[direction.upper()]
except KeyError:
except (KeyError, AttributeError):
raise ValueError(
f"Invalid direction: {direction}. Must be either 'UPSTREAM' or 'DOWNSTREAM'"
)

# Coerce include_attributes from string to list (LLMs may pass a single string instead of a list)
if isinstance(include_attributes, str):
include_attributes = parse_list_parameter(include_attributes)

# Parse include_attributes parameter if provided
parsed_include_attributes = parse_list_parameter(include_attributes)

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