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Document pydantic.ValidationError in client Raises sections #3036

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maxisbey merged 1 commit into from
Jun 30, 2026
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Document pydantic.ValidationError in client Raises sections #3036

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6 changes: 6 additions & 0 deletions src/mcp/client/client.py
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Original file line number Diff line number Diff line change
Expand Up @@ -629,6 +629,8 @@ async def read_resource(
Raises:
InputRequiredRoundsExceededError: `input_required_max_rounds` exhausted.
MCPError: A callback returned `ErrorData` for an embedded input request.
pydantic.ValidationError: The server returned a result that does not
conform to the negotiated protocol version.
"""

async def retry(r: InputResponses | None, s: str | None) -> ReadResourceResult | InputRequiredResult:
Expand Down Expand Up @@ -711,6 +713,8 @@ async def call_tool(
Raises:
InputRequiredRoundsExceededError: `input_required_max_rounds` exhausted.
MCPError: A callback returned `ErrorData` for an embedded input request.
pydantic.ValidationError: The server returned a result that does not
conform to the negotiated protocol version.
"""

async def retry(r: InputResponses | None, s: str | None) -> CallToolResult | InputRequiredResult | Result:
Expand Down Expand Up @@ -787,6 +791,8 @@ async def get_prompt(
Raises:
InputRequiredRoundsExceededError: `input_required_max_rounds` exhausted.
MCPError: A callback returned `ErrorData` for an embedded input request.
pydantic.ValidationError: The server returned a result that does not
conform to the negotiated protocol version.
"""

async def retry(r: InputResponses | None, s: str | None) -> GetPromptResult | InputRequiredResult:
Expand Down
2 changes: 2 additions & 0 deletions src/mcp/client/session.py
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Expand Up @@ -452,6 +452,8 @@ async def send_request(
MCPError: Error response, read timeout, or connection closed.
RuntimeError: Called before entering the context manager.
ValueError: The request declares `name_param` but its params carry no string name.
pydantic.ValidationError: The server returned a result that does not
conform to the negotiated protocol version.
"""
data = request.model_dump(by_alias=True, mode="json", exclude_none=True)
method: str = data["method"]
Expand Down
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