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ref(mcp): Inline _prepare_handler_data() #6758

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247f5d4
ref(mcp): Use middleware when available
alexander-alderman-webb Jul 6, 2026
ebf64d3
ref(mcp): Inline _prepare_handler_data
alexander-alderman-webb Jul 6, 2026
678ec71
Merge branch 'webb/mcp/seperate-handlers' into webb/mcp/use-middleware
alexander-alderman-webb Jul 7, 2026
7b03ff3
Merge branch 'webb/mcp/seperate-handlers' into webb/mcp/use-middleware
alexander-alderman-webb Jul 7, 2026
edee344
Merge branch 'webb/mcp/seperate-handlers' into webb/mcp/use-middleware
alexander-alderman-webb Jul 7, 2026
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116 changes: 43 additions & 73 deletions sentry_sdk/integrations/mcp.py
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Original file line number Diff line number Diff line change
Expand Up @@ -478,50 +478,6 @@ def _extract_handler_data_from_args(
return handler_name, arguments


def _prepare_handler_data(
handler_type: str,
original_args: "tuple[Any, ...]",
original_kwargs: "Optional[dict[str, Any]]" = None,
params: "Optional[Any]" = None,
) -> "tuple[str, dict[str, Any], str, str, str, Optional[str]]":
"""
Prepare common handler data for both v1 and v2 MCP SDK.

Args:
handler_type: "tool", "prompt", or "resource"
original_args: Original positional args (v1 path)
original_kwargs: Original keyword args (v1 path)
params: Typed params object from v2 ServerRequestContext path

Returns:
Tuple of (handler_name, arguments, span_data_key, span_name, mcp_method_name, result_data_key)
"""
if params is not None:
handler_name, arguments = _extract_handler_data_from_params(
handler_type, params
)
elif _is_v2_context(original_args):
handler_name = "unknown"
arguments = {}
else:
handler_name, arguments = _extract_handler_data_from_args(
handler_type, original_args, original_kwargs
)

span_data_key, span_name, mcp_method_name, result_data_key = _get_span_config(
handler_type, handler_name
)

return (
handler_name,
arguments,
span_data_key,
span_name,
mcp_method_name,
result_data_key,
)


async def _tool_handler_wrapper(
func: "Callable[..., Awaitable[Union[CallToolResult, InputRequiredResult]]]",
original_args: "tuple[Any, ...]",
Expand Down Expand Up @@ -551,16 +507,20 @@ async def _tool_handler_wrapper(
and isinstance(original_args[0], ServerRequestContext)
):
ctx = original_args[0]
params = original_args[1] if len(original_args) > 1 else None
if len(original_args) > 1:
params = original_args[1]
handler_name, arguments = _extract_handler_data_from_params("tool", params)
else:
handler_name = "unknown"
arguments = {}
else:
handler_name, arguments = _extract_handler_data_from_args(
"tool", original_args, original_kwargs
)

(
handler_name,
arguments,
span_data_key,
span_name,
mcp_method_name,
result_data_key,
) = _prepare_handler_data("tool", original_args, original_kwargs, params=params)
span_data_key, span_name, mcp_method_name, result_data_key = _get_span_config(
"tool", handler_name
)

# Get request ID, session ID, and transport from context
request_id, session_id, mcp_transport = _get_request_context_data(ctx=ctx)
Expand Down Expand Up @@ -640,23 +600,27 @@ async def _prompt_handler_wrapper(

# Detect v1 vs v2: MCP SDK v2 passes (ServerRequestContext, params) to handlers
ctx: "Optional[Any]" = None
params: "Optional[Any]" = None
if (
ServerRequestContext is not None
and original_args
and isinstance(original_args[0], ServerRequestContext)
):
ctx = original_args[0]
params = original_args[1] if len(original_args) > 1 else None
if len(original_args) > 1:
handler_name, arguments = _extract_handler_data_from_params(
"prompt", original_args[1]
)
else:
handler_name = "unknown"
arguments = {}
else:
handler_name, arguments = _extract_handler_data_from_args(
"prompt", original_args, original_kwargs
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)

(
handler_name,
arguments,
span_data_key,
span_name,
mcp_method_name,
result_data_key,
) = _prepare_handler_data("prompt", original_args, original_kwargs, params=params)
span_data_key, span_name, mcp_method_name, result_data_key = _get_span_config(
"prompt", handler_name
)

# Get request ID, session ID, and transport from context
request_id, session_id, mcp_transport = _get_request_context_data(ctx=ctx)
Expand Down Expand Up @@ -741,16 +705,22 @@ async def _resource_handler_wrapper(
and isinstance(original_args[0], ServerRequestContext)
):
ctx = original_args[0]
params = original_args[1] if len(original_args) > 1 else None

(
handler_name,
arguments,
span_data_key,
span_name,
mcp_method_name,
result_data_key,
) = _prepare_handler_data("resource", original_args, original_kwargs, params=params)
if len(original_args) > 1:
params = original_args[1]
handler_name, arguments = _extract_handler_data_from_params(
"resource", params
)
else:
handler_name = "unknown"
arguments = {}
else:
handler_name, arguments = _extract_handler_data_from_args(
"resource", original_args, original_kwargs
)

span_data_key, span_name, mcp_method_name, result_data_key = _get_span_config(
"resource", handler_name
)

# Get request ID, session ID, and transport from context
request_id, session_id, mcp_transport = _get_request_context_data(ctx=ctx)
Expand Down
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