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Allow CallToolResult to be returned directly to support _meta field for OpenAI Apps (#1459)

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Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>
This commit is contained in:
Brandon Shar 2025-10-21 14:52:08 -04:00 • committed by GitHub
commit 1200ba0082
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1 changed files with 445 additions and 5 deletions
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6
src/mcp/server/lowlevel/server.py
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@ -480,7 +480,7 @@ class Server(Generic[LifespanResultT, RequestT]):
def decorator(
func: Callable[
...,
Awaitable[UnstructuredContent | StructuredContent | CombinationContent],
Awaitable[UnstructuredContent | StructuredContent | CombinationContent | types.CallToolResult],
],
):
logger.debug("Registering handler for CallToolRequest")
@ -504,7 +504,9 @@ class Server(Generic[LifespanResultT, RequestT]):
# output normalization
unstructured_content: UnstructuredContent
maybe_structured_content: StructuredContent | None
if isinstance(results, tuple) and len(results) == 2:
if isinstance(results, types.CallToolResult):
return types.ServerResult(results)
elif isinstance(results, tuple) and len(results) == 2:
# tool returned both structured and unstructured content
unstructured_content, maybe_structured_content = cast(CombinationContent, results)
elif isinstance(results, dict):