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feat(a2a): support passing additional keyword arguments to FastAPI and Starlette constructors #1250

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feat(a2a): support passing additional keyword arguments to FastAPI and Starlette constructors #1250

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feat(a2a): allow passing additional keyword arguments to fastapi cons…
snooyen Nov 23, 2025
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feat(a2a): allow passing additional keyword arguments to starlette co…
snooyen Nov 24, 2025
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17 changes: 13 additions & 4 deletions src/strands/multiagent/a2a/server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -176,16 +176,20 @@ def agent_skills(self, skills: list[AgentSkill]) -> None:
"""
self._agent_skills = skills

def to_starlette_app(self) -> Starlette:
def to_starlette_app(self, **kwargs: Any) -> Starlette:
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@zastrowm zastrowm Dec 10, 2025

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In case there's something else we eventually want to pass here, we think it makes more sense to pass this in explicitly as a dictionary that is passed into each app. For instance, something like:

def to_starlette_app(self, *, app_args: dict[str, Any] | None = None):
    ...
    A2AStarletteApplication(...).build(**app_args)
    ...

Naming wise, app_kargs or app_config build_input might make sense, depending on the naming of what build takes.

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@snooyen snooyen Dec 10, 2025 •
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The build methods for A2AFastAPIApplication and A2AStarletteApplication expose **kwargs: Any which is how I arrived at the changes I initially proposed.

Since an explicit dict is requested, I would say app_kwargs sounds okay.

"""Create a Starlette application for serving this agent via HTTP.

Automatically handles path-based mounting if a mount path was derived
from the http_url parameter.

**kwargs: Additional keyword arguments to pass to the Starlette constructor.

Returns:
Starlette: A Starlette application configured to serve this agent.
"""
a2a_app = A2AStarletteApplication(agent_card=self.public_agent_card, http_handler=self.request_handler).build()
a2a_app = A2AStarletteApplication(agent_card=self.public_agent_card, http_handler=self.request_handler).build(
**kwargs
)

if self.mount_path:
# Create parent app and mount the A2A app at the specified path
Expand All @@ -196,16 +200,21 @@ def to_starlette_app(self) -> Starlette:

return a2a_app

def to_fastapi_app(self) -> FastAPI:
def to_fastapi_app(self, **kwargs: Any) -> FastAPI:
"""Create a FastAPI application for serving this agent via HTTP.

Automatically handles path-based mounting if a mount path was derived
from the http_url parameter.

Args:
**kwargs: Additional keyword arguments to pass to the FastAPI constructor.

Returns:
FastAPI: A FastAPI application configured to serve this agent.
"""
a2a_app = A2AFastAPIApplication(agent_card=self.public_agent_card, http_handler=self.request_handler).build()
a2a_app = A2AFastAPIApplication(agent_card=self.public_agent_card, http_handler=self.request_handler).build(
**kwargs
)

if self.mount_path:
# Create parent app and mount the A2A app at the specified path
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