refactor(a2a): upper bound deps + remove from multiagent submodule (#447)

Co-authored-by: jer <[email protected]>

Author: jer96

pyproject.toml

@@ -91,10 +91,10 @@ writer = [
 
 a2a = [
     "a2a-sdk[sql]>=0.2.11,<1.0.0",
-    "uvicorn>=0.34.2",
-    "httpx>=0.28.1",
-    "fastapi>=0.115.12",
-    "starlette>=0.46.2",
+    "uvicorn>=0.34.2,<1.0.0",
+    "httpx>=0.28.1,<1.0.0",
+    "fastapi>=0.115.12,<1.0.0",
+    "starlette>=0.46.2,<1.0.0",
 ]
 all = [
     # anthropic
@@ -137,10 +137,10 @@ all = [
 
     # a2a
     "a2a-sdk[sql]>=0.2.11,<1.0.0",
-    "uvicorn>=0.34.2",
-    "httpx>=0.28.1",
-    "fastapi>=0.115.12",
-    "starlette>=0.46.2",
+    "uvicorn>=0.34.2,<1.0.0",
+    "httpx>=0.28.1,<1.0.0",
+    "fastapi>=0.115.12,<1.0.0",
+    "starlette>=0.46.2,<1.0.0",
 ]
 
 [tool.hatch.version]

src/strands/multiagent/__init__.py

@@ -8,12 +8,10 @@
          standardized communication between agents.
 """
 
-from . import a2a
 from .base import MultiAgentBase, MultiAgentResult
 from .graph import GraphBuilder, GraphResult
 
 __all__ = [
-    "a2a",
     "GraphBuilder",
     "GraphResult",
     "MultiAgentBase",

src/strands/multiagent/a2a/__init__.py

@@ -9,6 +9,7 @@
     A2AAgent: A wrapper that adapts a Strands Agent to be A2A-compatible.
 """
 
+from .executor import StrandsA2AExecutor
 from .server import A2AServer
 
-__all__ = ["A2AServer"]
+__all__ = ["A2AServer", "StrandsA2AExecutor"]