build(a2a): add a2a deps and mitigate otel conflict

pyproject.toml

@@ -35,7 +35,6 @@ dependencies = [
     "watchdog>=6.0.0,<7.0.0",
     "opentelemetry-api>=1.30.0,<2.0.0",
     "opentelemetry-sdk>=1.30.0,<2.0.0",
-    "opentelemetry-exporter-otlp-proto-http>=1.30.0,<2.0.0",
 ]
 
 [project.urls]
@@ -78,13 +77,23 @@ ollama = [
 openai = [
     "openai>=1.68.0,<2.0.0",
 ]
+otel = [
+    "opentelemetry-exporter-otlp-proto-http>=1.30.0,<2.0.0",
+]
+a2a = [
+    "a2a-sdk>=0.2.6",
+    "uvicorn>=0.34.2",
+    "httpx>=0.28.1",
+    "fastapi>=0.115.12",
+    "starlette>=0.46.2",
+]
 
 [tool.hatch.version]
 # Tells Hatch to use your version control system (git) to determine the version.
 source = "vcs"
 
 [tool.hatch.envs.hatch-static-analysis]
-features = ["anthropic", "litellm", "llamaapi", "ollama", "openai"]
+features = ["anthropic", "litellm", "llamaapi", "ollama", "openai", "otel"]
 dependencies = [
   "mypy>=1.15.0,<2.0.0",
   "ruff>=0.11.6,<0.12.0",
@@ -107,7 +116,7 @@ lint-fix = [
 ]
 
 [tool.hatch.envs.hatch-test]
-features = ["anthropic", "litellm", "llamaapi", "ollama", "openai"]
+features = ["anthropic", "litellm", "llamaapi", "ollama", "openai", "otel"]
 extra-dependencies = [
     "moto>=5.1.0,<6.0.0",
     "pytest>=8.0.0,<9.0.0",
@@ -123,8 +132,11 @@ extra-args = [
 
 [tool.hatch.envs.dev]
 dev-mode = true
-features = ["dev", "docs", "anthropic", "litellm", "llamaapi", "ollama"]
+features = ["dev", "docs", "anthropic", "litellm", "llamaapi", "ollama", "otel"]
 
+[tool.hatch.envs.a2a]
+dev-mode = true
+features = ["dev", "docs", "anthropic", "litellm", "llamaapi", "ollama", "a2a"]
 
 
 [[tool.hatch.envs.hatch-test.matrix]]

src/strands/telemetry/tracer.py

@@ -14,7 +14,6 @@
 import opentelemetry.trace as trace_api
 from opentelemetry import propagate
 from opentelemetry.baggage.propagation import W3CBaggagePropagator
-from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
 from opentelemetry.propagators.composite import CompositePropagator
 from opentelemetry.sdk.resources import Resource
 from opentelemetry.sdk.trace import TracerProvider as SDKTracerProvider
@@ -30,6 +29,19 @@
 
 logger = logging.getLogger(__name__)
 
+HAS_OTEL_EXPORTER_MODULE = False
+OTEL_EXPORTER_MODULE_ERROR = (
+    "opentelemetry-exporter-otlp-proto-http not detected;"
+    "please install strands-agents with the optional 'otel' target"
+    "otel http exporting is currently DISABLED"
+)
+try:
+    from opentelemetry.exporter.otlp.proto.http.trace_exporter import OTLPSpanExporter
+
+    HAS_OTEL_EXPORTER_MODULE = True
+except ImportError:
+    pass
+
 
 class JSONEncoder(json.JSONEncoder):
     """Custom JSON encoder that handles non-serializable types."""
@@ -181,7 +193,7 @@ def _initialize_tracer(self) -> None:
             self.tracer_provider.add_span_processor(console_processor)
 
         # Add OTLP exporter if endpoint is provided
-        if self.otlp_endpoint and self.tracer_provider:
+        if HAS_OTEL_EXPORTER_MODULE and self.otlp_endpoint and self.tracer_provider:
             try:
                 # Ensure endpoint has the right format
                 endpoint = self.otlp_endpoint
@@ -206,6 +218,8 @@ def _initialize_tracer(self) -> None:
                 logger.info("endpoint=<%s> | OTLP exporter configured with endpoint", endpoint)
             except Exception as e:
                 logger.exception("error=<%s> | Failed to configure OTLP exporter", e)
+        elif self.otlp_endpoint and self.tracer_provider:
+            logger.warning(OTEL_EXPORTER_MODULE_ERROR)
 
         # Set as global tracer provider
         trace_api.set_tracer_provider(self.tracer_provider)
@@ -294,7 +308,7 @@ def _end_span(
         finally:
             span.end()
             # Force flush to ensure spans are exported
-            if self.tracer_provider and hasattr(self.tracer_provider, 'force_flush'):
+            if self.tracer_provider and hasattr(self.tracer_provider, "force_flush"):
                 try:
                     self.tracer_provider.force_flush()
                 except Exception as e:

tests-integ/test_mcp_client.py

@@ -104,8 +104,8 @@ def test_can_reuse_mcp_client():
 
 
 @pytest.mark.skipif(
-    condition=os.environ.get("GITHUB_ACTIONS") == 'true',
-    reason="streamable transport is failing in GitHub actions, debugging if linux compatibility issue"
+    condition=os.environ.get("GITHUB_ACTIONS") == "true",
+    reason="streamable transport is failing in GitHub actions, debugging if linux compatibility issue",
 )
 def test_streamable_http_mcp_client():
     server_thread = threading.Thread(

tests/strands/telemetry/test_tracer.py

@@ -58,7 +58,10 @@ def mock_set_tracer_provider():
 
 @pytest.fixture
 def mock_otlp_exporter():
-    with mock.patch("strands.telemetry.tracer.OTLPSpanExporter") as mock_exporter:
+    with (
+        mock.patch("strands.telemetry.tracer.HAS_OTEL_EXPORTER_MODULE", True),
+        mock.patch("opentelemetry.exporter.otlp.proto.http.trace_exporter.OTLPSpanExporter") as mock_exporter,
+    ):
         yield mock_exporter
 
 
@@ -199,7 +202,11 @@ def test_initialize_tracer_with_otlp(
     mock_resource.create.return_value = mock_resource_instance
 
     # Initialize Tracer
-    Tracer(otlp_endpoint="http://test-endpoint")
+    with (
+        mock.patch("strands.telemetry.tracer.HAS_OTEL_EXPORTER_MODULE", True),
+        mock.patch("strands.telemetry.tracer.OTLPSpanExporter", mock_otlp_exporter),
+    ):
+        Tracer(otlp_endpoint="http://test-endpoint")
 
     # Verify the tracer provider was created with correct resource
     mock_tracer_provider.assert_called_once_with(resource=mock_resource_instance)
@@ -508,7 +515,11 @@ def test_initialize_tracer_with_invalid_otlp_endpoint(
     # This should not raise an exception, but should log an error
 
     # Initialize Tracer
-    Tracer(otlp_endpoint="http://invalid-endpoint")
+    with (
+        mock.patch("strands.telemetry.tracer.HAS_OTEL_EXPORTER_MODULE", True),
+        mock.patch("strands.telemetry.tracer.OTLPSpanExporter", mock_otlp_exporter),
+    ):
+        Tracer(otlp_endpoint="http://invalid-endpoint")
 
     # Verify the tracer provider was created with correct resource
     mock_tracer_provider.assert_called_once_with(resource=mock_resource_instance)