Add Google ADK agent samples

.github/CODEOWNERS

@@ -5,3 +5,4 @@
 * @temporalio/sdk
 
 /workflowstreams/ @temporalio/sdk @temporalio/ai-sdk
+/googleadk/ @temporalio/sdk @temporalio/ai-sdk

README.md

@@ -165,6 +165,13 @@ with an external configuration file, like TOML, decoupling connection settings f
   reconnecting subscriber, an external publisher, a truncating ticker, and LLM token
   streaming.
 
+- [**Google ADK agent**](./googleadk): Demonstrates running Google ADK (`adk-go`) agents
+  durably using the `googleadk` contrib integration: the agent loop runs in a Workflow, the
+  model call runs as an Activity, and a tool is exposed as a durable Activity via
+  `ActivityAsTool`. Includes scenario subdirectories for a [multi-agent](./googleadk/multiagent)
+  system, [human-in-the-loop](./googleadk/humanintheloop) tool approval (durable wait on a
+  signal), and a [continue-as-new chat](./googleadk/chat).
+
 ### Dynamic Workflow logic examples
 
 These samples demonstrate some common control flow patterns using Temporal's Go SDK API.

go.mod

@@ -21,10 +21,10 @@ require (
 	github.com/stretchr/testify v1.11.1
 	github.com/uber-go/tally/v4 v4.1.7
 	github.com/uber/jaeger-client-go v2.30.0+incompatible
-	go.opentelemetry.io/otel v1.42.0
+	go.opentelemetry.io/otel v1.43.0
 	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.16.0
-	go.opentelemetry.io/otel/sdk v1.42.0
-	go.opentelemetry.io/otel/trace v1.42.0
+	go.opentelemetry.io/otel/sdk v1.43.0
+	go.opentelemetry.io/otel/trace v1.43.0
 	go.temporal.io/api v1.63.0
 	go.temporal.io/sdk v1.46.0
 	go.temporal.io/sdk/contrib/aws/lambdaworker v0.1.1
@@ -33,20 +33,26 @@ require (
 	go.temporal.io/sdk/contrib/aws/s3driver/awssdkv2 v0.2.0
 	go.temporal.io/sdk/contrib/datadog v0.5.0
 	go.temporal.io/sdk/contrib/envconfig v1.0.1
+	go.temporal.io/sdk/contrib/googleadk v0.0.0-00010101000000-000000000000
 	go.temporal.io/sdk/contrib/opentelemetry v0.7.0
 	go.temporal.io/sdk/contrib/opentracing v0.3.0
 	go.temporal.io/sdk/contrib/tally v0.2.0
 	go.temporal.io/sdk/contrib/workflowstreams v0.1.1
 	go.uber.org/multierr v1.11.0
 	go.uber.org/zap v1.27.0
-	google.golang.org/grpc v1.79.3
+	google.golang.org/adk/v2 v2.0.1-0.20260707195420-2a04f92f1776
+	google.golang.org/genai v1.62.0
+	google.golang.org/grpc v1.81.0
 	google.golang.org/protobuf v1.36.11
 	gopkg.in/DataDog/dd-trace-go.v1 v1.59.0
 	gopkg.in/square/go-jose.v2 v2.6.0
 	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
+	cloud.google.com/go v0.123.0 // indirect
+	cloud.google.com/go/auth v0.20.0 // indirect
+	cloud.google.com/go/compute/metadata v0.9.0 // indirect
 	github.com/BurntSushi/toml v1.4.0 // indirect
 	github.com/DataDog/appsec-internal-go v1.4.0 // indirect
 	github.com/DataDog/datadog-agent/comp/core/tagger/origindetection v0.71.0 // indirect
@@ -92,12 +98,20 @@ require (
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/ebitengine/purego v0.8.4 // indirect
 	github.com/facebookgo/clock v0.0.0-20150410010913-600d898af40a // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-ole/go-ole v1.3.0 // indirect
 	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/protobuf v1.5.4 // indirect
+	github.com/google/go-cmp v0.7.0 // indirect
+	github.com/google/jsonschema-go v0.4.2 // indirect
+	github.com/google/s2a-go v0.1.9 // indirect
+	github.com/google/safehtml v0.1.0 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.15 // indirect
+	github.com/googleapis/gax-go/v2 v2.22.0 // indirect
+	github.com/gorilla/websocket v1.5.3 // indirect
 	github.com/grpc-ecosystem/go-grpc-middleware/v2 v2.3.2 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.28.0 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
@@ -144,14 +158,15 @@ require (
 	go.opentelemetry.io/collector/internal/telemetry v0.133.0 // indirect
 	go.opentelemetry.io/collector/pdata v1.39.0 // indirect
 	go.opentelemetry.io/contrib/bridges/otelzap v0.12.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.68.0 // indirect
 	go.opentelemetry.io/contrib/propagators/aws v1.42.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.42.0 // indirect
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.42.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.43.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.42.0 // indirect
-	go.opentelemetry.io/otel/log v0.13.0 // indirect
-	go.opentelemetry.io/otel/metric v1.42.0 // indirect
-	go.opentelemetry.io/otel/sdk/metric v1.42.0 // indirect
-	go.opentelemetry.io/proto/otlp v1.9.0 // indirect
+	go.opentelemetry.io/otel/log v0.19.0 // indirect
+	go.opentelemetry.io/otel/metric v1.43.0 // indirect
+	go.opentelemetry.io/otel/sdk/metric v1.43.0 // indirect
+	go.opentelemetry.io/proto/otlp v1.10.0 // indirect
 	go.shabbyrobe.org/gocovmerge v0.0.0-20230507111327-fa4f82cfbf4d // indirect
 	go.uber.org/atomic v1.11.0 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
@@ -164,11 +179,20 @@ require (
 	golang.org/x/sync v0.20.0 // indirect
 	golang.org/x/sys v0.45.0 // indirect
 	golang.org/x/text v0.37.0 // indirect
-	golang.org/x/time v0.12.0 // indirect
+	golang.org/x/time v0.15.0 // indirect
 	golang.org/x/tools v0.44.0 // indirect
-	golang.org/x/xerrors v0.0.0-20231012003039-104605ab7028 // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20260209200024-4cfbd4190f57 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20260209200024-4cfbd4190f57 // indirect
+	golang.org/x/xerrors v0.0.0-20240903120638-7835f813f4da // indirect
+	google.golang.org/api v0.279.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20260427160629-7cedc36a6bc4 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260511170946-3700d4141b60 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	inet.af/netaddr v0.0.0-20230525184311-b8eac61e914a // indirect
+	rsc.io/omap v1.2.0 // indirect
+	rsc.io/ordered v1.1.1 // indirect
 )
+
+// TEMPORARY (draft): go.temporal.io/sdk/contrib/googleadk is not yet a tagged
+// release, so it is consumed from a local sibling checkout of temporalio/sdk-go.
+// Before this PR is marked ready, drop this replace and pin a real
+// contrib/googleadk/vX.Y.Z release.
+replace go.temporal.io/sdk/contrib/googleadk => ../sdk-go/contrib/googleadk