diff --git a/temporal/api/worker/v1/message.proto b/temporal/api/worker/v1/message.proto
index a87142c78..05c9e5b45 100644
--- a/temporal/api/worker/v1/message.proto
+++ b/temporal/api/worker/v1/message.proto
@@ -130,6 +130,9 @@ message WorkerHeartbeat {
 
   // Storage drivers in use by this SDK.
   repeated StorageDriverInfo drivers = 24;
+
+  // Information about the environment this SDK is running in.
+  EnvironmentInfo environment = 25;
 }
 
 // Detailed worker information.
@@ -194,6 +197,120 @@ message StorageDriverInfo {
   string type = 1;
 }
 
+message EnvironmentInfo {
+  message Runtime {
+    enum RuntimeType {
+      // Should never actually be set, exists to follow convention of having a default.
+      // SDKs should just leave `runtimes` empty if none can be determined.
+      RUNTIME_TYPE_UNSPECIFIED = 0;
+      RUNTIME_TYPE_JVM = 1;
+      RUNTIME_TYPE_CPYTHON = 2;
+      RUNTIME_TYPE_NODE = 3;
+      RUNTIME_TYPE_BUN = 4;
+      RUNTIME_TYPE_CRUBY = 5;
+      RUNTIME_TYPE_GO = 6;
+      RUNTIME_TYPE_DOTNET_FRAMEWORK = 7;
+      RUNTIME_TYPE_DOTNET_CORE = 8;
+      RUNTIME_TYPE_NATIVE = 9;
+      RUNTIME_TYPE_ROADRUNNER = 10;
+    }
+    // The type of the runtime.
+    RuntimeType type = 1;
+    // The version of the runtime, if obtainable.
+    string version = 2;
+  }
+
+  message HostingEnvironment {
+    // What kind of hosting environment we're running in. This list is about what can actually be
+    // detected reliably and is unrelated to what SDKs can actually run in.
+    enum HostingEnvironmentType {
+      // Should never actually be set, exists to follow convention of having a default.
+      // SDKs should just leave `hosting_environments` empty if none can be determined.
+      HOSTING_ENVIRONMENT_TYPE_UNSPECIFIED = 0;
+      // Should always be in the list if we're running inside a docker container
+      HOSTING_ENVIRONMENT_TYPE_DOCKER = 1;
+      // Should always be in the list if we're running inside any k8s environment
+      HOSTING_ENVIRONMENT_TYPE_K8S = 2;
+      // Detect via `AWS_LAMBDA_FUNCTION_NAME`
+      HOSTING_ENVIRONMENT_TYPE_AWS_LAMBDA = 3;
+      // Detect via `ECS_CONTAINER_METADATA_URI_V4` or `ECS_CONTAINER_METADATA_URI`
+      HOSTING_ENVIRONMENT_TYPE_AWS_ECS = 4;
+      // Detect via `K_SERVICE`
+      HOSTING_ENVIRONMENT_TYPE_GOOGLE_CLOUD_RUN = 6;
+      // Detect via `GAE_SERVICE`
+      HOSTING_ENVIRONMENT_TYPE_GOOGLE_APP_ENGINE = 7;
+      // Detect via `WEBSITE_SITE_NAME`
+      HOSTING_ENVIRONMENT_TYPE_AZURE_APP_SERVICE = 8;
+      // Detect via `FUNCTIONS_EXTENSION_VERSION`
+      HOSTING_ENVIRONMENT_TYPE_AZURE_FUNCTIONS = 9;
+      // Detect via `CONTAINER_APP_NAME`
+      HOSTING_ENVIRONMENT_TYPE_AZURE_CONTAINER_APPS = 10;
+    }
+    // The type of hosting environment.
+    HostingEnvironmentType type = 1;
+    // The version of the hosting environment, if obtainable.
+    string version = 2;
+  }
+
+  enum Architecture {
+    ARCHITECTURE_UNSPECIFIED = 0;
+    ARCHITECTURE_AMD64 = 1;
+    ARCHITECTURE_ARM64 = 2;
+  }
+
+  message Platform {
+    oneof variant {
+      LinuxPlatform linux = 1;
+      MacOSPlatform macos = 2;
+      WindowsPlatform windows = 3;
+    }
+  }
+
+  message LinuxPlatform {
+    enum Libc {
+      LIBC_UNSPECIFIED = 0;
+      LIBC_GLIBC = 1;
+      LIBC_MUSL = 2;
+    }
+    // The Linux kernel or distribution version, if obtainable.
+    string version = 1;
+    // The architecture of the worker process.
+    Architecture architecture = 2;
+    // The libc used by the worker process.
+    Libc libc = 3;
+  }
+
+  message MacOSPlatform {
+    // The macOS version, if obtainable.
+    string version = 1;
+    // The architecture of the worker process.
+    Architecture architecture = 2;
+  }
+
+  message WindowsPlatform {
+    enum Crt {
+      CRT_UNSPECIFIED = 0;
+      CRT_UCRT = 1;
+      CRT_MSVCRT = 2;
+      CRT_MINGW = 3;
+      CRT_CYGWIN = 4;
+    }
+    // The Windows version, if obtainable.
+    string version = 1;
+    // The architecture of the worker process.
+    Architecture architecture = 2;
+    // The C runtime used by the worker process, if obtainable.
+    Crt crt = 3;
+  }
+
+  // The runtime(s) the SDK is operating in.
+  repeated Runtime runtimes = 1;
+  // The hosting environment(s) the SDK is operating in. Repeated to allow for layering (ex: Docker inside k8s).
+  repeated HostingEnvironment hosting_environments = 2;
+  // The platform the SDK is operating on.
+  Platform platform = 3;
+}
+
 // A command sent from the server to a worker.
 message WorkerCommand {
   oneof type {