diff --git a/Makefile b/Makefile
index dc8ab5025..d43b05677 100644
--- a/Makefile
+++ b/Makefile
@@ -157,7 +157,7 @@ system-nexus-wit-install:
 
 nex-gen-install:
 	printf $(COLOR) "Install nex-gen if missing..."
-	command -v $(NEX_GEN) >/dev/null || cargo install nex-gen
+	command -v $(NEX_GEN) >/dev/null || cargo install nex-gen --version ^0.1
 
 ##### Clean #####
 clean:
diff --git a/openapi/openapiv2.json b/openapi/openapiv2.json
index 97ff181c9..b62198fae 100644
--- a/openapi/openapiv2.json
+++ b/openapi/openapiv2.json
@@ -10848,6 +10848,102 @@
       },
       "description": "Target a worker polling on a Nexus task queue in a specific namespace."
     },
+    "EnvironmentInfoArchitecture": {
+      "type": "string",
+      "enum": [
+        "ARCHITECTURE_UNSPECIFIED",
+        "ARCHITECTURE_AMD64",
+        "ARCHITECTURE_ARM64"
+      ],
+      "default": "ARCHITECTURE_UNSPECIFIED"
+    },
+    "EnvironmentInfoHostingEnvironment": {
+      "type": "object",
+      "properties": {
+        "type": {
+          "$ref": "#/definitions/HostingEnvironmentHostingEnvironmentType",
+          "description": "The type of hosting environment."
+        },
+        "version": {
+          "type": "string",
+          "description": "The version of the hosting environment, if obtainable."
+        }
+      }
+    },
+    "EnvironmentInfoLinuxPlatform": {
+      "type": "object",
+      "properties": {
+        "version": {
+          "type": "string",
+          "description": "The Linux kernel or distribution version, if obtainable."
+        },
+        "architecture": {
+          "$ref": "#/definitions/EnvironmentInfoArchitecture",
+          "description": "The architecture of the worker process."
+        },
+        "libc": {
+          "$ref": "#/definitions/LinuxPlatformLibc",
+          "description": "The libc used by the worker process."
+        }
+      }
+    },
+    "EnvironmentInfoMacOSPlatform": {
+      "type": "object",
+      "properties": {
+        "version": {
+          "type": "string",
+          "description": "The macOS version, if obtainable."
+        },
+        "architecture": {
+          "$ref": "#/definitions/EnvironmentInfoArchitecture",
+          "description": "The architecture of the worker process."
+        }
+      }
+    },
+    "EnvironmentInfoPlatform": {
+      "type": "object",
+      "properties": {
+        "linux": {
+          "$ref": "#/definitions/EnvironmentInfoLinuxPlatform"
+        },
+        "macos": {
+          "$ref": "#/definitions/EnvironmentInfoMacOSPlatform"
+        },
+        "windows": {
+          "$ref": "#/definitions/EnvironmentInfoWindowsPlatform"
+        }
+      }
+    },
+    "EnvironmentInfoRuntime": {
+      "type": "object",
+      "properties": {
+        "type": {
+          "$ref": "#/definitions/RuntimeRuntimeType",
+          "description": "The type of the runtime."
+        },
+        "version": {
+          "type": "string",
+          "description": "The version of the runtime, if obtainable."
+        }
+      }
+    },
+    "EnvironmentInfoWindowsPlatform": {
+      "type": "object",
+      "properties": {
+        "version": {
+          "type": "string",
+          "description": "The Windows version, if obtainable."
+        },
+        "architecture": {
+          "$ref": "#/definitions/EnvironmentInfoArchitecture",
+          "description": "The architecture of the worker process."
+        },
+        "crt": {
+          "$ref": "#/definitions/WindowsPlatformCrt",
+          "description": "The C runtime used by the worker process, if obtainable."
+        }
+      }
+    },
     "EventGroupMarkerInboundEvent": {
       "type": "object",
       "properties": {
@@ -10867,6 +10963,23 @@
       },
       "description": "The identifier of an inbound Update (request.meta.update_id)\nwhose handler triggered implicit creation of this group Marker.\n\nUsed in place of `inbound_event_id` for Updates because the event ID of the\nUpdateAccepted history event is not known until the Workflow Task is\ncompleted and recorded by the server, which may be too late."
     },
+    "HostingEnvironmentHostingEnvironmentType": {
+      "type": "string",
+      "enum": [
+        "HOSTING_ENVIRONMENT_TYPE_UNSPECIFIED",
+        "HOSTING_ENVIRONMENT_TYPE_DOCKER",
+        "HOSTING_ENVIRONMENT_TYPE_K8S",
+        "HOSTING_ENVIRONMENT_TYPE_AWS_LAMBDA",
+        "HOSTING_ENVIRONMENT_TYPE_AWS_ECS",
+        "HOSTING_ENVIRONMENT_TYPE_GOOGLE_CLOUD_RUN",
+        "HOSTING_ENVIRONMENT_TYPE_GOOGLE_APP_ENGINE",
+        "HOSTING_ENVIRONMENT_TYPE_AZURE_APP_SERVICE",
+        "HOSTING_ENVIRONMENT_TYPE_AZURE_FUNCTIONS",
+        "HOSTING_ENVIRONMENT_TYPE_AZURE_CONTAINER_APPS"
+      ],
+      "default": "HOSTING_ENVIRONMENT_TYPE_UNSPECIFIED",
+      "description": "What kind of hosting environment we're running in. This list is about what can actually be\ndetected reliably and is unrelated to what SDKs can actually run in.\n\n - HOSTING_ENVIRONMENT_TYPE_UNSPECIFIED: Should never actually be set, exists to follow convention of having a default.\nSDKs should just leave `hosting_environments` empty if none can be determined.\n - HOSTING_ENVIRONMENT_TYPE_DOCKER: Should always be in the list if we're running inside a docker container\n - HOSTING_ENVIRONMENT_TYPE_K8S: Should always be in the list if we're running inside any k8s environment\n - HOSTING_ENVIRONMENT_TYPE_AWS_LAMBDA: Detect via `AWS_LAMBDA_FUNCTION_NAME`\n - HOSTING_ENVIRONMENT_TYPE_AWS_ECS: Detect via `ECS_CONTAINER_METADATA_URI_V4` or `ECS_CONTAINER_METADATA_URI`\n - HOSTING_ENVIRONMENT_TYPE_GOOGLE_CLOUD_RUN: Detect via `K_SERVICE`\n - HOSTING_ENVIRONMENT_TYPE_GOOGLE_APP_ENGINE: Detect via `GAE_SERVICE`\n - HOSTING_ENVIRONMENT_TYPE_AZURE_APP_SERVICE: Detect via `WEBSITE_SITE_NAME`\n - HOSTING_ENVIRONMENT_TYPE_AZURE_FUNCTIONS: Detect via `FUNCTIONS_EXTENSION_VERSION`\n - HOSTING_ENVIRONMENT_TYPE_AZURE_CONTAINER_APPS: Detect via `CONTAINER_APP_NAME`"
+    },
     "LinkActivity": {
       "type": "object",
       "properties": {
@@ -10944,6 +11057,15 @@
         }
       }
     },
+    "LinuxPlatformLibc": {
+      "type": "string",
+      "enum": [
+        "LIBC_UNSPECIFIED",
+        "LIBC_GLIBC",
+        "LIBC_MUSL"
+      ],
+      "default": "LIBC_UNSPECIFIED"
+    },
     "ListWorkerDeploymentsResponseWorkerDeploymentSummary": {
       "type": "object",
       "properties": {
@@ -11099,6 +11221,24 @@
       },
       "description": "UpdateWorkflowOptions represents updating workflow execution options after a workflow reset.\nKeep the parameters in sync with temporal.api.workflowservice.v1.UpdateWorkflowExecutionOptionsRequest."
     },
+    "RuntimeRuntimeType": {
+      "type": "string",
+      "enum": [
+        "RUNTIME_TYPE_UNSPECIFIED",
+        "RUNTIME_TYPE_JVM",
+        "RUNTIME_TYPE_CPYTHON",
+        "RUNTIME_TYPE_NODE",
+        "RUNTIME_TYPE_BUN",
+        "RUNTIME_TYPE_CRUBY",
+        "RUNTIME_TYPE_GO",
+        "RUNTIME_TYPE_DOTNET_FRAMEWORK",
+        "RUNTIME_TYPE_DOTNET_CORE",
+        "RUNTIME_TYPE_NATIVE",
+        "RUNTIME_TYPE_ROADRUNNER"
+      ],
+      "default": "RUNTIME_TYPE_UNSPECIFIED",
+      "description": " - RUNTIME_TYPE_UNSPECIFIED: Should never actually be set, exists to follow convention of having a default.\nSDKs should just leave `runtimes` empty if none can be determined."
+    },
     "UpdateTaskQueueConfigRequestRateLimitUpdate": {
       "type": "object",
       "properties": {
@@ -11144,6 +11284,17 @@
       "default": "PINNED_OVERRIDE_BEHAVIOR_UNSPECIFIED",
       "description": " - PINNED_OVERRIDE_BEHAVIOR_UNSPECIFIED: Unspecified.\n - PINNED_OVERRIDE_BEHAVIOR_PINNED: Override workflow behavior to be Pinned."
     },
+    "WindowsPlatformCrt": {
+      "type": "string",
+      "enum": [
+        "CRT_UNSPECIFIED",
+        "CRT_UCRT",
+        "CRT_MSVCRT",
+        "CRT_MINGW",
+        "CRT_CYGWIN"
+      ],
+      "default": "CRT_UNSPECIFIED"
+    },
     "WorkerConfigAutoscalingPollerBehavior": {
       "type": "object",
       "properties": {
@@ -15599,6 +15750,31 @@
       },
       "description": "Target to route requests to."
     },
+    "v1EnvironmentInfo": {
+      "type": "object",
+      "properties": {
+        "runtimes": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/EnvironmentInfoRuntime"
+          },
+          "description": "The runtime(s) the SDK is operating in."
+        },
+        "hostingEnvironments": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "$ref": "#/definitions/EnvironmentInfoHostingEnvironment"
+          },
+          "description": "The hosting environment(s) the SDK is operating in. Repeated to allow for layering (ex: Docker inside k8s)."
+        },
+        "platform": {
+          "$ref": "#/definitions/EnvironmentInfoPlatform",
+          "description": "The platform the SDK is operating on."
+        }
+      }
+    },
     "v1EventGroupMarker": {
       "type": "object",
       "properties": {
@@ -20673,6 +20849,10 @@
             "$ref": "#/definitions/v1StorageDriverInfo"
           },
           "description": "Storage drivers in use by this SDK."
+        },
+        "environment": {
+          "$ref": "#/definitions/v1EnvironmentInfo",
+          "description": "Information about the environment this SDK is running in."
         }
       },
       "description": "Worker info message, contains information about the worker and its current state.\nAll information is provided by the worker itself."
diff --git a/openapi/openapiv3.yaml b/openapi/openapiv3.yaml
index f2081bd9b..5cdd0727f 100644
--- a/openapi/openapiv3.yaml
+++ b/openapi/openapiv3.yaml
@@ -12084,6 +12084,135 @@ components:
           type: string
           description: Nexus task queue to route requests to.
       description: Target a worker polling on a Nexus task queue in a specific namespace.
+    EnvironmentInfo:
+      type: object
+      properties:
+        runtimes:
+          type: array
+          items:
+            $ref: '#/components/schemas/EnvironmentInfo_Runtime'
+          description: The runtime(s) the SDK is operating in.
+        hostingEnvironments:
+          type: array
+          items:
+            $ref: '#/components/schemas/EnvironmentInfo_HostingEnvironment'
+          description: 'The hosting environment(s) the SDK is operating in. Repeated to allow for layering (ex: Docker inside k8s).'
+        platform:
+          allOf:
+            - $ref: '#/components/schemas/EnvironmentInfo_Platform'
+          description: The platform the SDK is operating on.
+    EnvironmentInfo_HostingEnvironment:
+      type: object
+      properties:
+        type:
+          enum:
+            - HOSTING_ENVIRONMENT_TYPE_UNSPECIFIED
+            - HOSTING_ENVIRONMENT_TYPE_DOCKER
+            - HOSTING_ENVIRONMENT_TYPE_K8S
+            - HOSTING_ENVIRONMENT_TYPE_AWS_LAMBDA
+            - HOSTING_ENVIRONMENT_TYPE_AWS_ECS
+            - HOSTING_ENVIRONMENT_TYPE_GOOGLE_CLOUD_RUN
+            - HOSTING_ENVIRONMENT_TYPE_GOOGLE_APP_ENGINE
+            - HOSTING_ENVIRONMENT_TYPE_AZURE_APP_SERVICE
+            - HOSTING_ENVIRONMENT_TYPE_AZURE_FUNCTIONS
+            - HOSTING_ENVIRONMENT_TYPE_AZURE_CONTAINER_APPS
+          type: string
+          description: The type of hosting environment.
+          format: enum
+        version:
+          type: string
+          description: The version of the hosting environment, if obtainable.
+    EnvironmentInfo_LinuxPlatform:
+      type: object
+      properties:
+        version:
+          type: string
+          description: The Linux kernel or distribution version, if obtainable.
+        architecture:
+          enum:
+            - ARCHITECTURE_UNSPECIFIED
+            - ARCHITECTURE_AMD64
+            - ARCHITECTURE_ARM64
+          type: string
+          description: The architecture of the worker process.
+          format: enum
+        libc:
+          enum:
+            - LIBC_UNSPECIFIED
+            - LIBC_GLIBC
+            - LIBC_MUSL
+          type: string
+          description: The libc used by the worker process.
+          format: enum
+    EnvironmentInfo_MacOSPlatform:
+      type: object
+      properties:
+        version:
+          type: string
+          description: The macOS version, if obtainable.
+        architecture:
+          enum:
+            - ARCHITECTURE_UNSPECIFIED
+            - ARCHITECTURE_AMD64
+            - ARCHITECTURE_ARM64
+          type: string
+          description: The architecture of the worker process.
+          format: enum
+    EnvironmentInfo_Platform:
+      type: object
+      properties:
+        linux:
+          $ref: '#/components/schemas/EnvironmentInfo_LinuxPlatform'
+        macos:
+          $ref: '#/components/schemas/EnvironmentInfo_MacOSPlatform'
+        windows:
+          $ref: '#/components/schemas/EnvironmentInfo_WindowsPlatform'
+    EnvironmentInfo_Runtime:
+      type: object
+      properties:
+        type:
+          enum:
+            - RUNTIME_TYPE_UNSPECIFIED
+            - RUNTIME_TYPE_JVM
+            - RUNTIME_TYPE_CPYTHON
+            - RUNTIME_TYPE_NODE
+            - RUNTIME_TYPE_BUN
+            - RUNTIME_TYPE_CRUBY
+            - RUNTIME_TYPE_GO
+            - RUNTIME_TYPE_DOTNET_FRAMEWORK
+            - RUNTIME_TYPE_DOTNET_CORE
+            - RUNTIME_TYPE_NATIVE
+            - RUNTIME_TYPE_ROADRUNNER
+          type: string
+          description: The type of the runtime.
+          format: enum
+        version:
+          type: string
+          description: The version of the runtime, if obtainable.
+    EnvironmentInfo_WindowsPlatform:
+      type: object
+      properties:
+        version:
+          type: string
+          description: The Windows version, if obtainable.
+        architecture:
+          enum:
+            - ARCHITECTURE_UNSPECIFIED
+            - ARCHITECTURE_AMD64
+            - ARCHITECTURE_ARM64
+          type: string
+          description: The architecture of the worker process.
+          format: enum
+        crt:
+          enum:
+            - CRT_UNSPECIFIED
+            - CRT_UCRT
+            - CRT_MSVCRT
+            - CRT_MINGW
+            - CRT_CYGWIN
+          type: string
+          description: The C runtime used by the worker process, if obtainable.
+          format: enum
     EventGroupMarker:
       type: object
       properties:
@@ -19111,6 +19240,10 @@ components:
           items:
             $ref: '#/components/schemas/StorageDriverInfo'
           description: Storage drivers in use by this SDK.
+        environment:
+          allOf:
+            - $ref: '#/components/schemas/EnvironmentInfo'
+          description: Information about the environment this SDK is running in.
       description: |-
         Worker info message, contains information about the worker and its current state.
          All information is provided by the worker itself.
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 {