diff --git a/cloudflare/internal/cfruntimecontext/cfruntimecontext.go b/cloudflare/internal/cfruntimecontext/cfruntimecontext.go
index cbc2228..69d076f 100644
--- a/cloudflare/internal/cfruntimecontext/cfruntimecontext.go
+++ b/cloudflare/internal/cfruntimecontext/cfruntimecontext.go
@@ -2,6 +2,7 @@ package cfruntimecontext
 
 import (
 	"context"
+	"errors"
 	"syscall/js"
 
 	"github.com/syumai/workers/internal/runtimecontext"
@@ -13,6 +14,7 @@ import (
  *  type RuntimeContext {
  *    env: Env;
  *    ctx: ExecutionContext;
+ *    ...
  *  }
  *  ```
  * This type is based on the type definition of ExportedHandlerFetchHandler.
@@ -33,3 +35,16 @@ func GetExecutionContext(ctx context.Context) js.Value {
 	runtimeCtxValue := runtimecontext.MustExtract(ctx)
 	return runtimeCtxValue.Get("ctx")
 }
+
+var ErrValueNotFound = errors.New("execution context value for specified key not found")
+
+// GetRuntimeContextValue gets value for specified key from RuntimeContext.
+// - if the value is undefined, return error.
+func GetRuntimeContextValue(ctx context.Context, key string) (js.Value, error) {
+	runtimeCtxValue := runtimecontext.MustExtract(ctx)
+	v := runtimeCtxValue.Get(key)
+	if v.IsUndefined() {
+		return js.Value{}, ErrValueNotFound
+	}
+	return v, nil
+}
diff --git a/cmd/workers-assets-gen/assets/common/shim.mjs b/cmd/workers-assets-gen/assets/common/shim.mjs
index 741c70d..4d6ad60 100644
--- a/cmd/workers-assets-gen/assets/common/shim.mjs
+++ b/cmd/workers-assets-gen/assets/common/shim.mjs
@@ -1,5 +1,6 @@
 import "./polyfill_performance.js";
 import "./wasm_exec.js";
+import { connect } from 'cloudflare:sockets';
 
 const go = new Go();
 
@@ -18,19 +19,27 @@ async function run() {
   await readyPromise;
 }
 
+function createRuntimeContext(env, ctx) {
+  return {
+    env,
+    ctx,
+    connect,
+  }
+}
+
 export async function fetch(req, env, ctx) {
   await run();
-  return handleRequest(req, { env, ctx });
+  return handleRequest(req, createRuntimeContext(env, ctx));
 }
 
 export async function scheduled(event, env, ctx) {
   await run();
-  return runScheduler(event, { env, ctx });
+  return runScheduler(event, createRuntimeContext(env, ctx));
 }
 
 // onRequest handles request to Cloudflare Pages
 export async function onRequest(ctx) {
   await run();
   const { request, env } = ctx;
-  return handleRequest(request, { env, ctx });
+  return handleRequest(request, createRuntimeContext(env, ctx));
 }
\ No newline at end of file