diff --git a/packages/coding-agent/src/core/gateway/runtime.ts b/packages/coding-agent/src/core/gateway/runtime.ts
index 33994f7..0161700 100644
--- a/packages/coding-agent/src/core/gateway/runtime.ts
+++ b/packages/coding-agent/src/core/gateway/runtime.ts
@@ -195,6 +195,10 @@ export class GatewayRuntime {
 
     return new Promise<GatewayMessageResult>((resolve) => {
       managedSession.queue.push({ ...queuedMessage, resolve });
+      this.logSession(
+        managedSession,
+        `queued source=${queuedMessage.request.source ?? "extension"} depth=${managedSession.queue.length}`,
+      );
       this.emitState(managedSession);
       void this.processNext(managedSession);
     });
@@ -274,6 +278,21 @@ export class GatewayRuntime {
     return session ? this.createSnapshot(session) : undefined;
   }
 
+  private summarizeText(text: string, maxLength = 96): string {
+    const singleLine = text.replace(/\s+/g, " ").trim();
+    if (singleLine.length <= maxLength) {
+      return singleLine;
+    }
+    return `${singleLine.slice(0, maxLength)}...`;
+  }
+
+  private logSession(
+    managedSession: ManagedGatewaySession,
+    message: string,
+  ): void {
+    this.log(`[session] session=${managedSession.sessionKey} ${message}`);
+  }
+
   private async getOrLoadExistingSession(
     sessionKey: string,
   ): Promise<ManagedGatewaySession | null> {
@@ -353,6 +372,10 @@ export class GatewayRuntime {
 
     managedSession.processing = true;
     managedSession.lastActiveAt = Date.now();
+    this.logSession(
+      managedSession,
+      `processing source=${queued.request.source ?? "extension"} remaining=${managedSession.queue.length}`,
+    );
     this.emitState(managedSession);
 
     try {
@@ -425,6 +448,7 @@ export class GatewayRuntime {
     switch (event.type) {
       case "turn_start":
         managedSession.lastActiveAt = Date.now();
+        this.logSession(managedSession, "turn_start");
         this.emit(managedSession, {
           type: "turn_start",
           sessionKey: managedSession.sessionKey,
@@ -432,6 +456,7 @@ export class GatewayRuntime {
         return;
       case "turn_end":
         managedSession.lastActiveAt = Date.now();
+        this.logSession(managedSession, "turn_end");
         this.emit(managedSession, {
           type: "turn_end",
           sessionKey: managedSession.sessionKey,
@@ -476,6 +501,10 @@ export class GatewayRuntime {
         managedSession.lastActiveAt = Date.now();
         if (event.message.role === "assistant") {
           managedSession.activeAssistantMessage = null;
+          this.logSession(
+            managedSession,
+            `assistant_complete text="${this.summarizeText(extractMessageText(event.message))}"`,
+          );
           this.emit(managedSession, {
             type: "message_complete",
             sessionKey: managedSession.sessionKey,
@@ -499,6 +528,10 @@ export class GatewayRuntime {
         return;
       case "tool_execution_start":
         managedSession.lastActiveAt = Date.now();
+        this.logSession(
+          managedSession,
+          `tool_start name=${event.toolName} call=${event.toolCallId}`,
+        );
         this.emit(managedSession, {
           type: "tool_start",
           sessionKey: managedSession.sessionKey,
@@ -531,6 +564,10 @@ export class GatewayRuntime {
             timestamp: Date.now(),
           },
         ];
+        this.logSession(
+          managedSession,
+          `tool_complete name=${event.toolName} call=${event.toolCallId} ok=${!event.isError}`,
+        );
         this.emit(managedSession, {
           type: "tool_complete",
           sessionKey: managedSession.sessionKey,
@@ -656,8 +693,6 @@ export class GatewayRuntime {
       return;
     }
 
-    this.log(`[http] --> ${method} ${path}`);
-
     if (method === "GET" && path === "/ready") {
       this.requireAuth(request, response);
       if (response.writableEnded) return;
@@ -1101,9 +1136,6 @@ export class GatewayRuntime {
     statusCode: number,
     payload: unknown,
   ): void {
-    if (statusCode >= 400) {
-      this.log(`[http] <-- ${statusCode} ${JSON.stringify(payload)}`);
-    }
     response.statusCode = statusCode;
     response.setHeader("content-type", "application/json; charset=utf-8");
     response.end(JSON.stringify(payload));
diff --git a/scripts/bundle-sandbox-builtins.mjs b/scripts/bundle-sandbox-builtins.mjs
new file mode 100644
index 0000000..979ee81
--- /dev/null
+++ b/scripts/bundle-sandbox-builtins.mjs
@@ -0,0 +1,53 @@
+import { mkdir } from "node:fs/promises";
+import path from "node:path";
+import { build } from "esbuild";
+
+const sourceRoot = process.env.PI_BUILTIN_EXTENSIONS_SRC
+  ? path.resolve(process.env.PI_BUILTIN_EXTENSIONS_SRC)
+  : path.resolve(process.cwd(), "packages");
+const outputRoot = process.env.PI_BUILTIN_EXTENSIONS_OUT
+  ? path.resolve(process.env.PI_BUILTIN_EXTENSIONS_OUT)
+  : path.resolve(process.cwd(), ".tmp/builtins");
+
+const entries = [
+  {
+    name: "pi-channels",
+    entry: path.join(sourceRoot, "pi-channels", "src", "index.ts"),
+  },
+  {
+    name: "pi-teams",
+    entry: path.join(sourceRoot, "pi-teams", "extensions", "index.ts"),
+  },
+  {
+    name: "pi-grind",
+    entry: path.join(sourceRoot, "pi-grind", "src", "index.ts"),
+  },
+];
+
+const external = [
+  "@mariozechner/pi-agent-core",
+  "@mariozechner/pi-ai",
+  "@mariozechner/pi-ai/oauth",
+  "@mariozechner/pi-coding-agent",
+  "@mariozechner/pi-tui",
+  "@sinclair/typebox",
+];
+
+await mkdir(outputRoot, { recursive: true });
+
+for (const { name, entry } of entries) {
+  const outdir = path.join(outputRoot, name);
+  await mkdir(outdir, { recursive: true });
+  await build({
+    entryPoints: [entry],
+    outfile: path.join(outdir, "index.js"),
+    bundle: true,
+    format: "esm",
+    platform: "node",
+    target: "node22",
+    sourcemap: false,
+    logLevel: "info",
+    external,
+  });
+  console.log(`Bundled ${name} -> ${path.join(outdir, "index.js")}`);
+}