disable server unless explicitly opted in (#7529)

packages/opencode/src/cli/cmd/tui/thread.ts

@@ -7,11 +7,39 @@ import { UI } from "@/cli/ui"
 import { iife } from "@/util/iife"
 import { Log } from "@/util/log"
 import { withNetworkOptions, resolveNetworkOptions } from "@/cli/network"
+import type { Event } from "@opencode-ai/sdk/v2"
+import type { EventSource } from "./context/sdk"
 
 declare global {
   const OPENCODE_WORKER_PATH: string
 }
 
+type RpcClient = ReturnType<typeof Rpc.client<typeof rpc>>
+
+function createWorkerFetch(client: RpcClient): typeof fetch {
+  const fn = async (input: RequestInfo | URL, init?: RequestInit): Promise<Response> => {
+    const request = new Request(input, init)
+    const body = request.body ? await request.text() : undefined
+    const result = await client.call("fetch", {
+      url: request.url,
+      method: request.method,
+      headers: Object.fromEntries(request.headers.entries()),
+      body,
+    })
+    return new Response(result.body, {
+      status: result.status,
+      headers: result.headers,
+    })
+  }
+  return fn as typeof fetch
+}
+
+function createEventSource(client: RpcClient): EventSource {
+  return {
+    on: (handler) => client.on<Event>("event", handler),
+  }
+}
+
 export const TuiThreadCommand = cmd({
   command: "$0 [project]",
   describe: "start opencode tui",
@@ -80,16 +108,45 @@ export const TuiThreadCommand = cmd({
     process.on("SIGUSR2", async () => {
       await client.call("reload", undefined)
     })
-    const opts = await resolveNetworkOptions(args)
-    const server = await client.call("server", opts)
+
     const prompt = await iife(async () => {
       const piped = !process.stdin.isTTY ? await Bun.stdin.text() : undefined
       if (!args.prompt) return piped
       return piped ? piped + "\n" + args.prompt : args.prompt
     })
 
+    // Check if server should be started (port or hostname explicitly set in CLI or config)
+    const networkOpts = await resolveNetworkOptions(args)
+    const shouldStartServer =
+      process.argv.includes("--port") ||
+      process.argv.includes("--hostname") ||
+      process.argv.includes("--mdns") ||
+      networkOpts.mdns ||
+      networkOpts.port !== 0 ||
+      networkOpts.hostname !== "127.0.0.1"
+
+    // Subscribe to events from worker
+    await client.call("subscribe", { directory: cwd })
+
+    let url: string
+    let customFetch: typeof fetch | undefined
+    let events: EventSource | undefined
+
+    if (shouldStartServer) {
+      // Start HTTP server for external access
+      const server = await client.call("server", networkOpts)
+      url = server.url
+    } else {
+      // Use direct RPC communication (no HTTP)
+      url = "http://opencode.internal"
+      customFetch = createWorkerFetch(client)
+      events = createEventSource(client)
+    }
+
     const tuiPromise = tui({
-      url: server.url,
+      url,
+      fetch: customFetch,
+      events,
       args: {
         continue: args.continue,
         sessionID: args.session,