fix(opencode): suppress vertex metadata lookup warning

packages/opencode/src/server/server.ts

@@ -1,4 +1,5 @@
 import "./init-projectors"
+import "@/util/warning"
 
 import { NodeHttpServer } from "@effect/platform-node"
 import * as Log from "@opencode-ai/core/util/log"

packages/opencode/src/session/prompt.ts

@@ -1,5 +1,6 @@
 import path from "path"
 import os from "os"
+import "@/util/warning"
 import { SessionID, MessageID, PartID } from "./schema"
 import { MessageV2 } from "./message-v2"
 import * as Log from "@opencode-ai/core/util/log"

packages/opencode/src/util/warning.ts

@@ -0,0 +1,10 @@
+const emitWarning = process.emitWarning.bind(process)
+
+// Google ADC checks the metadata service during local Vertex authentication.
+// That expected miss should not write directly over the interactive UI.
+process.emitWarning = ((...args: Parameters<typeof process.emitWarning>) => {
+  const type = typeof args[1] === "string" ? args[1] : args[1]?.type
+  const name = type ?? (args[0] instanceof Error ? args[0].name : undefined)
+  if (name === "MetadataLookupWarning") return
+  emitWarning(...args)
+}) as typeof process.emitWarning

packages/opencode/test/util/warning.test.ts

@@ -0,0 +1,13 @@
+import { expect, test } from "bun:test"
+import { Process } from "@/util/process"
+
+test("suppresses metadata lookup warnings without hiding other warnings", async () => {
+  const out = await Process.run([
+    process.execPath,
+    "-e",
+    'await import("./src/util/warning.ts"); process.emitWarning("metadata", "MetadataLookupWarning"); process.emitWarning("visible", "VisibleWarning")',
+  ])
+
+  expect(out.stderr.toString()).not.toContain("MetadataLookupWarning")
+  expect(out.stderr.toString()).toContain("VisibleWarning: visible")
+})