diff --git a/apps/desktop/src/main/acp-host.mjs b/apps/desktop/src/main/acp-host.mjs
index e2aefbe0..5a96915b 100644
--- a/apps/desktop/src/main/acp-host.mjs
+++ b/apps/desktop/src/main/acp-host.mjs
@@ -10,6 +10,7 @@ import { ClientSideConnection, ndJsonStream, PROTOCOL_VERSION, RequestError } fr
 import { waitForChildProcessSpawn } from "./child-process-start.mjs";
 import { createAcpAdapterManager } from "./acp-adapter-manager.mjs";
 import { startAcpMcpBridge } from "./acp-mcp-bridge.mjs";
+import { withAntigravityMacProxy } from "./antigravity-proxy.mjs";
 
 const ADAPTERS = {
   codex: { id: "codex", label: "Codex" },
@@ -687,12 +688,15 @@ export function createAcpHostRuntime(options = {}) {
     ],
   });
 
-  const resolveCommand = (input) => {
-    if (input?.id === "antigravity" && typeof input.path === "string" && input.path.trim()) return resolveAcpCommand(input, commandDeps);
+  const resolveCommand = (input, { prepareProxy = true } = {}) => {
+    const adapt = (resolution) => prepareProxy && input?.id === "antigravity" && resolution.ok
+      ? { ...resolution, command: withAntigravityMacProxy(resolution.command, commandDeps) }
+      : resolution;
+    if (input?.id === "antigravity" && typeof input.path === "string" && input.path.trim()) return adapt(resolveAcpCommand(input, commandDeps));
     if (input?.id === "piAgent" && !localExecutable("pi", resolutionDeps(commandDeps))) return { ok: false, state: "not_installed" };
     const managed = manager?.get(input?.id);
-    if (managed) return { ok: true, command: input?.id === "piAgent" ? withPiPath(managed.command, resolutionDeps(commandDeps)) : managed.command, version: managed.version, managed: true };
-    return resolveAcpCommand(input, commandDeps);
+    if (managed) return adapt({ ok: true, command: input?.id === "piAgent" ? withPiPath(managed.command, resolutionDeps(commandDeps)) : managed.command, version: managed.version, managed: true });
+    return adapt(resolveAcpCommand(input, commandDeps));
   };
 
   const connect = async (command, requestId, emit, signal, authMethodId, mcpServers = []) => {
@@ -754,7 +758,7 @@ export function createAcpHostRuntime(options = {}) {
     listAdapters() {
       return ["codex", "claudeCode", "antigravity", "openClaw", "hermesAgent", "grokBuild", "deepseekHarness", "piAgent", "workbuddyCn", "workbuddyIntl"].map((id) => {
         if (installingIds.has(id)) return { ...adapterShell(id), state: "installing" };
-        const resolved = resolveCommand({ id });
+        const resolved = resolveCommand({ id }, { prepareProxy: false });
         return resolved.ok
           ? { ...adapterShell(id), ...(latestStatus.get(id) ?? { state: "failed", detail: "not_probed" }), ...(resolved.version ? { version: resolved.version, managed: true } : {}), ...(updateFailures.has(id) ? { updateError: updateFailures.get(id) } : {}) }
           : adapterFromResolution(id, resolved);
@@ -769,7 +773,9 @@ export function createAcpHostRuntime(options = {}) {
         const result = await manager.install(id, async (command) => {
           let connected;
           try {
-            connected = await withHandshakeTimeout((signal) => connect(id === "piAgent" ? withPiPath(command, resolutionDeps(commandDeps)) : command, `install-${id}`, () => {}, signal), 90_000);
+            const prepared = id === "piAgent" ? withPiPath(command, resolutionDeps(commandDeps))
+              : id === "antigravity" ? withAntigravityMacProxy(command, commandDeps) : command;
+            connected = await withHandshakeTimeout((signal) => connect(prepared, `install-${id}`, () => {}, signal), 90_000);
             return { ...adapterShell(id), state: "available", promptCapabilities: connected.promptCapabilities };
           } catch (error) {
             return { ...adapterShell(id), ...failureFields(classifyAcpFailure(error)), ...(isAuthRequiredError(error) ? { authMethods: error.authMethods ?? [] } : {}) };
diff --git a/apps/desktop/src/main/acp-host.test.mjs b/apps/desktop/src/main/acp-host.test.mjs
index 5cef68c1..e8808781 100644
--- a/apps/desktop/src/main/acp-host.test.mjs
+++ b/apps/desktop/src/main/acp-host.test.mjs
@@ -580,13 +580,18 @@ describe("ACP stdio session", () => {
       const { spawn } = await import("node:child_process");
       const spawned = [];
       const runtime = createAcpHostRuntime({
+        platform: "darwin",
+        env: {},
+        readProxy: () => "HTTPEnable : 1\nHTTPProxy : 127.0.0.1\nHTTPPort : 10808\nHTTPSEnable : 1\nHTTPSProxy : 127.0.0.1\nHTTPSPort : 10809\nSOCKSEnable : 1",
         spawnImpl(command, args, options) {
-          spawned.push({ command, args, cwd: options.cwd, shell: options.shell });
+          spawned.push({ command, args, cwd: options.cwd, shell: options.shell, httpProxy: options.env?.HTTP_PROXY, httpsProxy: options.env?.HTTPS_PROXY });
           return spawn(command, args, options);
         },
       });
       const probed = await runtime.probeAdapter({ id: "antigravity", path: wrapper });
       expect(spawned[0]?.shell).toBe(false);
+      expect(spawned[0]?.httpProxy).toBe("http://127.0.0.1:10808");
+      expect(spawned[0]?.httpsProxy).toBe("http://127.0.0.1:10809");
       expect(realpathSync(spawned[0]?.command)).toBe(realpathSync(wrapper));
       expect(probed.state).toBe("available");
       expect(probed.promptCapabilities).toEqual({ image: true, embeddedContext: true });
diff --git a/apps/desktop/src/main/antigravity-proxy.mjs b/apps/desktop/src/main/antigravity-proxy.mjs
new file mode 100644
index 00000000..48f2f3c0
--- /dev/null
+++ b/apps/desktop/src/main/antigravity-proxy.mjs
@@ -0,0 +1,39 @@
+import { execFileSync } from "node:child_process";
+
+const PROXY_ENV_KEYS = ["HTTP_PROXY", "http_proxy", "HTTPS_PROXY", "https_proxy", "ALL_PROXY", "all_proxy"];
+
+const proxyUrl = (settings, prefix) => {
+  if (settings[`${prefix}Enable`] !== "1") return null;
+  const host = settings[`${prefix}Proxy`];
+  const port = Number(settings[`${prefix}Port`]);
+  if (!host || !Number.isInteger(port) || port < 1 || port > 65535) return null;
+  const bracketed = host.includes(":") ? `[${host}]` : host;
+  try {
+    const url = new URL(`http://${bracketed}:${port}`);
+    return url.username || url.password || url.pathname !== "/" || url.search || url.hash ? null : url.origin;
+  } catch {
+    return null;
+  }
+};
+
+export function antigravityMacProxyEnv({ platform = process.platform, env = process.env, readProxy = () => execFileSync("/usr/sbin/scutil", ["--proxy"], { encoding: "utf8", timeout: 2_000, maxBuffer: 64 * 1024 }) } = {}) {
+  if (platform !== "darwin" || PROXY_ENV_KEYS.some((key) => env[key])) return null;
+  let output;
+  try { output = readProxy(); } catch { return null; }
+  if (typeof output !== "string") return null;
+  const settings = Object.fromEntries([...output.matchAll(/^\s*(\w+)\s*:\s*([^\r\n]+)\s*$/gm)].map((match) => [match[1], match[2].trim()]));
+  // The Antigravity ACP binary lacks python-socks. An HTTP proxy supplied in
+  // the environment takes precedence over macOS's system SOCKS proxy.
+  if (settings.SOCKSEnable !== "1") return null;
+  const http = proxyUrl(settings, "HTTP");
+  const https = proxyUrl(settings, "HTTPS");
+  if (!http && !https) return null;
+  return { ...(http ? { HTTP_PROXY: http } : {}), ...(https ? { HTTPS_PROXY: https } : {}) };
+}
+
+export function withAntigravityMacProxy(command, options) {
+  const proxyEnv = antigravityMacProxyEnv(options);
+  if (!proxyEnv) return command;
+  const spec = typeof command === "string" ? { command, args: [] } : command;
+  return { ...spec, env: { ...spec.env, ...proxyEnv } };
+}
diff --git a/apps/desktop/src/main/antigravity-proxy.test.mjs b/apps/desktop/src/main/antigravity-proxy.test.mjs
new file mode 100644
index 00000000..c459acbc
--- /dev/null
+++ b/apps/desktop/src/main/antigravity-proxy.test.mjs
@@ -0,0 +1,37 @@
+import { describe, expect, test } from "bun:test";
+import { antigravityMacProxyEnv, withAntigravityMacProxy } from "./antigravity-proxy.mjs";
+
+const systemProxy = `<dictionary> {
+  HTTPEnable : 1
+  HTTPProxy : 127.0.0.1
+  HTTPPort : 10808
+  HTTPSEnable : 1
+  HTTPSProxy : 127.0.0.1
+  HTTPSPort : 10809
+  SOCKSEnable : 1
+  SOCKSProxy : 127.0.0.1
+  SOCKSPort : 10808
+}`;
+
+describe("Antigravity macOS proxy", () => {
+  test("uses the system HTTP endpoints when SOCKS would break the bundled ACP server", () => {
+    const options = { platform: "darwin", env: {}, readProxy: () => systemProxy };
+    expect(antigravityMacProxyEnv(options)).toEqual({
+      HTTP_PROXY: "http://127.0.0.1:10808",
+      HTTPS_PROXY: "http://127.0.0.1:10809",
+    });
+    expect(withAntigravityMacProxy({ command: "/tmp/agy_acp_server.par", args: [] }, options).env).toEqual(antigravityMacProxyEnv(options));
+  });
+
+  test("preserves explicit proxy choices and other platforms", () => {
+    const readProxy = () => systemProxy;
+    expect(antigravityMacProxyEnv({ platform: "darwin", env: { https_proxy: "socks5://localhost:9999" }, readProxy })).toBeNull();
+    expect(antigravityMacProxyEnv({ platform: "linux", env: {}, readProxy })).toBeNull();
+    expect(antigravityMacProxyEnv({ platform: "darwin", env: {}, readProxy: () => systemProxy.replace("SOCKSEnable : 1", "SOCKSEnable : 0") })).toBeNull();
+  });
+
+  test("does not use a SOCKS-only or malformed HTTP proxy", () => {
+    expect(antigravityMacProxyEnv({ platform: "darwin", env: {}, readProxy: () => "SOCKSEnable : 1\nSOCKSProxy : localhost\nSOCKSPort : 1080" })).toBeNull();
+    expect(antigravityMacProxyEnv({ platform: "darwin", env: {}, readProxy: () => systemProxy.replaceAll("127.0.0.1", "user@untrusted.example") })).toBeNull();
+  });
+});
diff --git a/apps/web/src/components/settings/DesktopAcpAgentCard.tsx b/apps/web/src/components/settings/DesktopAcpAgentCard.tsx
index f3cdbf31..9e8a114f 100644
--- a/apps/web/src/components/settings/DesktopAcpAgentCard.tsx
+++ b/apps/web/src/components/settings/DesktopAcpAgentCard.tsx
@@ -9,6 +9,7 @@ import {
   AI_SIDEBAR_ADAPTER_KEY,
   AI_SIDEBAR_ADAPTER_PATH_KEY,
   AI_SIDEBAR_SOURCE_KEY,
+  displayedDesktopAcpAdapter,
   listDesktopAcpAdapters,
   installDesktopAcpAdapter,
   authenticateDesktopAcpAdapter,
@@ -116,10 +117,7 @@ const DesktopAcpAgentCardBody = ({ bridge }: { bridge: boolean }) => {
     };
   }, []);
 
-  const listedCurrent = listed.find((adapter) => adapter.id === adapterId);
-  const shown = listedCurrent?.state === "installing" || (listedCurrent?.managed && (!probed?.managed || listedCurrent.version !== probed.version))
-    ? listedCurrent
-    : probed?.id === adapterId ? probed : listedCurrent;
+  const shown = displayedDesktopAcpAdapter({ id: adapterId, path: adapterPath, listed, probed });
   const status = t(statusKey(shown, probing));
   const tone = getStatusTone({
     probing,
diff --git a/apps/web/src/lib/desktop-acp.test.mjs b/apps/web/src/lib/desktop-acp.test.mjs
new file mode 100644
index 00000000..fcdbe449
--- /dev/null
+++ b/apps/web/src/lib/desktop-acp.test.mjs
@@ -0,0 +1,17 @@
+import { expect, test } from "bun:test";
+import { displayedDesktopAcpAdapter } from "./desktop-acp.ts";
+
+test("a checked custom Antigravity executable takes priority over the managed connector status", () => {
+  const managed = { id: "antigravity", label: "Antigravity", state: "failed", version: "1.2.1", managed: true };
+  const custom = { id: "antigravity", label: "Antigravity", state: "available" };
+  const input = { id: "antigravity", path: "/tmp/agy-acp", listed: [managed], probed: custom };
+  expect(displayedDesktopAcpAdapter(input)).toBe(custom);
+  expect(displayedDesktopAcpAdapter({ ...input, probed: null })).toBeUndefined();
+  expect(displayedDesktopAcpAdapter({ ...input, path: "" })).toBe(managed);
+});
+
+test("a newly installed managed connector takes priority over an older probe", () => {
+  const current = { id: "antigravity", label: "Antigravity", state: "available", version: "1.2.2", managed: true };
+  const previous = { id: "antigravity", label: "Antigravity", state: "failed", version: "1.2.1", managed: true };
+  expect(displayedDesktopAcpAdapter({ id: "antigravity", path: "", listed: [current], probed: previous })).toBe(current);
+});
diff --git a/apps/web/src/lib/desktop-acp.ts b/apps/web/src/lib/desktop-acp.ts
index bd2dbc11..4d71e42b 100644
--- a/apps/web/src/lib/desktop-acp.ts
+++ b/apps/web/src/lib/desktop-acp.ts
@@ -18,6 +18,24 @@ export type DesktopAcpAdapter = {
   authMethods?: Array<{ id: string; name: string }>;
 };
 
+export const displayedDesktopAcpAdapter = ({
+  id,
+  path,
+  listed,
+  probed,
+}: {
+  id: DesktopAcpAdapterId;
+  path: string;
+  listed: DesktopAcpAdapter[];
+  probed: DesktopAcpAdapter | null;
+}): DesktopAcpAdapter | undefined => {
+  const current = listed.find((adapter) => adapter.id === id);
+  const checked = probed?.id === id ? probed : undefined;
+  if (id === "antigravity" && path.trim()) return checked;
+  if (current?.state === "installing" || (current?.managed && (!checked?.managed || current.version !== checked.version))) return current;
+  return checked ?? current;
+};
+
 export type DesktopAcpAttachment = {
   filename: string;
   mediaType: string;
diff --git a/package.json b/package.json
index f8fc751a..d74a2d75 100644
--- a/package.json
+++ b/package.json
@@ -63,7 +63,7 @@
     "release": "bun scripts/release.mjs",
     "publish:stores": "bun scripts/store-delivery.mjs",
     "test:desktop:sidecar": "bun scripts/test-desktop-sidecar.mjs",
-    "test:desktop": "bun test apps/desktop/src/main/account-scope.test.mjs apps/desktop/src/main/app-protocol.test.mjs apps/desktop/src/main/child-process-start.test.mjs apps/desktop/src/main/clipboard-write.test.mjs apps/desktop/src/main/desktop-diagnostics.test.mjs apps/desktop/src/main/desktop-menu.test.mjs apps/desktop/src/main/desktop-update-flow.test.mjs apps/desktop/src/main/diagnostic-log.test.mjs apps/desktop/src/main/file-association.test.mjs apps/desktop/src/main/wechat-chat-archive.test.mjs apps/desktop/src/main/wechat-share-import.test.mjs apps/desktop/src/main/share-extension-registration.test.mjs apps/desktop/src/main/windows-share-menu.test.mjs apps/desktop/src/main/file-permissions.test.mjs apps/desktop/src/main/installation-location.test.mjs apps/desktop/src/main/local-data-reset.test.mjs apps/desktop/src/main/ai-direct.test.mjs apps/desktop/src/main/plugin-public-network.test.mjs apps/desktop/src/main/renderer-recovery.test.mjs apps/desktop/src/main/renderer-hibernate.test.mjs apps/desktop/src/main/renderer-startup-guard.test.mjs apps/desktop/src/main/renderer-storage-migration.test.mjs apps/desktop/src/main/resource-request.test.mjs apps/desktop/src/main/resource-url.test.mjs apps/desktop/src/main/scheduled-task-scheduler.test.mjs apps/desktop/src/main/screenshot-capture.test.mjs apps/desktop/src/main/staged-resource.test.mjs apps/desktop/src/main/staged-resource-alias.test.mjs apps/desktop/src/main/tray-icon.test.mjs apps/desktop/src/main/user-data-directory.test.mjs apps/desktop/src/main/window-open-policy.test.mjs apps/desktop/src/main/window-visibility.test.mjs apps/desktop/src/main/windows-update-trust.test.mjs apps/web/src/lib/api.test.mjs apps/web/src/lib/app-page-path.test.mjs apps/web/src/lib/clipboard.test.mjs apps/web/src/lib/desktop-renderer-ready.test.mjs apps/web/src/lib/desktop-workspace-restore.test.mjs apps/web/src/lib/desktop-repository.test.mjs apps/web/src/lib/desktop-resources.test.mjs apps/web/src/lib/desktop-sync.test.mjs apps/web/src/lib/local-mirror.test.mjs apps/web/src/lib/repository.test.mjs apps/web/src/lib/runtime.test.mjs apps/web/src/lib/screenshot-import.test.mjs apps/web/src/lib/wechat-chat-import.test.mjs apps/web/src/lib/shared-file-import.test.mjs apps/web/src/lib/sync-queue.test.mjs && bun test --cwd apps/desktop src/main/acp-adapter-manager.test.mjs src/main/acp-host.test.mjs src/main/acp-mcp-bridge.test.mjs && bun run test:desktop:sidecar",
+    "test:desktop": "bun test apps/desktop/src/main/account-scope.test.mjs apps/desktop/src/main/app-protocol.test.mjs apps/desktop/src/main/child-process-start.test.mjs apps/desktop/src/main/clipboard-write.test.mjs apps/desktop/src/main/desktop-diagnostics.test.mjs apps/desktop/src/main/desktop-menu.test.mjs apps/desktop/src/main/desktop-update-flow.test.mjs apps/desktop/src/main/diagnostic-log.test.mjs apps/desktop/src/main/file-association.test.mjs apps/desktop/src/main/wechat-chat-archive.test.mjs apps/desktop/src/main/wechat-share-import.test.mjs apps/desktop/src/main/share-extension-registration.test.mjs apps/desktop/src/main/windows-share-menu.test.mjs apps/desktop/src/main/file-permissions.test.mjs apps/desktop/src/main/installation-location.test.mjs apps/desktop/src/main/local-data-reset.test.mjs apps/desktop/src/main/ai-direct.test.mjs apps/desktop/src/main/plugin-public-network.test.mjs apps/desktop/src/main/renderer-recovery.test.mjs apps/desktop/src/main/renderer-hibernate.test.mjs apps/desktop/src/main/renderer-startup-guard.test.mjs apps/desktop/src/main/renderer-storage-migration.test.mjs apps/desktop/src/main/resource-request.test.mjs apps/desktop/src/main/resource-url.test.mjs apps/desktop/src/main/scheduled-task-scheduler.test.mjs apps/desktop/src/main/screenshot-capture.test.mjs apps/desktop/src/main/staged-resource.test.mjs apps/desktop/src/main/staged-resource-alias.test.mjs apps/desktop/src/main/tray-icon.test.mjs apps/desktop/src/main/user-data-directory.test.mjs apps/desktop/src/main/window-open-policy.test.mjs apps/desktop/src/main/window-visibility.test.mjs apps/desktop/src/main/windows-update-trust.test.mjs apps/web/src/lib/api.test.mjs apps/web/src/lib/app-page-path.test.mjs apps/web/src/lib/clipboard.test.mjs apps/web/src/lib/desktop-renderer-ready.test.mjs apps/web/src/lib/desktop-workspace-restore.test.mjs apps/web/src/lib/desktop-repository.test.mjs apps/web/src/lib/desktop-resources.test.mjs apps/web/src/lib/desktop-acp.test.mjs apps/web/src/lib/desktop-sync.test.mjs apps/web/src/lib/local-mirror.test.mjs apps/web/src/lib/repository.test.mjs apps/web/src/lib/runtime.test.mjs apps/web/src/lib/screenshot-import.test.mjs apps/web/src/lib/wechat-chat-import.test.mjs apps/web/src/lib/shared-file-import.test.mjs apps/web/src/lib/sync-queue.test.mjs && bun test --cwd apps/desktop src/main/acp-adapter-manager.test.mjs src/main/acp-host.test.mjs src/main/antigravity-proxy.test.mjs src/main/acp-mcp-bridge.test.mjs && bun run test:desktop:sidecar",
     "verify:desktop-renderer": "bun scripts/verify-desktop-renderer.mjs",
     "verify:renderer-origin-migration": "bun run --cwd apps/desktop verify-origin-migration",
     "verify:desktop-cross-version-startup": "bun scripts/verify-desktop-cross-version-startup.mjs",